JP2005048917A - Vibration-proof supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost by increasing the versatility of a vibration-proof supporting device. <P>SOLUTION: A vibration-proof mount device 30 has a main body 31 fixed to a base carrier 12 and a stud 33 fixed to a cap 20. An elastic body 37 is mounted between the main body 31 and the stud 33, and the radial vibration between the main body 31 and the stud 33 is absorbed by the elastic body 37. A damping mechanism 40 having damping liquid 43 accommodated in a liquid chamber 42 and a damping member 41 fixed to the stud 33 is mounted at a lower part of the main body 31. Further an air chamber 53 defined by bellows 52 mounted between a plate 51 fixed to the stud 33 and the main body 31, is formed at an upper part of the main body 31, and the load transmitted to the stud 33 from the cap 20 is supported by a pneumatic spring 50 constituted by the air chamber 53. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration isolating support device that supports a load between members and prevents vibration transmission.

  Construction machines that are working vehicles used for civil engineering and construction work include hydraulic excavators, hydraulic cranes, bulldozers, wheel loaders, power shovels, excavator loaders, dump trucks, and the like. Such a construction machine has a vehicle body provided with a lower traveling body and a cab mounted on the vehicle body, i.e., a cab and a work attachment attached to the vehicle body. There are a crawler type using a crawler belt, a truck type using a track carrier, and a wheel type using wheels. For example, in a hydraulic excavator, a vehicle body is constituted by a lower traveling body and a swivel that is rotatably provided on the undercarriage. A front attachment is mounted on the swivel, and a cab, a prime mover, a power distribution mechanism, and the like are incorporated. The front attachment is formed by a boom that is swingably mounted on the upper swing body and an arm that is swingably mounted at the tip of the boom, and a bucket is mounted at the tip of the arm.

  In various construction machines such as hydraulic excavators, the driver's cab, that is, the cab has an anti-vibration function (anti-vibration) so that vibrations during work and travel are not transmitted from the vehicle body to the cab. It is mounted on the car body via As such an anti-vibration support device, for example, as disclosed in Patent Document 1, an elastic body such as a main body case fixed to a vehicle body, an elastic body such as rubber fixed to the inside of the main body case, and an elastic body is used. There is known a so-called liquid-sealed mount that has a stud penetrating through the body and soaks a damping plate fixed to the stud in a damping liquid such as silicone oil sealed in a main body case. In this case, the elastic body has an elastic support function for supporting the load of the cab and delaying the vibration transmission speed from the vehicle body to the cab (relaxing the shock vibration transmission), and the damping plate moves in the damping liquid. It has a damping function that absorbs and dissipates vibration itself that is generated by shear resistance and transmitted from the vehicle body to the cab.

However, in such a mount, since the load of the cab is supported by the elastic body, a hard material that can withstand the load of the cab is used as the elastic body. For this reason, vibration absorption by the elastic body cannot be sufficiently increased, and it is difficult to improve riding comfort. Therefore, for example, in the vibration isolating support device disclosed in Patent Document 2, a stud is attached to an elastic body so as to be movable in the axial direction, a spring is provided between the main body case and the stud, and the load on the cab is supported by the spring. The elastic body is configured to absorb radial vibration and to suppress the radial displacement by its rigidity. As a result, it is possible to improve the ride comfort by making the spring supporting the cab load sufficiently soft.
JP-A-8-189544 (page 2-3, FIG. 1) JP 2002-357238 A (page 2-3, FIG. 2)

  However, if the spring constant of the spring is set to be small in order to improve riding comfort, the amount of displacement of the stud per unit load increases, so that the variation in the mounting height increases if the weight of the cab is different. In addition, since the mounts are usually arranged at the four corners of the cab, when the centroid position of the cab is shifted from the center, the load applied to each mount will be different. The cab tilts due to variations. Furthermore, the cab may be pre-equipped with various options such as a cab guard depending on the specifications, or may be retrofitted, and the weight and the position of the center of gravity may differ depending on the specifications. Therefore, in order to attach the cab to a predetermined height with a predetermined flatness, it is necessary to prepare a mount using a spring according to the weight of the cab, the position of the center of gravity, or the like. As described above, in order to make the vibration isolating support device compatible with the cab of other types of small-volume production, the number of parts is increased and the parts management becomes complicated, which increases the cost of the vibration isolating support device.

