Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1996-03-08
1998-12-08
Schwartz, Chris
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
267294, 2671414, F16F 1300, B62D 33067
Patent
active
058458956
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a liquid sealed rubber mount for vibration isolating action and, in particular, to a liquid sealed rubber mount suitable for mounting an operating cabin or cab on a body for preventing the occurrence of vibration.
BACKGROUND OP THE INVENTION
A rubber mount includes a shock absorbing member, e.g., made of rubber, between a vibration source such as a car body and a vibration receiving object such as a cab, for reducing vibration of the cab with a vibration isolating effect. A description will be made at first with respect to a common dump truck with reference to FIG. 1, showing, a general structure of the dump truck on which the cab is mounted. In FIG. 1, brackets 3 and 4 are fixed to a frame 2 of the dump truck 1, on which a floor 6 of the cab 5 is mounted through a vibration isolating mount 10 so as to prevent the vibration from being directly transmitted to the cab 5 from a road surface or the like. FIG. 2 is a partial detail of the part P shown in FIG. 1, in which a case 11 of the vibration isolating mount 10 is fastened to the bracket 4 with bolts 12 and nuts 13. A guide shaft 14 of the vibration isolating mount 10 is then tightened to the floor 6 with a nut 15 so as to mount the cab 5 thereon for preventing the occurrence of vibration.
FIG. 19 is a sectional side view of a conventional liquid sealed mount (e.g., see Japanese utility model laid-open publication No. 64-12946) which is often used in the art as a rubber mount. In the liquid sealed mount 60, a case 61 and a boss 63, having a bolt 62, are joined to each other by the rubber mounting element 64. A rubber diaphragm 65, having an orifice 66 therein, is held on a lower end of the boss 63, the circumference of which is fixed to the case 61. The rubber diaphragm 65 divides the case 61 into a chamber 67 and a chamber 68. A liquid is then sealed in both the chamber 67 and the chamber 68 in communication with each other through the orifice 66. When a vertical vibration load is applied, the relative displacement of the case 61 and the boss 63 occurs while deforming the rubber mounting element 64. At this moment, the liquid 69 moves between the chamber 67 and the chamber 68 through the orifice 66 so that the vibration can be attenuated by the power of the resistance of the liquid passing through the orifice 66.
The attenuation characteristics of such a liquid sealed mount 60, which depend upon the diameter or the passing flow rate of the orifice, are shown in FIG. 22. In that drawing, the solid lines indicate the characteristics of the liquid sealed mount 60, each exhibiting a relationship between frequency and loss factor for an input amplitude of .+-.0.2 mm or .+-.3.0 mm. As shown in FIG. 22, an excellent vibration isolating effect can be obtained in certain frequency ranges across a frequency of 10 Hz, whereas the loss factor values are small in the other frequency ranges, such that resonation is induced with respect to the input vibration, such as the impact vibration of a wide frequency band, with no vibration isolating effect. Further, lateral vibration can occur due to the lack of any lateral attenuation action.
Next, a description will be made with respect to another prior art. FIG. 20 is a sectional side view of a viscous mount (e.g., see Japanese utility model laid-open publication No. 4-101835) which is used as another liquid sealed mount, and FIG. 21 is a sectional view taken on line X--X of FIG. 20. In the viscous mount 70, a case 11 and a guide shaft 14, having a bolt 16 therein, are joined to each other by a rubber mounting element 17 having a hardness Hs of about 70.degree.. A housing 20 containing a liquid sealing chamber is fixed to one end of the case 11, while a damper plate 23 having a rubber stopper element 32 is fastened by a bolt 22 to a lower end of the guide shaft 14 and is held in the liquid sealing chamber in the housing 20. A hole 72 is provided through the damper plate 23, and an injecting port 71 is provided in the liquid sealing chamber housing 20, whereby a high attenuation l
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patent: 5330165 (1994-07-01), van Goubergen
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Hiraki Hikosaburou
Nakada Kuniaki
Kabushiki Kaisha Komatsu Seisakusho
Schwartz Chris
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