JP4252466B2 - Vibration isolator with stopper - Google Patents

Description

  The present invention relates to a vibration isolator having a stopper for restricting relative displacement between an inner cylinder and an outer cylinder in the axial direction of the inner cylinder.

  Conventionally, for example, an engine and a transmission are coupled in series, and an inner cylinder connected to a power plant disposed sideways on the vehicle body, and coaxially disposed outside the inner cylinder and connected to the vehicle body. An anti-vibration device that includes an outer cylinder and a rubber body that integrally connects the inner cylinder and the outer cylinder and absorbs vibrations of the power plant in the radial direction of the inner cylinder (a direction perpendicular to the axial direction of the inner cylinder) Are known.

  In order to absorb vibration of the power plant, the rubber body is provided with a straight hole to suppress the dynamic spring constant in the radial direction of the inner cylinder. Therefore, when a large acceleration occurs in the axial direction of the inner cylinder that supports the power plant due to the reaction force at the time of sudden acceleration / deceleration of the vehicle, the rubber body easily deforms into a conical shape and the outer cylinder supports the inner cylinder, etc. There is a problem that a high dynamic spring is caused by the contact.

  Therefore, for example, in Patent Document 1, a barrel portion that extends in the axial direction of the inner cylinder in the corner hole provided in the rubber body, and a protrusion that continuously projects from the barrel portion to both outer sides of the outer cylinder. The elastic body stopper which consists of a part is provided.

  By providing such an elastic body stopper, the relative displacement between the inner cylinder and the outer cylinder in the axial direction of the inner cylinder is restricted, and the impact force that the outer cylinder collides with a bracket or the like that supports the inner cylinder can be reduced. Can do. However, while the elastic body stopper is in contact with the bracket, the elastic body stopper restricts the displacement of the inner cylinder in the radial direction, and the dynamic spring constant of the entire vibration isolator in that direction increases. For this reason, the effect which absorbs the vibration of a power plant is reduced by half, and a vehicle interior sound worsens.

  Therefore, for example, in Patent Document 2, a pressing portion having a pressing surface extending perpendicularly to the axis of the inner cylinder is provided on the outer side from the outer cylinder, and the pressing section is substantially aligned with the axis of the inner cylinder along the outer cylinder. A columnar elastic body stopper is fixed so as to extend in parallel and protrude from the end of the outer cylinder.

  Thus, while the protruding portion of the elastic stopper contacts the bracket supporting the inner cylinder and restricts the axial displacement of the rubber body, the elastic stopper is deformed in the radial direction of the inner cylinder to The dynamic spring constant in the radial direction is prevented from increasing.

Conventionally, a torque rod type vibration isolator is used, and the power plant and the vehicle body are connected by a torque rod extending in the front-rear direction of the vehicle body, and swinging of the power plant during sudden acceleration / deceleration is restricted. It has also been done.
Utility Model Registration No. 3001674 Japanese Patent Application Laid-Open No. 8-200406

  However, in the vibration isolator with a stopper of the above-mentioned Patent Document 2, when the vehicle is repeatedly accelerated and decelerated, the stopper constituted by the elastic body is sandwiched between the pressing portion and the bracket and is compressed, so that it easily wears. It lacks durability.

  In addition, the torque rod type vibration isolator is expensive and requires a large installation space.

  The present invention has been made in view of such points, and the object of the present invention is to devise the configuration of the stopper so that even when a large acceleration is generated in the axial direction of the inner cylinder, the vibration of the power plant. An object of the present invention is to provide a vibration-proof device with a stopper that can maintain the effect of absorbing water and is easy to layout at low cost.

  In order to achieve the above object, in the present invention, the stopper is constituted by a rigid body whose base end is supported by a rubber body.