  An object of the present invention is to increase the versatility of the vibration isolating support device and reduce the cost.

  The anti-vibration support device of the present invention includes a cylindrical main body with one end closed, a stud disposed on the inner side of the main body, and the stud is attached to the main body and the stud is movably penetrated in the axial direction. An anti-vibration support having an elastic body that suppresses a displacement amount of the stud in the radial direction with respect to the main body, a damping liquid housed in a liquid chamber in the main body, and a damping member fixed to the stud and immersed in the damping liquid An apparatus comprising: a plate fixed to the stud; and an air spring comprising a cylindrical body mounted between the main body and the plate and forming an air chamber therein; and a shaft between the main body and the stud The load in the direction is supported by the air spring. This vibration-proof support device can use a bellows as the cylindrical body. Further, the vibration isolating support device is provided with stopper portions at both axial end portions of the elastic body, and the axial movement of the stud relative to the main body when the plate or the damping member is in contact with the stopper portion. Can be regulated.

  In the present invention, since the axial load between the main body and the stud is supported by the air spring, the spring force of the air spring is changed between the main body and the stud by changing the air pressure supplied to the air chamber. It can be easily set to a value corresponding to the applied axial load. Therefore, even when the load applied between the main body and the stud is different, the same anti-vibration support device can be used, and the versatility of the anti-vibration support device can be enhanced and the cost can be reduced. In addition, by using the air spring, the spring force can be reduced as compared with the case where an axial load is supported by an elastic body such as rubber, and vibration absorption can be improved.

  The anti-vibration support device of the present invention is characterized in that the compressed air in the air chamber is supplied into the liquid chamber. This vibration-proof support device can supply compressed air to the liquid chamber through a gap between the stud and the elastic body.

  In the present invention, since the hydraulic pressure of the damping liquid stored in the liquid chamber is increased, cavitation is suppressed and the damping force by the damping member is increased. Further, since the damping member can be reduced in size by increasing the damping force, the vibration isolating support device can be reduced in size and weight.

  The anti-vibration support device of the present invention includes an air pressure source that supplies compressed air to the air chamber, and a control valve that is provided between the air pressure source and the air chamber and controls the air pressure of the air chamber. Features. The anti-vibration support device includes position detection means for detecting a relative position between the main body and the stud, and controls the control valve based on the relative position between the main body and the stud detected by the position detection means. It is characterized by.

  In the present invention, since the air pressure of the air chamber can be easily adjusted, the spring force of the air spring can be easily set to a value corresponding to the axial load applied between the main body and the stud. Since the height of the vibration isolating support device can always be constant, the height of the supported member can be kept constant.

  The anti-vibration support device according to the present invention is characterized in that the main body is fixed to a lower traveling body of a construction machine, and the stud is fixed to a cab mounted on the lower traveling body. The vibration-proof support device may be configured such that the main body is fixed to a truck side of the railway vehicle and the stud is fixed to a vehicle body side of the railway car. Further, the vibration isolating support device may be configured such that the main body is fixed to a wheel support portion that rotatably supports a vehicle wheel, and the stud is fixed to a vehicle body side of the vehicle.

  In the present invention, since the load of the construction machine, railway vehicle, automobile cab and vehicle body is supported by the air spring, vibration transmitted from the lower traveling body, the carriage, and the wheel support portion to the cab and the vehicle body is not affected. This will reduce the ride comfort of construction machinery, railway vehicles, and automobiles.

  According to the present invention, by changing the air pressure of the air chamber, the same anti-vibration support device can be easily adapted to changes in load. Can be reduced. In addition, since the air spring can reduce the spring force as compared with a case where an axial load is supported by an elastic body such as rubber, vibration absorption can be enhanced.

  Further, according to the present invention, since the cavitation can be suppressed by increasing the hydraulic pressure of the damping liquid stored in the liquid chamber, the damping force by the damping member can be increased. Further, the damping member can be reduced in size by increasing the damping force, and the vibration-proof support device can be reduced in size and weight.

