JP2018135924A - Vibration control device for opening/closing door for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device for an opening/closing door for vehicle capable of maintaining a performance of vibration control support in a closed state of the opening/closing door for vehicle or displacement regulation actuation and shock relaxation during a closing actuation stably for a long time.SOLUTION: The present invention relates to a vibration control device 10 for an opening/closing door for vehicle comprising a cushion body 12 attached to an opening/closing door 20 for vehicle or a body skeleton 18 of a vehicle. In a state where the opening/closing door 20 for vehicle is closed, the cushion body 12 is compressed between the opening/closing door 20 for vehicle and the body skeleton 18. The cushion body 12 includes a high-attenuation elastic body 14 and a low-settlement elastic body 16. A loss tangent (tanδ) of the high-attenuation elastic body 14 is set to 0.3 or more. Compression permanent distortion of the low-settlement elastic body 16 is set to 25% or less in a case where the low-settlement elastic body is compressed for 70 hours under a temperature condition of 85°C. Further, hardness of the high-attenuation elastic body 14 is made higher than that of the low-settlement elastic body 16.SELECTED DRAWING: Figure 1

Description

  The present invention reduces the impact of a vehicle door such as an automobile door, an engine hood (bonnet), a trunk lid, and the like when closing the vehicle, and also supports the vehicle body in an anti-vibration manner while the vehicle door is closed. The present invention relates to a vibration isolator for an open / close door.

  Conventionally, a cushion rubber such as a door stopper has been provided in order to reduce an impact when a vehicle door such as an automobile door, an engine hood, or a trunk lid is closed. In addition, for the purpose of preventing rattling of the vehicle door and improving the rigidity of the vehicle, the cushion rubber is compressed between the vehicle door and the vehicle body when the vehicle door is closed. It has also been proposed to use rubber as an anti-vibration device for a vehicular door that connects the vehicular door and the vehicle body in a vibration-proof manner. For example, in Japanese Patent No. 4492572 (Patent Document 1), a compressed cushion state in which a soft cushion rubber provided in an engine hood and a hard cushion rubber provided in a radiator support upper are in contact with each other when the engine hood is closed. Is supposed to be retained. As a result, the engine hood is supported by the radiator support upper in the closed state.

  Incidentally, as in Patent Document 1, in a structure in which the cushion rubber is held in a compressed state between the engine hood and the radiator support upper in a closed state of the engine hood, the cushion rubber is used when the vehicle door is closed. In addition to having excellent damping performance capable of exhibiting the effect of mitigating impact, it is also required to have vibration insulation performance against vibration input in a closed state. In Patent Document 1, the first cushion rubber is a hard cushion rubber, and the second cushion rubber is a soft cushion rubber, thereby realizing the required load-deformation characteristics.

  However, in Patent Document 1, since the cushion rubber is held in a compressed state for a long period of time, further improvements are required in terms of maintaining the performance and durability of the cushion rubber.

Japanese Patent No. 4492572

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a vibration-proof support characteristic in a closed state of a target vehicle opening / closing door, a displacement regulating action in a closing operation, and shock mitigation. An object of the present invention is to provide a vibration isolator for a vehicle opening / closing door having a novel structure capable of stably maintaining the operation and the like over a long period of time.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention includes a cushion body that is attached to either the vehicle door or the vehicle body skeleton and is disposed between the vehicle door and the body skeleton. A vibration isolator for a vehicle door, wherein the cushion body is compressed between the vehicle door and the body skeleton when the vehicle door is closed, and the cushion body is A high damping elastic body and a low sag elastic body are provided, the loss tangent (tan δ) of the high damping elastic body is 0.3 or more, and the compression set of the low sag elastic body is 85 ° C. When compressed for 70 hours under the above temperature conditions, it is 25% or less, and the high-damping elastic body is harder than the low-sag elastic body.

  According to the vibration isolator for a vehicle opening / closing door having the structure according to the first aspect, since the cushion body includes a hard high-damping elastic body and a soft low-sliding elastic body, the vehicle opening / closing door is provided. Can be stably obtained over a long period of time with excellent durability.

  In other words, the hard high-damping elastic body with a small amount of deformation with respect to the load exerts a sufficient displacement regulating action when the vehicle door is closed, and direct contact between the vehicle door and the body skeleton is effective. To be prevented. Further, the high damping elastic body has a loss tangent (tan δ) of 0.3 or more and exhibits an excellent damping action against vibrations. Therefore, when the vehicle door is closed or closed, The vibration of the door can be reduced by the damping action of the high damping elastic body.

  On the other hand, the cushion body can be deformed following the relative displacement of the vehicle door with respect to the body skeleton by a soft low-sag elastic body with a large amount of deformation with respect to the load. The anti-vibration connection state via the cushion body is stably maintained. Furthermore, due to the vibration insulation action of the flexible low-sag elastic body, minute vibrations input to the body skeleton are not easily transmitted to the vehicle door, and rattling or the like when the vehicle door is closed can be prevented. . In addition, a low-sag elastic body that is softer than a high-damping elastic body has a relatively large amount of deformation with respect to the input, but 25% when the compression set is compressed over 70 hours under a temperature condition of 85 ° C. Therefore, even if it is in a compressed state for a long period of time, a decrease in performance due to permanent strain is unlikely to be a problem, and excellent durability can be realized.

