JPH0427739Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an assembly device for vibration-proof rubber, and more specifically, an annular rubber elastic body is press-fitted between an outer cylinder and a core body to assemble the three parts. Regarding equipment.

(Prior art) In a railway vehicle, an annular rubber elastic body is press-fitted in the axial direction between an outer cylinder and a core body located at the center of the outer cylinder as an axle spring for vibration-isolating support of an axle box. A vibration isolating rubber is used in which the rubber elastic body is sandwiched in the axial direction by compressed surfaces formed on the inner circumferential surface of the outer cylinder and the outer circumferential surface of the core body, respectively.

Conventionally, this anti-vibration rubber is made by attaching a press-fitting liquid to the surface of an annular rubber elastic body, and using the lubricating action of the press-fitting liquid to slide between the outer cylinder and the core body and pushing it into a predetermined position. However, in this case, the surface of the rubber elastic body does not always slide evenly on the outer or inner surfaces of the outer cylinder and core, and as a result, stress may be concentrated in some areas. This may cause wrinkles or wrinkles to appear.
If such stress concentration or wrinkles occur, cracks are likely to occur in these areas, which may shorten the life of the vibration isolating rubber. In addition, in such anti-vibration rubber, the press-fitted rubber elastic body remains in a rather unstable state, and during use, this rubber elastic body tries to reach a stable state, causing slippage. As a result, the dimensions of the anti-vibration rubber change significantly and the spring characteristics change, resulting in problems such as uneven characteristics of each anti-vibration rubber.

(Means for Solving the Problems) These problems arise because the annular rubber elastic body is press-fitted into the outer cylinder and the core body while sliding them. On the other hand, if the rubber elastic body is press-fitted to the assembly position while being rotated relative to the outer cylinder and core body in the axial direction, all of the above problems can be solved. Therefore, the present applicant proposed such an assembly method, specifically, moving the outer cylinder and the core located at the center thereof relative to each other in the axial direction from a position a certain distance away from the assembly position to the assembly position. At that time, a separate application was filed for a method in which an annular rubber elastic body set between the two is compressed by the outer cylinder and core body in the direction perpendicular to the axis, rotated, and press-fitted to the assembly position.

The invention of the present application was made for the purpose of providing an assembly device capable of implementing such a method, and the gist of such an assembly device is (a) the above-mentioned outer cylinder and An outer cylinder holding means and a core holding means that hold the core so as to be relatively movable in the axial direction;
(B) A guide cylinder and a guide rod that are positioned continuously on the front end side of the outer cylinder and the core in the direction of relative movement of the outer cylinder and the core, and that guide the rubber elastic body when it is press-fitted. and (c) assembling the outer cylinder and guide cylinder and the core body and guide rod by pressurizing them in the axial direction and in the opposite direction and moving them relative to each other while at the same time rotating the rubber elastic body set between them. and a pressurizing means for moving it to the attached position.

(Function) In the assembly device of the present invention, the outer cylinder and the core body are positioned a certain distance apart from the assembly position, and the guide cylinder and the guide rod are connected to each front end side, and an annular shape is formed between them. When the rubber elastic body is set, and in this state the outer cylinder, guide tube, guide rod, and core are moved relative to each other in the axial direction by a pressurizing means, the rubber elastic body is compressed at right angles to the axis. At the same time, it rotates in the axial direction based on opposing forces applied to its inner and outer circumferential surfaces. Therefore, by stopping the movement of the rubber elastic body after exactly a whole number of rotations and placing it in the assembly position, and removing the guide cylinder and guide rod, an assembled body of the outer cylinder, the rubber elastic body, and the core body, that is, the vibration-proof rubber can be obtained. It will be done.

In the vibration-proof rubber thus obtained,
There are no stress concentration points or wrinkles that can cause cracks in the contact area of the rubber elastic body with the outer cylinder or core body, and the rubber elastic body stays in the assembled position in a stable state, so there is no possibility of large dimensional changes or wrinkles during use. No change in characteristics occurs.

By the way, the rubber elastic body that is press-fitted between the outer cylinder and the core body becomes stable in shape when it is rotated exactly a whole number of times from the initial set position. Since a rod is used to guide the press-fitting of the rubber elastic body, the amount of rotation of the rubber elastic body can be controlled regardless of the length of the outer cylinder and core in the axial direction. Depending on the condition, the rubber elastic body can be rotated just an integer number of times until it reaches the assembly position, and the rubber elastic body can be held in a stable state.

(Example) Next, an example in which the present invention is applied to a vibration-proof rubber assembly device for supporting an axle box of a railway vehicle will be described in detail with reference to the drawings.

