JPH0131795Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a shock absorbing bushing for damping vibrations having an elastic body such as rubber between a rigid outer sleeve and a rigid pin or inner sleeve. This type of bushing is often used to dampen and eliminate vibrations by interposing it between the car body and the engine.
It has a well-known structure as disclosed in Japanese Patent Application Publication No. 2003-100000, and is shown in FIG. 3. This is because the elastic body 2, which is inserted under compression between the inner sleeve 1 and the outer sleeve 4, is positioned symmetrically in the diametrical direction of the outer peripheral surface with the recesses 9, 9 formed in a pair of parallel ends. The layer 11 for partitioning the recesses 9, 9, the cavities 10, 10, and the inner sleeve 1 is thin, which is not preferable in terms of mechanical strength. There are disadvantages in that the layer must be thick and the overall shape becomes large due to the presence of four recesses. Furthermore, no slippage occurs in the axial and circumferential directions between the outer circumferential surface other than the cavities 10 and 10 and the outer sleeve 4, and between the inner sleeve 1 and the circumferential surface of the central hole existing between the recesses 9 and 9. In order to
Another problem was that the elastic body 2 had to be compressed in the radial direction with a considerable compression force, making assembly difficult. Moreover, at the same time as the above-mentioned assembly process, the empty space 1
It is actually impossible to carry out the work of flowing liquid between 0 and 10, which complicates the assembly process, resulting in a high product cost. As mentioned above, the present invention was developed in view of the fact that conventional bushings have many practical problems. One purpose of the present invention is to provide a firm bushing for the Another object of the present invention is to simplify the manufacturing process by allowing assembly and fluid filling to be performed simultaneously. A further object of the present invention is to provide a block that reliably exhibits a blocking function against vibrations with large amplitudes occurring in the radial direction perpendicular to the axis, causing a rapid increase in rigidity and an increase in spring rate. It is to be one. In order to achieve the above-mentioned object, the present invention has a bushing having the configuration described below, and consists of a rigid pin or an inner sleeve, and a columnar structure surrounding the rigid pin or inner sleeve, which is integrally aligned in the axial direction. A buffer bushing is constructed of an elastic body, a rigid intermediate sleeve press-fitted around the elastic body, and a rigid outer sleeve fitted around the elastic body, and the elastic body has an outer circumferential surface. Each of the elastic blocks is surrounded by an annular groove recessed from the top and separated from the surrounding elastic material layer on the outer circumferential surface of the elastic block at symmetrical positions in the diametrical direction, and both ends are open to the outer circumferential surface of the elastic block, and at least one passage passing through the elastic material layer, and the intermediate sleeve has a diameter of the elastic block on a circumferential surface portion corresponding to the pair of elastic blocks. Each of the intermediate sleeves has a window that allows movement in the direction, and the inner wall surface of the intermediate sleeve is in close contact with the elastic body, and the outer sleeve has an expanded peripheral surface corresponding to the window. A bulge is provided that can be protruded to form a closed cavity on the outside of the window, and the bulge, the groove, and the passage are filled with liquid, 1 While having high vibration control characteristics in the radial and axial directions passing through the pair of bulges, it is possible to significantly increase the spring constant in the direction perpendicular to both the radial direction and the axial direction, and The length in the axial direction can be made shorter than in the radial direction, resulting in a compact structure, and the intended purpose can be fully achieved. Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings. The bushings shown in FIGS. 1 and 2 are usually placed in a connecting support portion between the engine and the vehicle body frame, with the axial direction held in a horizontal state. This bushing is the inner sleeve 1

The elastic body 2, the intermediate sleeve 3, and the outer sleeve 4 are used as constituent members (which may be replaced with pins), and are arranged concentrically from the inside in the order described. The inner sleeve 1 is made of a rigid cylinder such as a steel pipe,
It is attached to the engine by inserting a pin or bolt and fixing a U-shaped bracket provided at the base of the engine to the pin or bolt. The elastic body 2 is made of a highly elastic rubber material and is inserted between the inner sleeve 1 and the intermediate sleeve 3 with precompression in the radial direction. is firmly bonded by vulcanization adhesive means. The elastic body 2 has a pair of elastic blocks 5, 5 on its outer peripheral surface at diametrically symmetrical positions, and the illustrated example has a cubic block shape. These elastic blocks 5, 5 are formed at the same time when the elastic body 2 is molded, and are formed by forming square annular grooves 6 from the outer peripheral surface of the columnar elastic body 2. It is possible to easily provide a block separated from the elastic material layer. The elastic body 2, which integrally includes the pair of elastic blocks 5, 5, further opens on the outer circumferential surfaces of the elastic blocks 5, 5, and penetrates through the elastic material layer, avoiding the central portion where the inner sleeve 1 is located. Passage 7 to 1
article or more

