JPH0788868B2 - Viscous fluid filled damper and its mounting structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a viscous fluid-sealed damper having a viscous fluid sealed therein.

(Background of the Invention) When a CD player is mounted on a vehicle or the like, conventionally, as shown in FIG. 3 (A), in order to prevent vibration of the vehicle from being transmitted to the CD player as it is and causing skipping. A viscous fluid-sealed damper 102 is interposed between the CD player 100 and the support member 101. Here, the viscous fluid-sealed damper 102 is of a form in which a highly viscous fluid is sealed inside the container, and a structure as shown in FIG. 3 (B) is considered as a mounting structure of the damper to the support member. In the figure, 102 is a damper made entirely of a rubber material, which has a container-like shape and has a high-viscosity fluid 103 inside.
Is enclosed. This damper 102 is a highly viscous fluid 103.
It has an agitating portion 104 that projects into the interior, a thin flexible portion 106 that elastically supports the agitating portion 104 at the base end in a floating state, and a cylindrical peripheral wall portion 108. The stirring portion 104 is provided with a fitting hole portion 110, into which a shaft member of a supporting member or a supported member is fitted. And this stirring unit 104
And the highly viscous fluid 103 is agitated based on the relative displacement with the main body side including the peripheral wall portion 108 and the like, so that the transmission of vibration from the supporting member to the supported member is absorbed by energy absorption at that time. Has become.

This damper 102 has a short flange 116 at the base end opposite to the flexible portion 106, and the upper surface 118 of this flange 116 has a stepped portion of a resin holder (mounting member) 120.
It is held down by 122. That is, the flexible portion 1
The upper surface 118 of the flange 116 with the end surface 112 on the opposite side of 06 seated on the mounting surface 114 of the supported member or the supporting member.
Is pressed against the mounting surface 114 side by the holder 120 and is fixed to the mounting surface 114 via the holder 120.

(Problems to be Solved by the Invention) In this damper 102, it is necessary to support the stirring portion 104 softly in the flexible portion 106. Therefore, conventionally, an extremely soft material having a hardness of about 20 to 30 degrees is used as a rubber material. Was used.

However, when the damper 102 is formed of such a soft material, the flange 116 and the peripheral wall portion 108 naturally become soft, which causes the following problems.

That is, since the flange 116 is soft, the flange 116 is easily deformed when vibration or shock is input in the above mounting structure,
Further, although the peripheral wall portion 108 is also restrained to some extent by the cylindrical portion 121 of the holder 120, it is likely to be deformed in the direction away from the inner surface of the cylindrical portion 121 (the arrow P direction in the drawing), and therefore the stirring portion 104 and the peripheral wall portion. The relative displacement with respect to 108 and the flow of the high-viscosity fluid 103 based on this displacement do not sufficiently occur, resulting in a problem that a large damping force cannot be obtained.

Therefore, only when a particularly large damping force is required, the peripheral wall portion 108 and the peripheral wall portion 121 of the holder 120 are fixed to each other with an adhesive, but in this case, the mounting process of the damper 102 is complicated. And increase the cost.

(Means for Solving the Problem) The present invention has been made to solve such a problem, and its gist is a hollow shaft-shaped portion coupled to a supporting member or a supported member, A viscous fluid-sealed damper having a stirring portion that rushes into a viscous fluid sealed inside a container, a peripheral wall portion surrounding the stirring portion, and a thin-walled flexible portion that elastically supports the stirring portion in a floating state. When mounting the viscous fluid-sealed damper by pressing and fixing the end face on the side opposite to the flexible part on the mounting surface of the supported member or the mounting surface of the supporting member by pressing and fixing it on the mounting surface, While forming a pressed surface on the outer peripheral surface of the peripheral wall portion at a position farther from the mounting surface than the tip position of the stirring portion that rushes into the viscous fluid, forming a pressing surface on the mounting member at a corresponding position, Pressed by the pressing surface The surface is pressed and fixed to the mounting surface side.

(Operation and Effect of the Invention) In the mounting structure shown in FIG. 3, the peripheral wall portion is deformed together with the displacement of the stirring portion because the damper fixing position (pressed surface position) is close to the mating mounting surface. Due to being in position. The present invention has been made with this in mind, and the pressed surface of the damper is formed at a position farther from the mounting surface than the position of the tip of the agitating portion, and this is attached to the mounting surface side by the mounting member. It is designed to be pressed and fixed against.

By doing so, the part farther from the base end of the mounting surface side of the damper, specifically, the part farther from the tip of the stirring section, is the mating surface of the mating member and the pressing surface of the mounting member. It is firmly sandwiched between and and firmly fixed. Therefore, it is possible to effectively suppress the deformation of the peripheral wall portion when the stirring portion is about to be displaced during the input of vibration or shock. As a result, the viscous fluid is sufficiently stirred and flowed, and a large damping force can be obtained.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 1, 10 is a viscous fluid-filled damper in the form of a closed container, which is entirely made of a rubber material, and 12 is a highly viscous fluid enclosed inside. The damper 10 includes a fitting hole portion 14 into which a shaft of a supporting member or a supported member is fitted, and a stirring portion 16 in a form of being projected into the highly viscous fluid 12, a cylindrical peripheral wall portion 18, and a stirring portion. 16 and the peripheral wall portion 18 are connected and the stirring portion 16
It has a thin pleated flexible portion 20 for elastically supporting the floating state, and a bottom portion 22 which is separate from the peripheral wall portion 18 and fixed to the peripheral wall portion 18 with an adhesive.