FIG. 2 shows the structure of the anti-vibration rubber, and FIG. 4 shows the anti-vibration rubber incorporated as part of the support device for the axle box. In these figures, 10 and 12 are the wheels and truck frame of the railway vehicle (bogie), and 14 is an axle box. This axle box 14 is connected to the truck frame 12 via a vibration-proof rubber 16 serving as an axle spring. That is, an arm 18 extends from the axle box 14, and this arm 18 is fixed to the core body 24 of the anti-vibration rubber 16, while an outer cylinder 22 of the anti-vibration rubber 16 is fixed to the truck frame 12, and the axle box 14 and the truck frame 12 are connected.

The anti-vibration rubber 16 is arranged between a metal bottomed cylindrical outer cylinder 22 as shown in FIG. 2 and a metal core 24, the original shape of which has a circular cross section as shown in FIG. In addition, a ring-shaped rubber elastic body 26 (for example, cross-sectional diameter: 90 mmφ, outer diameter: 250 mmφ, inner diameter: 70 mmφ) is press-fitted, and such rubber elastic body 26
is deformed in the axial direction and radial direction (direction perpendicular to the axis), the relative displacement in the axial direction and radial direction between the outer cylinder 22 and the core body 24, that is, the relative displacement between the axle box 14 and the bogie frame 12, is It is becoming absorbed.

The core body 24 includes a shaft-shaped portion 30 having an outer circumferential surface (press-fitting surface) extending straight in the axial direction, a bell-shaped main body 32, and a male threaded portion 34 extending from the main body 32. ing. On the other hand, the outer cylinder 22 has a thin wall portion 25 with an inner circumferential surface (press-fitting surface) extending substantially straight in the axial direction, and a slope 28 formed continuously on the inner circumferential surface. The rubber elastic body 2 is formed by the slope 28 and the slope 36 of the core body 24.
6 in the axial direction. The male threaded portion 34 is a connection portion to the axle box 14 as described above, and the nut 20 (FIG. 4) is tightened here.

In the vibration isolating rubber 16 of this example, the outer circumferential surface of the core body 24 and the inner circumferential surface of the outer cylinder 22 have a width of 2.7 mm and a depth of 2.7 mm.
A large number of grooves extending in the circumferential direction are formed with a pitch of about 1.3 mm and a pitch of 3 mm, and the uneven portions 38 and 40 are constituted by these grooves. These uneven portions 38 and 40 prevent relative slippage between the rubber elastic body 26 and the core body 24 or the outer cylinder 22 in the axial direction.

This anti-vibration rubber 16 is constructed by press-fitting a rubber elastic body 26 between an outer cylinder 22 and a core body 24 while rotating the rubber elastic body 26 in the axial direction, and assembling the three members. The specific configuration of is shown. In this figure, reference numeral 44 denotes a machine frame, which has an upper plate 46, a lower plate 48, and a side plate 50. A frame 54 with a through hole 52 is installed on the lower plate 48, and an outer cylinder 22 is mounted on the upper surface of the frame 54.
is starting to be placed.

Reference numeral 56 denotes a guide cylinder that is disposed continuously and above the outer cylinder 22, and is constructed integrally with the movable plate 58. The movable plate 58 is connected to the cylinder 62 on the upper plate 46.
The movable plate 58 is moved up and down together with the rod 60, and the guide tube 56 is connected to or separated from the outer tube 22 by raising and lowering the movable plate 58.

On the other hand, a hydraulic cylinder 64 for setting the core body 24 at the center of the outer cylinder 22 is provided at the center of the upper surface of the upper plate 46, and a rod 66 extending downward from the cylinder 64 has its core attached to the tip. The body 24 is screwed and fixed. In FIG. 1, the member indicated by the reference numeral 68 on the lower side of the core body 24 is a guide rod, which guides the rubber elastic body 26 together with the guide tube 56 when the rubber elastic body 26 is press-fitted. The upper end of this guide rod 68 is in contact with the lower end of the core body 24, and alignment in the direction perpendicular to the axis is achieved by fitting. The inner diameter of the guide tube 56 is made equal to the inner diameter of the upper part of the outer tube 22, and the upper part of the guide rod 68 has the same thickness as the shaft-like part 30 of the core body 24, while the lower part has a larger diameter. , the middle part is the gradual variation part. These guide tubes 56
A large number of grooves extending in the circumferential direction are formed on the inner and outer surfaces of the guide tube 56 and the guide rod 68, respectively.
It is designed to prevent slippage from occurring.

The procedure for press-fitting the rubber elastic body 26 using the apparatus of this example is as follows. That is, as shown in FIG. 1, after the outer cylinder 22 is set on the pedestal 54, the movable plate 58 is lowered to move the guide cylinder 56 onto the outer cylinder 2.
2, the rod 66 of the hydraulic cylinder 64 is retracted to raise the core body 24, and in this state, the ring-shaped rubber elastic body 26 in a free state is first set on the upper part of the guide tube 56. do.
Next, while holding the guide rod 68 in your hand, insert its lower tip into the upper inner circumference of the rubber elastic body 26.

