JPH0669473U - Air spring structure with displacement limiting mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] While reducing the control power that changes the internal pressure of the air spring in response to fluctuations in external force acting on the supported body,
Make position control easy. [Structure] In the air spring A for supporting the supported body 2 in a vibration-proof manner by adjusting the pressure of the internal pressure chamber R so as to maintain the relative position to the installation base 1 according to the displacement of the supported body 2, the air spring A A displacement limiting mechanism L for limiting the compressive displacement of the air spring A is provided in the internal pressure chamber R, and the displacement limiting mechanism L reduces the volume of the air spring internal pressure chamber R.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air spring for vibration-proofing and supporting machinery such as a marine engine, and more particularly to an air spring structure in which a displacement limiting mechanism is provided in an internal pressure chamber of the air spring.

[0002]

[Prior art]

 Conventionally, vibrations are generated during operation of marine engines, other engines, and machinery such as reduction gears, so vibration is supported to prevent the vibrations from being transmitted to the hull or installation base.

As this vibration-proof support, for example, there is a method in which a vibration-proof rubber is interposed in a support portion to support machinery so that the vibration-proof rubber absorbs vibration.

However, it is difficult to obtain a sufficient anti-vibration effect with the anti-vibration structure using the anti-vibration rubber, and it is insufficient for machines and the like that require particularly high anti-vibration effect.

As a conventional technique of this kind, there is a device described in Japanese Utility Model Laid-Open No. 61-116249. The invention described in this publication is an active anti-vibration support device for supporting the machinery such as a marine diesel engine with a cylindrical anti-vibration rubber. By controlling the internal pressure of this anti-vibration rubber, the machine etc. It is designed so that it can be displaced in any direction to block low-frequency vibrations. Therefore, anti-vibration effect cannot be expected for medium and high frequency vibrations.

Therefore, in machines and the like that require high vibration damping effect, an air spring with high vibration damping effect (in the present specification, a spring using gas is used so that minute vibrations are not transmitted to the support). There is a vibration-proof structure for supporting a supported body by using the general term "."

As a technique for absorbing vibration using this air spring, there is a device described in Japanese Utility Model Laid-Open No. 1-165342 filed by the applicant of the present application as an anti-vibration supporting device for machines and the like. According to the invention described in this publication, as shown in the sectional view of FIG. 5, an air spring 50 arranged on a mounting base 51 supports a supported object 52 such as machinery, and an actuator 53 is attached to the air spring 50. By providing the air spring height adjusting device 54 provided in communication with the air spring height adjusting device 54 by the actuator 53, the actuator 53 responds to the fluctuation of the external force acting on the air spring 50 from the supported body 52. Of the air spring 5 by supplying pressurized air from the air spring 54a into the air spring 50 through the communication pipe 55 or discharging the pressurized air in the air spring 50 to the air spring height adjusting device 54. Is kept constant so that the relative position of the supported body 52 with respect to the installation table 51 is always constant.

[0008]

[Problems to be solved by the device]

 By the way, there is a marine engine, for example, as a supported body that requires high vibration-proof support such as an air spring.In this marine engine, it is held in place by a bearing or the like provided on the hull side. Multiple components, such as the drive shaft, exhaust pipe, and intake pipe, whose relative positions cannot be changed significantly from the hull side are connected.

On the other hand, in such a marine engine, when the hull is greatly shaken by rolling or pitching (hereinafter referred to as rocking), an external force applied from the supported body to the installation base side fluctuates due to the shaking, The height of the air spring that supports the engine changes as the external force fluctuates. Therefore, when the hull oscillates, the relative position changes between the hull side and the supported side.

When the relative position changes between the hull side and the supported side in this way, in the engine, the drive shaft, the exhaust pipe, and the intake pipe connected to the hull side as described above. There is a problem that misalignment occurs in component parts such as.

Therefore, when the supported body is supported by the air spring, it is necessary to control so that the relative positional relationship with the mounting base side becomes constant with respect to the swing. As this method, in Japanese Utility Model Laid-Open No. 1-165342 described above, in addition to the air spring 50 that supports the supported body, another air spring is used in order to keep the height of the supported body constant. 54a (hereinafter referred to as an air cylinder) is connected, and by changing the internal volume of the air cylinder 54a, the pressure of the air spring system is changed and the height of the supported object is kept constant (position control). Function) was provided.

However, in the vibration isolating support device such as the above-mentioned machines, when the pressure of the air spring system is changed by changing the inner volume of the air cylinder, the control air spring 50 and the air cylinder 54a are Since it is necessary to compress and control the air in the communication pipe 55 connecting them, the control volume is large. For example, in order to double the pressure in the air spring 50, these volumes should be halved. I needed to. Therefore, a large air cylinder 54a is required to control the air spring 50.

Further, when the height of the air spring 50 is controlled by changing the volume in the air cylinder 54a in this way, even if an attempt is made to perform quick control in accordance with fluctuations in external force acting on the supported body, Since the volume change amount is large, it is difficult to control.

