Vibration isolation mechanism and method for assembling the vibration isolation unit in this vibration isolation mechanism.

Abstract

[Problem] The present invention addresses the technical problem of providing a novel vibration isolation mechanism and the like capable of exhibiting excellent vibration isolation effects against exciting forces from three axial directions X, Y, and Z even when an exact mass characteristic of a vibration-isolated object, which is an object to be isolated from vibration, is unknown. [Solution] A vibration isolation mechanism according to the present invention comprises: a load vibration isolator that supports a vibration-isolated object; and a vibration isolation unit that is provided in a connection section between a vibratory substrate and the vibration-isolated object. A vibration isolation element body of the vibration isolation unit includes: a vibration isolation block employing a viscoelastic material; a fixed base that is fixed to the vibration isolation block and is connected to the vibratory substrate; and a support bracket that is fixed to the vibration isolation block and is connected to the vibration-isolated object. An installation embodiment of the vibration isolation unit is characterized in that at least three vibration isolation units are disposed in an inclined manner so that an axial center line of the vibration isolation block is convergently directed onto a center-of-gravity line in a vertical direction passing through the center of gravity of the vibration-isolated object.

Description

Technical Field

[0001] The present invention relates to a vibration isolation mechanism suitable for mounting a precise measuring instrument on, for example, a civil engineering construction vehicle in a vibration environment, and a method for assembling a vibration isolation unit in the vibration isolation mechanism. of It relates to a method for assembling a vibration isolation unit in a vibration isolation mechanism.

Background Art

[0002] Automated driving and unmanned operation at dangerous construction sites are progressing, and three-dimensional measurement technologies using light-based three-dimensional point cloud sensing technologies represented by LiDAR have become commonly used. Among them, there are work vehicles that involve intense vibrations that may break the measuring device in some cases, such as crushing rock masses. In recent years, there has been an increasing need to perform three-dimensional measurement with high accuracy while protecting the device from vibrations even in such working environments. For example, there is a demand for the development of a lightweight, small-sized, and easily assembled pedestal (retrofit vibration isolation pedestal) that can be retrofitted to existing civil engineering work vehicles and that can isolate triaxial excitation forces.

[0003] By the way, in designing a vibration isolation pedestal, (1) Lower the natural frequency of the system (isolate vibrations) with respect to the vibration frequency band input from three axes, (2) The vibration isolation object (vibration-isolated body) prepared on the customer side can be mounted as it is or with minimal modification, (3) Demonstrate sufficient vibration isolation performance even when the exact mass characteristics of the vibration-isolated body are unknown, Furthermore, depending on the usage environment, (4) Be compact (especially keep the height as low as possible and not interfere with optical measurement), (5) Have a small number of parts and be easy to assemble, (6) Take measures such as minimizing protrusions to avoid injury and covering the tip of the bolt with a rubber cap, (7) Protect the vibration isolation block formed of a material such as gel from being damaged even when hit by flying stones, etc. must be considered in the design. In particular, since the mass characteristics of the vibration-isolated object, such as the center of gravity and moment of inertia, are often not known in advance, it is necessary to design a vibration isolation mechanism that does not cause unnecessary pitching or bouncing even if the center of gravity of the vibration-isolated object is higher than expected. Furthermore, the target resonant frequency in each axial direction is 20 Hz or lower, and it is necessary to devise a vibration isolation structure that maintains a certain level of vertical rigidity to support the load while not exhibiting unnecessary rigidity against the excitation force. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Utility Model Publication No. 53-96799 [Patent Document 2] Japanese Utility Model Publication No. 55-132493 [Overview of the project] [Problems that the invention aims to solve]

[0005] This invention was made in consideration of the above background, and the technical objective was to develop a vibration isolation method that can satisfy the above-mentioned conditions. In particular, the technical objective was to provide a vibration isolation mechanism that exhibits excellent vibration isolation effects against excitation forces from the three axes X, Y, and Z, even when the exact mass characteristics of the vibration-isolated object are unknown. [Means for solving the problem]

[0006] In other words, the vibration isolation mechanism described in claim 1 is A vibration isolation mechanism for mounting a vibration-damping object on a vibrating substrate in a vibrating environment, which reduces or avoids vibrations. This vibration isolation mechanism includes a load-bearing vibration isolation body that supports the weight of the object to be vibration-isolated, It comprises three or more vibration isolation units provided at the connection point between the vibrating base and the vibration-isolating body, The vibration isolation unit is composed of vibration isolation elements, This vibration isolation element consists of a vibration isolation block to which a viscoelastic material is applied, A fixed base is attached to this vibration isolation block in a fixed state and has a connection function with the vibration base, It is configured to include a support bracket that is fixedly attached to the vibration isolation block and has a connection function with the vibration-isolating body, Furthermore, the mounting configuration of the vibration isolation unit is such that at least three vibration isolation units are inclined and arranged so that the axis of the vibration isolation block is focused toward a vertical line of gravity passing through the center of gravity of the vibration-isolating body. the law of nature, Furthermore, the vibration-damping element is fixed in such a state that it supports the vibration-damped object in an initial load-zero state, where the load of the vibration-damped object has almost no effect on the vibration-damping block. It is characterized by the following:

[0007] Also, claims 2 The vibration isolation mechanism described is as described in the claim 1 In addition to the above requirements, In the mounting configuration of the vibration isolation unit, the convergence point of the axial lines of each vibration isolation block is characterized by being located on a vertical line of gravity that passes through the center of gravity of the vibration-isolating body.

[0008] Also, claims 3 The vibration isolation mechanism described is as described in the claim 1 In addition to the above requirements, In the mounting configuration of the vibration isolation unit, the convergence point of the axial cores of each vibration isolation block is characterized by being the center of gravity of the vibration-isolating object.