  Furthermore, according to the present invention, since the air pressure of the air chamber can be easily adjusted from the control valve, the spring force of the air spring is easily set to a value corresponding to the axial load applied between the main body and the stud. Since the height of the anti-vibration support device can always be constant, the height of the supported member can be kept constant.

  Furthermore, according to the present invention, since the air pressure of the air chamber can be automatically set in response to the change in the axial load applied between the main body and the stud, the setting of the spring force is further facilitated. Can do.

  Furthermore, according to the present invention, when used between the lower traveling body of the construction machine and the cab, between the railcar bogie and the vehicle body, or between the wheel support portion of the automobile and the vehicle body, Vibration transmitted to the vehicle body is reduced, and the riding comfort of construction machines, railway vehicles, and automobiles can be improved.

  Furthermore, according to the present invention, the vibration in the high frequency region applied between the main body and the stud is absorbed by the air spring, and the vibration in the low frequency region is absorbed by the damping mechanism or the elastic body. The vibration can be improved. Furthermore, for the impact input applied between the main body and the stud, the amount of displacement can be suppressed by the rigidity of the elastic body in the horizontal direction, and the input load can be relaxed by an air spring having high damping characteristics in the vertical direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing a hydraulic excavator provided with an anti-vibration support device according to an embodiment of the present invention. A vehicle body 11 of a hydraulic excavator 10 which is a construction machine has a lower traveling body 12. The lower traveling body 12 is provided with a swivel 13 that can swivel. The lower traveling body 12 is a track type having a track carrier 15 spanned over the sprocket 14, but may be a crawler type using a crawler belt or a wheel type lower traveling body using wheels.

  A boom 16 is attached to the swivel base 13 so as to be swingable in the vertical direction, and an arm 17 is attached to the tip of the boom 16 so as to be swingable in the vertical direction. It is attached so that it can swing freely in the direction. A hydraulic cylinder 19a is provided between the swivel base 13 and the boom 16 for swinging the boom 16 in the vertical direction, and a hydraulic pressure is provided between the boom 16 and the arm 17 for swinging the arm 17 in the vertical direction. A cylinder 19b is provided. The bucket 18 is driven to swing by a hydraulic cylinder 19c.

  A cab or cab 20, also called a cab box, is mounted on the swivel base 13 constituting the lower traveling body 12, and the operation of the boom 16, the arm 17, the bucket 18, and the vehicle body 11 is performed by a passenger boarding the cab 20. It has come to be. The cab 20 is formed in a box shape having a bottom wall portion 20a, a ceiling wall portion 20b, left and right side wall portions 20c, and front and rear side wall portions 20d. The left and right side wall portions 20c are opened and closed when a passenger gets in and out of the cab. The door 21 is openably and closably mounted, and a transparent glass plate 22 is provided on the door 21 and the front and rear side wall portions 20d to ensure an external view of the occupant. In addition, a reinforcing frame, that is, a cab guard 23 is attached to the swivel base 13 so as to surround the cab 20 so as to protect the cab 20 in the event of a fall or a collision.

  2 is a cross-sectional view taken along the line AA shown in FIG. 1, and the cab 20 is elastically supported between the bottom wall portion 20a of the cab 20 and the swivel 13 so as to be swingable in the vertical direction and the horizontal direction. Two anti-vibration mount devices 30 (hereinafter referred to as mounts 30) are attached. These mounts 30 which are vibration-proof support devices are arranged at the four corners of the bottom wall portion 20a of the cab 20, that is, two of the four vibration-proof mount devices 30 are left and right on the front end side of the cab 20. The other two are arranged apart from each other on the rear end side of the cab 20.

  FIG. 3 is a cross-sectional view showing details of the image stabilization support device shown in FIG. 2, and FIG. 4 is a block diagram showing a control system of the image stabilization support device shown in FIG.

