JP5314467B2 - Back door damper - Google Patents

Description

  The present invention relates to a back door damper, and relates to a back door damper that can be easily attached to a back door of a vehicle.

  When a vehicle such as an automobile travels, various noises are generated inside and outside the vehicle interior, and so-called low-frequency booming noise is known as one of such noises that gives a passenger a feeling of pressure or discomfort. This low-frequency booming noise is generated when the tire and suspension component system resonates due to input from the road surface, and the amplified vibration is transmitted to the vehicle interior via the vehicle body panel. The resonance in the acoustic system (the interior space of the vehicle acts as a resonance space) and the resonance of the structural system such as the door panel are coupled and excited. In order to reduce such low-frequency booming noise, it is known that the resonance frequency of the acoustic system or the resonance frequency of the structural system may be shifted from the natural frequency of the tire and suspension component system. However, the natural frequency of the tire and suspension component system is determined by the characteristics of the tire and suspension, the resonance frequency of the acoustic system is mainly determined by the vehicle interior length and volume, and the resonance frequency of the structural system is Since it is determined by the shape and mass of the door panel, it is difficult to reduce the low-frequency booming noise by shifting the resonance frequency or resonance frequency from the natural frequency. In particular, in a vehicle of a van type or a wagon type automobile that is configured to open and close by a flip-up type or a side-opening type back door, the back door tends to vibrate, which is a major cause of noise. When the door becomes large, the influence of the back door vibration on the vehicle body vibration becomes large, and there is a problem that the ride comfort and the handling stability are also affected.

  Therefore, in a vehicular vehicle such as a van type or a wagon type that is opened and closed with a flip-up type or a side-opening type back door, a dynamic damper (back door damper) is attached to the back door using a bolt member, A technique is disclosed that suppresses the vibration of the back door and suppresses the generation of noise due to the vibration of the back door (Patent Document 1).

  The back door damper includes a bracket member attached to the back door, a mass member as a mass body, and a vibration isolating base that connects the bracket member and the mass member and is made of a rubber-like elastic material. By setting the mass of the mass member and the spring constant of the anti-vibration base in advance so that the resonance frequency (natural frequency) of the vibration system matches the peak frequency of harmful vibration of the back door in question. The harmful vibration of the back door is reduced by the resonance action.

JP 11-291874 A

  By the way, in order to attach the conventional back door damper described above to the back door using a bolt member, first, a bolt is attached to one (reference hole) of a plurality of attachment holes formed in the back door damper. Insert the member, screw this bolt member into the bolt mounting hole formed in the back door and temporarily tighten it, then insert another bolt member into the other mounting hole and screw into the bolt mounting hole After that, final tightening is performed for all bolt members.

  However, in the above-described conventional back door damper, when the bolt member is inserted into the reference hole and screwed into the bolt mounting hole, the back door damper becomes rotatable around the bolt member. Because the positional relationship between the other mounting holes and the other bolt mounting holes of the back door is not fixed, when inserting another bolt member into the other mounting holes, the bolt mounting holes of the back door and the back door damper There is a problem that it is difficult to align the position with the mounting hole, and it is difficult to attach the back door damper to the back door in a short time using a bolt member.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a back door damper that can be easily attached to a back door of a vehicle.

To achieve this object, a back door damper according to claim 1 is attached to a back door of a vehicle, and functions as a mass member, a bracket member attached to the back door, The bracket member and the mass member are connected to each other, and a vibration-proof base made of a rubber-like elastic material is provided. The bracket member includes an attachment plate portion attached to the back door, and the attachment member. A plurality of attachment holes formed in the attachment plate portion; a pair of upright plate portions that rise from the attachment plate portion and are connected to opposite sides of the mass member via the vibration-proof base; An extension portion extending from the peripheral edge of the attachment plate portion in a direction away from one of the attachment holes, and a predetermined portion of the back door formed in the extension portion a securing portion secured to, is formed on the vibration isolating base integrally And a Kutsugae設rubber portion covering the mass member Te, the Kutsugae設rubber portion is formed gradually or stepwise thin moves away from the vibration-isolating base.

  The back door damper according to claim 2 is the back door damper according to claim 1, wherein the extension portion is formed in the same plane as the attachment plate portion, and the locking portion is the extension portion. It is formed by bending the end of the part.

