JP2009222164A - Bound stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bound stopper capable of suppressing to the minimum the displacement of a vertically movable member on a wheel side owing to an increase in the displacement and an almost linear increase of a spring force accompanied by an increase in the displacement and favorably controlling an abrupt rise of spring characteristics in the vicinity of limit displacement while developing spring characteristics of a proper size to a certain extent from the start time of stopper action. <P>SOLUTION: A bound stopper 10 formed of a cup-like rigid mounting member 12 and a rubber elastic body 14 has a radial outside gap 40 between the peripheral wall 18 of the mounting member 12 and the outer peripheral surface of the rubber elastic body 14, and a non-through inside gap 42 axially extending toward an abutment part 32 from a bottom 38 in the center of the rubber elastic body 14. The rubber elastic body 14 is elastically deformed so as to gradually fill the outside gap 40 and inside gap 42 during the stopper action. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bound stopper as a buffer member for restricting excessive displacement of a member that moves up and down together with wheels such as a suspension arm and a leaf spring of an automobile to the vehicle body side.

Conventionally, in a vehicle, a part of a suspension device such as a suspension arm or a leaf spring, that is, a vertically moving member on a wheel side that moves up and down together with the wheel is excessively displaced toward the vehicle body side due to large vertical movement of the wheel due to unevenness of the road surface during traveling In order to prevent a shock from being directly transmitted to the vehicle body when hitting the vehicle body, a bound stopper as a buffer member is attached to the suspension device side or the vehicle body side.
This bound stopper has a rubber elastic body as a main element. When the above-mentioned vertical movement member on the wheel side is greatly displaced toward the vehicle body side, the rubber elastic body is elastically deformed to reduce the impact, and The excessive displacement of the moving member toward the vehicle body is restricted.

Normally, this bound stopper exhibits a low reaction force characteristic, that is, a low spring characteristic at the time of initial deformation at the time of stopper action, and the reaction force increases as the deformation progresses sequentially, and the reaction force rapidly increases in the vicinity of the limit displacement of the vertical movement member. The characteristic of the rubber elastic body is set so that the spring characteristic curve rises rapidly.
As a shape of the rubber elastic body for realizing this, a shape as shown in FIG.

In FIG. 7 (a), 202 is a rubber elastic body in the bound stopper 200, 204 is a metal rigid mounting member, and 206 is for fastening the bound stopper 200 to one of the wheel side vertical movement member and the vehicle body side. The fastening bolt.
As shown in the drawing, the rubber elastic body 202 has a shell shape, that is, a cross-sectional mountain shape, in order to soften the initial contact at the time of the stopper action and to rapidly increase the displacement regulating force from the latter stage to the limit displacement. .

  By the way, in a truck such as a pickup truck, in recent years, as a leaf spring used for a leaf spring in order to improve riding comfort performance, a soft spring has been used. In this case, the leaf spring is softened. The displacement of the leaf spring when getting over the unevenness of the road surface increases, and the number of times that the bound stopper acts as a stopper also increases.

  If the leaf springs are constantly displaced greatly, the durability of the leaf springs will be deteriorated. Therefore, in order to prevent this, when the leaf springs are displaced to some extent, it is necessary to act as a stopper with a bound stopper to regulate the displacement. . As a result, the number of stops of the bound stopper increases.

  At this time, in the case of the bound stopper 200 shown in FIG. 7 (a), the upper portion 202A of the rubber elastic body 202 in the figure at the initial stage per stopper can be relatively easily deformed to elastically absorb the displacement of the leaf spring. Although the rubber elastic body 202 having a block shape has a solid structure, the deformation resistance (rubber reaction force) of the rubber elastic body 202 is absorbed after the shock at the initial hitting is absorbed by the deformation of the upper portion 202A. As a result, in the case of the bound stopper 200 shown in FIG. 5A, the deformation resistance of the rubber elastic body 202 is rapidly increased as shown by the spring characteristic curve A (load-deflection characteristic curve) in FIG. Due to the increase, the spring characteristic curve suddenly rises at an early stage.