  According to a second aspect of the present invention, in the vibration isolator for a vehicle door described in the first aspect, the high damping elastic body and the low sag elastic body close the vehicle door. The cushion bodies are arranged in series along the compression direction.

  According to the second aspect, when the cushion body is compressed between the body skeleton and the vehicle door, the high damping elastic body and the low elastic body arranged in series are respectively elastic according to the input. Deform. Thereby, when the amount of compressive deformation of the cushion body is small, the elastic body is mainly elastically deformed, and the flexible support of the vehicle opening / closing door due to the soft characteristics and the vibration insulation action are exhibited. When the amount of compressive deformation of the cushion body is large, a displacement restricting action of the vehicle door due to the hard spring characteristic of the high damping elastic body, a damping action due to elastic deformation of the high damping elastic body, and the like are exhibited.

  According to a third aspect of the present invention, in the vibration isolator for a vehicle opening / closing door described in the second aspect, the high damping elastic body is attached to either the vehicle opening / closing door or the body skeleton. It constitutes the base end portion of the cushion body.

  According to the third aspect, the cushion body can be attached to the vehicle opening / closing door or the body frame in a stable state by configuring the base end portion of the cushion body by the relatively hard high-damping elastic body. .

  According to a fourth aspect of the present invention, in the vibration isolator for a vehicle door described in any one of the first to third aspects, the high damping elastic body and the low sag elastic body are for the vehicle. It is arrange | positioned in parallel with respect to the compression direction of the said cushion body in the state which closed the opening-and-closing door.

  According to the fourth aspect, when the cushion body is compressed, both the high damping elastic body and the low sag elastic body have substantially the same amount of elastic deformation. Avoided. Further, since the high damping elastic body and the low sag elastic body are compressed almost simultaneously, the load-deformation characteristics of the cushion body can be made closer to a linear shape.

  According to a fifth aspect of the present invention, in the vibration isolator for a vehicle door described in the fourth aspect, the high damping elastic body and the low sag elastic body are arranged coaxially. .

  According to the fifth aspect, when the cushion body is compressed, the cushion body is compressed and deformed in a well-balanced manner, and the cushion body becomes difficult to deform so as to fall down. .

  According to a sixth aspect of the present invention, in the vibration isolator for a vehicle door described in the fifth aspect, the high-damping elastic body is disposed on the inner peripheral side of the low-hanging elastic body. is there.

  According to the sixth aspect, for example, the high damping elastic body is formed in a columnar shape and the low sag elastic body is cylindrical, so that the hard spring characteristic of the high damping elastic body and the soft spring of the low sag elastic body are obtained. The characteristic is easily realized by the shape of the elastic body. Further, when the cushion body comes into contact with the vehicle opening / closing door or the body skeleton in the inclined direction in the closing operation of the vehicle opening / closing door, the soft low-declining elastic body comes into contact first, Impact is reduced.

  According to a seventh aspect of the present invention, in the vibration isolator for a vehicle door described in any one of the first to sixth aspects, any one of the high damping elastic body and the low sag elastic body. A recess is formed in the boundary surface, and the other of the high damping elastic body and the low sag elastic body enters the recess.

  According to the seventh aspect, the portion entering the recess in either the high damping elastic body or the low sag elastic body is strongly compressed while the free surface is constrained when the cushion body is compressed, and the damping is performed. The action can be exhibited more effectively.

  According to an eighth aspect of the present invention, in the vibration isolator for a vehicle door described in any one of the first to seventh aspects, the high damping elastic body is a styrene rubber or a butyl rubber. It is what.

  According to the eighth aspect, it is possible to easily obtain a highly damped elastic body having a large loss tangent and excellent damping performance by using styrene rubber or butyl rubber.

  According to a ninth aspect of the present invention, in the vibration isolator for a vehicle door described in any one of the first to eighth aspects, the low sag elastic body is natural rubber or butadiene rubber. It is what.

  According to the ninth aspect, it is possible to easily obtain a low-sag elastic body with a small compression set by natural rubber or butadiene rubber.

  According to a tenth aspect of the present invention, in the vibration isolator for a vehicle door described in any one of the first to ninth aspects, the low sag elastic body is a tip side of the high damping elastic body. And a serially arranged portion arranged in parallel with the highly damped elastic body.

  According to the tenth aspect, when the vehicle door is closed, the series arrangement portion arranged in series on the front end side of the high damping elastic body is preferentially compressed and deformed, so that the initial deformation is soft. Spring characteristics are realized, and sag is prevented by reducing the strain of the highly damped elastic body.

  Also, when a large compressive load is applied to the vibration isolator, for example, when closing the vehicular door, the low sag elastic body is located not only in the serially arranged portion but also in the parallel arranged portion between the body skeleton and the vehicular open / close door. By being sandwiched between, a harder spring characteristic is exhibited. Accordingly, the relative displacement amount of the vehicle door with respect to the body skeleton is more effectively limited, and the vehicle door can be held at an appropriate relative position with respect to the body skeleton.