[0009] Also, claims 4 The vibration isolation mechanism described is as described in the claim 1 In addition to the above requirements, The vibration isolation unit is characterized in that a semi-enclosure casing is provided on a fixed base or support bracket, and vibration isolation elements are housed within this casing.

[0010] Also, claims 5 The vibration isolation mechanism described is as described in the claim 1 In addition to the above requirements, The vibration damping blocks in the vibration damping unit are configured by combining a pair of the same specifications back-to-back. At both ends of the combined vibration damping blocks, they are fixed to the vibrating base through a fixed base. On the other hand, at the intermediate part of the vibration damping blocks combined back-to-back, an overhanging support bracket is provided, and it is characterized in that it is configured to be fixed to the vibration-damping object through this support bracket.

[0011] Also, the vibration damping mechanism according to claim 6 is a vibration damping mechanism for mounting a vibration-damping object by reducing and avoiding vibration with respect to a vibrating base in a vibration environment, and this vibration damping mechanism includes a load vibration damper that supports the weight of the vibration-damping object, and three or more vibration damping units provided at the connection part between the vibrating base and the vibration-damping object, wherein the load vibration damper supports the vibration-damping object from below, and the vibration damping unit includes a semi-casing-shaped casing part provided on the vibrating base side, and a vibration damping element body provided in the casing part so that its installation position can be adjusted freely, and both axial ends of the vibration damping block constituting the vibration damping element body are fixed in the casing part, and the vibration-damping object is supported by a support bracket provided to protrude from the axial intermediate part, and when supporting the vibration-damping object, the load vibration damper supports the weight of the vibration-damping object, so that almost no load of the vibration-damping object acts on the vibration damping block of the vibration damping element body, and it is characterized in that it supports the vibration-damping object in an initial load zero state. Also, the vibration damping mechanism according to claim

[0012] In addition to the requirements described in claim 7 the vibration damping mechanism described in claim 6 is such that, in addition to the requirements described above, the vibration-damping object is a three-dimensional laser measurement sensor. Furthermore, the vibrating base is characterized by being a self-propelled work vehicle or a base that is directly attached to said work vehicle.

[0013] Also, claims 8 The method for assembling the vibration isolation unit in the vibration isolation mechanism described is: A method for assembling a vibration isolation unit in a vibration isolation mechanism for mounting a vibration-damped object on a vibrating substrate in a vibrating environment, while reducing or avoiding vibrations, The vibration isolation mechanism to which this method is applied comprises a load-bearing vibration isolation body that supports the weight of the vibration-isolated object, and three or more vibration isolation units provided at the connection between the vibration base and the vibration-isolated object, wherein the load-bearing vibration isolation body supports the vibration-isolated object from below. On the other hand, the vibration isolation unit comprises a semi-enclosure casing provided on the vibration base, and a vibration isolation element body provided within the casing so as to be adjustable in its installation position. The vibration isolation element is configured such that the axial ends of the vibration isolation blocks constituting the vibration isolation element are fixed within the casing, and the vibration-isolating object is supported by a support bracket that protrudes from the axial middle portion. Furthermore, when fixing the vibration isolation unit to the vibration-damped body, the load vibration isolation body supports the weight of the vibration-damped body, so that the vibration isolation unit is fixed in an initial load-zero state, with almost no load acting on the vibration isolation block of the vibration isolation element body. The aforementioned problems are then solved by means of the configurations described in each of these claims. [Effects of the Invention]

[0014] First, claim 1, 2 , 3 , 6 , 8According to the described invention, since the system comprises a load-type vibration damper and a vibration damping unit, even if the precise mass characteristics of the object to be damped are unknown, or if the excitation force is unknown, the natural frequency of the system, including the vibration damping mechanism, can be lowered for vibration frequency bands input from three axial directions, thereby minimizing the resonance response magnification. In other words, vibrations in the vertical direction can be damped by the load-type vibration damper and the vibration damping unit, and vibrations in other directions can be damped by the vibration damping unit, thereby achieving excellent vibration damping effects. Furthermore, according to the present invention, since the vibration isolation element is provided in the vibration isolation block in an initial load zero state where the load of the vibration-isolated object acts almost none, it is possible to exhibit excellent vibration isolation effects over a wide vibration frequency range.

[0015] Also, claims 4 or 6 According to the invention described, since the vibration-damping element is housed within a semi-enclosed (semi-closed) casing, damage to the vibration-damping element (vibration-damping block) can be prevented even if flying stones occur during rock drilling, for example.

[0016] Also, claims 5 According to the described invention, the vibration isolation mechanism can be made compact, and in particular, its height can be kept to the lowest possible level. Therefore, the applicability of the vibration isolation mechanism to various devices (equipment) that vibrate can be increased, and measurements can be taken without obstructing the laser beam.

[0017] Also, claims 7 According to the described invention, in a configuration in which a three-dimensional laser measurement sensor is attached as a vibration-damping body to a self-propelled work vehicle (vibrating base) that vibrates, the vibrations transmitted from the vehicle to the three-dimensional laser measurement sensor can be suppressed as much as possible, enabling precise three-dimensional measurement. [Brief explanation of the drawing]