That is, after the upper portion 202A of the rubber elastic body 202 hits the counterpart member 208, the spring characteristic of the rubber elastic body 202 suddenly rises with a relatively slight displacement, and the reaction force is transmitted to the vehicle body side.
At that time, the passenger is shocked.

In the case of the bound stopper 200 having the solid rubber elastic body 202 as shown in FIG. 7 (a), the spring characteristics after the initial hitting can be lowered only by changing the rubber shape of the rubber elastic body 202. Has its limits.
Therefore, it is conceivable to form a recess in the rubber elastic body 202 in FIG. 7 (a) from the top to the bottom in the figure and remove a part of the rubber elastic body. Further, dust, pebbles, etc. accumulate, and rubber wear is promoted or cracks are generated by repetition of the stopper action, so that the life of the rubber elastic body 202 is reduced.
Even if such a recess is provided, the spring characteristic per initial stage can be lowered, but the recess is buried at a relatively early stage of the stopper action, and then the spring characteristic suddenly rises. A shock feeling similar to the above is generated.

Conventionally, a bounding stopper as shown in FIG. For example, Patent Document 1 below discloses a bound stopper of this form.
7 (b) shows that a bound stopper 200 is constituted by a cup-shaped metal rigid mounting member 210 and a rubber elastic body 202, and from the mounting member 210 of the rubber elastic body 202 in the figure. A plurality of grooves 212 perpendicular to the axis are provided from the outer surface of the portion protruding upward, and the portion is formed as a gap (a straight portion).

In FIG. 5, B shows the spring characteristic curve of the bound stopper 200 of FIG.
In the case of the bound stopper 200 shown in FIG. 7B, the rubber elastic body 202 can be deformed so as to fill the groove (gap) 212 after the rubber elastic body 202 hits the mating member 208. As shown by the spring characteristic curve B in FIG. 7, the spring characteristic can be softened and lowered over a wider stroke (displacement region) than the bound stopper 200 shown in FIG.

However, in this case, for example, the amount of displacement at the time of the stopper action of the leaf spring is increased, and specifically, the leaf spring is frequently displaced frequently, and the durability of the leaf spring is reduced.
In addition, in the case of the bound stopper 200 of FIG. 7B, after the groove (gap) 212 is filled, the deformation resistance of the rubber elastic body 202 increases abruptly as shown by the spring characteristic curve B. At that time, the spring characteristics suddenly rise. Therefore, a shock is given to the passenger at that stage.

FIG. 7 (c) shows another conventionally known bound stopper (disclosed in Patent Document 2 below).
In this structure, a through-hole (straight portion) 214 is provided in the upper portion 202A of the rubber elastic body 202.
However, the bound stopper 200 shown in FIG. 7 (C) also exhibits a soft spring characteristic until the gap 214 is filled. On the other hand, after the gap 214 is filled, the spring characteristic rapidly rises. The spring characteristics are basically the same as those of the bound stopper 200 shown in (b), and therefore have the same problems as those shown in (b).

  As described above, the conventional bound stopper has a spring characteristic that suddenly rises from a relatively early stage of the stopper action and generates a shock feeling there, or the spring characteristic during the stopper action is too soft. In addition, the displacement of the vertically moving member such as the leaf spring in the suspension device is increased, thereby reducing the durability, and then the spring characteristics suddenly rises at a certain stage and gives a sense of shock there. Either of which is not sufficient.

In order not to give a shock feeling due to the reaction force of the abrupt stopper action while suppressing the displacement of the vertically moving members such as leaf springs to a small level, not only the initial hit at the time of the stopper action but also just before the limit displacement. It is desirable that the spring characteristic continuously increases linearly with deformation until it is deformed, and that the sudden rise of the spring characteristic toward the limit displacement can be suppressed as much as possible.
However, in the case of the conventionally known bound stopper 200 shown in FIGS. 7 (B) and 7 (C), the spring characteristic from the initial stage per stopper until just before the limit displacement is lower than the appropriate spring characteristic, while the limit displacement is The spring characteristics suddenly rise in the vicinity.