  According to the present invention, the cushion body includes the hard high-damping elastic body and the soft low-sag elastic body, and the loss tangent (tan δ) of the high-damping elastic body is 0.3 or more and the low-sagging is performed. The compression set of the elastic body is 25% or less when it is compressed for 70 hours under a temperature condition of 85 ° C. It is possible to stably obtain an impact absorbing action, a displacement regulating action, and the like during the door closing operation over a long period of time.

The perspective view which shows the vibration isolator of the opening / closing door for vehicles as 1st embodiment of this invention. The longitudinal cross-sectional view of the vibration isolator of the vehicle door shown in FIG. The longitudinal cross-sectional view which shows the mounting state to the vehicle of the vibration isolator of the vehicle door shown in FIG. 1 in the closed state of a door. The table | surface which shows the experimental result which measured tan (delta) of the vibration isolator of the vehicle door shown in FIG. The perspective view which shows the vibration isolator of the vehicle door as 2nd embodiment of this invention. The longitudinal cross-sectional view of the vibration isolator of the vehicle door shown in FIG. The perspective view which shows the vibration isolator of the vehicle door as 3rd embodiment of this invention. The longitudinal cross-sectional view of the vibration isolator of the vehicle door shown in FIG. The longitudinal cross-sectional view which shows the mounting state to the vehicle of the vibration isolator of the vehicle door shown in FIG. 7 in the closed state of a door. The figure which shows the simulation result of the strain distribution at the time of compressing the vibration isolator of the door for vehicles. The longitudinal cross-sectional view which shows the vibration isolator of the opening-and-closing door for vehicles as another embodiment of this invention. The longitudinal cross-sectional view which shows the vibration isolator of the vehicle door as another one Embodiment of this invention in the closed state of the door in the mounting state to a vehicle.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a vibration isolator 10 for a vehicle door as a first embodiment of the present invention (hereinafter referred to as a vibration isolator 10). The vibration isolator 10 includes a cushion body 12 formed of an elastic body having a substantially cylindrical shape, and the cushion body 12 includes a high damping elastic body 14 and a low sag elastic body 16 arranged in series in the axial direction. It is made the structure. In the description of this embodiment, the vertical direction means the vertical direction in FIG. 2 that is the axial direction of the cushion body 12 in principle.

  More specifically, the high-damping elastic body 14 has a substantially cylindrical shape and is formed of rubber, thermoplastic resin elastomer, or the like. The highly damped elastic body 14 has a loss tangent (tan δ) of 0.3 or more when vibration with a frequency of 25 Hz and an amplitude of ± 0.5 mm is input under room temperature conditions, and converts kinetic energy into heat energy. Excellent energy attenuation performance based on viscosity. The dynamic properties including the loss tangent of the highly damped elastic body 14 can be specified based on, for example, “vulcanized rubber and thermoplastic rubber—how to obtain dynamic properties” of JIS K6394.

  The material for forming the high-damping elastic body 14 is not particularly limited. For example, styrene-based rubber or butyl-based rubber is employed, and examples thereof include styrene-butadiene rubber (SBR), isobutylene isoprene rubber (IIR), and ethylene propylene. Rubber (EPDM) or the like is preferably used. In addition, the material for forming the high-damping elastic body 14 may be a thermoplastic elastomer. For example, SBR having a different polymerization method from that of synthetic rubber may be suitably employed.

  The low sag elastic body 16 has a substantially cylindrical shape similar to the high damping elastic body 14, and is formed of rubber, thermoplastic resin elastomer, or the like. Further, the low set elastic body 16 has a compression set of 25% or less when continuously compressed in the vertical direction for 70 hours under a temperature condition of 85 ° C. In addition, the measuring method of the compression set of the low sag elastic body 16 is defined in ISO 815 and JIS K6262 based thereon “vulcanized rubber and thermoplastic rubber—how to obtain compression set at normal temperature, high temperature and low temperature” According to

  The material for forming the low sag elastic body 16 is not particularly limited. For example, natural rubber (NR) and butadiene rubber (BR, etc.) are preferably used. Furthermore, as a material for forming the low sag elastic body 16, acrylonitrile butadiene rubber (NBR), ethylene propylene rubber (EPM, EPDM), or the like can be suitably employed.

  Further, the high damping elastic body 14 is harder than the low sag elastic body 16. Therefore, the highly damped elastic body 14 has a lower amount of elastic deformation with respect to the load or is smaller than the elastic body 16. The hardness of the high damping elastic body 14 and the low sag elastic body 16 may be specified based on, for example, “vulcanized rubber and thermoplastic rubber—determining hardness” defined in JIS K6253-2. it can.

  The high damping elastic body 14 and the low sag elastic body 16 are arranged in series in the vertical direction. In the present embodiment, the cushion body 12 is formed by integrally forming the high damping elastic body 14 and the low sag elastic body 16 by two-color molding. Further, the diameter of the high damping elastic body 14 and the diameter of the low sag elastic body 16 are substantially the same. In this embodiment, the thickness L1 of the high damping elastic body 14 and the thickness of the low sag elastic body 16 are the same. The thickness dimension L2 is substantially the same. In FIG. 1, the boundary between the high damping elastic body 14 and the low sag elastic body 16 is virtually indicated by a two-dot chain line.