[0018] [Figure 1] This diagram (a) illustrates an example of a civil engineering and construction vehicle (excavator) equipped with precision measuring instruments, to which the vibration isolation mechanism of the present invention is applied, and this is a perspective view (b) illustrating an example configuration in which a vibration isolation unit or vibration isolation mechanism is provided at the connection point between the vibrating base and the object to be vibration isolated (object to be vibration isolated). [Figure 2] The same as above, a plan view (a) and an enlarged explanatory diagram (b) showing the vibration isolation unit viewed from the side. [Figure 3] This is a magnified perspective view showing the vibration isolation mechanism. [Figure 4] (a) is an explanatory diagram schematically showing how the axial lines of at least three vibration isolation units (vibration isolation elements) converge to the center of gravity of the vibration-isolated object, and (b) is an explanatory diagram showing how the axial lines converge and are directed toward the center of gravity line (one example). [Figure 5] Diagram (a) shows an example configuration in which a box-shaped housing is placed over the vibrating base, and the vibration-isolating body is suspended from the inside of the top of this housing by a suspension spring. Diagram (b) shows an example configuration in which the vibration-isolating body is suspended in the same way, but with its top and bottom reversed, so to speak, in an upside-down suspension configuration. [Figure 6] Diagram (a) shows the configuration of the vibration isolation unit in the basic embodiment, namely, a casing formed on the upper part of the fixed base that is fixed to the vibration base side, with the vibration isolation element body housed inside, and Diagram (b) shows a modified example in which a casing formed on the lower part of the support bracket that is fixed to the vibration-isolated body side, with the vibration isolation element body housed inside. [Figure 7] This is an explanatory diagram showing two examples of modifications when the vibration isolation element is composed of a single vibration isolation block. [Modes for carrying out the invention]

[0019] The embodiments for carrying out the present invention are described below as preferred examples, and also include various forms that are modified based on this technical concept. [Examples]

[0020] The vibration isolation mechanism 1 of the present invention, the vibration isolation unit 5 used therein, and the method for mounting the vibration isolation unit in the vibration isolation mechanism will be described in detail below. First, as shown in Figures 1 to 3 as an example, the vibration isolation mechanism 1 is a mechanism for mounting a vibration-damped object 3, which is the object to be vibration-damped, on a vibrating base 2 that is in a vibrating environment, while reducing or avoiding vibrations. This vibration isolation mechanism 1 comprises a load vibration isolation body 4 that supports the weight of the vibration-damped object 3, and three or more vibration isolation units 5 provided at the connection point between the vibrating base 2 and the vibration-damped object 3. The vibration isolation unit 5 is composed of a vibration isolation element 6 (see Figure 2(b)), which is designed to minimize vibrations transmitted from the vibrating base 2 to the vibration-isolated body 3, and comprises a vibration isolation block 60 made of a viscoelastic material such as gel. The vibration isolation element 6 (vibration isolation block 60) is provided at the connection point between the vibrating base 2 and the vibration-isolated body 3, and comprises a fixed base 7 and a support bracket 8, which will be described later. The fixed base 7 is responsible for attaching the vibration isolation block 60 to the vibrating base 2 side, and the support bracket 8 is responsible for attaching the vibration isolation block 60 to the vibration-isolated body 3 side. As an example, the mounting configuration of the vibration isolation unit 5 (vibration isolation element 6) is shown in Figure 4, in which the axial lines L of at least three vibration isolation element 6 are inclined to converge onto the vertical center of gravity line GH that passes through the center of gravity G of the vibration-isolated body 3.

[0021] The following provides a detailed explanation of each component. First, the vibration base 2 is a variety of components that are inevitably subjected to vibration from the outside, or that the vibration base 2 itself vibrates. These include components that are fixed in place while vibrating, components that are directly attached to work machinery or work vehicles, such as excavator A, and are themselves subjected to vibration, or components that are subjected to vibration due to the work environment. The vibration-damping body 3 is provided with respect to the vibration base 2 in a manner that can dampen and insulate the vibration, and the vibration base 2 is equipped with a mount base 21 at an appropriate position. On the other hand, the vibration-damped body 3 can be fitted with measuring equipment that utilizes optical three-dimensional point cloud sensing technology, such as LiDAR. This equipment is supported on a base plate 32 and is equipped with a sensor probe 33 to sense the condition of the workpiece, for example, the state of the cut edge of the rock mass in the case of tunnel construction (see Figure 1(a)). The vibration-damping mechanism 1 of the present invention is applied to protect such a vibration-damped body 3 from the vibrating environment.

[0022] The vibration isolation mechanism 1 first has a load-bearing vibration isolation body 4 placed between the vibrating base 2 and the vibration-isolated body 3 to support the weight of the vibration-isolated body 3 and contribute to vibration isolation in the direction of the load. The load-bearing vibration isolation body 4 is equipped with vibration isolation blocks 41 as substantial members that dampen and isolate vibrations, and appropriate materials (materials) are applied, such as rubber, rubber blocks with built-in springs, or blocks made of viscoelastic materials. Of course, vibration isolation members can be obtained by combining various materials, regardless of whether they are of the same or different type, and this is set appropriately according to the vibration isolation conditions. The shape and dimensions of the vibration isolation blocks 41 can also be set appropriately according to the vibration isolation conditions. In this embodiment, the load-bearing vibration isolation body 4 is, as an example, a frustoconical vibration isolation block 41, as shown in Figure 1. This vibration isolation block 41 is equipped with fixing members at the top and bottom. Specifically, a fixing flange 42 is provided at the bottom (the bottom surface side of the frustoconical shape), while a top bolt 44 is provided at the top (the top surface side of the frustoconical shape) via a top washer 43. A nut 45 is screwed onto this top bolt 44 to secure it. Regarding the distinction between "upper" and "lower," in the above explanation, the side on which the vibration base 2 is installed is referred to as "lower," and the side on which the vibration-isolating body 3 is installed is referred to as "upper." However, this is merely a convenient distinction in the embodiments (basic configuration examples) shown in Figures 1 to 3 above. In other words, in actual installation configurations, the entire device, including the vibration base 2 and vibration-isolating body 3, may be installed upside down compared to the basic configuration example (see Figure 5(b)).