  This is because both the (B) and (C) bound stoppers 200 are deformed in a part of the rubber elastic body 202, more specifically, mainly in the upper part than the other lower parts 202B until reaching the limit displacement. Thus, the displacement of the vertically moving member is absorbed and the displacement is not absorbed based on the overall deformation of the rubber elastic body 202.

As prior art to the present invention, there are those disclosed in Patent Literature 3, Patent Literature 4, and Patent Literature 5.
Although what is disclosed in Patent Document 3 relates to “bound stopper and manufacturing method thereof”, the bound stopper disclosed in Patent Document 3 does not have the characteristic inner gap of the present invention, and Are different.

Further, the one disclosed in Patent Document 4 relates to a buffer stopper, which does not have an outer space between the peripheral wall portion of the mounting member and the rubber elastic body, and the function of the inner space is completely different from the present invention. It is different and is also different from the present invention.
Further, the one disclosed in Patent Document 5 relates to a “bump stopper”, which also does not have an outer space between the peripheral wall portion of the rigid mounting member and the rubber elastic body, which is different from the present invention. belongs to.

JP 2004-3591 A JP 2001-159441 A JP-A-11-51116 JP 2001-153168 A JP 2000-177348 A

  The present invention is based on the circumstances as described above, and the spring increases almost linearly as the displacement increases, while exhibiting a certain amount of appropriate spring characteristics from the start of the stopper action. The displacement of vertical movement members such as leaf springs can be suppressed to a small level, and the sudden rise of the spring characteristics in the vicinity of the limit displacement can be well suppressed, preventing the passenger from feeling shocked. It is made for the purpose of providing the bounce stopper to obtain.

  Thus, according to the first aspect of the present invention, (a) a cup having a bottom portion and an annular peripheral wall portion rising from the outer peripheral end portion of the bottom portion is formed. And (b) a bottom surface on the opposite side of the corresponding portion in a state in which the contact portion at the time of stopper action projects from the peripheral wall portion of the mounting member in the axial direction of the mounting member. And a block-shaped rubber elastic body provided radially inward of the mounting member in a state in which the mounting member is fixed to the bottom of the mounting member, and restricts excessive displacement of the vertical movement member toward the vehicle body side. A bounce stopper serving as a buffer member, wherein a radially outer space is provided between the peripheral wall portion of the mounting member and the outer peripheral surface of the rubber elastic body, and from the bottom surface at the central portion of the rubber elastic body. It extends in the axial direction toward the contact portion A non-penetrating inner space is provided, and the rubber elastic body is elastically deformed so as to gradually fill the outer space and the inner space when the stopper is operated.

  According to a second aspect of the present invention, in the rubber elastic body according to the first aspect, the outer peripheral surface of the base end portion on the bottom portion side of the mounting member has an inner peripheral surface of the peripheral wall portion extending over a predetermined height in the axial direction. The inner gap is extended to a higher position on the contact portion side than the contact portion with the peripheral wall portion.

  According to a third aspect of the present invention, in any one of the first and second aspects, an outer space between the peripheral wall portion and the outer peripheral surface of the rubber elastic body is provided over the entire circumference.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the rubber elastic body has a shape that increases in diameter from the contact portion toward the bottom side of the mounting member, The gap width in the radial direction is gradually narrowed toward the bottom side.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the inner gap has a gradually increasing gap width in the radial direction toward the bottom side of the mounting member.

  According to a sixth aspect of the present invention, in the second aspect of the present invention, the rubber elastic body has a hook-like portion protruding annularly radially outwardly on the outer peripheral portion of the base end portion, and the outer periphery of the hook-like portion The surface is in close contact with the peripheral wall portion.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the inner space is lower than a height of the peripheral wall portion in the axial direction.

  According to an eighth aspect of the present invention, in any one of the first to sixth aspects, the inner space is higher than a height of the peripheral wall portion in the axial direction.

