JPS629039A - Suspension bush - Google Patents

Abstract

PURPOSE:To prevent deformation of the sectional shape of a flow passage and to enable easy alteration of the length of an orifice, by a method wherein hollow chambers are intercommunicated through a rigid communicating pipe mounted along the inner peripheral surface of an outer cylinder metal or the outer peripheral surface of an inner cylinder metal. CONSTITUTION:A rubber resilient ring 3 is located between an inner cylinder metal 1 and an outer cylinder metal 2, plural individual hollow chambers 4 and 5, communicated with each other, are formed in the rubber ring 3, and the hollow chambers 4 and 5 are sealed with given fluid. A communicating pipe 6, formed with a circular ring situated concentrically to the inner cylinder metal 1, is mounted to the rubber resilient ring 3 in a manner that it is half- buried in the rubber resilient ring, and holes 7 and 8, serving to intercommunicate the hollow chambers 4 and 5 and the communicating pipe 6, are formed in the portions, present in the hollow chambers 4 and 5, respectively, of the cummunicating pipe 6.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a rubber elastic ring interposed between an inner cylindrical metal fitting and an outer cylindrical metal fitting. ! This invention relates to a suspension bushing in which separate hollow holes that communicate with each other are provided and a predetermined fluid is injected into these hollow holes.

[Conventional technology]

As shown in FIG. 13, a conventional suspension bushing has a rubber elastic ring 3 interposed between an inner cylinder fitting 1 and an outer cylinder fitting 2, and a plurality of separate hollow holes in the rubber elastic ring 3 that communicate with each other. Chambers 4 and 5 are provided, and a predetermined fluid is sealed in these hollow chambers 4.5. And a plurality of hollow chambers 4, 5
In the method shown in FIG. 13, a part of the outer circumferential surface of the inner cylinder fitting 1 is cut into a stepped shape to form a flow path 100.
A communication path 102 is formed in the rubber elastic ring 3 to communicate the flow path 100 with each hollow chamber 4.5.

In addition, as a means of communicating each hollow chamber 4.5,
As shown in FIG.
It is also known that an inner sleeve 103 is provided.

(Problems to be Solved) In the conventional example shown in FIG. 12, rubber flows into the communication path 102 toward the hollow chambers 4 and 5, and there is a problem that finishing after vulcanization is troublesome.

In the conventional example shown in FIG.
There was a drawback that deformation of the cross-sectional shape occurred. In addition, in both conventional examples, the orifice length is fixed, so in order to make it variable, it was necessary to significantly change the shape of the metal fitting.

Therefore, the present invention can prevent rubber from flowing into the communication channel flow path, prevent deformation of the cross-sectional shape of the flow path,
The purpose of the present invention is to provide a suspension bushing whose orifice length can be easily changed and which increases the degree of freedom in design.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention installs a rigid encountering pipe along the inner circumferential surface of the outer cylindrical fitting or the outer circumferential surface of the inner cylindrical fitting so as to extend between each hollow chamber of the communicating tube. A hole is formed in the portion existing in the chamber to allow the hollow chamber and the communication pipe to communicate with each other.

[Effect]

In this invention, a plurality of hollow chambers provided in the rubber elastic ring are filled with a predetermined fluid, and these hollow chambers are communicated through a communication pipe, so that when the vibration is excited, one of the hollow chambers is filled with a predetermined fluid. The resistance generated when the fluid flows through the communication tube into the other hollow chamber provides a good damping effect. In addition, the length of the communication pipe between the hollow chambers can be easily designed to the desired length, and by changing the design of the orifice length and orifice diameter, a suspension bushing with a damping effect according to the application can be easily removed. becomes possible.

(Embodiments) Some preferred embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIG. 1, a rubber elastic ring 3 is interposed between an inner cylindrical metal fitting 1 and an outer cylindrical metal fitting 2, and the rubber elastic ring 3 has a plurality of separate hollow chambers 4.5 that communicate with each other. are provided, and a predetermined fluid is sealed in these hollows v4 and v5.