  As shown in FIG. 3, these mounts 30 include a main body 31 fixed to the swivel base 13, that is, the lower traveling body 12 by a fastening member (not shown), and a stud 33 fixed to the bottom wall portion 20 a of the cab 20 by a bolt 32. have. The main body 31 has a cylindrical portion 31b formed integrally with the mounting plate 31a and a cup-shaped lid portion 31c fixed to the cylindrical portion 31b via the mounting plate 31a, and one end is closed as a whole. It is formed in a cylindrical shape. On the other hand, the stud 33 is formed in a rod shape having a circular cross section, and is disposed inside the main body 31 with its axial direction directed in the vertical direction of the vehicle body 11. A sleeve 36 is coaxially disposed on the outer periphery of the stud 33 via a slide bearing 35, and an elastic body 37 formed in a cylindrical shape with rubber or the like is provided between the sleeve 36 and the cylindrical portion 31 b of the main body 31. It is fixed. That is, the elastic body 37 attached to the inside of the main body 31 is located between the main body 31 and the stud 33, and the stud 33 is penetrated through the elastic body 37 so as to be movable in the axial direction. Thus, the elastic body 37 is not subjected to vibration or load in the axial direction, that is, the vertical direction, between the main body 31 and the stud 33, and the elastic body 37 absorbs vibration in the radial direction and is also radially or horizontally horizontal due to its rigidity. It is configured to suppress the amount of displacement in the direction.

  The mount 30 is provided with a damping mechanism 40 for attenuating axial and horizontal vibrations and impacts between the main body 31 and the stud 33 that occur during work or travel. The damping mechanism 40 includes a damping member 41. The damping member 41 includes an end plate portion 41a and a cylindrical portion 41b. One end of the stud 33, that is, the lid portion 31c is attached to the end plate portion 41a. It is fixed to the end (in the illustrated case, the lower end). Further, a liquid chamber 42 is formed in the main body 31 by being partitioned by a lid portion 31c and an elastic body 37, and a damping liquid 43 such as silicone oil is accommodated in the liquid chamber. The attenuating member 41 is immersed in the attenuating liquid 43. When an axial or horizontal vibration is applied between the main body 31 and the stud 33, the attenuating member 41 moves in the attenuating liquid 43 and moves to the liquid chamber. The damping liquid 43 is moved inside 42. Thereby, the vibration energy is converted into the kinetic energy of the liquid, and the vibration and impact applied to the stud 33 are attenuated. In this way, the vibration and impact between the main body 31 and the stud 33 are attenuated by the damping mechanism 40. Note that a through-hole through which the damping liquid 43 passes may be formed in the end plate portion 41a to adjust the damping force.

  A seal member 44 which is a lip packing such as a U-packing is incorporated between the sleeve 36 and the stud 33 so as to be located on the liquid chamber 42 side. The seal member 44 is disposed with the lip portion directed toward the liquid chamber 42, and prevents leakage of the damping liquid 43 from the liquid chamber 42.

  The mount 30 is provided with an air spring 50 located on the opposite side of the main body 31 from the damping mechanism 40, and the axial load between the main body 31 and the stud 33 is supported by the air spring 50. It is like that. The air spring 50 has an end plate portion 51a and a cylindrical portion 51b, and is fixed to the other end (upper end in the case of illustration) of the stud 33 by the bolt 32 described above, and the cylindrical portion of the plate 51 51b and a bellows 52 which is a cylindrical body mounted between the cylindrical portion 31b of the main body 31, and the flexible bellows 52 defines an air chamber 53 therein by the plate 51. ing. Compressed air is supplied to the air chamber 53, and a spring force is applied to the plate 51 upward in the axial direction by the air pressure generated by the compressed air. Then, an axial load applied from the cab 20 to the stud 33 is supported by this spring force.

  As described above, in the vibration isolating mount device 30, the axial load between the main body 31 and the stud 33 is supported by the air spring 50, so that the air spring 50 is changed by changing the air pressure supplied to the air chamber 53. This spring force can be easily set to a value corresponding to the load from the cab 20 applied to the stud 33. Therefore, even when the load applied to the stud 33 is different, such as when the weight and the center of gravity of the cab 20 are different, the same anti-vibration mount device 30 can be used, and the versatility of the anti-vibration mount device 30 is enhanced. Cost can be reduced. Moreover, since the spring force can be reduced by using the air spring 50 as compared with the case where the load is supported by an elastic body such as rubber, vibration absorption can be improved. Therefore, the vibration transmitted from the lower traveling body 12 to the cab 20 is sufficiently reduced by the air spring 50, and the riding comfort of the cab 20 can be improved.