Effects and effects of the invention

  As described above, the present invention provides a rigid cup-shaped mounting member having a bottom portion and an annular peripheral wall portion, and a mounting member in a state in which a contact portion at the time of stopper action projects from the peripheral wall portion in the axial direction of the mounting member. The block-shaped rubber elastic body provided radially inward forms a bound stopper, and a radial outer space is provided between the peripheral wall portion of the mounting member and the outer peripheral surface of the rubber elastic body, and rubber elasticity A non-penetrating inner space extending in the axial direction from the bottom surface toward the contact portion is provided at the center of the body, and the rubber elastic body is elastically deformed so as to gradually fill the outer space and the inner space when the stopper is operated. It is a thing.

  In the bound stopper of the present invention, when the rubber elastic body hits the mating member and acts as a stopper, the rubber elastic body can be deformed while gradually filling the outer gap and the inner gap. Compared to the bound stopper in FIG. 7 (a), the reaction force at the time of the deformation of the rubber elastic body can be made smaller than that in FIG. it can. That is, it is possible to lower the spring characteristics at the initial stage and the subsequent deformation of the rubber elastic body as compared with that of (A).

In addition, since the rubber elastic body is deformed while gradually filling the outer gap and the inner gap, the reaction force due to the deformation of the rubber continuously and almost linearly increases until the outer gap and the inner gap are mostly filled. . That is, the spring characteristic of the rubber elastic body can be increased linearly, and a large displacement region (stroke) in which the spring characteristic increases linearly can be ensured.
That is, the spring characteristic of the rubber elastic body in the normal area (the displacement area normally used in the stopper action) in the bound stopper can be increased linearly.

  However, in the present invention, the outer space is located on the side of the mounting member opposite to the contact portion of the rubber elastic body, and the inner space is directed from the bottom of the mounting member toward the contact portion of the rubber elastic body. Furthermore, since the inner space is located at the core (radial core) of the rubber elastic body, the space is provided on the contact portion side as shown in FIGS. Unlike the bound stopper shown in the above, the gap portion of the rubber elastic body is partially softened by these gaps, and the gap is not buried by partially deforming the bump side, In the bound stopper of the present invention, the outer gap and the inner gap are gradually filled only when the rubber elastic body is deformed as a whole.

For this reason, the spring characteristics in the deformation region of the rubber elastic body until the gap is mostly filled are relatively harder than those shown in FIGS.
As a result, the displacement of the vertically moving members such as the leaf springs of the suspension device in the normal range can be suppressed to be small and the durability life thereof can be increased.

  In the bound stopper of the present invention, the rubber elastic body is compressed and deformed in the axial direction by the mating member at the time of the stopper action, and at that time, the rubber elastic body is deformed so that the outer peripheral portion extends radially outward, and the deformation causes the outer gap to be Gradually filled. And if the outer space | gap is filled much, an inner space | gap will be gradually filled with the reaction force from a surrounding wall part.

That is, in the bound stopper of the present invention, the reduction or disappearance of the outer gap works so as to gradually fill the inner gap.
While causing such a phenomenon, the rubber elastic body gradually raises the spring, and the deformation resistance of the rubber elastic body increases greatly from the point where most of the outer gap and inner gap are filled, whereupon the spring characteristic curve rises. Will be produced.

However, the change at that time is not as rapid as shown in FIGS. 7 (b) and 7 (c), so that the sudden rise of the spring characteristic of the rubber elastic body in the vicinity of the limit displacement is satisfactorily suppressed. This can prevent the passenger from feeling a shock.
In addition, the bound stopper of the present invention has an advantage that the rubber elastic body is not easily buckled during the stopper action even if the free length (deformable height) of the rubber elastic body is increased due to the outer gap and the inner gap.

In addition, the said inside space | gap can be made into the shape opened by the bottom face of the rubber elastic body.
Further, the rubber elastic body can have the outer peripheral surface of the base end portion on the bottom side of the mounting member closely attached to the inner surface of the peripheral wall portion over a predetermined height in the axial direction.
At that time, the inner space can be formed in a shape extending to a position higher than the contact portion side with respect to the peripheral wall portion (claim 2).