  For example, as shown in FIG. 3, the cushion body 12 having such a structure is disposed between a body skeleton 18 of an automobile and a door 20 as a vehicle opening / closing door. More specifically, the cushion body 12 is configured such that the high damping elastic body 14 is attached to the body skeleton 18, and the low-height elastic body 16 on the protruding tip side is attached to the door 20 in the closed state of the door 20. It is being pressed. In this embodiment, since the vibration isolator 10 is comprised by the cushion body 12, the vibration isolator 10 is mounted | worn with a vehicle by attaching the cushion body 12 to the body frame | skeleton 18. FIG. When the vibration isolator 10 is mounted on the vehicle, the high damping elastic body 14 constitutes the base end portion of the cushion body 12 attached to the body skeleton 18, and the low sag elastic body 16 is on the door 20 side. This constitutes the leading end.

  Thereby, in the closed state in which the door 20 is closed, the cushion body 12 is compressed in the axial direction (vertical direction in FIG. 3) between the body skeleton 18 and the door 20, and the body skeleton 18 and the door 20. Is intervening. Since the cushion body 12 has a structure in which a hard high-damping elastic body 14 and a soft low sag elastic body 16 are arranged in series in the axial direction, the cushion body 12 is highly compressed when compressed between the body skeleton 18 and the door 20. The deformation amount of the damping elastic body 14 is low or smaller than the deformation amount of the elastic body 16, and the thickness dimension L 1 ′ after deformation of the high damping elastic body 14 is low or the thickness dimension L 2 after deformation of the elastic body 16. Is bigger than '.

  In such a state where the vibration isolator 10 is mounted on the vehicle, the vibration (flapping) of the door 20 is reduced by the vibration damping action or the vibration insulation action of the cushion body 12. Furthermore, since the door 20 is supported by the body skeleton 18 via the vibration isolator 10, the closed door 20 also functions as a reinforcing material for the body skeleton 18 and the rigidity of the body skeleton 18 is substantially increased. As a result, it is possible to improve the vibration state of the vehicle and the driving performance. In particular, the cushion body 12 of the vibration isolator 10 has a structure in which the high damping elastic body 14 and the low heel elastic body 16 are arranged in series, and the tip of the cushion body 12 is a soft low heel elastic body 16. Since it is comprised, the door 20 is flexibly supported by the cushion body 12, and the vibration isolation of the door 20, the integral support with respect to the body frame | skeleton 18, etc. are implement | achieved advantageously.

  Further, when the door 20 is moved from the open state to the closed state, the impact load in the axial direction is input to the vibration isolator 10 so that the cushion body 12 is further compressed in the axial direction. In this case, since the amount of displacement of the door 20 is limited by the highly damped elastic body 14 whose deformation amount with respect to the load is relatively small, the door 20 is prevented from hitting the body skeleton 18. Moreover, the high damping elastic body 14 is formed of a material having a large loss tangent (tan δ), and the kinetic energy of the door 20 input to the cushion body 12 is efficiently reduced by the damping action of the high damping elastic body 14. The Therefore, the door 20 is supported at an appropriate position with respect to the body skeleton 18, and the door 20 is held in the closed state.

  In the cushion body 12 of the present embodiment, the high damping elastic body 14 and the low sag elastic body 16 are provided side by side in series in the axial direction. In addition, the soft low elastic body 16 is mainly compressed and deformed. Here, since the compression elastic strain of the low sag elastic body 16 is reduced, even if it is compressed relatively large in the closed state of the door 20, the cushion body due to the permanent strain of the low sag elastic body 16. Twelve dimensional changes can be suppressed. On the other hand, since the highly damped elastic body 14 having a relatively large compression set is harder than the elastic body 16, the amount of compressive deformation is relatively small. Therefore, even if the closed state of the door 20 in which the vibration isolator 10 is compressed between the body skeleton 18 and the door 20 continues for a long period of time, the high damping elastic body 14 and the low sag elastic body 16 are made permanent. Strain is suppressed, and the axial dimension of the cushion body 12 can be prevented from changing over time. Accordingly, the vibration isolation performance by the vibration isolation device 10 and the support performance of the door 20 are maintained over a long period of time, and the door 20 is positioned at an appropriate position with respect to the body frame 18 even when the door 20 is closed. Can do.

  It should be noted that, in order to advantageously obtain a cushioning property at the initial stage of contact of the cushion body 12 with the door 20, it is desirable that the soft low-sag elastic body 16 is disposed on the tip side of the hard high-damping elastic body 14. The low-sag elastic body 16 may be attached to the body skeleton 18, and the high-damping elastic body 14 may be disposed on the tip side of the low-sag elastic body 16.

  By the way, the table of FIG. 4 shows samples (1) in which the ratio of the thickness dimension L1 of the high-damping elastic body 14 to the thickness dimension L2 of the low-sag elastic body 16 in the cushion body 12 of the vibration isolator 10 is different. The results of measuring loss tangent (tan δ) and strain using sample (5) are shown.

