JP2006097775A - Vehicular cushion rubber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular cushion rubber for securing good durability even under axial repeated compressive deformation while maintaining deflection load property which brings the sudden rise of low deflection load in a low displacement region or deflection load when exceeding the amount of deflection in the low displacement region. <P>SOLUTION: The vehicular cushion rubber 1 comprises an outer periphery bored groove 25 provided in the side face of a body portion adjacent to the abutting face of a door or an engine hood abutting on a vehicle body or an opening/closing member and an abutting boss 21 formed on the outer edge of the abutting face. Herein, ϕA≥ϕB is established, where ϕA is the inner periphery diameter of the boss 21 and ϕB is the inner periphery diameter of the bored groove. This construction produces superior durability while selecting a simple deflective deformation region or a compressive deformation region when axial load is applied to the boss at the front end of the body portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicular cushion rubber disposed at a contact portion between an opening / closing member such as a door and an engine hood and a vehicle body.

  Cushion rubber is used between an opening / closing member such as an automobile door and an engine hood and the vehicle body to absorb impact during opening / closing operation and to prevent noise during traveling. As shown in FIG. 6, the door cushion has a lap structure that is always in contact with the other part in order to prevent abnormal noise during traveling, and if there is a step in the parting part due to uneven construction of the door, it looks good. There is a problem of getting worse.

As a technique for solving the above problems, Patent Document 1 discloses a cushion rubber in which a ring-shaped groove perpendicular to the load direction is provided on the outer peripheral surface of a columnar main body.
Japanese Utility Model Publication No. 6-49834

  According to the cushion disclosed in Patent Document 1, it is possible to realize a deflection load characteristic in which a deflection load with respect to a deflection amount in a low displacement region is reduced and the deflection load rapidly increases when the deflection amount in the low displacement region is exceeded. However, as in Patent Document 1, in the case of a structure in which the central portion and the ring groove are thinned to reduce the volume of the compression portion, the elastic wall constituting the bottom of the groove portion that is a ring-shaped thin portion is axially formed Since the compression deformation is concentrated, there is a problem in durability due to repetition.

  Accordingly, an object of the present invention is to maintain the above-described shaft while maintaining the flexural load characteristics that cause a rapid increase in the flexural load when the low flexural load in the low displacement region and the flexure amount in the low displacement region are exceeded. An object of the present invention is to provide a cushion rubber for a vehicle that can ensure good durability against repeated compression deformation in a direction.

  The cushion rubber for a vehicle of the present invention made to solve the above-mentioned problems is the outer periphery of the side surface of the body part in the vicinity of the contact surface of the front end of the body part that contacts an opening / closing member such as a door or an engine hood or the vehicle body and receives an impact load. It has a straight groove and an abutting protrusion at the tip of the body, and when the inner peripheral diameter of the abutting protrusion is φA and the inner diameter of the straight groove is φB, φA ≧ φB. With this configuration, when an axial load is applied to the contact protrusion at the tip of the body, the flexure load in the low displacement area is reduced due to the presence of the straight groove, and the low displacement area is simply deformed. As described above, excellent durability can be obtained by switching between the compression deformation and the deformation mode in the high displacement region.

  The shape of the cushion rubber is preferably (φA−φB) / 2 ≧ T, where T is the thickness from the contact surface at the tip of the body portion to the straight groove. By adopting such a configuration, the deformation when the contact protrusion is displaced can be a simple deflection deformation, the deflection load can be suppressed lower, and the durability of the cushion portion becomes better.

  Furthermore, among the shapes of the cushion rubber, it is preferable that D ≧ C, where C is the height of the contact protrusion and D is the width of the straight groove. With such a configuration, when an axial load is applied to the contact protrusion at the tip of the body, the presence of the straight groove makes it possible to make the cushion part a simple deflection instead of a crushing deformation. Sex can be obtained.

  Moreover, it is preferable that at least the body portion tip of the cushion rubber is made of a peroxide vulcanized rubber vulcanizate. By adopting such a configuration, it is possible to prevent discoloration of the vehicle body painted surface that comes in contact with the cushion rubber contact portion, and to prevent the cushion rubber contact portion and the vehicle body painted surface from being fixed.

With the above configuration, the deflection load with respect to the deflection amount in the low displacement region is reduced, and when the deflection amount exceeds the deflection amount in the low displacement region, the deflection load characteristic is that the deflection load increases rapidly. On the other hand, excellent durability can be obtained by switching the compression deformation and the deformation mode of the high displacement region by using the low displacement region as a simple flexural deformation. As a result, it is possible to obtain stable performance of absorbing variation in construction and generating overstroke load resistance.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.