By doing in this way, an inner space | gap can be effectively filled with a deformation | transformation of a rubber elastic body.
Moreover, the said outer space | gap between the surrounding wall part of an attachment member and the outer peripheral surface of a rubber elastic body can be provided over the perimeter (Claim 3).

Further, the rubber elastic body has a shape in which the diameter increases from the contact portion toward the bottom side of the mounting member, and the radial width of the outer space can be gradually narrowed toward the bottom side ( Claim 4).
By doing in this way, a spring characteristic can be continuously improved more effectively with a deformation | transformation of a rubber elastic body.

On the other hand, the inner gap can be configured to gradually expand the radial gap width toward the bottom side of the mounting member.
By doing in this way, a spring characteristic can be increased smoothly and continuously with a deformation | transformation of a rubber elastic body.

  Next, a base end portion of the rubber elastic body has a flange-like portion protruding annularly radially outward at the outer peripheral portion, and the outer peripheral surface of the flange-like portion is in close contact with the peripheral wall portion. In this way, the outer gap can be satisfactorily formed in a shape that gradually fills with the overall deformation of the rubber elastic body.

  In the present invention, depending on the stopper characteristics required for the bound stopper, the inner gap is not lower than the height of the peripheral wall portion in the axial direction (Claim 7), or conversely higher than the height of the peripheral wall portion. (Claim 8).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIGS. 1 and 2, reference numeral 10 denotes a bound stopper suitable for use in, for example, displacement control of a suspension device for a pickup truck.
Here, the bound stopper 10 is used by being attached to either the leaf spring of the suspension device or the vehicle body frame when used for restricting the displacement of the suspension device in the pickup truck.

As shown in the figure, the bound stopper 10 has a metal-made rigid attachment member 12 and a rubber elastic body 14 that is integrally vulcanized and bonded to the attachment member 12 and that mainly serves as a stopper. .
The mounting member 12 has a cup shape having a bottom portion 16 having a circular planar shape and an annular peripheral wall portion 18 that rises at a right angle upward from the outer peripheral end of the bottom portion 16 in the drawing.

  The peripheral wall portion 18 is a flange portion 20 whose upper end portion is opened in a curved shape outward in the radial direction, and a circular opening 22 is provided at the center of the bottom portion 16, and between the opening 22 and the peripheral wall portion 12, A pair of fastening bolts 24 are fixed downward in the figure.

  In the bound stopper 10, the mounting member 12 is fastened and fixed to either the leaf spring or the vehicle body frame by the fastening bolt 24. At this time, the rubber elastic body 14 is opposed to the other (the mating member 48 in FIG. 3) in the vertical direction.

The bottom portion 16 is provided with a through-hole fixing hole 26, and the fastening bolt 24 is press-fitted downward in the figure so as to bite the serration portion 28 into the inner surface of the fixing hole 26, and is fixed to the bottom portion 16.
The pair of fastening bolts 24 has a large-diameter head 30 on the upper side of the bottom 16 in the figure, and the head 30 is embedded in the rubber elastic body 14.

The rubber elastic body 14 has a conical shape as a whole, and a substantially upper half portion in the figure is protruded upward from the mounting member 12 in the axial direction.
In the drawing, the upper end portion forms a contact portion 32 against the mating member 48 (see FIG. 3) during the stopper action.
Here, in the contact portion 32, the outer surface serving as the contact surface is a curved surface.
Since the rubber elastic body 14 has a conical shape as a whole, the outer diameter gradually increases from the upper end to the lower end in the drawing, that is, from the contact portion 32 side to the bottom portion 16 side of the mounting member 12. It has become diameter.