  In this vibration isolating mount device 30, the seal member 44 is a lip packing with the lip portion disposed toward the liquid chamber 42, so that leakage of the damping liquid 43 from the liquid chamber 42 to the air chamber 53 is prevented. However, the flow of compressed air from the air chamber 53 toward the liquid chamber 42 through the gap between the stud 33 and the elastic body 37, that is, the sleeve 36 can be allowed. Therefore, the seal member 44 can prevent the damping liquid 43 from leaking and supply the compressed air in the air chamber 53 to the liquid chamber 42 via the gap between the stud 33 and the elastic body 37, that is, the sleeve 36. Accordingly, the internal pressure of the liquid chamber 42, that is, the hydraulic pressure of the damping liquid 43 accommodated in the liquid chamber 42 is increased by the compressed air, and a cavity phenomenon that occurs when the damping member 41 moves in the damping liquid 43. That is, the damping force of the damping mechanism 40 can be increased by suppressing cavitation.

  In the present embodiment, only the seal member 44 is provided between the stud 33 and the elastic body 37, that is, the sleeve 36. In addition, for example, the air chamber 53 is provided on the upper end side of the sleeve 36. A sealing member that prevents leakage of compressed air from the liquid chamber 42 to the liquid chamber 42 may be attached.

  As described above, in the vibration proof mount device 30, the compressed air in the air chamber 53 is supplied to the liquid chamber 42, so that the cavitation is generated by increasing the hydraulic pressure of the damping liquid 43 accommodated in the liquid chamber 42. The damping force by the damping mechanism 40, that is, the damping member 41 is increased. Further, since the damping force is determined by the product of the internal pressure applied to the liquid and the radial cross-sectional area of the end plate portion 41a of the damping member 41, the radial cross-sectional area of the end plate portion 41a is reduced by increasing the internal pressure. Can do. Therefore, the vibration-proof mount device 30 can be reduced in size and weight.

  In the air spring 50, when an excessive load is applied between the main body 31 and the stud 33, the displacement amount of the stud 33 with respect to the main body 31 may be excessive. Therefore, the elastic body 37 is integrally provided with stopper portions 37a and 37b that protrude in the axial direction from the end of the cylindrical portion 31b of the main body 31 at both ends in the axial direction. When the stud 33 is largely displaced downward with respect to the main body 31, the stopper portion 37a comes into contact with the plate 51 and restricts any further relative movement in the axial direction of the stud 33 relative to the main body 31, that is, downward movement. When the stud 33 is largely displaced upward with respect to the main body 31, the stopper portion 37b comes into contact with the damping member 41 and restricts any further relative movement in the axial direction of the stud 33 with respect to the main body 31, that is, upward movement. As described above, even if the axial load is supported by the air spring 50, the displacement amount of the stud 33 with respect to the main body 31 due to an excessive load is prevented, and the air spring 50 of the mount 30 is prevented from being damaged. be able to.

  An air supply / exhaust port 55 is formed in the plate 51, and as shown in FIG. 4, an air pressure source 57 is connected to the air supply / exhaust port 55 of each mount 30 through a flow path 56. As the air pressure source 57, a compressor or the like mounted on the vehicle body 11 and driven by a not-shown prime mover or the like is used. Compressed air having a predetermined pressure discharged from the air pressure source 57 is supplied to each mount 30 via the flow path 56. It is supplied to the air chamber 53. Between the air pressure source 57 and the mount 30, there are provided a reservoir tank 58 (accumulator) for reducing pulsation and pressure drop of compressed air, a filter 59 for removing dust and drain in the compressed air, and the like. The air supply / exhaust port 55 is not limited to the plate 51, and may be provided in any member as long as the compressed air can be supplied to the air chamber 53, such as the cylindrical portion 31 b of the main body 31.