Backdoor damper according to claim 3, wherein, in the back door damper according to claim 1 or 2, wherein the mass member has two inclined projecting laterally from each of the pair of side the vibration-isolating base is connected A bracket and the bracket member connects the side edges of the standing plate portion and faces the connection surface with a predetermined interval therebetween. The covering rubber portion includes a first covering portion that covers the inclined surface of the mass member, and a thinner wall than the first covering portion that covers the connecting surface. A second covering portion and an overlap portion covering the ridge line with the same thickness as the first covering portion and overlapping the second covering portion.

  According to the back door damper of the first aspect, the extending portion extended from the peripheral edge of the mounting plate portion in a direction away from one mounting hole among the plurality of mounting holes, Since it is the structure provided with the latching part formed in the installation part and latched to the predetermined part of the back door, the latching part is latched to the latched part provided in the predetermined part of the back door, By inserting a bolt member into one of the mounting holes (reference hole), screwing this bolt member into the bolt mounting hole formed in the back door, and temporarily tightening it, The back door damper can be temporarily fixed to the back door at two points, that is, the bolt member inserted into the hole and the locking portion, so that it cannot be freely rotated in the horizontal direction. As a result, the positional relationship between the other mounting hole of the back door damper and the other bolt mounting hole of the back door is determined, so another bolt member is inserted into the other mounting hole so that the back door damper is attached to the back door. The screwing operation can be easily performed, and the back door damper can be attached to the back door in a short time.

  In addition, the back door damper is an electric screwdriver in which the operator holds an electric screwdriver in one hand and pushes the back door damper against the back door with the other finger while the flip-up or side-opening back door is open. Since the bolt member is often fastened and attached with a torque such as when the bolt member inserted into the reference hole is temporarily tightened, the back door damper may fall or be suspended in the air during the attachment work. In order to avoid this, it is often fastened with a certain amount of torque. For this reason, if the bolt member inserted into the reference hole is fastened only by pressing the back door damper against the back door with one finger, the friction force between the bolt head of the rotating bolt member and the mounting plate portion The back door damper may rotate, and the positional relationship between the other mounting holes and the bolt mounting holes may shift. Since the bolt member inserted into the reference hole is fastened to a certain degree with a large torque, it is difficult to correct the shifted position and the workability is extremely poor. On the other hand, according to the back door damper of the present invention, the back door damper is temporarily fixed to the back door at two points: the bolt member inserted into the reference hole and the locking portion. Even if the bolt member inserted into the reference hole is fastened by simply pressing the back door damper with a relatively slight force, the back door damper is unlikely to be displaced, and another bolt member is inserted into the other mounting hole. Thus, the operation of screwing the back door damper to the back door can be easily performed, and the back door damper can be attached to the back door in a short time.

In addition, since the play is provided in the size of the to-be-latched part or the latching part, or the outer diameter of the bolt member or the inner diameter of the attachment hole (reference hole), the bolt inserted into the reference hole Even if the back door damper is temporarily fixed to the back door at two points, that is, the member and the locking portion, rattling occurs due to such play and the accuracy is lowered. This decrease in accuracy increases beyond the size of play as the distance from the reference hole increases. On the other hand, according to the back door damper of the present invention, the extended portion extended from the peripheral edge of the mounting plate portion in the direction in which the locking portion is separated from the one mounting hole (reference hole). Since it is the provided structure, the space | interval from a reference hole to a latching | locking part can be taken large. As a result, the amount of displacement between the mounting hole and the bolt mounting hole located far from the reference hole can also be suppressed, and the positioning of the back door bolt mounting hole and the back door damper mounting hole can be performed in a short time. The back door damper can be attached to the back door in a short time.
In addition, since the covering rubber portion that is integrally formed with the vibration isolating base and covers the mass member is formed so as to be gradually or stepwisely thinned away from the vibration isolating base, the mold having the mass member fixed thereto is formed. By forming an injection hole for injecting rubber into the cavity on the vibration-isolating substrate, the required amount of rubber can be reduced as the distance from the vibration-isolating substrate is increased (as the downstream side of the rubber flows). As a result, uneven injection of rubber into the cavity is unlikely to occur, and it is possible to prevent defects in the covering rubber part, improve the yield, reduce the amount of rubber used, and reduce the manufacturing cost. effective.
In addition, since it is provided with a covering rubber portion that is integrally formed with the vibration-proof base made of a rubber-like elastic material and covers the mass member, compared to the case where the entire outer surface of the mass member is exposed, There is an effect that it is possible to suppress the vibration of the mass member itself when the mass member collides with the base plate or the like of the back door due to the vibration. As a result, the vibration of the mass member itself after the collision can be converged at an early stage, so that the mass member and the anti-vibration base can be appropriately displaced to stably exhibit the role as a dynamic damper that reduces harmful vibrations. There is an effect that can be.