Example 1
FIG. 1 is a cross-sectional view showing a cushion rubber according to the first embodiment of the present invention, and FIG. 2 shows a state where a mating part comes into contact with the cushion rubber in FIG. It is sectional drawing which shows the cushion rubber of the state which the contact protrusion has displaced. As shown in FIG. 1, the cushion rubber according to the present invention is formed integrally with an engagement member 10 to be attached to one of an opening / closing member such as a door and an engine hood or a vehicle body, and the opening / closing It has a cushion body portion 20 that abuts against the other of the member or the vehicle body and receives an impact load, and has a low load displacement portion 27 that allows displacement in a low displacement region at its tip portion. Further, the low load displacement portion 27 has a contact protrusion 21 at the tip and a low load displacement base portion 23 having a contact surface 22 on one side thereof connected to the cushion body main body portion 26 by a straight groove inner diameter portion 24. By setting the inner diameter φA of the abutting protrusion 21 to be larger than the inner diameter φB of the straight groove 25, the abutting protrusion 21 is only flexibly displaced in the cushion rubber axial direction as shown in FIG. The rubber itself is not accompanied by compressive deformation. At this time, the displacement load in the low displacement region can be adjusted by setting the thickness of the low load displacement base 23. Further, the contact protrusion 21 is provided in a rib shape continuous to the entire periphery of the outer edge of the contact surface 22 at the tip of the cushion body portion 20, but is not limited to a continuous shape, for example, as shown in FIG. A shaped protrusion or the like may be provided intermittently.

FIG. 4 is a diagram schematically showing a deflection-load curve when the cushion rubber according to the first embodiment of the present invention is deformed.
A process in which an unillustrated counterpart part applies axial compression to the cushion body 20 in the state of FIG. 1 will be described. When the mating part comes into contact with the contact protrusion 21 and compresses in the axial direction, the contact protrusion 21 is displaced with a small increase in load. This is because the low load displacement base 23 provided with the contact protrusion 21 is supported only by the inner diameter portion 24 of the straight groove, and is in a floating state in the range of the straight groove 25. This is because it is a simple deflection deformation. For this reason, the low load displacement base 23 is not subjected to excessive strain and large stress, and is excellent in durability and excellent in followability to displacement. By setting the installation exact size that allows for the range of door installation variation in this low load displacement region, parts will not be subjected to an excessive load against the variation. When the predetermined amount of displacement is reached, the unillustrated counterpart part comes into contact with the contact surface 22 and enters the state shown in FIG. 2, and further, when the internal groove 24 of the straight groove is compressed and deformed, the straight groove of the low load displacement base 23 is obtained. The surface comes into contact with the upper surface of the cushion body main body 26 and compresses and deforms the contact protrusion 21 and the low load displacement base 23. For this reason, when the counterpart part reaches the contact surface 22, the deformation mode is switched from a simple deflection deformation region to a compression deformation region, and the deflection load curve increases rapidly. This sudden increase in the deflection load exerts a stopper effect against the overstroke of an opening / closing object such as a door. Thus, by bringing the upper limit of the built-in variation closer to the inflection point of the deflection-load curve, the load can be rapidly increased and the stopper can be applied when the built-up variation range is exceeded.

(Example 2)
FIG. 5 is a cross-sectional view showing a cushion rubber according to a second embodiment of the present invention. Since the cushion rubber 3 of the second embodiment shown in FIG. 5 is different from the first embodiment only in the material of the low load displacement portion 37, only this portion will be described. In the cushion rubber 3 of the present invention, the low load displacement portion 37 is made of a peroxide vulcanized rubber vulcanizate. By setting it as such specification, the vehicle body coating surface which a cushion rubber contact part contacts does not discolor, and also a cushion rubber contact part and a vehicle body coating surface do not stick easily. For this reason, the tearing failure at the time of opening and closing by adhesion with the low load displacement part 37 and the vehicle painting surface which are lip-shaped can be prevented.

  In addition, this invention is not restricted to the said embodiment, In the range which does not deviate from the summary, it is possible to implement in various aspects.

It is sectional drawing of the cushion rubber which is the 1st Embodiment of this invention. It is a modification sectional view of cushion rubber which is a 1st embodiment of the present invention. It is a perspective view of the modification of the cushion rubber which is the 1st Embodiment of this invention. It is a deflection-load curve figure of cushion rubber which is a 1st embodiment of the present invention. It is sectional drawing of the cushion rubber which is the 2nd Embodiment of this invention. It is sectional drawing of the conventional cushion rubber specification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cushion rubber | gum 3 of 1st Example Cushion rubber | gum 10 of 2nd Example Engagement part 20 Cushion body part 21 Contact protrusion 22 Contact surface 23 Low load displacement base part 24 Straight groove inner diameter part 25 Straight groove 26 Cushion body main-body part 27 Low load displacement part 37 Low load displacement part

Claims (4)

  It is provided at a part where the vehicle body abuts on an opening / closing part such as a door or an engine hood, and is brought into contact with one of the opening / closing part or the vehicle body and the other of the vehicle body or the opening / closing part to apply an impact load. In the vehicle cushion rubber comprising the receiving body part, the body part is formed on the outer peripheral straight groove provided on the side surface of the body part adjacent to the contact surface that contacts the vehicle body or the opening / closing member and the outer edge part of the corresponding contact surface. A vehicular cushion rubber, wherein φA ≧ φB, where φA ≧ φB when the inner circumferential diameter of the abutting projection is φA and the inner circumferential diameter of the straight groove is φB.   2. The vehicle cushion rubber according to claim 1, wherein (φA−φB) / 2 ≧ T, where T is a thickness from an abutting surface of the body portion tip to the straight groove.   The vehicle cushion rubber according to claim 1, wherein D ≧ C, where C is a height of the contact protrusion and D is a width of the straight groove. 4. The vehicle cushion rubber according to claim 1, wherein at least a tip of the body portion is made of a peroxide vulcanized rubber vulcanizate.

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