  Specifically, in the first aspect of the present invention, an inner cylinder connected to one of the vehicle main body or the power plant via a mounting bracket, and coaxially disposed outside the inner cylinder, the vehicle main body or the power plant An outer cylinder connected to the other, a first rubber body that integrally couples the inner cylinder and the outer cylinder to absorb vibrations of the power plant in the radial direction of the inner cylinder, and an axis of the inner cylinder It consists of a rigid body that extends substantially in parallel, and has a protrusion that protrudes outward in the axial direction from one end face of the outer cylinder. When the load is applied in the axial direction of the inner cylinder, the protrusion contacts the mounting bracket. A stopper main body, and a second rubber body that sandwiches the base end portion of the stopper main body and connects to the outer cylinder so that the protruding portion of the stopper main body can swing in the radial direction of the inner cylinder. .

  According to said structure, when the load is applied to the axial direction of an inner cylinder, the protrusion part of a stopper main body contacts the attachment bracket which connects one of an inner cylinder and a vehicle main body, or a power plant, and with respect to the outer cylinder of an inner cylinder. Displacement is regulated. Since the impact force at the time of contact is absorbed by the second rubber body supporting the stopper main body, unpleasant impact sound is not generated and the durability of the first rubber body is improved. Further, while the protruding portion of the stopper main body is in contact with the mounting bracket that supports the inner cylinder, the stopper main body swings in the radial direction of the inner cylinder around the base end portion. At this time, since the stopper main body is composed of a rigid body, the durability is much higher than that of the stopper made of an elastic body, and the second rubber body that clamps the base end portion of the stopper main body by the lever principle is screwed. Therefore, an increase in the dynamic spring constant in the radial direction of the inner cylinder is remarkably suppressed. Therefore, the effect of absorbing the vibration of the power plant in the radial direction of the inner cylinder while the protrusion is in contact with the mounting bracket can be maintained without using the torque rod method, thus saving space and reducing costs. And layout is easy.

  In the second invention, the stopper main body and the second rubber body are disposed in a stopper mounting portion provided on the outer periphery of the outer cylinder, and the stopper main body is coupled to the outer cylinder via the stopper mounting section. Yes.

  According to the above configuration, in accordance with the mounting condition of the vibration isolator with stopper, when a load is applied in the axial direction of the inner cylinder, the protruding part of the stopper body contacts the mounting bracket and swings in the radial direction of the inner cylinder. Thus, the position of the stopper mounting portion can be easily changed.

  In a third aspect of the invention, the stopper main body is disposed between the inner cylinder and the outer cylinder, and the first rubber body and the second rubber body are provided with a predetermined space therebetween.

  According to said structure, since the stopper main body is provided in the outer cylinder, it is not necessary to provide the member which supports a stopper main body separately, and a structure is simple. Further, when the first rubber body and the second rubber body are molded from the same material, the molding is easy.

  According to a fourth aspect of the present invention, the contact surface of the protruding portion of the stopper body with the mounting bracket is covered with the same rubber body as the second rubber body.

  According to the above configuration, the impact can be reduced without providing a member for reducing the impact force caused by the collision with the protrusion of the stopper body on the mounting bracket side. Will improve. Moreover, since the protrusion is covered with the same rubber body as the second rubber body, the molding is easy and the manufacturing cost is reduced.

  As described above, according to the first invention, a load is applied in the axial direction of the inner cylinder, and the protruding portion of the stopper body made of a rigid body protruding outward in the axial direction from the end surface of the outer cylinder When coming into contact with the mounting bracket to be supported, the protruding portion is swung in the radial direction of the inner cylinder around the base end portion sandwiched by the second rubber body. For this reason, even when a large acceleration occurs in the axial direction of the inner cylinder, it is possible to maintain the effect of suppressing the increase in the dynamic spring constant in the radial direction of the inner cylinder and absorb the vibration of the power plant. An easy-to-operate vibration isolator with a stopper can be obtained at low cost.

  In the second aspect, the stopper main body and the second rubber body are disposed in a stopper mounting portion provided on the outer periphery of the outer cylinder, and the stopper main body is connected to the outer cylinder via the stopper mounting section. In the third aspect of the invention, the stopper main body is held between the inner cylinder and the outer cylinder by the second rubber body provided at a distance from the first rubber body. According to these inventions, a vibration isolator with a stopper having an optimum structure can be obtained.