As is clear from a comparison with FIG. 3B, the peripheral wall portion 18 is almost entirely thick, and the pressed surface 26 that is pressed by the resin holder 28 at a predetermined height position thereof. Are formed substantially parallel to the back surface of the bottom portion 22 and over the entire circumference of the peripheral wall portion 18.

The holder 28 is a member for attaching the damper 10 to a supported member or a supporting member, and has a cylindrical main body portion 29 fitted with the outer peripheral surface of the peripheral wall portion 18 with substantially no gap, and a lower end and an upper end of the main body portion 29. The outward flange and the inward flange are formed, and the inward flange serves as the pressing portion 32, and the outward flange serves as the fixing portion 30 to the other side.

FIG. 1 (B) shows a state in which the damper 10 is attached to the other side. As shown, this damper 10 has a bottom 22
From the back surface of the peripheral wall portion 18 to the pressed surface 26 of the peripheral wall portion, that is, the portion from the bottom rear surface to the height H at the peripheral wall portion (however, the height in the mounted state) is the tightening margin d (Fig. 1 (A)). It is compressed by the holder 28 and is attached in such a state that the bottom back surface 24 is seated on the mating mounting surface 25 in that state. Here, the height H is set to be larger than the height h of the tip of the stirring section.

Note that the damper 10 of this example is different from the conventional fixing method in the flange in that the stepped portion formed on the peripheral wall portion 18, that is, the peripheral wall portion 18
Although the shoulder part of the
It can be considered that the height of the conventional flange is moved to the high position as it is.

In any case, in this example, the pressed surface 26 of the peripheral wall portion 18 formed at a position higher than the tip of the stirring portion 16, that is, at a position further away from the mounting surface 25, is formed at a corresponding height position of the holder 28. The damper 10 is pressed by the pressing surface 33, and the damper 10 is sandwiched between the mounting surface 25 and the pressing portion 32, and is mounted between the supported members or the supporting members.

In the case of this mounting structure, in addition to the peripheral wall portion 18 being made thicker to increase its rigidity, that is, the deformation resistance, the bottom rear surface 24 to the height H of the peripheral wall portion 18 is increased. The part is firmly held and restrained by the holder 28. Therefore, even if the peripheral wall portion 18 and the main body portion 29 of the holder 28 are not intentionally fixed by an adhesive, the peripheral wall portion 18 is deformed when the agitating portion 16 is displaced, for example, in the horizontal direction in the figure at the time of inputting vibration / shock. Is suppressed. Therefore, the highly viscous fluid 12 inside can be sufficiently stirred and flowed, and a large damping force can be obtained based on the flow of the highly viscous fluid 12. By the way, the vibration isolation characteristics when the mounting structure of this example is adopted are shown in Table 1 in comparison with the vibration isolation characteristics when the mounting structure shown in FIG. 3 (B) is adopted.

As shown in this table, it can be seen that the resonance magnification is reduced and the damping characteristics are improved in the mounting structure of this example.

The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention is not limited to the holder 34 shown in FIG. 2, or various other shapes depending on the shape of the other side. Various modifications are possible based on the knowledge of those skilled in the art within a range not departing from the gist of the invention, such as a shape, a damper having a shape / form different from the above example, and the like. It is possible to configure in a form in which is added.

[Brief description of drawings]

FIG. 1 is a view showing the constitution of a viscous fluid-sealed damper and its mounting structure according to an embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram for explaining the background of FIG. 10: Damper filled with viscous fluid 12: Highly viscous fluid, 18: Peripheral wall part 20: Flexible part, 24: Back surface 25: Mounting surface, 26: Pressed surface 28: Holder, 32: Pressed part 33: Pressed surface

Claims (2)

[Claims] 1. A hollow shaft-shaped portion connected to a supporting member or a supported member, the stirring portion protruding into a viscous fluid sealed in a container, and a peripheral wall portion surrounding the stirring portion. A viscous fluid-sealed damper having a thin flexible portion elastically supporting the stirring portion in a floating state, and an end surface opposite to the flexible portion is seated on a supported member or a mounting surface of the supporting member. With a viscous fluid-sealed damper that is pressed and fixed on the mounting surface by a mounting member in a state, the outer periphery of the peripheral wall portion is located farther from the mounting surface than the tip position of the stirring section that projects into the viscous fluid. While the pressed surface is formed on the surface, the pressing surface is formed on the mounting member at a corresponding position, and the pressed surface presses and fixes the pressed surface on the mounting surface side. Mounting structure for the viscous fluid-filled damper Structure. 2. A hollow shaft-shaped portion connected to a supporting member or a supported member, the stirring portion projecting into a viscous fluid sealed in a container, and a peripheral wall portion surrounding the stirring portion. A thin flexible portion that elastically supports the stirring portion in a floating state, and by the mounting member in a state where the end surface opposite to the flexible portion is seated on the mounting surface of the supporting member or the supported member. A viscous-body-enclosed damper that is pressed and fixed onto the mounting surface, the outer peripheral side of the peripheral wall portion at a position farther from the mounting surface than the tip position of the stirring section that projects into the viscous fluid,
A viscous fluid-sealed damper characterized in that a pressed surface pressed by the mounting member against the mounting surface is formed.