[0023] The load-bearing vibration isolation body 4 is fixedly installed on the mount base 21 of the vibration base 2 as appropriate. For example, since the base plate 32 of the vibration-isolated body 3 is rectangular in plan view, load-bearing vibration isolation bodies 4 are provided in four locations. When fixing the load-bearing vibration isolation body 4, it is fixed to the mount base 21 with bolts and nuts as appropriate on the fixing flange 42 side, and on the top bolt 44 side, a nut 45 is tightened onto the bolt portion that penetrates the base plate 32 of the vibration-isolated body 3 to secure it (fixed via a top washer 43).

[0024] In addition to the load-bearing vibration-damping body 4, the vibration-damping mechanism 1 of the present invention further comprises a vibration-damping unit 5 that contributes to vibration damping in the direction of the load and in other directions, as described above. This vibration-damping unit 5 comprises a vibration-damping element body 6 as a constituent member, and this vibration-damping element body 6 comprises a vibration-damping block 60 that substantially performs the vibration-damping action. The vibration-damping block 60 can be appropriately set to known shapes such as columnar, frustoconical, or barrel-shaped depending on the vibration-damping conditions. In this embodiment, the bottom surfaces (the sides exhibiting a large circular surface) of vibration-damping block pieces 60p, which are formed to exhibit a frustoconical shape and of the same specifications (same shape, same vibration-damping characteristics, same material), are combined back to back, and the overall shape after back to back is formed to exhibit a shape that could be called barrel-shaped (see Figure 2(b)). In this configuration, where two vibration-damping blocks 60 are combined back-to-back, each vibration-damping block 60 is fitted with an appropriate vibration-damping material, such as rubber or a rubber block with a built-in spring (a so-called Eligo-type structure), or a block material made of a viscoelastic material, which is selected appropriately according to the vibration-damping conditions.

[0025] Each frustoconical vibration-damping block piece 60p is provided with a base-side end plate 61 on its top surface (the side exhibiting the small circular shape of the frustoconical form). On the other hand, the bottom surface (the back-to-back side exhibiting the large circular shape of the frustoconical form) is provided with a base-side end plate 62, which, in plan view, is typically elliptical or close to a rhombic shape. The base-side end plate 61 is provided with stud bolts 61b that protrude outward in the axial direction of the vibration-damping block piece 60p. When viewed as a vibration-damping block 60 configured in a back-to-back state, the stud bolts 61b are provided to protrude diagonally upward and diagonally downward, and these are provided on the coaxial line.

[0026] Incidentally, it is preferable to provide a rubber cap CA, for example, on all exposed bolt heads, including the stud bolt 61b, in order to prevent the sharp tip of the bolt from being exposed. Furthermore, each of the base end face plates 62 is provided with bolt holes 62h. Here, since the base end face plates 62 are formed in an elliptical or roughly rhombic shape when viewed from above, the bolt holes 62h are provided at two locations on the long axis of the plate, which is formed in an elongated shape when viewed from above. Reference numerals 62b and 62n in the figure indicate bolts and nuts for attaching the base end face plates 62 to the block fixing portion 81 of the support bracket 8.

[0027] Such vibration isolation blocks 60 are fixed to the mounting base 21 of the vibrating base 2 and the base plate 32 of the vibration-isolated body 3 by a fixed base 7 and a support bracket 8. First, let's explain the fixing base 7 for attaching the vibration isolation block 60 to the vibration base 2. As an example, as shown in Figure 2(b) above, the fixed base 7 comprises a base fixing portion 71 formed along the mount base 21 of the vibrating base 2, a lower block fixing portion 72 formed by bending at a somewhat acute angle to be continuous with the base fixing portion 71, and an upper block fixing portion 73 above it that is approximately parallel to the lower block fixing portion 72 and maintains a constant distance between them, allowing the vibration-damping element body 6 to be held in between. These two block fixing portions (lower block fixing portion 72 and upper block fixing portion 73) are continuously formed by a connecting portion 74. That is, the lower block fixing portion 72 and upper block fixing portion 73 are formed to bend at approximately 90 degrees relative to the connecting portion 74, and the lower block fixing portion 72, the connecting portion 74, and the upper block fixing portion 73 are formed to exhibit a "U" shape in cross-section, and the vibration-damping element body 6 is provided to be housed inside the "U" shaped space (casing portion C, which will be described later). More specifically, in this embodiment, the fixed base 7 consists of a base fixing portion 71, a lower block fixing portion 72, a connecting portion 74, and an upper block fixing portion 73, all formed from the same plate-like material having a certain width dimension, and are formed by bending this plate-like material (starting material) multiple times (so-called integral formation).

[0028] Furthermore, for mounting such a fixed base 7, the base fixing portion 71 first has a base mounting slit 71s formed so as to be continuous in the width direction center (see Figure 1). This base mounting slit 71s is formed to extend partway through the lower block fixing portion 72 with the same width dimension, and the slit formed in the lower block fixing portion 72 is called the lower block mounting slit 72s. In other words, the base mounting slit 71s and the lower block mounting slit 72s are formed as a continuous slit, appearing as a single continuous slit in appearance. Furthermore, the upper block fixing portion 73 also has an upper block mounting slit 73s formed over a certain range from the free end side (lower part) to partway up the upper part (see Figures 1 and 3). The vibration isolation unit 5 (vibration isolation element 6) is attached to the fixed base 7. In this attachment, the vibration isolation element 6 can be fixed to the fixed base 7 by inserting the stud bolts 61b, which are formed to protrude diagonally above and below the vibration isolation element 6 (vibration isolation block 60), into the lower block mounting slit 72s and the upper block mounting slit 73s, and then tightening the nuts 63.