  According to the fourth aspect of the present invention, the contact surface of the protruding portion of the stopper body with the mounting bracket is covered with the same rubber body as the second rubber body, so that the installation freedom is high and the manufacturing cost is low. Is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

(Embodiment 1)
1 and 2 show a vibration isolator with stopper 1 according to Embodiment 1 of the present invention. This vibration isolator with stopper 1 is, for example, an automobile engine (not shown) and a transmission 3 coupled in series. When the power plant 5 is placed horizontally so that its longitudinal direction is the left-right direction of the vehicle body, the transmission 3 side is elastically supported by the vehicle body side frame 7.

  The vibration isolator with stopper 1 has a cylindrical inner cylinder 11 connected to the transmission 3 via a mounting bracket 9. The mounting bracket 9 is made of a rigid body such as aluminum, iron, or resin, extends substantially perpendicular to the axis of the inner cylinder 11, and supports two inner cylinder support portions that support both ends of the inner cylinder 11 with bolts 10 or the like. 9a and an inner cylinder fixing portion 9b that fixes the support portion 9a to the transmission 3 with a bolt (not shown), and the vibration isolator 1 with a stopper is arranged so that the axial direction of the inner cylinder 11 and the longitudinal direction of the vehicle substantially coincide with each other. It is supported by the transmission 3.

  Further, the vibration isolator 1 with a stopper has a substantially cylindrical outer cylinder 13 which is coaxially disposed outside the inner cylinder 11 and connected to the vehicle body side frame 7. A rigid support 15 made of aluminum, iron, resin, or the like is integrally formed on the outer periphery of the outer cylinder 13, and the vibration isolator 1 with a stopper is attached to the vehicle body side frame 7 by a bolt (not shown) via the support 15. It is connected. For example, the inner cylinder 11 is made of aluminum, iron, or the like, and the outer cylinder 13 is made of a fiber-reinforced resin molded product, aluminum, iron, or the like.

  As shown in FIG. 3, the inner cylinder 11 and the outer cylinder 13 are integrally connected by a substantially cylindrical first rubber body 17 provided in the outer cylinder 13 so as to wrap the outer periphery of the inner cylinder 11. Yes. In this way, the power plant 5 that vibrates mainly in the vertical direction during idling has the vehicle body side frame via the first rubber body 17 so that the vertical direction substantially coincides with the radial direction of the inner cylinder 11. 7 is fixedly attached. It is also possible to connect the outer cylinder 13 to the power plant 5 side and connect the inner cylinder 11 to the vehicle body side frame 7 side.

  The first rubber body 17 is formed with a plurality of straight holes 19 penetrating in the axial direction of the inner cylinder 11. By providing the tick hole 19, the dynamic spring constant in the radial direction of the inner cylinder 11 can be made small and non-linear. For this reason, the vibration of the power plant 5 in the vertical direction is absorbed by the radial compression and tensile deformation of the first rubber body 17 and is not easily transmitted to the vehicle body side frame 7, thereby improving the riding comfort.

  As shown in FIG. 1, as a feature of the present invention, a stopper mounting portion 21 having a U-shaped cross section that opens in the axial direction of the inner cylinder 11 is disposed on the outer periphery of the outer cylinder 13 by bonding or the like. The stopper mounting portion 21 is provided with a stopper body 23 made of an elongated rectangular plate-like metal extending substantially parallel to the axis of the inner cylinder 11. The stopper mounting portion 21 may be formed integrally with the outer cylinder 13, and the stopper main body 23 may be made of resin.

  As shown in FIG. 3, the stopper main body 23 is arranged so that the longitudinal direction of the cross section thereof substantially coincides with the vertical direction that is the vibration direction of the power plant 5. As shown in FIG. 1, the stopper main body 23 has a protruding portion 23a protruding outward in the axial direction from one (front) end surface of the outer cylinder 13, and a base end opposite to the protruding portion 23a. The portion 23 b is sandwiched by a second rubber body 25 that connects the inner surface of the stopper mounting portion 21 and the stopper main body 23. Thus, the protruding portion 23a side of the stopper main body 23 can swing in the radial direction (vertical direction) of the inner cylinder 11 with the base end portion 23b as a fulcrum. Furthermore, the stopper main body 23 can be displaced also in the axial direction of the inner cylinder 11 by deforming the second rubber body 25.