The rubber elastic body 14 has a hook-like portion 36 whose base end portion 34 on the bottom 16 side of the attachment member 12 protrudes in an annular shape radially outward, and the outer peripheral surface of the hook-like portion 36 is attached to the rubber elastic body 14. The member 12 is vulcanized and bonded to the peripheral wall portion 18 in close contact with the inner peripheral surface of the peripheral wall portion 18 of the member 12 over the entire circumference.
The bottom surface 38 is also integrally vulcanized and bonded to the top surface of the bottom portion 16 of the mounting member 12 in the figure.

Between the inner peripheral surface of the peripheral wall portion 18 and the outer peripheral surface of the rubber elastic body 14, specifically, the outer peripheral surface of the substantially lower half portion, an annular shape is formed in the circumferential direction along the peripheral wall portion 18 and the rubber elastic body 14. The outer space 40 is formed over the entire circumference.
Here, the outer space 40 is formed from the upper end of the peripheral wall portion 18 to the position of the flange portion 36 in the rubber elastic body 14, and the radial space width of the outer space 40 is downward from the upper end in the drawing, The mounting member 12 is gradually narrowed toward the bottom 16 side.

The rubber elastic body 14 is also provided with an inner space 42 extending upward in the axial direction from the bottom surface 38 toward the contact portion 32 at the upper end portion in the drawing at the center thereof.
The inner space 42 is non-penetrating so as not to penetrate the rubber elastic body 14, and in this embodiment, the upper end thereof is located at a height position substantially half of the peripheral wall portion 18 in the mounting member 12.

The inner space 42 has a conical shape that is substantially similar to the rubber elastic body 14, and the upper end surface in the drawing is a curved surface.
Due to the formation of the inner space 42, the rubber elastic body 14 forms an annular leg 44 whose peripheral portion undergoes shear compression elastic deformation at the time of stopper action.
The inner space 42 has a shape in which the lower end is opened at the bottom surface 38, and the opening 46 is made to coincide with the opening 22 of the bottom portion 16.
Air inside the inner space 42 can enter and leave the outside through these openings 46 and 22.

  As shown in FIGS. 1 and 2, in this embodiment, the rubber elastic body 14 is not provided with a tick portion (gap) such as a groove or a recess opened on the outer surface thereof. The outer surface (outer peripheral surface) as a whole has a continuous and smooth surface without unevenness.

3 and 4 schematically show how the rubber elastic body 14 is deformed in the bound stopper 10.
Further, C in FIG. 5 represents a spring characteristic curve (load-deflection characteristic curve) of the bound stopper 10 of the present embodiment.
FIG. 3 (I) shows a state when the stopper action is not performed. In this state, when a part of the suspension device (for example, the leaf spring) is largely displaced toward the vehicle body, the bound stopper 10 is stopped there. Works.
At this time, the rubber elastic body 14 starts to deform when the contact portion 32 first hits the mating member 48. At the initial stage of the stopper action at this time, that is, at the time of initial contact, the contact portion 32 having a small cross-sectional width in the radial direction can be relatively easily deformed, and the height of the inner gap 42 is set to the rubber. The outer space 40 and the inner space 42 are hardly filled with the space so as to be slightly lowered with the compression of the elastic body 14.

When the rubber elastic body 14 is further pushed downward in the figure by the mating member 48 from this state, the rubber elastic body 14 is further compressed and elastically deformed in the axial direction as shown in FIG. As the outer peripheral portion of the rubber elastic body 14 spreads outward in the radial direction and deforms, a part of the outer gap 40 is filled.
At that time, the outer space 40 is filled with the deformation of the rubber elastic body 14 more in the upper part in the drawing than in the lower part.

  Further, at this time, as shown in FIG. 3 (III), the inner gap 42 becomes lower than the state shown in FIG. 3 (II) due to the compressive deformation of the rubber elastic body 14 in the axial direction ( The upper part of the inner space is partially filled).

FIG. 3 (IV) shows a state in which the rubber elastic body 14 is further compressed in the axial direction from that state.
As shown in the figure, at this time, the portion of the rubber elastic body 14 located inside the peripheral wall portion 18 expands and deforms radially outward, so that the upper portion of the outer space 40 is filled with the rubber elastic body 14, and the peripheral wall portion 18. The upper inner peripheral surface and the outer peripheral surface of the rubber elastic body 14 are in partial contact with each other.