[0029] In this fixed state, the vibration isolation block 60 of the vibration isolation element 6 is installed surrounded by the lower block fixing part 72, the upper block fixing part 73, and the connecting part 74 as described above, and a side panel part 75 is provided to close the side edges of this surrounding space. For this reason, the surrounding space is formed as a semi-enclosed (semi-closed) casing with only the bottom open, and this is referred to as the casing part C. The reason why the bottom of the casing part C is in an open state and the casing part C is formed in a semi-enclosed state is that the support bracket 8 is passed through this opening to reach the vibration-isolated body 3, and the vibration isolation block 60 inside the casing part C is connected to the base plate 32 of the vibration-isolated body 3. In this embodiment, the vibration-damping block 60 of the vibration-damping element 6 is housed within a casing section C formed by a fixed base 7. This configuration is intended to prevent damage to the vibration-damping element 6 (vibration-damping block 60) from flying debris during excavation work, for example. The side panel section 75 may be provided with an inspection notch 75a to make it easier to observe the condition of the vibration-damping block 60 housed in the casing section C, or the side panel section 75 may be made of a transparent material.

[0030] Next, we will describe the support bracket 8 for connecting the vibration isolation element 6 in the vibration isolation unit 5 to the vibration-isolated object 3. The support bracket 8 is provided with a block fixing portion 81 that is sandwiched between two base-side end face plates 62 provided on the base side, because the vibration-damping blocks 60 are provided with their base sides (the bottom side that exhibits a large circle in the frustoconical shape) facing back to back, and a vibration-damped body fixing portion 82 that bends from there in a "V" shape in cross-section and is fixed to match the angle of the base plate 32 of the vibration-damped body 3 (see Figures 2(b) and 3). Specifically, the block fixing portion 81 of the support bracket 8 is fixed by tightening bolts 62b and nuts 62n into a total of four elongated bolt holes 81h, while balancing the bolt holes 62h between the upper plate and the lower plate of the two base-side end face plates 62 by offsetting them, because the base-side end face plates 62 of each vibration-damping block piece 60p of the vibration-damping block 60 are elliptical or roughly rhombic in shape. On the other hand, the vibration-damping body fixing portion 82 is fixed to the base plate 32 of the vibration-damping body 3 by bolts 82b or the like. It is preferable that the bolt holes 82h of the vibration-damping body fixing portion 82 are also formed in an elongated shape, so that the mounting position of the vibration-damping body fixing portion 82 (support bracket 8) to the base plate 32 of the vibration-damping body 3 can be adjusted as appropriate. Furthermore, in this embodiment, it is preferable that the block fixing portion 81 of the support bracket 8 be provided with a temporary fixing slit (not shown) in the center of its width direction. This makes it easier to fine-tune the mounting position of the vibration-damping block 60 of the vibration-damping element body 6, which will be described later, and allows for precise and reliable final positioning during setting.

[0031] As an example, the mounting configuration of the vibration isolation unit 5 (vibration isolation element 6) is shown in Figure 4, in which the axial lines L of at least three vibration isolation element 6 are inclined to converge onto the vertical center of gravity line GH that passes through the center of gravity G of the vibration-isolated body 3, and the vibration base 2 and the vibration-isolated body 3 are connected in this state. By arranging the vibration isolation element 6 of the vibration isolation unit 5 in the inclined manner described above, it exerts a vibration isolation effect against vibrations input from three axial directions: the load direction and other directions. Furthermore, even if the mass characteristics such as the center of gravity position and moment of inertia of the vibration-isolated body 3 are not known in advance, by adjusting the angle of inclination according to the center of gravity G of the vibration-isolated body 3, it becomes possible to isolate vibrations without causing unnecessary pitching, bouncing, or excessive shear deformation of the load vibration isolation body 4, even if the center of gravity position is higher than expected. In particular, by installing the vibration isolation units 5 at the four corners of the vibration isolation mechanism 1, the number of vibration isolation materials needed to withstand the three-dimensional excitation force can be reduced, thus making assembly easier (improving ease of assembly).

[0032] The vibration isolation mechanism 1 of the present invention has the basic structure described above, and by coordinating the load vibration isolation body 4 and the inclined vibration isolation unit 5, vibrations in the direction of the load acting on the object to be vibration isolated 3 can be isolated by the load vibration isolation body 4 and the vibration isolation unit 5, while vibrations in other directions can be isolated by the vibration isolation unit 5. Even in cases where the exact mass characteristics of the object to be vibration isolated 3 are unknown or the excitation force is unknown, the natural frequency of the system including the vibration isolation mechanism 1 can be lowered and the resonance response magnification reduced for vibration frequency bands input from three axes, thereby exhibiting an excellent vibration isolation effect.

[0033] The following describes how to assemble the vibration isolation unit 5 used in this vibration isolation mechanism 1. Here, the vibration isolation element 6 and the support bracket 8 are pre-attached together with bolts and nuts, etc., and are in a pre-assembled, integrated state. In other words, the vibration isolation element 6 has vibration isolation block pieces 60p arranged back-to-back, and the block fixing portion 81 of the support bracket 8 is sandwiched between these opposing vibration isolation block pieces 60p (base-side end face plates 62).

[0034] (I-1) Installation of the vibration base 2 to which the load vibration isolation body 4 is applied and the vibration isolation body 3. First, the load-bearing vibration isolation body 4 is applied to attach the vibration-damped body 3 to the vibration base 2. Here, the load-bearing vibration isolation body 4 appropriately supports the vibration-damped body 3 relative to the vibration base 2 through the elasticity of the vibration isolation block 41. The attachment process itself involves placing the fixing flange 42 against the vibration base 2, and then screwing in appropriate bolts or the like into the female threads formed in the mount base 21 on the vibration base 2 to secure it. On the other hand, for attaching the load-bearing vibration isolation body 4 to the vibration-isolated body 3, the top bolt 44 of the load-bearing vibration isolation body 4 is inserted through the bolt hole 32h formed in the base plate 32 of the vibration-isolated body 3 in an internal fit manner, and then a nut 45 or the like is screwed onto the top bolt 44 protruding from the base plate 32 to secure it (see Figure 6(a)). Note that setting the fixing position of the load-bearing vibration isolation body 4 itself does not require any special position setting, so it is simply tightened with bolts and nuts to fix it in the predetermined position, and this tightening state may be the final tightening state.