  Further, at least a portion of the stopper main body 23 that comes into contact with the inner cylinder support portion 9 a of the mounting bracket 9 on the protruding portion 23 a side is rubber-molded with a cover portion 27 made of the same rubber as the second rubber body 25. It is desirable that the cover portion 27 be bonded at the same time when the stopper body 23 is bonded to the stopper mounting portion 21 by the second rubber body 25.

  Since the dynamic spring constant in the radial direction of the inner cylinder 11 in the first rubber body 17 is kept small, for example, a reaction force centered on the roll axis is generated in the power plant 5 during sudden acceleration of the vehicle. When a large acceleration in the front-rear direction is applied to the inner cylinder 11 that supports the power plant 5, the first rubber body 17 is easily deformed into a conical shape. Thus, when the load is applied in the axial direction of the inner cylinder 11, the protrusion 23 a is arranged so that the protrusion 23 a contacts the inner cylinder support 9 a of the mounting bracket 9.

-Driving action-
During normal vehicle operation, if vibration of the power plant 5 occurs in the vertical direction, the vibration is transmitted to the inner cylinder 11 of the vibration isolator 1 with stopper, and the radial direction of the inner cylinder 11 of the first rubber body 17 It is absorbed by compression and tensile deformation.

  On the other hand, when a large acceleration in the front-rear direction occurs in the inner cylinder 11 that supports the power plant 5 as a reaction force at the time of sudden acceleration of the vehicle, the first rubber body 17 is deformed into a conical shape, and the protruding portion 23a is attached to the mounting portion It contacts the inner cylinder support portion 9a of the bracket 9. At this time, the stopper main body 23 displaces the second rubber body 25 sandwiching the base end portion 23b in the axial direction of the inner cylinder 11 to apply a tensile stress, and the second rubber body 25 resists the tensile stress. As a result, the projecting portion 23 a absorbs the impact force that contacts the inner cylinder support portion 9 a of the mounting bracket 9. Furthermore, since the protrusion 23a is rubber molded, no collision noise is generated at the time of contact, and the inner cylinder support 9a of the mounting bracket 9 is not damaged.

  Even in this state, the vertical vibration of the power plant 5 is transmitted to the inner cylinder 11, but the protrusion 23 a of the stopper main body 23 is in the radial direction of the inner cylinder 11 with the base end 23 b side of the stopper main body 23 as a fulcrum. The second rubber body 25 is deformed by swinging in the (up and down direction of the power plant 5). At this time, the base end 23 b side is twisted by the vertical swing of the protruding portion 23 a of the stopper main body 23, and a torsional stress is generated in the second rubber body 25. With respect to the torsional stress, the second rubber body 25 is more easily deformed than the tensile stress when the protruding portion 23a contacts the inner cylinder support portion 9a of the mounting bracket 9 as a characteristic of rubber, and Due to the so-called lever principle with the base end portion 23b side of the stopper body 23 as a fulcrum, the protruding portion 23a is easy to swing. For this reason, as shown in FIG. 4, the increase in the dynamic spring constant in the radial direction of the inner cylinder 11 in the entire vibration isolator with stopper 1 is larger than that in the vibration isolator provided with an elastic stopper as in Patent Document 1. Minimized. In FIG. 4, the horizontal axis indicates the frequency of vibration transmitted from the power plant 5, and the vertical axis indicates the dynamic spring constant of the entire vibration isolator 1 with a stopper in the radial direction of the inner cylinder 11.