  In the sample (1), since the thickness L2 of the elastic body 16 is set to 0, the entire cushion body 12 is formed of the high damping elastic body 14. On the other hand, in the sample (5), since the thickness L1 of the highly damped elastic body 14 is 0, the entire cushion body 12 is lowered or formed by the elastic body 16. In short, the sample (1) and the sample (5) are comparative examples for confirming the performance obtained by only one of the high damping elastic body 14 and the low sag elastic body 16, and substantially the whole. It is a conventional vibration isolator for vehicle doors made of a single material.

  Samples (2) to (4) are examples in which the ratio of the thickness dimension L1 of the high damping elastic body 14 and the thickness dimension L2 of the low sag elastic body 16 is different from each other. 2) is L1: L2 = 8: 2, sample (3) is L1: L2 = 7: 3, and sample (4) is L1: L2 = 5: 5. In the samples (1) to (5), the high damping elastic body 14 is formed of butyl rubber, and the low sag elastic body 16 is formed of rubber obtained by mixing natural rubber and butadiene rubber. .

  First, for each of the samples (1) to (5), a vibration load having a frequency of 25 Hz and an amplitude of ± 0.5 mm is input in the axial direction under room temperature conditions, and the loss tangent (tan δ) of each sample is resonated. Measured by the method. According to the result of FIG. 4, the loss tangent increases as the ratio of the high-damping elastic body 14 increases, and in the samples (1) to (4), the loss tangent is set to 0.3 or more, resulting in viscosity. It can be confirmed that the high damping performance based on it is feasible.

  Next, the permanent set when compressed for 70 hours under a temperature condition of 85 ° C. was measured. According to the result of FIG. 4, the permanent set becomes smaller as the sample becomes lower or the ratio of the elastic body 16 is larger.

  According to the experimental results shown in the table of FIG. 4, particularly in the sample (3) and the sample (4), it is possible to achieve both the damping performance (tan δ) superior to the conventional product and a small permanent strain. did it. Therefore, it has been confirmed by experiments that the vibration damping device for a vehicular door according to the present invention can achieve both excellent damping performance (tan δ) and small permanent strain, which were difficult with conventional products.

  In addition, FIG. 4 shows the rate of change in thickness due to repeated compression loads when a vibration having an amplitude of 0.2 to 1.8 mm is applied in the axial direction at room temperature under conditions of 500,000 times And hereinafter referred to as dynamic sag.) The measurement results are also shown. According to this, the dynamic sag is smaller as the sample sag is lower or the elastic body 16 is larger.

  5 and 6 show a vibration isolator 30 for a vehicle opening / closing door (hereinafter referred to as a vibration isolator 30) as a second embodiment of the present invention. The vibration isolator 30 of the present embodiment is a cushion body 32 that is entirely formed of an elastic body, and the cushion body 32 is configured by a high damping elastic body 34 and a low-sag elastic body 36. In addition, in the following description, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  The cushion body 32 of the present embodiment has a structure in which a substantially cylindrical high-damping elastic body 34 is coaxially arranged on the inner periphery of a substantially cylindrical low-hanging elastic body 36. The low sag elastic body 36 is arranged in parallel with respect to the axial direction (the vertical direction in FIG. 6) that is the compression direction of the cushion body 32. In short, the high damping elastic body and the low sag elastic body constituting the cushion body are arranged in series with respect to the compression direction of the cushion body as in the first embodiment, and the cushion as in this embodiment. It can also be arranged in parallel to the direction of body compression. As the material for forming the high damping elastic body 34 and the low sag elastic body 36, the same material as that for forming the high damping elastic body 14 and the low sag elastic body 16 of the first embodiment can be employed. .

  According to the vibration isolator 30 having the structure according to the present embodiment, when the cushion body 32 is compressed in the axial direction between the body skeleton (not shown) and the door in the mounted state on the vehicle, the highly damped elastic body. 34 and the elastic body 36 are compressed with substantially the same amount of deformation. Thereby, only the elastic body 36 is prevented from being excessively deformed, and the durability of the elastic body 36 is improved.

  In addition, since the high damping elastic body 34 and the low sag elastic body 36 having different spring characteristics are compressed and deformed substantially simultaneously and approximately by the same amount with respect to the input, the change of the spring characteristics with respect to the amount of compressive deformation of the cushion body 32 changes. It is suppressed, and an impact caused by a sudden change in spring characteristics is prevented.

  In addition, since the columnar high damping elastic body 34 is disposed on the inner periphery of the cylindrical low sag elastic body 36, the hard high damping elastic body 34 and the soft low sag elastic body 36 are realized in terms of shape. It becomes easy to do. In addition, when the cushion body 32 and a door (not shown) are in contact with each other in a direction inclined with respect to the axial direction of the cushion body 32, the soft low-sag elastic body 36 is in contact with the door. Is alleviated.

  FIGS. 7 and 8 show a vibration isolator 40 for a vehicle opening / closing door (hereinafter referred to as a vibration isolator 40) as a third embodiment of the present invention. The vibration isolator 40 of the present embodiment is a cushion body 42 that is entirely formed of an elastic body, and the cushion body 42 is configured by a high damping elastic body 44 and a low-sag elastic body 46. As the material for forming the high damping elastic body 44 and the low sag elastic body 46, the same material as the material for forming the high damping elastic body 14 and the low sag elastic body 16 of the first embodiment can be adopted. Then, explanation is omitted.