[0035] (I-2) Installation of vibration isolation unit 5 (1) (Temporarily fixing the vibration isolation element 6 to the fixed base 7) Next, the vibration isolation unit 5 is attached to the vibration base 2 and the vibration-damped body 3, which are mounted in an integrated state as described above. To do this, the vibration isolation element 6 is first temporarily fixed to the fixed base 7 in a semi-fixed state. As described above, the vibration isolation block 60 of the vibration isolation element 6 is temporarily assembled in such a state that the block fixing portion 81 of the support bracket 8 is sandwiched between each vibration isolation block piece 60p (base-side end face plate 62). Then, the stud bolts 61b that protrude downward (downward in the assembled state of the basic embodiment) from the vibration-damping element 6 are inserted into the lower block mounting slits 72s of the lower block fixing part 72 of the fixed base 7, and the stud bolts 61b that protrude upward (upward in the assembled state) from the vibration-damping element 6 are inserted into the upper block mounting slits 73s of the upper block fixing part 73 of the fixed base 7. Nuts 63 or the like are then screwed onto both of these stud bolts 61b as appropriate, and the vibration-damping element 6 is temporarily fixed to the fixed base 7 (see Figures 1(b) and 3).

[0036] (I-3) Installation of vibration isolation unit 5 (2) In this manner, the vibration isolation unit 5, in which the vibration isolation element 6 is temporarily fixed to the fixed base 7, is provided in four units as an example, and is fixed to the connection between the vibration base 2 and the vibration-isolated body 3. (i) Attachment of the support bracket 8 to the vibration-damping body 3 For example, this involves first attaching the support bracket 8, which is integrated with the vibration isolation element 6, to the vibration-isolating body 3. At this point, the vibration-damped body 3 is already positioned in a floating state (levitating state) a certain distance above the vibrating base 2 due to the action of the load vibration-damping body 4. Therefore, the support bracket 8 is temporarily fixed to the vibration-damped body 3 by positioning it so that the vibration-damped body fixing portion 82 of the support bracket 8 is in contact with the upper end surface of the base plate 32 of the vibration-damped body 3.

[0037] (ii) Attachment of the fixed base 7 to the vibrating base 2 Furthermore, in conjunction with such work, it is preferable to temporarily fasten the fixed base 7 to the vibrating base 2 with bolts and nuts using the base mounting slits 71s of the fixed base 7, and then perform positioning adjustments later before final fixing. Note that the above steps (i) and (ii) can be performed in reverse order. Then, through this installation work (temporary fixing work), the vibration isolation unit 5 is temporarily fixed to the connection point between the vibration base 2 and the vibration-isolated body 3.

[0038] (iii) Adjustment of vibration isolation element 6 (position adjustment) Next, the vibration isolation elements 6 are adjusted (position adjusted). At this time, the position (orientation) of the vibration isolation elements 6 is adjusted so that at least three of the axis lines L (for example, L1, L2, L3, L4) of the four inclined vibration isolation elements 6 (stud bolts 61b) converge toward the center of gravity G of the vibration-isolated body 3, as shown in Figure 4(a) as an example. Of course, the position where the three axis lines L converge does not necessarily have to coincide with the center of gravity G; they may converge to a single point on the center of gravity line GH, which is a vertical line passing through the center of gravity G. Furthermore, even if the three axis lines L do not converge at a single point on the center of gravity line GH, if the three axis lines L converge near a single point on the center of gravity line GH (see, for example, Figure 4(b)) and can sufficiently exhibit practical vibration damping functions, such a configuration is also included in the present invention, and this configuration is also referred to in this specification as "(each axis line L) is directed toward the center of gravity line GH." In addition, it is conceivable that, for example, one or more of the three axis lines L do not strictly intersect the center of gravity line GH (a so-called "torsional position"), and even in such a case, if the desired vibration absorption performance can be exhibited, this case is also included in the state of "(each axis line L) being directed toward the center of gravity line GH."

[0039] (iv) Adjustment of vibration isolation element 6 2 (final adjustment) Furthermore, from the viewpoint of exhibiting excellent vibration isolation effects over a wide vibration frequency range, the vibration isolation element 6 is ultimately fixed in a state in which the load of the vibration-isolated body 3 acts almost on the vibration isolation block 60, in a state that is as close as possible to zero initial load. It is. In other words, the vibration isolation block 60 is fixed in a state that holds the vibration-isolated body 3 in a balanced floating state (static assembly state) that eliminates the load of the vibration-isolated body 3 as much as possible. This state setting is essentially done by using various slits, such as the lower block mounting slit 72s and the upper block mounting slit 73s, which allow the mounting positions of the vibration isolation unit 5 and the vibration isolation block 60 on the fixed base 7 to be freely adjustable. In particular, the installation position of the vibration isolation element 6 that performs the vibration isolation function is selected, and a position that eliminates the load of the vibration-isolated body 3 as much as possible is selected. Once that position is determined, the vibration isolation element 6 and the fixed base 7 and support bracket 8 are finally fixed (tightened) by fixing them with bolts and nuts as appropriate. Furthermore, by fixing the vibration isolation unit 5 with the initial load of the vibration-isolated body 3 as close to zero as possible, vibration isolation is made possible over a wider vibration frequency range. Incidentally, to explain the specific range within which the initial load is brought as close to zero as possible, the deformation amount during installation is within ±10% of the thickness of the vibration isolation element body 6 in the tensile / compressive deformation axis direction in the unloaded state, and this is referred to as the "initial load zero state" in the patent claims. Here, a positive (+) deformation is tensile deformation, and a negative (-) deformation is compressive deformation.