  That is, during normal operation, the dynamic spring constant in that direction is suppressed to be small so that vibration in the radial direction of the inner cylinder 11 can be easily absorbed (indicated by a broken line in FIG. 4). When a load is generated in the front-rear direction (in the axial direction of the inner cylinder) during sudden acceleration of the vehicle and the protruding portion 23a comes into contact with the inner cylinder support portion 9a of the mounting bracket 9, the conventional vibration isolator has the inner cylinder 11 The displacement in the radial direction is restricted, and the dynamic spring constant is increased (indicated by a dashed line in FIG. 4). For this reason, the effect which absorbs the vibration of the power plant 5 will be halved, and riding comfort will deteriorate remarkably.

  On the other hand, in the vibration isolator 1 with a stopper according to the present embodiment, even if a load is generated in the front-rear direction during sudden acceleration of the vehicle and the protruding portion 23a contacts the inner cylinder support portion 9a of the mounting bracket 9, the stopper body Since the protrusion 23a of the rocker 23 swings in the vertical direction of the vehicle body (in the radial direction of the inner cylinder 11), an increase in the dynamic spring constant of the entire vibration isolator 1 with a stopper in that direction is remarkably suppressed (solid line in FIG. 4). ).

  Therefore, the vibration in the vertical direction of the power plant 5 is absorbed by the first rubber body 17 and the second rubber body 25 and is not easily transmitted to the vehicle body side frame 7.

-Effect of Embodiment 1-
Thus, according to the vibration isolator with stopper 1 of the present embodiment, when a load is applied in the axial direction of the inner cylinder 11 and the protruding portion 23a of the stopper main body 23 comes into contact with the mounting bracket 9 that supports the inner cylinder 11. The projecting portion 23a swings in the radial direction of the inner cylinder 11 around the base end portion 23b sandwiched by the second rubber body 25. For this reason, even when a large acceleration occurs in the axial direction of the inner cylinder 11, it is possible to maintain the effect of suppressing the increase in the dynamic spring constant in the radial direction of the inner cylinder 11 and absorbing the vibration of the power plant 5. Compared with the case where the torque rod method is adopted, the cost can be reduced and the layout is easy.

  Further, the stopper main body 23 and the second rubber body 25 are disposed in the stopper mounting portion 21 provided on the outer periphery of the outer cylinder 13, and the stopper main body 23 is connected to the outer cylinder 13 via the stopper mounting portion 21. Thus, the position of the stopper mounting portion 21 can be easily changed, and the degree of freedom in designing the vibration isolator 1 with a stopper is improved.

  Furthermore, since the protrusion 23a of the stopper main body 23 is covered with the same rubber body as the second rubber body 25, the degree of freedom in installation is increased and the manufacturing cost is also reduced.

-Modification of Embodiment 1-
The shape of the mounting bracket 9 and the support 15 may be changed depending on the installation position of the vibration isolator 1 with the stopper according to the above embodiment. For example, when the shape of the support 15 is as shown in FIGS. A stopper mounting portion 21 can be provided on the front. In short, when the vibration isolator with stopper 1 is arranged so that the axial direction of the inner cylinder 11 is in the longitudinal direction of the vehicle body orthogonal to the longitudinal direction of the power plant 5, the stopper body 23 extends in the longitudinal direction of the vehicle body, What is necessary is just to arrange | position the stopper attaching part 21 so that the longitudinal direction of the cross section may correspond with the up-down direction which is the vibration direction of the power plant 5. FIG.

(Embodiment 2)
FIG. 7 shows Embodiment 2 of the present invention, which differs from Embodiment 1 in that the installation position of the stopper body 23 is different. In the present embodiment, the same portions as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the stopper mounting portion 21 is not provided, and the two stopper main bodies 23 are disposed between the inner cylinder 11 and the outer cylinder 13. Specifically, the inner cylinder 11 has a trapezoidal cross section and has a through-hole 11 a penetrating in the axial direction, and the first rubber body 17 is connected between the outer surface and the inner surface of the outer cylinder 13. The second rubber body 25 is provided with a predetermined space from the first rubber body 17 by a straight hole 19 provided in the outer cylinder 13. Each stopper main body 23 is disposed so that the longitudinal direction of the cross section thereof substantially coincides with the vertical direction that is the vibration direction of the power plant 5, and the base end portion 23 b is sandwiched by the second rubber body 25 to protrude. The portion 23a can swing in the radial direction of the inner cylinder 11 (up and down direction of the power plant 5).