  More specifically, the high-damping elastic body 44 has a weight-like shape as a whole, and has a shaft-shaped portion 48 that is a large-diameter, generally cylindrical shape, and a fixing that protrudes upward from the shaft-shaped portion 48. The unit 50 is integrally provided. Further, a groove-like recess 52 that opens to the outer peripheral surface is formed in the lower portion of the fixing portion 50 in the highly damped elastic body 44. Since the fixing portion 50 of the high damping elastic body 44 is covered with a low sag elastic body 46 which will be described later, the surface of the fixing portion 50 is a boundary surface between the high damping elastic body 44 and the low sag elastic body 46. Thus, the recess 52 is open to the boundary surface. Since such a recess 52 is formed, the fixed portion 50 of the present embodiment has a larger diameter at the upper part from the recess 52 than at the lower part where the recess 52 is formed. In the present embodiment, the attachment portion 53 that protrudes downward from the radial center portion of the shaft-like portion 48 is integrally formed. The attachment portion 53 has a lower portion with a larger diameter than the upper portion, and the lower portion with the large diameter is locked to the body skeleton 18.

  The low-sag elastic body 46 is fixed so as to cover the upper surface of the high-damping elastic body 44, and has a substantially frustoconical outer shape as a whole. Further, a series arrangement portion 54 that is arranged in series on the upper end side of the high damping elastic body 44 and fixed to the upper surface of the fixing portion 50 of the high damping elastic body 44, and the outer periphery of the upper portion of the high damping elastic body 44 And a parallel arrangement portion 56 that is arranged in parallel so as to surround and fixed to the outer peripheral surface of the high-damping elastic body 44.

  Furthermore, the low-hanging elastic body 46 is provided with a convex portion 58 that protrudes toward the inner periphery, and the convex portion 58 has a shape corresponding to the recess 52 of the high-damping elastic body 44. The convex portion 58 is disposed so as to enter a recess 52 formed between the shaft-like portion 48 of the high damping elastic body 44 and the upper portion of the fixing portion 50, and is fixed to the inner surface of the recess 52. . The low sag elastic body 46 is fixed so as to cover the entire surface of the fixing portion 50 of the high damping elastic body 44 and is also fixed to the upper end portion of the shaft-like portion 48 of the high damping elastic body 44. It protrudes from the shaft-like portion 48 to the outer periphery.

  As shown in FIG. 9, the vibration isolator 40 having such a structure is attached to the vehicle by attaching the lower end portion of the high damping elastic body 44 of the cushion body 42 to the body skeleton 18. The body skeleton 18 of the present embodiment is formed with a recess that is open on the upper surface and into which the shaft-like portion 48 of the high-damping elastic body 44 is fitted, and is vertically penetrated through the bottom wall portion of the recess. A through hole through which the upper portion of the attachment portion 53 of the damping elastic body 44 is inserted is formed, and the lower portion of the attachment portion 53 is locked to the body skeleton 18 with the upper portion of the attachment portion 53 inserted into the through hole. It has become so. The lower end portion of the highly damped elastic body 44 may be fixed to the body skeleton 18 by means such as adhesion or welding.

  As shown in FIG. 9, in the vibration isolator 40, the cushion body 42 is compressed between the body skeleton 18 and the door 20 in the axial direction when the door 20 is closed. The cushion body 42 has a structure in which the series arrangement portion 54 of the hard high-damping elastic body 44 and the soft low-hung elastic body 46 is arranged in series in the axial direction. Is more elastically deformed than the highly damped elastic body 44. In addition, the parallel arrangement portion 56 that is the outer peripheral portion of the low sag elastic body 46 is fixed to the outer peripheral surface of the high damping elastic body 44, and is thus coaxially arranged with respect to the high damping elastic body 44. .

  In such a state where the vibration isolator 40 is mounted on the vehicle, the body skeleton 18 and the door 20 are elastically connected via the cushion body 42 in a compressed state, so that the door 20 increases the rigidity of the body skeleton 18. It functions as a reinforcing material, and the ride comfort and running performance of the vehicle can be improved by increasing the body rigidity. In particular, since the high damping elastic body 44 and the low sag elastic body 46 are arranged in series and the low sag elastic body 46 having a low dynamic spring characteristic is deformed following the movement of the door 20, The elastic connection state between the door 18 and the door 20 is stably maintained.

  Further, when the door 20 is closed from the opened state, an axially compressive compressive load is input to the cushion body 42 of the vibration isolator 40, but the door 20 is driven by the high damping elastic body 44 of the cushion body 42. Relative to the body skeleton 18 is restrained at an appropriate position, and the kinetic energy of the door 20 is reduced by the damping action by the elastic deformation of the high damping elastic body 44. Therefore, the door 20 is positioned at an appropriate relative position without being hit against the body skeleton 18.