[0040] The vibration isolation mechanism 1, configured as described above, ensures that even when the vibrating base 2 is in an extremely intense vibration environment, the load from the vibration-isolated body 3 itself is absorbed by the load vibration-isolated body 4, and any vibration elements that the load vibration-isolated body 4 cannot absorb are absorbed by the viscoelastic deformation of the vibration-isolated block 60 of the vibration isolation unit 5. As a result, vibrations occurring in the vibration-isolated body 3 can be suppressed as much as possible. In particular, this effect is achieved because at least three of the axial core lines L in the multiple vibration-isolated element bodies 6 are configured to converge and point towards the center of gravity G of the vibration-isolated body 3, or the center of gravity line GH passing through the center of gravity G. This also ensures that the vibration-isolated body 3 is stably supported in a state with excellent vibration isolation or vibration isolation properties.

[0041] [Other examples] The present invention is based on the embodiments described above as one basic technical concept, but further modifications are possible as follows. First, in the basic embodiment described above, since the plan view of the vibration base 2 and the vibration-isolated body 3 is rectangular, the basic configuration is to arrange vibration isolation units 5 at the four corners. That is, in the basic embodiment, the basic configuration is to provide four vibration isolation units 5, or in other words, four axis lines L, but it is sufficient to have three or more vibration isolation units 5, and depending on the size, weight, or vibration isolation characteristics of the vibration-isolated body 3, it is also possible to provide five or more vibration isolation units 5. When four or more vibration isolation units 5 are provided, it is sufficient that at least three of the axis lines L (axis lines L of the vibration isolation element 6 (vibration isolation block 60)) are inclined to be directed toward the vertical center of gravity line GH that passes through the center of gravity G of the vibration-isolated body 3. Furthermore, depending on the shape of the vibration-damped body 3, the center of gravity G, the load balance, etc., the vibration-damping performance and tilt angle of the vibration-damping element 6 may be varied for each vibration-damping unit 5.

[0042] Furthermore, in the basic embodiment described above, when supporting the vibration-damped body 3 with the load vibration-damping body 4, the load vibration-damping body 4 was attached in a manner that supported the vibration-damped body 3 from below the vibrating base 2. However, as shown in Figure 5(a), for example, the fixed base 7, support bracket 8, vibration-damped body 3, etc., can be covered with a box-shaped housing B over the vibrating base 2, and the load vibration-damping body 4 can be provided in a manner that suspends the vibration-damped body 3 from the inside of the top of this housing B (a so-called ceiling-suspended type). In this case, a suspension spring-type load vibration-damping body 4 can be applied. Furthermore, even with the same suspended mounting configuration, the vibration-damping body 3 may be mounted in an inverted manner, for example, as shown in Figure 5(b), by reversing its orientation. Furthermore, when a box-shaped housing B is placed over the vibrating base 2 as described above, and the vibration-damping body 3 etc. is housed inside the housing B, a cushioning material K with cushioning properties may be further provided between the vibrating base 2 and the housing B, as shown in Figure 5(b) above.

[0043] Furthermore, when attaching the vibration-damping body 3 in a stationary assembly state, the entire structure may be made of an airbag-like air suspension, a torsion bar, or a flattened barrel-shaped leaf spring, instead of the four load vibration-damping bodies 4.

[0044] Furthermore, in the basic embodiment described above, as an example, as shown in Figure 6(a), the upper part of the fixed base 7 (the side of the vibration-isolating body 3) is bent into a "U" shape in cross-section, and both sides are closed with side panel parts 75 to form a casing part C, and the vibration-isolating block 60 is housed within this casing part C. However, as shown in Figure 6(b), for example, the lower part of the support bracket 8 (the side of the vibrating base 2) is bent into a "U" shape in cross-section, and a casing part C similar to the above is formed there, and the vibration-isolating block 60 is housed within this casing part C. In other words, the configuration example in Figure 6(b) is a configuration example in which the casing part C is formed integrally with the support bracket 8.

[0045] Furthermore, in the basic embodiment described above, as shown in Figure 6(a), the vibration isolation block 60 is provided with two vibration isolation block pieces 60p arranged back-to-back, and the block fixing portion 81 of the support bracket 8 is provided to extend from the mating surface which is the vertical intermediate position of the vibration isolation block 60. However, the vibration isolation block 60 does not necessarily have to be constructed by combining two vibration isolation block pieces 60p back-to-back. That is, the vibration isolation block 60 may be constructed with a single vibration isolation block piece 60p, as shown in Figure 7 as an example. In this case, for example, in the configuration example in Figure 7(a), the bottom of the vibration isolation block 60 may be fixed to the upper side of the fixed base 7, and the upper end of the vibration isolation block 60 may be fixed to the block fixing portion 81 of the support bracket 8. Alternatively, as shown in Figure 7(b), the upper part of the fixed base 7 may be formed in a "U" shape in cross-section, the upper end of the vibration-damping block 60 may be fixed to the upper part of the fixed base 7 (upper block fixing part 73), and the bottom of the vibration-damping block 60 may be fixed to the block fixing part 81 of the support bracket 8. [Explanation of Symbols]