  At the stage shown in FIG. 3 (IV), a part of the rubber elastic body 14 and a part of the peripheral wall portion 18 come into contact with each other, so that the deformation resistance of the rubber elastic body 14 becomes larger than before, and thereafter. The rate of increase of the spring accompanying the deformation of the rubber elastic body 14 is smoothly increased (the point X in the spring characteristic curve C in FIG. 5 is a part of the rubber elastic body 14 partially hitting the peripheral wall 18. Shows the characteristic value when).

  When the rubber elastic body 14 is further greatly crushed downward and deformed by the mating member 48, the remaining space of the outer space 40 partially remaining at the stage of FIG. Since the outer gap 40 is filled, the deformed rubber is directed toward the inner gap 42 only, and finally the inner gap 42 remains partly as shown in FIG. 14 is filled.

As the outer gap 40 gradually fills and the inner gap 42 gradually fills in this way, the deformation resistance and deformation reaction force of the rubber elastic body 14 become the amount of displacement (deflection) on the horizontal axis in FIG. In comparison, the degree of increase is increased, and the spring characteristic curve C shows an upward rising in the figure.
However, the bound stopper 10 of this embodiment does not immediately fill the outer gap 40 and the inner gap 42 when the easily deformable portion of the rubber elastic body 14 is deformed. While being deformed, the outer gap 40 and the inner gap 42 are gradually filled according to the deformation of the rubber elastic body 14 with the overall deformation.

Therefore, in the normal displacement region shown in FIG. 5, the rubber elastic body 14 has a soft spring characteristic compared to that shown in FIG. 7 (a) and does not have a gap, and is harder than those shown in (b) and (c). The spring characteristics are continuously and linearly increased with the displacement while maintaining the characteristics.
Then, when the most part of the gap is almost filled, the increase ratio of the spring characteristics becomes large, and as a result, the spring characteristics show a smooth and continuous rising, and finally reach the maximum displacement and the suspension device side The displacement is controlled to the set limit displacement.

  As described above, in the bound stopper 10 of this embodiment, when the rubber elastic body 14 hits the mating member 48 and acts as a stopper, the rubber elastic body 14 may be deformed while gradually filling the outer gap 40 and the inner gap 42. Therefore, as compared with the bound stopper shown in FIG. 7 (a) which does not have such a gap, the spring characteristic at the time of deformation of the rubber elastic body 14 is lowered as well as the initial hit at the time of stopper action. be able to.

  Moreover, since the rubber elastic body 14 is deformed while gradually filling the outer gap 40 and the inner gap 42 at this time, the spring characteristics change continuously and almost linearly until the outer gap 40 and the inner gap 42 are mostly filled. Can be made.

  However, the outer space 40 in the present embodiment is located on the side of the mounting member 12 opposite to the contact portion 32 of the rubber elastic body 14, and the inner space 42 is elastic from the bottom 16 of the mounting member 12. Since it is provided toward the contact portion 32 side of the body 14, and further, the inner space 42 is located at the core portion (radial core portion) of the rubber elastic body 14, so that the space is on the contact portion side. Unlike the bound stoppers shown in FIGS. 7 (B) and 7 (C), a portion of the rubber elastic body 14 on the contact portion 32 side is partially softened due to these gaps, and the contact portion 32 side is partially formed. In the bound stopper 10 of the present embodiment, the outer gap 40 and the inner gap 42 are gradually increased only when the rubber elastic body 14 is entirely deformed. Wait go.

Therefore, the spring characteristics in the deformation region of the rubber elastic body 14 until the gap is mostly filled are relatively harder than those shown in FIGS. 7 (B) and 7 (C).
As a result, the displacement of the vertically moving members such as the leaf springs of the suspension device in the normal range can be suppressed to be small and the durability life thereof can be increased.