  A leveling valve (automatic height adjustment valve) 60 is provided between the air pressure source 57 and the air chamber 53 of each mount 30, and compressed air supplied to each mount 30, that is, air pressure of each air chamber 53. Are individually controlled by these leveling valves 60.

  As shown in FIG. 3, the leveling valve 60 includes a valve main body 60 a as a control valve fixed to the swivel base 13 and a control lever 60 b that is swingably provided on the valve main body 60 a. The control lever 60b is connected to the stud 33 via a link or the like (not shown), and is interlocked with the vertical movement of the stud 33. The valve body 60a is controlled by a control lever 60b. The air pressure source 57 and the air supply / exhaust port 55 communicate with each other according to the position of the control lever 60b, and the air supply / exhaust port 55 is opened to the atmosphere. It can be switched to the state. That is, the control lever 60b has a function as position detecting means for detecting the relative position between the main body 31 and the stud 33, and the valve main body 60a is positioned at the relative position between the main body 31 and the stud 33 detected by the control lever 60b. It is controlled on the basis.

  With such a structure, when the axial load applied from the cab 20 to the stud 33 increases and the mounting height of the cab 20 falls below a predetermined position, the valve is controlled by the control lever 60b interlocked with the stud 33. The main body 60a is switched to a state in which the air pressure source 57 and the air supply / exhaust port 55 are communicated with each other. Then, compressed air is supplied from the air pressure source 57 to the air supply / exhaust port 55 to increase the air pressure of the air chamber 53, that is, the spring force applied to the stud 33, and the stud 33 pushes up the cab 20. On the other hand, when the axial load applied from the cab 20 to the stud 33 decreases and the mounting height of the cab 20 rises to a predetermined position or higher, the valve main body 60a is connected to the air supply / exhaust port 55 by the control lever 60b. Can be switched to a position to release the atmosphere. As a result, the air pressure inside the air chamber 53 decreases, the spring force applied to the stud 33 decreases, and the position of the cab 20 decreases. When the cab 20 is in the specified position, the control lever 60b is in a neutral position, and the air pressure inside the air chamber 53 is kept constant and the state is maintained. In this case, since the control of each mount 30 is performed by the individual leveling valve 60, for example, even when the weight or the center of gravity of the cab 20 changes, the control of each mount 30 is automatically performed in accordance with this. As a result, the mounting height and levelness of the cab 20 are always kept constant.

  In this way, in this vibration isolating mount device 30, the valve main body 60a is automatically controlled by the control lever 60b based on the relative position between the main body 31 and the stud 33, so the air pressure in the air chamber 53 is the same as that of the main body 31. It is automatically set corresponding to the change in the axial load applied between the studs 33. Therefore, setting of the spring force of the vibration-proof mount device 30 can be facilitated.

  In the present embodiment, the air pressure in the air chamber 53 is based on the relative position between the main body 31 and the stud 33 using the leveling valve 60 having the valve main body 60a as the control valve and the control lever 60b as the position detecting means. However, the present invention is not limited to this, and the air pressure may be set by manually operating the valve body 60a. Even in this case, the air pressure of the air chamber 53 can be easily adjusted from the valve main body 60 a, so that the value of the spring force of the air spring according to the axial load applied between the main body 31 and the stud 33. Can be set easily.

  FIG. 5 is a front view showing a railway vehicle to which the vibration isolating support device of the present invention is applied, and FIG. 6 is a cross-sectional view showing a main part of a truck to which the vibration isolating support device of the present invention is applied.

  As shown in FIG. 5, the railway vehicle 71 has a carriage 74 having wheels 73 engaged with rails 72 laid on the road surface, and the wheels 73 are driven by a drive source (not shown) such as an electric motor. Thus, the vehicle travels along the rail 72. A vehicle body 75 provided with a driver's cab and a cabin is mounted on the carriage 74, and the vehicle body 75 travels together with the carriage 74. A vibration isolating support device 76 having a structure similar to that of the vibration isolating mount device 30 shown in FIG. 3 is mounted between the carriage 74 and the vehicle body 75 as a so-called pillow spring. The main body is fixed to the carriage 74, and the stud is fixed to the vehicle body 75. Thereby, the load of the vehicle body 75 is supported by the air spring 50 of the vibration isolating support device 76, and the vibration between the carriage 74 and the vehicle body 75 generated during traveling is absorbed by the vibration isolation support device 76.