[The example shown is 2 articles]. Next, the intermediate sleeve 3 is made of a rigid cylinder such as a thin-walled steel pipe, and the elastic body 2 is vulcanized and bonded to the inner surface of the cylinder, and a pair of elastic blocks 5, 5 are formed on the intermediate sleeve 3.
Windows 3a, 3a having similar openings slightly larger than the cross section of the elastic blocks 5, 3a, which can allow movement of the elastic blocks 5, 5 in the diametrical direction, are provided in the peripheral surface portions corresponding to the diaphragms 5, 5. There is. After arranging the intermediate sleeve 3 and the inner sleeve 1 concentrically so that their axial directions are aligned, an elastic body 2 of unvulcanized rubber is inserted between them, and then vulcanization is performed to separate the three members 1, 2 and 3 can be integrated into a columnar body, but this structure has a particularly low spring constant against the force that attempts to move the inner sleeve 1 in the radial direction connecting the pair of elastic blocks 5 and 5. be. On the other hand, like the intermediate sleeve 3, the outer sleeve 4 is formed from a rigid cylinder such as a thin-walled steel pipe, and has an inner diameter into which the intermediate sleeve 3 can be press-fitted. After assembly, the outer sleeve 4 has a corresponding circumferential surface portion which is the outer side of the windows 3a, 3a of the intermediate sleeve 3 and bulges outward to form a closed space on the outside of the windows 3a, 3a. There are bulges 8, 8 as shown in FIG. Then, the outer sleeve 4 and the intermediate sleeve 3 are press-fitted to form a cushioning bushing.
In this bushing, the bulges 8, 8, the grooves 6, 6, and the passage 7 are filled with a liquid, such as an inert liquid such as silicone oil or ethylene glycol, to complete the cushioning bushing. Next, to briefly explain the assembly procedure of the bushing, an unvulcanized elastic body 2 of a predetermined shape is compressed and inserted between the inner sleeve 1 and the intermediate sleeve 3, which are arranged concentrically, and then vulcanization is performed. one member 1,
Combine 2 and 3 into one. Assembly is easily accomplished by press-fitting this integral part and the outer sleeve 4; however, when the integral part and the outer sleeve 4 are press-fitted in an inert liquid phase, fluid filling is also possible at the same time. This is the preferred method. The bushing that has been assembled in this way is used as a vibration damping member between the vehicle body and the engine in the manner described above. The elastic body 2 has compressive elasticity and has the highest spring constant for vibrations in the direction perpendicular to the direction. On the other hand, the elastic body 2 has shear elasticity against vibrations in the axial direction, and has a spring constant that is considerably lower than the above-mentioned spring constant. Furthermore, in response to vibrations in the direction connecting the elastic blocks 5, 5, the elastic body 2 has a low spring constant because the elastic blocks 5, 5 move in the liquid in the cavity. At this time, as the elastic blocks 5, 5 move, the volume of the pair of spaces filled with fluid changes, with one space increasing and the other space decreasing, so that the liquid flows back and forth in the passage 7. During the reciprocating flow of the liquid, the passage 7 exerts a throttling action, resulting in a high damping ability against vibrations. Therefore, the elastic body 2 can enhance the vibration damping effect as well as the cushion performance. Next, the effects of the present invention are listed as follows. (a) The spring characteristics of the elastic body 2 provide a large vibration damping effect, and the constricting action of the passage 7 provides a high damping ability against vibrations. (b) The elastic body 2 has a layer 1 separated by a groove 6 in the layer.
Since it has a structure having a pair of elastic blocks 5, 5, it can be made into a more compact shape than a conventional bushing having four recesses, and moreover, it can be made into a form that is strong against shearing forces. (c) After integrating the inner sleeve 1, elastic body 2 and intermediate sleeve 3 during the vulcanization process of the elastic body 2,
Assembling is very simple since it is only necessary to fit the outer sleeve 4. Moreover, when fitting the outer sleeve 4 into the sleeve 4, if it is carried out in the liquid phase, filling of the liquid can be carried out simultaneously, and the assembly process is greatly simplified compared to the conventional method.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a sectional front view and a plan view of an example of the bushing of the present invention, and FIG. 3 is a sectional view of a conventional bushing. 1... Inner sleeve, 2... Elastic body, 3... Intermediate sleeve, 3a... Window, 4... Outer sleeve,
5...Elastic block, 6...Groove, 7...Passway, 8
...Bulge.

Claims (1)

[Scope of utility model registration request] A rigid pin or inner sleeve 1, a columnar elastic body 2 integrally surrounding the pin with its axial direction aligned, a rigid intermediate sleeve 3 press-fitted around the elastic body 2, and further fitted around it. The elastic body 2 has an elastic block 5 surrounded by an annular groove 6 recessed from its outer peripheral surface and separated from the surrounding elastic material layer at diametrically symmetrical positions. The intermediate sleeve 3 has a pair of passages 7 on the outer circumferential surfaces of the elastic blocks 5, 5, and at least one passage 7 that is open at both ends to the outer circumferential surfaces of the elastic blocks 5, 5 and that penetrates through the elastic material layer. Windows 3a, 3a are opened in the peripheral surface portions corresponding to the elastic blocks 5, 5, respectively, to allow movement of the elastic blocks 5, 5 in the diametrical direction, and the inner wall surfaces are brought into close contact with the elastic body 2. The outer sleeve 4 has a peripheral surface portion corresponding to the window portions 3a, 3a bulged to form bulges 8, 8 that can form a closed space outside the window portions 3a, 3a. , the bulges 8, 8, the grooves 6, 6 and the passage 7
A cushioning bushing characterized by filling the inside with a liquid.