Further, in the above-mentioned marine engine, a flexible bellows that absorbs a certain amount of displacement is provided between the drive shaft, the exhaust pipe, the intake pipe, etc. connected to the hull side. It is necessary to stop the displacement within the allowable displacement value of the bellows. In addition, in order to prevent damage to the air spring when it is excessively displaced, it is necessary to provide a displacement limiting mechanism that prevents displacement beyond a predetermined displacement. However, in the case of a ship, it was difficult to install a displacement limiting mechanism in a narrow space because the space for installing an engine etc. was limited.

There is a diaphragm type air spring in which the volume inside the air spring is reduced, but it is much more expensive than the bellows type and, in addition, it is necessary to manufacture a die for manufacturing. Since it takes a lot of cost and time to individually manufacture a product according to the weight of a supported body and fluctuations in external force, it is difficult to apply it to vibration isolation of general machinery and the like.

In view of the above problems, the present invention reduces the control power for changing the internal pressure of the air spring in response to the fluctuation of the external force acting on the supported body, and at the same time, the air with the displacement limiting mechanism facilitates the position control. An object is to provide a spring structure.

[0017]

[Means for Solving the Problems]

 In order to achieve the above object, the air spring structure with a displacement limiting mechanism in the present invention adjusts the pressure of the internal pressure chamber so as to maintain the relative position to the installation base according to the displacement of the supported body, and the supported body is supported. In the air spring for vibration-proof support, a displacement limiting mechanism for limiting the compression displacement of the air spring is provided in the inner pressure chamber of the air spring, and the displacement limiting mechanism reduces the volume of the air spring inner pressure chamber. It is characterized by having done.

[0018]

[Action]

 According to the above configuration, even if the air spring is compressed and displaced in response to the displacement of the supported body, the displacement limiting mechanism provided in the internal pressure chamber of the air spring limits the displacement so that the displacement does not exceed the predetermined displacement. .

Further, by providing this displacement limiting mechanism in the internal pressure chamber of the air spring, the internal pressure chamber volume of the air spring can be greatly reduced.

By thus reducing the volume of the internal pressure chamber of the air spring, the control power corresponding to the fluctuation of the external force acting on the supported body becomes small, and the volume for control also decreases, so that the air spring is reduced. Can be easily controlled, which makes it easy to maintain the relative positions of the supported body and the mounting base.

[0021]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of an air spring structure with a displacement limiting mechanism according to the present invention.

As shown in the figure, an air spring A is interposed between the installation base 1 and the supported body 2. The lower face plate 3 of this air spring A is on the installation base 1 side, and the upper face plate 4 is covered. They are fixed to the support 2 side, respectively. The rubber bellows 5 forming the outer shell of the air spring A are held by the projections 6 provided on the inner surfaces of the double-sided plates 3 and 4. The face plates 3, 4 and the rubber bellows 5 form an internal pressure chamber R, and a communication pipe 7 for supplying air to the internal pressure chamber R is provided on the upper face plate 4 side.

A buffer member 8 that reduces the internal volume of the internal pressure chamber R and acts as a displacement limiting mechanism L is provided in the internal pressure chamber R of the general air spring A thus formed. The volume of the internal pressure chamber R of the air spring A is greatly reduced.

According to the present invention configured as described above, as shown in the sectional view of FIG. 5 described above, the supported body 2 such as machinery is supported by the air spring A arranged on the installation base 1, and the supported body is supported. It is used for the air spring A that adjusts the pressure of the internal pressure chamber R of the air spring A according to the fluctuation of the external force used for 2, and controls so that the relative position between the installation base 1 and the supported body 2 is always constant. . Therefore, when the external force acting on the supported body 2 increases, for example, at the location where the air spring A that supports the supported body 2 at a plurality of locations is located, compressed air is introduced from the communication pipe 7 into the internal pressure chamber R 1. The internal pressure is increased to control the relative position of the installation base 1 and the supported body 2 so as not to narrow. In addition, at a place where the external force acting on the supported body 2 decreases, the compressed air in the internal pressure chamber R is discharged from the communication pipe 7 to lower the internal pressure, and the relative position between the mounting base 1 and the supported body 2 is widened. Control not to.

The operation of the air spring A of the present invention controlled as described above will be explained based on the conceptual diagrams of FIGS. 2 (a) and 2 (b) showing the operation of the displacement limiting mechanism L in the first embodiment. .

First, according to the air spring A of the present invention, by providing the buffer member 8 in the internal pressure chamber R, the volume of the internal pressure chamber R is significantly reduced as compared with the conventional air spring. Since the pressure control power of R becomes small and the spring constant becomes high, displacement control can be performed easily, so control is normally performed in the state shown in (a).

When the external force significantly increases from the normal state shown in (a) and the displacement B between the mounting base 1 and the supported body 2 reaches an allowable value as shown in (b), the buffer member 8 The upper surface comes into contact with the lower surface of the upper face plate 4 and restricts further displacement, thereby serving as a displacement restricting mechanism L.