  On the other hand, the truck 81 shown in FIG. 6 is an automobile having wheels 82, and the wheels 82 are rotatably supported on the axle 82a by a wheel support portion 83 such as an axle case. The wheel support portion 83 is attached to the vehicle body 85 via a vibration isolation support device 84 having a structure similar to that of the vibration isolation mount device 30 shown in FIG. 3. In this case, the main body of the vibration isolation support device 84 is the wheel support. The stud is fixed to the vehicle body 85. As a result, the load of the vehicle body 85 is supported by the air spring 50 of the vibration isolating support device 84, and vibration between the wheel support portion 83 and the vehicle body 85 that occurs during traveling or the like is absorbed by the vibration isolation support device 84. Also in this case, the height of the vehicle body 85 relative to the wheel support 83 can be automatically controlled by the leveling valve 60 mounted on the vehicle body 85.

  In FIGS. 5 and 6, members corresponding to those described above are denoted by the same reference numerals.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the bellows 52 is used as the cylindrical body. However, the present invention is not limited to this, and a diaphragm may be used as long as it is formed in a cylindrical shape.

  In the above embodiment, the compressed air is supplied from the air chamber 53 to the liquid chamber 42 through the gap between the stud 33 and the elastic body 37. However, the present invention is not limited to this. If this is prevented, it may be supplied via a supply channel provided in another part.

  Further, in the above-described embodiment, the relative position between the main body 31 and the stud 33 is detected by the control lever 60b having a function as a position detecting means, and the valve main body 60a as the control valve is controlled by the control lever 60b. However, the present invention is not limited to this. For example, a relative position between the main body 31 and the stud 33 is detected using a mechanical sensor, an electrical or magnetic sensor, and a CPU or a memory to which the detection signal is input is provided. You may make it drive the valve main-body part 60a used as an electromagnetic valve etc. with the control apparatus with which it was equipped.

  Furthermore, in the above-described embodiment, the air pressure source 57 is connected to the air chamber 53 via a control valve so that the air pressure of the air chamber 53 can be easily increased or decreased. After supplying compressed air to a prescribed air pressure without providing a control valve, the air supply / exhaust port 55 may be closed with a stopper.

  Furthermore, in the said embodiment, although the case where the anti-vibration support apparatus of this invention is applied to the hydraulic shovel 10, the railway vehicle 71, and the truck 81 is shown, it is not restricted to this, Other construction machines, vehicles, etc. You may use for. Moreover, it is not limited to a construction machine or a vehicle, and may be mounted between any members as long as they are between members to which loads and vibrations are transmitted.

  Furthermore, in the above-described embodiment, the four anti-vibration mount devices 30 are arranged at the four corners of the bottom wall portion 20a of the cab 20. Can be set arbitrarily.

  Furthermore, in the above-described embodiment, a leveling valve 60 is provided for each mount 30 and the air pressure of each mount 30 is individually controlled. A sensor for detecting the vertical position (height) of the cab 20 may be provided, and the air pressure of each mount 30 may be comprehensively controlled based on the output information of the sensor. Further, sensors for detecting the vertical position (height) of the cab 20 are provided immediately below the front left and right central portions and the rear left and right central portions of the cab 20, respectively, and based on output information of the sensors provided on the front side. The air pressure of the front left and right mounts 30 can be controlled, and the air pressure of the rear left and right mounts 30 can be controlled based on the output information of the sensor provided on the rear side. Further, a sensor for detecting the vertical position (height) of the cab 20 is provided directly below the front-rear central part on the left side of the cab 20 and the front-rear central part on the right side, and the left side based on the output information of the sensor provided on the left side. It is also possible to control the air pressure of the front and rear mounts 30 and control the air pressure of the front and rear right mounts 30 based on the output information of the sensor provided on the right side.