In the first embodiment, the means for making the hollow chambers 4.5 communicate with each other is a communication ring that is concentric with the inner cylinder fitting 1! The F6 is installed by being partially buried in the rubber elastic ring 3. Holes 7 and 8 are formed in the portions of the rigid communicating tube 6 that are present in each hollow chamber 4.5 for communicating the hollow chamber 4.5 and the communicating tube 6. Communication! ! 6 is a circular tube made of a metal material and has a hollow part serving as an orifice passage inside;
IXl sulfur is integrated into the rubber elastic ring 3. By vulcanizing and integrating the communication pipe 6 with the rubber elastic ring 3, leakage of fluid from the orifice passage, that is, the inside of the communication pipe 6 is prevented. Roughly speaking, the advantage of the communication pipe 6 being integrated with the rubber elastic ring 3 is that when the suspension bushing is at its maximum deflection, the rubber elastic ring 3
When the connecting tube 6 is deformed, the communicating tube 6 is partially surrounded by the rubber elastic ring 3, so that the communicating tube 6 is prevented from being damaged. The fluid is sealed in the hollow chamber 4.5 by applying a caulking force from the outer cylindrical fitting 2 to give residual compression to the rubber elastic rM3, and then injecting fluid from a part of the outer periphery of the outer cylindrical fitting 2. It is sufficient to remove the inlet, fit the injection port 119, and perform low-temperature brazing. To manufacture the suspension bushing of the first embodiment, the inner cylindrical fitting 1 is set in a vulcanization mold, and the holes 7 and 8 are plugged in a part of the core mold for forming the hollow chamber 4.5. The connecting pipe 6 is set in a vulcanization mold using a core mold, and the rubber elastic ring 3 is vulcanized and molded by vulcanizing the rubber, thereby forming the rubber elastic ring 3 and the inner cylindrical metal fitting. 1, the rubber elastic ring 3, and the communication pipe 6 are vulcanized and integrated. If the core mold is removed after vulcanization molding, the holes 7 and 8 remain unblocked, and the hollow π4.
5 is formed. Seal color 1 during rubber vulcanization molding
By setting 0 in the vulcanization mold, the rubber elastic ring 3 and the seal collar 10 can be vulcanized and integrated. Next, by press-fitting the outer cylindrical metal fitting 2, the suspension bushing shown in FIG. 1 can be manufactured. Furthermore, if the above-mentioned fluid sealing means is applied, it is possible to draw the outer cylindrical fitting as a technique for imparting durability to the flexible deformation of the rubber elastic ring 3 after assembling the bushing. Since the injection port cover 9 is then fitted to the outer cylinder fitting 2 by low-temperature brazing, liquid leakage during the manufacturing process can be prevented.

In the first embodiment, communication! 6 is constructed from a circular ring concentric with the inner cylinder fitting 1, but an elliptical ring may also be used.

In the case of a freewheel, it may be brought into contact with the inner cylindrical metal fitting 1 and the outer cylindrical metal fitting 2 for positioning.

In the second embodiment shown in FIGS. 2 and 3, the communication pipe 6 is attached to the inner circumferential surface of the outer cylindrical fitting 2 in contact with it.

In the first and second embodiments, seal collars 10 are provided on both sides of the external fitting 2, into which O-rings 11 are inserted.

As the communication pipe 6, a spiral-shaped pipe as shown in FIG. 4 can also be used. This spiral-shaped communication pipe 6 may be vulcanized and integrated with the rubber elastic ring 3 as in the first embodiment, or it may be fixed to the inner circumferential surface of the outer cylindrical fitting 2 as shown in the second embodiment. good. Of course, both ends of this spiral communication tube 6 are closed. With the spiral-shaped communication pipe 6, it is naturally possible to lengthen the orifice passage.

5 and 6 show an example of means for injecting fluid into the cavity 4.5.

This is achieved by attaching a nut 13 to the outer fitting 2 using a jig 12, and attaching a check valve (not shown) to this nut 13, so that fluid can be supplied from the fluid injection pump to the hollow chamber 4.5.
It becomes possible to inject into

Conventional fluid encapsulation, such as liquid, involves encapsulating the liquid in a liquid tank.
In order to impart vibration characteristics to the bushing, a processing step was required to compress and deform the outer periphery of the outer cylindrical fitting 2 after filling the liquid to apply hydraulic pressure to the sealed liquid. Increasing the hydraulic pressure by plastically deforming the metal body of the external fitting 2 has been an extremely troublesome task. This processing method, which is called drawing of the outer cylindrical metal fitting 2, has the disadvantage that if the diameter of the outer cylindrical metal fitting 2 cannot be reduced on an average basis, aPJ of the enclosed liquid may occur. When this nut 13 is attached to the outer cylinder fitting 2,
The conventional troublesome work is no longer necessary, and the construction method called drawing of the outer cylindrical metal fitting 2 is no longer required.

Further, when fluid is injected into the hollow π4.5 through the nut 13, it is possible not only to fill the hollow chamber 4.5 with the fluid but also to adjust the amount of the fluid. Adjusting the amount of fluid to be injected is effective in the case of a configuration that allows fluid to flow in and out between the hollow chamber 4.5 and the outside (as shown in the embodiment shown in FIG. 7 and below).