Next, when the rod 66 is pushed out and the core body 24 is lowered, the lower end of the core body 24 fits and contacts the upper end of the guide rod 68 at a certain position, and the guide rod 68 is pushed downward. As a result, the rubber elastic body 26 moves to the guide rod 68.
While being compressed in the radial direction by the guide rod 68 and the guide tube 56, it rotates downward based on the relative movement of the guide rod 68 and the guide tube 56 in the axial direction. Then, when the rotation phase is the same as the initial free state after exactly one rotation, the center position in the axial direction matches the center position in the axial direction of the shaft-like part 30 of the core body and the thin-walled part 25 of the outer cylinder 22. , and the outer cylinder 22 and the core body 24
It is in a state where it is just in contact with the slopes 28, 36 of. In other words, the rubber elastic body 26 is stably housed in the assembly position (the guide rod 68 and the guide cylinder 56
The length of is pre-selected as such. ) At this time, the guide rod 68 protrudes downward from the through hole 52 of the pedestal 54, separates from the core body 24, and falls freely.

Now, when the rubber elastic body 26 is in a predetermined position, the rod 66 is rotated with a tool such as a spanner to unscrew the core body 24 and the rod 66.
Next, the guide tube 56 is raised together with the movable plate 58, and the vibration isolating rubber 1 is assembled into the state shown in FIG.
Take out 6.

Although the embodiments of the present invention have been described in detail above, the present invention can be configured in other forms.

For example, in the above example, the guide tube 56 is held by the movable plate 58 and moved up and down, but the guide tube 56 is separated from the movable plate 58 and manually placed on the upper side of the outer tube 22. Alternatively, the guide rod 68 can be detachably connected to the lower end of the core body 24 by a predetermined connecting means. Furthermore, it is of course possible to appropriately change the shape and length of the guide tube and guide rod depending on the cross-sectional shape, cross-sectional diameter, etc. of the rubber elastic body, such as configuring the guide tube in a hollow shape.

Furthermore, in the above example, the core body and guide rod side are moved, but it is also possible to move the outer cylinder and guide cylinder side, or to move both at the same time. , it is also possible to relatively move these not in the vertical direction but in the lateral direction, and it is also possible to use something other than the above-mentioned hydraulic cylinder, mount, etc. as a pressurizing means, etc., within the scope of the present invention. It can be configured with various modifications based on the knowledge of the vendor.

(Effects of the Invention) As described above in detail, by using the device of the present invention, it is possible to easily press-fit the rubber elastic body to the assembly position while rotating it.

In a vibration isolating rubber made by press-fitting a rubber elastic body using such a device, stress concentration points and wrinkles do not occur on the surface of the rubber elastic body, thereby improving the life of the rubber elastic body. In addition, according to the device of the present invention, the rubber elastic body can be smoothly press-fitted to the assembly position by the action of the guide tube and guide rod, and by appropriately selecting the lengths of these guide rods and guide tubes, the rubber elastic body can be pressed in smoothly. Since the body can be kept in a stable shape, the anti-vibration rubber will not change in dimensions or properties during use.

[Brief explanation of the drawing]

FIG. 1 is a front view (partially sectional view) of an assembling device which is an embodiment of the present invention, and FIG. 2 is a front sectional view of a rubber vibration isolator to which the assembling device is applied. Figure 3 is a sectional view showing the original shape of the rubber elastic body shown in Figure 2 before press-fitting, and Figure 4 is a cross-sectional view showing the rubber elastic body shown in Figure 2 as part of an axle box support device for a railway vehicle (bogie). FIG. 3 is a front view of main parts in an assembled state. 16... Anti-vibration rubber, 22... Outer cylinder, 24... Core body, 26... Rubber elastic body, 54... Frame, 56...
... Guide tube, 58 ... Movable plate, 60, 66 ... Rod, 64 ... Hydraulic cylinder, 68 ... Guide rod.

Claims (1)

[Claims for Utility Model Registration] An outer cylinder, which is a structure of vibration-proof rubber, and a core located at the center of the outer cylinder are relative to each other in the axial direction from a certain distance away from the assembly position to the assembly position. At that time, the annular rubber elastic body set between the two is compressed in the direction perpendicular to the axis by the outer cylinder and core, and is moved in the axial direction from the initial free state to the final assembly position, which is an integral number of rotations. Rotate and press fit,
an outer cylinder holding means and a core holding means for integrally assembling the outer cylinder, the core body, and the rubber elastic body, and holding the outer cylinder and the core body so as to be relatively movable in the axial direction; a guide cylinder and a guide rod that are positioned continuously on the front end sides of the outer cylinder and the core in the direction of relative movement of the outer cylinder and the core, and that guide the rubber elastic body when press-fitting; Pressure is applied to the outer cylinder and guide cylinder and the core body and guide rod in the axial direction and in the opposite direction to move them relative to each other, and at the same time, the rubber elastic body set between them is rotated and moved to the assembly position. An assembling device for vibration isolating rubber for a railway vehicle, comprising: a pressure means;