Moreover, in the bound stopper 10 of this embodiment, as shown in FIG. 5, the rapid rise of the spring characteristic of the rubber elastic body 14 in the vicinity of the limit displacement is satisfactorily suppressed, thereby causing the occupant to feel a shock. Can be prevented.
Furthermore, in the bound stopper 10 of this embodiment, the rubber elastic body 14 is buckled during the stopper action even if the free length (deformable height) of the rubber elastic body 14 is increased by the outer gap 40 and the inner gap 42 described above. Has difficult advantages.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the inner gap 42 is appropriately changed in height as shown in FIG. 6 according to the stopper characteristics required for the bound stopper 10, for example, up to a position higher than the peripheral wall portion 18 of the mounting member 12. It can be provided upward or its shape can be various other shapes.
In addition, the present invention can be applied to various other bound stoppers, and can be configured in various modifications without departing from the spirit of the present invention.

It is sectional drawing of the bound stopper which is one Embodiment of this invention. FIG. 2 is a partially cutaway perspective view and a bottom view of the bound stopper of FIG. It is operation | movement explanatory drawing of the bound stopper of the embodiment. FIG. 4 is an operation explanatory diagram following FIG. 3. It is the figure which showed the spring characteristic curve of the bound stopper. It is sectional drawing of other embodiment of this invention. It is a figure which shows an example of the conventional bound stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bound stopper 12 Mounting member 14 Rubber elastic body 16 Bottom part 18 Peripheral wall part 32 Contact part 34 Base end part 36 Gutter-like part 38 Bottom face 40 Outer space | gap 42 Inner space | gap

Claims (8)

(A) A cup-like shape having a bottom portion and an annular peripheral wall portion rising from the outer peripheral end portion of the bottom portion, and a rigid attachment member attached to one of the wheel side vertical movement member and the vehicle body side at the bottom portion; (B) The contact portion at the time of stopper action is protruded from the peripheral wall portion of the mounting member in the axial direction of the mounting member, and the bottom surface opposite to the corresponding portion is fixed to the bottom portion of the mounting member. A block-shaped rubber elastic body provided on the radially inner side of the mounting member in a state, and a bound stopper as a buffer member for restricting excessive displacement of the vertical movement member to the vehicle body side, A radially outer space is provided between the peripheral wall portion of the mounting member and the outer peripheral surface of the rubber elastic body, and extends in the axial direction from the bottom surface toward the contact portion in the central portion of the rubber elastic body. Provide a non-penetrating inner space
A bound stopper, wherein the rubber elastic body is elastically deformed so as to gradually fill the outer gap and the inner gap when the stopper is actuated.   2. The rubber elastic body according to claim 1, wherein the outer peripheral surface of the base end portion on the bottom side of the mounting member is closely attached to the inner peripheral surface of the peripheral wall portion over a predetermined height in the axial direction. The bound stopper is characterized in that the inner gap extends to a position higher on the contact portion side than the close contact portion with the peripheral wall portion.   The bound stopper according to any one of claims 1 and 2, wherein an outer space between the peripheral wall portion and the outer peripheral surface of the rubber elastic body is provided over the entire periphery.   The rubber elastic body according to any one of claims 1 to 3, wherein the rubber elastic body has a shape that increases in diameter from the abutting portion toward the bottom side of the mounting member, and a radial gap width of the outer gap is A bound stopper characterized by being gradually narrowed toward the bottom side.   The bound stopper according to any one of claims 1 to 4, wherein in the inner gap, a radial gap width gradually increases toward a bottom side of the mounting member.   3. The rubber elastic body according to claim 2, wherein the rubber elastic body has a flange-like portion that protrudes radially outward in an outer peripheral portion of the base end portion, and an outer peripheral surface of the flange-like portion is in close contact with the peripheral wall portion. Bound stopper, characterized by   The bound stopper according to claim 1, wherein the inner gap is lower than a height of the peripheral wall portion in the axial direction.   The bound stopper according to claim 1, wherein the inner gap is higher than the height of the peripheral wall portion in the axial direction.

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