In a third embodiment of the present invention shown in FIG. 7, a link rod 14 is fixed to a suspension bush, and the link rod 1
A hydraulic fluid chamber 15 is formed within the bushing 4, and this hydraulic fluid chamber 15 and the hollow chambers 4 and 5 within the bushing are communicated via a communicating pipe 6 and a piston rod 18, which will be described later. An outer sleeve 16 is fitted onto the outside of the outer cylinder fitting 2, and one end of the link rod 14 is fixed to the outer sleeve 16. A piston 17 and a piston rod 1 are contained in the link rod 14.
8 is slidably provided. The tip of the piston rod 18 protrudes into the hollow chamber 4, and the communication pipe 6 is attached to the tip. Possible 1F8M on the top of piston 17! A fixed partition wall 20 is provided above the flexible membrane 19. A variable volume gas chamber 21 is formed between the flexible membrane 19 and the fixed gap W20. The piston 17 has an orifice hole 22 formed therein. Reference numeral 23 is a stopper at the bottom dead center of the piston 17. The communication pipe 6 is connected to the inner cylinder fitting 1
It is attached loosely to the outer periphery of the This communication pipe 6 allows the hollow chambers 4.5 to communicate with each other, and also communicates with the hydraulic fluid chamber 15 through the interior of the piston rod 18 (piston rod replacement passage 24 shown in FIG. 8). In this third embodiment, a mechanism having a piston rod 18 is added by utilizing the hollow portion of the link rod 14 when assembling the rubber bush. As a result, the amount of hydraulic fluid can be increased considerably, and in addition, the flexible membrane 19 (free piston)
It is now possible to use gas pressure as well. In this third embodiment, the thermal energy accumulated inside the rubber bushing can be dissipated to the link rod 14, and the increase in the reaction force of the link rod 14 enclosing the rubber bushing can be automatically gradually reduced. can. Further, since the communicating tube 6 is M-fitted into the inner tube fitting 1, the inner tube fitting 1 can move freely within a certain range within the communicating tube 6.

A fourth embodiment of the invention shown in FIGS.
This embodiment is almost the same as the embodiment, but the difference is that the biton rod replacement flow path 24 is clearly shown in the drawing, and the means for attaching the communication pipe 6 to one end of the piston rod 18 is different. In this embodiment, a clamping tool 25 having an arcuate curved surface is attached to the tip of the piston rod 18, and the communicating tube 6 is clamped by the clamping tool 25. Since the communicating tube 6 is held by the holding tool 25 having an arcuate curved surface, the inner cylinder fitting 1 can be freely moved at the angle shown by θ in FIG. Further, with this configuration, the inner cylindrical metal fitting 1 can also be tilted as shown by the imaginary line in FIG.

FIG. 10 shows the configuration of a piston rod 18 with a rubber 18A bonded to its tip side and a synthetic resin material 1 attached to the tip of the rubber 18A.
8B is shown attached. The presence of the rubber 18A allows the piston rod 18 to be compressed in the axial direction. This allows the inner cylinder fitting 1 to tilt, and also allows the inner cylinder fitting 1 to tilt.
Vertical movement of is also permissible within a certain range.

FIG. 11 explains the flow of hydraulic fluid in the third and fourth embodiments.

〔effect〕

As explained above, according to the present invention, a rigid communication pipe is attached along the inner circumferential surface of the outer metal fitting or the outer circumferential surface of the inner cylinder fitting so as to extend between the hollow chambers, and the rigid communication pipe is attached to each hollow chamber of the communication pipe. Since a hole is formed in the existing part to communicate between the hollow hole and the communication pipe, it is possible to change the orifice length and orifice diameter formed in the communication pipe, and the orifice length and orifice diameter can be optimized depending on the application. It can be designed into anything.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a preferred embodiment of the present invention, Fig. 2 is a cross-sectional view showing a second embodiment, Fig. 3 is a cross-sectional view taken along line mm in Fig. 2, and Fig. 4 is a sectional view of a communicating pipe. A perspective view showing a modification, FIGS. 5 and 6 are cross-sectional views showing an example of a means for injecting fluid into the hollow 7, and FIG. FIG. 8 is a sectional view showing a fourth embodiment of the present invention, FIG. 9 is a central sectional view of FIG. 8, and FIG. 10 is a front view showing a modification of the piston rod. FIG. 11 is a sectional view for explaining the flow of fluid in the third and fourth embodiments, and FIG.
FIG. 2 is a sectional view showing a conventional example, and FIG. 13 is a sectional view showing another conventional example. 1... Inner cylinder metal fitting, 2... Outer cylinder metal fitting, 3... Rubber elastic ring, 4.5... Hollow chamber, 6... ...Communication pipe, 7.8...hole. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo Figure 2 Figure 3 Figure 8 Figure 9r! A o″″′-5 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1. A rubber elastic ring is interposed between the inner cylindrical metal fitting and the outer cylindrical metal fitting, and a plurality of separate hollow chambers communicating with each other are provided in the rubber elastic ring, and a predetermined fluid is filled in these hollow chambers. In a suspension bush injected with A suspension bush characterized in that a hole is formed to communicate between a hollow chamber and a communication pipe.