  Moreover, when a large load in the compression direction is input to the vibration isolator 40 when the door 20 is closed, for example, in addition to the series arrangement portion 54 of the elastic body 46 and the highly damped elastic body 44, the vibration is lowered. The parallel arrangement portion 56 of the elastic body 46 is sandwiched between the body skeleton 18 and the door 20 and compressed. Thereby, a harder spring can be obtained in the cushion body 42, and the displacement of the door 20 with respect to the body skeleton 18 is effectively limited. In short, in the vibration isolator 40 of the present embodiment, the spring characteristics of the cushion body 42 are changed stepwise according to the magnitude of the input. When the input is large, the body skeleton 18 and the door A stopper action for restricting the relative displacement of 20 can be obtained more advantageously. As can be seen from FIG. 8, the series arrangement part 54 and the parallel arrangement part 56 are compressed by contacting the door 20 before the parallel arrangement part 56 when the door 20 is closed. Are arranged as follows.

  Further, in the vibration isolator 40 of the present embodiment, the convex portion 58 of the low-sag elastic body 46 enters and is fixed to the recess 52 formed in the high damping elastic body 44. When the cushion body 42 is compressed in the axial direction, the convex portion 58 of the low sag elastic body 46 is compressed while the surface thereof is restrained by the wall portion of the recess 52 of the high damping elastic body 44. As a result, the convex portion 58 of the elastic body 46 is strongly crushed and generates a large strain, and thus the damping action is advantageously exerted on the convex portion 58 so that the door 20 is appropriately attached to the body skeleton 18. The stopper action of stopping at the position is exhibited more advantageously.

  In the vibration isolator 40 according to the present embodiment, it can be confirmed from the result of the simulation in FIG. That is, FIG. 10 shows the distribution of strain when the right half of the longitudinal section of the cushion body 42 is compressed in the axial direction, and is colored according to the magnitude of the strain. Moreover, in FIG. 10, the attaching part 53 is abbreviate | omitted.

  According to the simulation result of FIG. 10, in the state where the cushion body 42 is compressed in the axial direction, strain is mainly generated in the upper portion of the cushion body 42, and the boundary region between the high damping elastic body 44 and the low-sliding elastic body 46. The strain is relatively large. Further, a large distortion is generated in the convex portion 58 of the elastic body 46 that has entered the recess 52 of the highly damped elastic body 44, and the convex portion 58 is more strongly compressed when the cushion body 42 is compressed. confirmed.

  The specific structure of the cushion body provided with such a recess is not particularly limited, and for example, the cushion body 62 of the vibration isolator 60 for the vehicle door shown in FIG. That is, the cushion body 62 is provided with a low-damping elastic body 64 and an elastic body 66 coaxially arranged like the cushion body 32 of the second embodiment, and the high-damping elastic body 64 is lowered. It is arranged on the inner peripheral side of the elastic body 66.

  Furthermore, a groove-like recess 68 that opens to the outer peripheral surface is formed in the high damping elastic body 64 of the cushion body 62, and extends continuously over the entire circumference. Further, the low-hanging elastic body 66 is provided with a projecting portion 70 that enters the recess 68 so as to protrude toward the inner peripheral side, and the projecting portion 70 is fixed to the inner surface of the recess 68.

  As described above, also in the cushion body 62 in which the high damping elastic body 64 and the low sag elastic body 66 are arranged in parallel, the recess 68 opened at the boundary surface between the high damping elastic body 64 and the low sag elastic body 66. In addition, by providing the convex portion 70 that enters the recess 68, when the cushion body 62 is compressed, the damping action by the crushing of the convex portion 70 is effectively exhibited.

  Note that the recess may be formed in a low-profile or elastic body. In that case, the recess is formed so that the convex portion of the high-damping elastic body enters the recess of the low-profile or elastic body. In addition, the specific shape of the recess is not particularly limited, and in addition to the groove shape extending in the circumferential direction exemplified in the above embodiment, the recess shape, the groove shape extending in the axial direction, and the circumferential inclination while tilting in the axial direction. A spiral groove shape extending in the direction may be used. Furthermore, a plurality of sets of recesses and projections can be provided.

  In addition, the opening direction of the recess is desirably substantially orthogonal to the compression direction of the cushion body, but may be a direction that is inclined with respect to the compression direction of the cushion body.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the cushion body does not need to be composed of only a high-damping elastic body and a low-height elastic body, but has intermediate characteristics (loss tangent, compression set, An intermediate elastic body having hardness or the like may be further provided.

  Furthermore, the vibration isolator for the vehicle door is not limited to a structure in which the cushion body is directly bonded to the vehicle door or the body skeleton. For example, the cushion body is a hard mounting member (including bolts and nuts). The cushion body is interposed between the vehicle door and the body skeleton by being fixed and attached to the vehicle door or the body skeleton by means such as mechanical locking or screwing. Anyway. Moreover, you may make it a cushion body attach to a body frame | frame or a door with an attachment member by insert-molding an attachment member to a cushion body. Thus, the vibration isolator is not necessarily limited to the structure consisting of only the cushion body, and may include a member other than the cushion body, such as an attachment member.

  Further, in the above-described embodiment, the example in which the vibration isolator for the vehicle door is attached to the body skeleton, but the vehicle door is attached to the vehicle skeleton and pressed against the body skeleton when the vehicle door is closed. You may do it.