  Thus, since the stopper main body 23 is provided in the outer cylinder 13, it is not necessary to separately provide a member for supporting the stopper main body 23, the structure is simple, and the first rubber body 17 and the second rubber body. In the case of molding 25 with the same material, the molding is easy.

  Also in this embodiment, the same effects as those of the first embodiment can be obtained.

(Other embodiments)
The present invention may be configured as follows for each of the above embodiments.

  That is, in the first embodiment, two stopper mounting portions 21 are provided, and the protruding portions 23a of the stopper main body 23 provided in each stopper mounting portion 21 are protruded from different end portions of the outer cylinder 13, respectively. In any of the acceleration and deceleration, one of the projecting portions 23 a can collide with the inner cylinder support portion 9 a of the mounting bracket 9.

  Further, instead of rubber molding the protruding portion 23a of the stopper main body 23, rubber may be provided at a portion where the protruding portion 23a on the inner cylinder support portion 9a side of the mounting bracket 9 contacts.

  As described above, the present invention is useful for a vibration isolator having a stopper that absorbs the radial vibration of the inner cylinder and restricts the relative displacement between the inner cylinder and the outer cylinder in the axial direction of the inner cylinder. is there.

It is a perspective view which shows the vibration isolator with a stopper concerning Embodiment 1. FIG. It is an II direction arrow directional view of the vibration isolator with a stopper of FIG. It is the III-III sectional view taken on the line of FIG. It is explanatory drawing which shows typically the change of the dynamic spring constant of the radial direction of the inner cylinder in a vibration isolator with a stopper. FIG. 6 is a view corresponding to FIG. 3 illustrating a vibration isolator with a stopper according to a modification of the first embodiment. FIG. 5 is a view corresponding to FIG. 3 showing a vibration isolator with stopper according to another modification of the first embodiment. FIG. 4 is a view corresponding to FIG. 3 illustrating a vibration isolator with a stopper according to a second embodiment.

Explanation of symbols

1 Anti-vibration device with stopper 5 Power plant 7 Car body side frame (vehicle body)
DESCRIPTION OF SYMBOLS 9 Mounting bracket 11 Inner cylinder 13 Outer cylinder 17 1st rubber body 21 Stopper mounting part 23 Stopper main body 23a Protrusion part 23b Base end part 25 2nd rubber body

Claims (4)

An inner cylinder connected to one of the vehicle body or the power plant via a mounting bracket;
An outer cylinder that is coaxially disposed outside the inner cylinder and connected to the other of the vehicle body or the power plant;
A first rubber body that integrally connects the inner cylinder and the outer cylinder to absorb the vibration of the power plant in the radial direction of the inner cylinder;
The protruding portion is formed of a rigid body that extends substantially parallel to the axis of the inner cylinder, has a protruding portion that protrudes outward in the axial direction from one end surface of the outer cylinder, and is loaded when a load is applied in the axial direction of the inner cylinder. A stopper body that contacts the mounting bracket;
And a second rubber body that sandwiches the base end portion of the stopper main body and is connected to the outer cylinder so that the protruding portion of the stopper main body can swing in the radial direction of the inner cylinder. Anti-vibration device with stopper. The vibration isolator with a stopper according to claim 1,
The stopper main body and the second rubber body are disposed in a stopper mounting portion provided on the outer periphery of the outer cylinder,
The stopper main body is connected to the outer cylinder through a stopper mounting portion, and is provided with a vibration isolator with a stopper. The vibration isolator with a stopper according to claim 1,
The stopper body is disposed between the inner cylinder and the outer cylinder,
The vibration isolator with a stopper, wherein the first rubber body and the second rubber body are provided with a predetermined space therebetween. In the vibration isolator with a stopper in any one of Claims 1-3,
A vibration isolator with a stopper, wherein a contact surface of the protruding portion of the stopper main body with the mounting bracket is covered with the same rubber body as the second rubber body.

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