Next, a second embodiment of the air spring structure with a displacement limiting mechanism according to the present invention will be described with reference to FIG. The second embodiment is an embodiment in which the shape of the lower face plate 3 in the first embodiment is changed and the thickness of the cushioning member 8 is reduced, and the inner pressure chamber of the air vane A is provided in the central portion of the lower face plate 13. A convex portion 13a protruding to the R is formed, and a cushioning member 18 is provided on the upper surface of the convex portion 13a.

Therefore, according to the second embodiment, the volume of the internal pressure chamber R of the air spring A is greatly reduced by the volume of the convex portion 13a of the lower face plate 13 and the buffer member 18, so that the first embodiment described above is adopted. Similarly, the pressure control power of the internal pressure chamber R is reduced and the displacement control is facilitated.

Next, a third embodiment of the air spring structure with a displacement limiting mechanism according to the present invention will be described with reference to FIG. In the third embodiment, the shape of the lower face plate 13 in the second embodiment is changed and the arrangement of the buffer member 18 is changed, and the communication pipe 7 is provided so as to communicate with the internal pressure chamber R from the lower face plate 23 side. This is an example. In this embodiment, a two-step convex portion 23a that protrudes into the internal pressure chamber R of the air spring A is formed in the central portion of the lower face plate 23, and the lower surface of the upper face plate 4 on which the convex portion 23a is located cushions. A member 28 is provided. A communication pipe 7 for supplying compressed air to the internal pressure chamber R is provided in the central portion of the lower face plate 23.

Therefore, in the third embodiment as well, the volume of the internal pressure chamber R of the air spring A is greatly reduced by the volume of the convex portion 23a of the lower face plate 23 and the buffer member 28, so that the first and second embodiments described above are performed. Similar to the embodiment, the pressure control power of the internal pressure chamber R becomes smaller and the displacement control becomes easier.

As described above, according to the present invention, by disposing the displacement limiting mechanism L in the internal pressure chamber R of the air spring A, the volume of the internal pressure chamber R of the air spring A is significantly reduced. The pressure can be easily increased, which reduces the compression power of air required to control the pressure in the internal pressure chamber R, and keeps the height of the mounting base 1 and the supported body 2 constant with a smaller power. it can.

Further, since the spring constant is increased by reducing the volume of the internal pressure chamber R of the air spring A, the amount of air for controlling the internal pressure chamber R of the air spring A is also reduced, and the control can be performed easily. Become.

Further, by forming the cushioning member 8 acting as the displacement limiting mechanism L from an elastic body (for example, rubber, soft resin, etc.), the cushioning at the time of operation of the displacement limiting mechanism L can be softened and operated. It prevents the abnormal noise of time.

In the above description, a marine engine is taken as an example, but the present invention can be applied to a vibration isolation support device using an air spring, and is not limited to an engine or the like.

Further, according to the present invention, since it can be easily applied to a commercially available air spring, the commercially available air spring can greatly reduce the control power and easily perform displacement control as compared with the conventional air spring. be able to.

[0037]

According to the present invention, since the displacement limiting mechanism is provided in the internal pressure chamber of the air spring to greatly reduce the volume of the internal pressure chamber, the pressure control power of the internal pressure chamber can be reduced.

Further, by reducing the volume of the internal pressure chamber of the air spring, the spring constant of the air spring can be increased, which facilitates displacement control of the air spring.

Further, since the displacement limiting mechanism also serves as the volume reducing member of the air spring internal pressure chamber, the number of parts for fulfilling each function can be reduced, and the space can be effectively used.

Furthermore, when an elastic body is used for the displacement limiting mechanism, it is possible to prevent the generation of abnormal noise when the air spring comes into contact with the displacement limiting mechanism.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an air spring structure with a displacement limiting mechanism according to the present invention.

2 (a) and 2 (b) are conceptual diagrams showing the operation of the first embodiment.

FIG. 3 is a sectional view showing a second embodiment of an air spring structure with a displacement limiting mechanism according to the present invention.

FIG. 4 is a cross-sectional view showing a third embodiment of an air spring structure with a displacement limiting mechanism according to the present invention.

FIG. 5 is a cross-sectional view showing an outline of a vibration isolation support device such as a machine for implementing the air spring structure with a displacement limiting mechanism according to the present invention.

[Explanation of symbols]

 1 ... Installation base 2 ... Supported body 3,13,23 ... Lower face plate 13a, 23a ... Convex part 4 ... Upper face plate 5 ... Rubber bellow 6 ... Protrusion 7 ... Communication pipe 8,18,28 ... Cushioning member A ... Air spring B … Displacement L… Displacement limiting mechanism R… Internal pressure chamber

Claims (1)

[Scope of utility model registration request] 1. An air spring for supporting the supported body in a vibration-proof manner by adjusting the pressure of the internal pressure chamber so as to maintain the relative position to the installation base according to the displacement of the supported body. An air spring structure with a displacement limiting mechanism, wherein a displacement limiting mechanism for limiting the compression displacement of the air spring is provided, and the displacement limiting mechanism reduces the volume of the air spring internal pressure chamber.