It is a side view which shows the hydraulic shovel provided with the vibration proof support apparatus which is one embodiment of this invention. It is sectional drawing which follows the AA line shown in FIG. It is sectional drawing which shows the detail of the vibration isolating support apparatus shown in FIG. It is a block diagram which shows the control system of the anti-vibration support apparatus shown in FIG. 1 is a front view showing a railway vehicle to which a vibration isolating support device of the present invention is applied. It is sectional drawing which shows the principal part of the track | truck with which the vibration isolating support apparatus of this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic excavator 11 Car body 12 Lower traveling body 13 Swivel base 14 Sprocket 15 Track carrier 16 Boom 17 Arm 18 Bucket 19a-19c Hydraulic cylinder 20 Cab 20a Bottom wall part 20b Ceiling wall part 20c Left and right side wall part 20d Front and rear side wall part 21 Door 22 Glass Plate 23 Cab guard 30 Anti-vibration mount device 31 Main body 31a Mounting plate 31b Cylindrical portion 31c Lid portion 32 Bolt 33 Stud 35 Sliding bearing 36 Sleeve 37 Elastic body 37a, 37b Stopper portion 40 Damping mechanism 41 Damping member 41a End plate portion 41b Cylindrical portion 42 Liquid chamber 43 Damping liquid 44 Seal member 50 Air spring 51 Plate 51a End plate portion 51b Cylindrical portion 52 Bellows 53 Air chamber 54 Seal member 55 Air supply / exhaust port 56 Flow path 57 Air pressure source 58 Reservoir tank 59 Fi Luther 60 Leveling valve 60a Valve body 60b Control lever 71 Railway vehicle 72 Rail 73 Wheels 74 Bogie 75 Car body 76 Anti-vibration support device 81 Truck 82 Wheel 82a Axle 83 Wheel support portion 84 Anti-vibration support device 85 Car body

Claims (10)

A cylindrical main body with one end closed, a stud disposed inside the main body, and a stud mounted in the main body and movably penetrating in the axial direction, and the radial displacement of the stud relative to the main body An anti-vibration support device having an elastic body that suppresses the amount, a damping liquid that is accommodated in a liquid chamber in the main body, and a damping member that is fixed to the stud and is immersed in the damping liquid,
An air spring comprising a plate fixed to the stud and a cylindrical body mounted between the body and the plate and forming an air chamber therein;
An anti-vibration support device that supports an axial load between the main body and the stud by the air spring.   2. The anti-vibration support device according to claim 1, wherein the cylindrical body is a bellows.   The anti-vibration support device according to claim 1 or 2, wherein stoppers are provided at both ends of the elastic body in the axial direction, and the plate or the damping member is in contact with the stopper portion, whereby the axial direction of the stud with respect to the main body is provided. The anti-vibration support device is characterized in that the relative movement is restricted.   The anti-vibration support device according to any one of claims 1 to 3, wherein the compressed air in the air chamber is supplied into the liquid chamber.   5. The anti-vibration support device according to claim 4, wherein compressed air is supplied to the liquid chamber through a gap between the stud and the elastic body.   6. The anti-vibration support device according to claim 1, wherein an air pressure source that supplies compressed air to the air chamber, and an air pressure of the air chamber that is provided between the air pressure source and the air chamber. An anti-vibration support device having a control valve for controlling the vibration.   7. The anti-vibration support device according to claim 6, further comprising position detection means for detecting a relative position between the main body and the stud, and the control valve based on the relative position between the main body and the stud detected by the position detection means. An anti-vibration support device for controlling the vibration.   The vibration-proof support device according to any one of claims 1 to 7, wherein the main body is fixed to a lower traveling body of a construction machine, and the stud is fixed to a cab mounted on the lower traveling body. An anti-vibration support device.   The anti-vibration support device according to any one of claims 1 to 7, wherein the main body is fixed to a bogie side of a railway vehicle, and the stud is fixed to a vehicle body side of the railway vehicle. Vibration support device. The vibration-proof support device according to any one of claims 1 to 7, wherein the main body is fixed to a wheel support portion that rotatably supports a wheel of an automobile, and the stud is fixed to a vehicle body side of the automobile. An anti-vibration support device.