[0046] 1. Vibration isolation mechanism 2 Vibration base 21 Mounting Base 3. Vibration-isolated object (object to be isolated from vibration) 32 base plate 32h bolt holes 33 Sensor probe 4. Load-bearing vibration isolation body 41 Vibration Isolation Block 42 Fixed flange 43 Top Washer 44 Top bolts 45 nuts 5. Vibration isolation unit 6. Vibration Isolation Element 60 Vibration Isolation Blocks 60p Vibration Isolation Block Piece 61. Top side end plate 61b Stud bolt 62 Base side end face plate 62b Bolt 62n nut 62h Bolt holes 63 Nuts 7 Fixed base 71 Base fixing part 71s Base mounting slit 72 Lower block fixing part 72s Lower block mounting slit 73 Upper block fixing part 73s Upper block mounting slit 74 Connecting part 75 Side panel section 75a Inspection notch 8 support brackets 81 Block fixing part 81h Bolt holes 82 Vibration-damped body fixing part 82b Bolt 82h Bolt holes A. Excavator (civil engineering and construction vehicle) B cabinet C Casing section CA Cap G center of gravity GH center of gravity line K Cushioning material L axis center line

Claims

1. A vibration isolation mechanism for mounting a vibration-damping object on a vibrating substrate in a vibrating environment, which reduces or avoids vibrations. This vibration isolation mechanism includes a load-bearing vibration isolation body that supports the weight of the object to be vibration-isolated, It comprises three or more vibration isolation units provided at the connection point between the vibrating base and the vibration-isolating body, The vibration isolation unit is composed of vibration isolation elements, This vibration isolation element consists of a vibration isolation block to which a viscoelastic material is applied, A fixed base is attached to this vibration isolation block in a fixed state and has a connection function with the vibration base, It is configured to include a support bracket that is fixedly attached to the vibration isolation block and has a connection function with the vibration-isolating body, Furthermore, the mounting configuration of the vibration isolation unit is such that at least three vibration isolation units are inclined to align so that the axis of the vibration isolation block is focused toward a vertical line of gravity passing through the center of gravity of the vibration-isolating body. Furthermore, the vibration isolation mechanism is characterized in that the vibration isolation element is fixed in such a state that it supports the vibration-isolated body in an initial load-zero state where the load of the vibration-isolated body has almost no effect on the vibration isolation block.

2. The vibration isolation mechanism according to claim 1, characterized in that, in the mounting configuration of the vibration isolation unit, the convergence position of the axial centerlines of each vibration isolation block is on a vertical centerline passing through the center of gravity of the vibration-isolated object.

3. The vibration isolation mechanism according to claim 1, characterized in that, in the mounting configuration of the vibration isolation unit, the convergence position of the axial cores of each vibration isolation block is the center of gravity of the vibration-isolated object.

4. The vibration isolation mechanism according to claim 1, characterized in that the vibration isolation unit has a semi-enclosed casing portion provided on a fixed base or support bracket, and vibration isolation elements are housed within this casing portion.

5. The vibration isolation blocks in the aforementioned vibration isolation unit are constructed by combining a pair of identical blocks back-to-back, and the combined vibration isolation blocks are fixed to the vibration base via fixed bases at both ends. On the other hand, the vibration isolation mechanism according to claim 1 is characterized in that a protruding support bracket is provided in the intermediate portion of the vibration isolation blocks, which are assembled back-to-back, and the vibration isolation mechanism is fixed to the vibration isolation body via this support bracket.

6. A vibration isolation mechanism for mounting a vibration-damping object on a vibrating substrate in a vibrating environment, which reduces or avoids vibrations. This vibration isolation mechanism includes a load-bearing vibration isolation body that supports the weight of the object to be vibration-isolated, It comprises three or more vibration isolation units provided at the connection point between the vibrating base and the vibration-isolating body, The aforementioned load-dissipating body supports the vibration-dissipating object from below. Furthermore, the vibration isolation unit includes a semi-enclosure casing portion provided on the vibration base side, This casing comprises a vibration-damping element whose installation position can be adjusted within the casing, The vibration isolation element is configured such that the axial ends of the vibration isolation blocks constituting the vibration isolation element are fixed within the casing, and the vibration-isolating object is supported by a support bracket that protrudes from the axial middle portion. Furthermore, in supporting the vibration-damped body, the load-bearing vibration-damping body supports the weight of the vibration-damped body, so that the vibration-damped body is supported in an initial load-zero state, with almost no load acting on the vibration-damping block of the vibration-damping element.

7. The vibration-damped body is a three-dimensional laser measurement sensor, Furthermore, the vibration base is a self-propelled work vehicle or a base directly attached to said work vehicle, characterized in that the vibration isolation mechanism according to claim 6.

8. A method for assembling a vibration isolation unit in a vibration isolation mechanism for mounting a vibration-damped object on a vibrating substrate in a vibrating environment, while reducing or avoiding vibrations, The vibration isolation mechanism to which this method is applied comprises a load-bearing vibration isolation body that supports the weight of the vibration-isolated object, and three or more vibration isolation units provided at the connection between the vibration base and the vibration-isolated object, wherein the load-bearing vibration isolation body supports the vibration-isolated object from below. On the other hand, the vibration isolation unit comprises a semi-enclosure casing provided on the vibration base, and a vibration isolation element body provided within the casing so as to be adjustable in its installation position. The vibration isolation element is configured such that the axial ends of the vibration isolation blocks constituting the vibration isolation element are fixed within the casing, and the vibration-isolating object is supported by a support bracket that protrudes from the axial middle portion. Furthermore, in fixing the vibration isolation unit to the vibration-damped body, the load vibration isolation body supports the weight of the vibration-damped body, so that the vibration isolation unit is fixed in an initial load-zero state where the load of the vibration-damped body hardly acts on the vibration isolation block of the vibration isolation element.

Images