  Moreover, the attachment structure (attachment part 53) to the body frame | skeleton 18 shown in 3rd embodiment is an illustration to the last, Comprising: It can change suitably. Specifically, for example, in the vehicular doorway vibration isolator 80 shown in FIG. 12, a concave groove 82 that opens to the outer peripheral surface and extends in the circumferential direction is formed in the lower portion of the shaft-like portion 48 of the high damping elastic body 44. A plurality of strips are formed in the axial direction, and a lower portion of the shaft-shaped portion 48 having the concave groove 82 is an attachment portion that is fitted to the body skeleton 18.

  Further, the vibration isolator 80 for the vehicle opening / closing door is attached to the vehicle shown in FIG. 12, and the elastic body 46 is in contact with both the body skeleton 18 and the door 20 when the door 20 is closed. In addition, the central portion in the radial direction is a series arrangement portion 54 arranged in series with the high damping elastic body 44 in the compression direction (vertical direction in FIG. 12), and the outer peripheral portion is in parallel with the high damping elastic body 44. It is set as the parallel arrangement | positioning part 56 distribute | arranged automatically. According to the vibration isolator 80 shown in FIG. 12, since the spring characteristics are hard when mounted on the vehicle, the relative displacement of the door 20 with respect to the body skeleton 18 is more effective when the door 20 is closed. This can prevent the vehicle body rigidity and the vibration state from being improved.

  Like the anti-vibration devices 30 and 40 shown in the second and third embodiments and the anti-vibration device 60 shown in FIG. Are arranged in parallel and coaxially at least partially, for example, the cylindrical high-damping elastic bodies 34, 44, 64 surround the outer periphery of the shaft-like low-hanging elastic bodies 36, 46, 66. May be arranged.

  Further, in the structure in which the high damping elastic body and the low sag elastic body are arranged in parallel and coaxially, as shown in the third embodiment, the lower end surface of the low sag elastic body is below the high damping elastic body. The lower end surface of the elastic body may be located lower than the lower end surface of the high damping elastic body, and the lower end surface of the lower elastic body is the body skeleton. The lower end surface of the high damping elastic body may be separated from the body skeleton. In addition, the distal end surface of the high damping elastic body and the distal end surface of the elastic body need not be located on the same plane as in the second embodiment. By projecting from the tip surface of the highly damped elastic body, it is possible to reduce the shock feeling at the initial contact.

  In addition, the vehicle opening / closing door is not necessarily limited to a side door of an automobile, and includes, for example, an engine hood (bonnet), a trunk lid, a back door (back hatch), and the like. Furthermore, the vibration isolator for a vehicle opening / closing door is not only applied to an automobile opening / closing door, but can also be suitably applied to an opening / closing door for a vehicle other than an automobile such as a railway vehicle.

10, 30, 40, 60, 80: Vibration isolator for vehicle door, 12, 32, 42, 62: Cushion body, 14, 34, 44, 64: High damping elastic body, 16, 36, 46, 66 : Low elastic body, 18: body skeleton, 20: door (vehicle open / close door), 52, 68: recess, 54: serial arrangement part, 56: parallel arrangement part, 58, 70: convex part

Claims (10)

A vibration isolator for a vehicle opening / closing door provided with a cushion body that is attached to either the vehicle opening / closing door or the vehicle body skeleton and disposed between the vehicle opening / closing door and the body skeleton. ,
In a state where the vehicle door is closed, the cushion body is in a compressed state between the vehicle door and the body skeleton,
The cushion body includes a high damping elastic body and a low sag elastic body, the loss tangent (tan δ) of the high damping elastic body is 0.3 or more, and the compression set of the low sag elastic body However, when compressed for 70 hours under a temperature condition of 85 ° C., it is 25% or less, and the highly damped elastic body is harder than the low elastic body. Vibration isolator for vehicle doors.   2. The vehicle door according to claim 1, wherein the high damping elastic body and the low sag elastic body are arranged in series in a compression direction of the cushion body in a state in which the vehicle door is closed. Anti-vibration device.   The vibration isolator for a vehicle opening / closing door according to claim 2, wherein the high damping elastic body constitutes a base end portion of the cushion body attached to either the vehicle opening / closing door or the body skeleton.   The high damping elastic body and the low sag elastic body are arranged in parallel with respect to the compression direction of the cushion body in a state where the vehicle door is closed. The vibration isolator of the opening / closing door for vehicles as described.   The vibration isolator for a vehicle opening / closing door according to claim 4, wherein the high damping elastic body and the low sag elastic body are arranged coaxially.   The vibration isolator for a vehicle opening / closing door according to claim 5, wherein the high damping elastic body is disposed on an inner peripheral side of the low sag elastic body.   A recess is formed in a boundary surface between one of the high damping elastic body and the low sag elastic body, and one of the high damping elastic body and the low sag elastic body enters the recess. The vibration isolator for a vehicle opening / closing door according to any one of claims 1 to 6.   The vibration isolator for a vehicle opening / closing door according to any one of claims 1 to 7, wherein the high-damping elastic body is styrene rubber or butyl rubber.   The vibration isolator for a vehicle opening / closing door according to any one of claims 1 to 8, wherein the low sag elastic body is natural rubber or butadiene rubber.   The low sag elastic body includes a series arrangement portion arranged in series on a distal end side of the high damping elastic body and a parallel arrangement portion arranged in parallel with the high damping elastic body. The vibration isolator of the vehicle door as described in any one of 1-9.