  According to the back door damper according to claim 2, in addition to the effect of the back door damper according to claim 1, the extending portion is formed in the same plane as the attachment plate portion, and the locking portion is extended. Since the end portion of the extension portion is bent and formed, the mounting plate portion and the extension portion are formed by pressing, punching, etc., and then the end portion of the extension portion is bent to fix the locking portion. It can be formed and has the effect of excellent productivity.

  Further, according to the back door damper of the present invention, since the engaging portion is formed by bending the extending portion, it is formed on the outer edge of the base plate attached to the back door, or on the back door or the base plate. Since a hole, a groove, or the like can be used as the locked portion, the processing for providing the locked portion on the back door side is minimal, and the processing cost can be reduced.

According to the back door damper of the third aspect , in addition to the effect produced by the back door damper according to the first or second aspect , the mass member protrudes laterally from each of the pair of side surfaces to which the vibration isolation base is connected. Since the two inclined surfaces and the connecting surface that connects the inclined surfaces through the ridge line are provided, the mass member is asymmetric with respect to the line connecting the two anti-vibration substrates, and the vibration-isolating substrate is displaced. By connecting to the mass member in the state, there is an effect that a resonance action for suppressing harmful vibration of the back door can be obtained in a wide frequency band.

  Furthermore, according to the back door damper of the present invention, the bracket member is configured to connect the side edges of the upright plate portions and to have the upright plate portion connecting portion facing the connecting surface with a predetermined interval. Therefore, there is an effect that the rigidity of the bracket member is improved, the mass member and the vibration-proof base are appropriately displaced, and the role as a dynamic damper for reducing harmful vibration can be stably exhibited.

  Furthermore, according to the back door damper of the present invention, the covering rubber part is formed to be thinner than the first covering part covering the connecting surface and the first covering part covering the inclined surface of the mass member. The second covering portion and the overlap portion covering the ridge line with the same thickness as the first covering portion and overlapping the second covering portion, the mass member vibrates. When the connecting surface collides with the upright plate portion connecting portion of the bracket member, the overlap portion is deformed to provide a buffering action, so that the impact can be absorbed and the volume of the hitting sound can be reduced. As a result, there is an effect that an occupant's auditory discomfort can be reduced.

  In addition, since the overlap part covers the ridge line with the same thickness as the first covering part and overlaps the second covering part, the overlap part and the second covering part are vulcanized and molded. The die structure can be simplified to reduce the manufacturing cost and improve the yield.

  Here, instead of the overlap portion, the mass member can also vibrate by providing a protrusion that is thicker than the thickness of the first covering portion and that protrudes from the first covering portion in the vicinity of the ridgeline. And when a connection surface collides with the standing board part connection part of a bracket member, the volume of a striking sound can be made small because a protrusion part deform | transforms and absorbs an impact. However, in the case of providing the ridge portion protruding from the first covering portion, the flow of rubber when forming the covering rubber portion is deteriorated in the cavity portion constituting the ridge portion, and There was a problem that the yield was likely to be reduced because the two covering portions were likely to be defective.

  On the other hand, according to the back door damper of the present invention, the covering rubber portion covers the ridge line between the inclined surface and the facing surface with the same thickness as the first covering portion and overlaps the second covering portion. Since the structure includes the overlapped portion, the rubber flow when forming the covering rubber portion is good, and it is difficult for defects to occur in the overlapping portion and the second covering portion, so that the yield can be improved. .

It is a top view of the back door damper in one embodiment of the present invention. (A) is a front view of a back door damper, (b) is a rear view of a back door damper. It is sectional drawing of the back door damper in the III-III line of FIG. (A) is a bottom view of the bracket member of a back door damper, (b) is sectional drawing of the bracket member in the IV-IV line of Fig.4 (a). It is sectional drawing of the back door damper in the VV line | wire of Fig.2 (a). FIG. 6 is a partial enlarged cross-sectional view of a VI part in FIG. 5.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a back door damper 1 according to an embodiment of the present invention, FIG. 2 (a) is a front view of the back door damper 1, and FIG. 2 (b) is a rear view of the back door damper 1. FIG. 3 is a cross-sectional view of the back door damper 1 taken along line III-III in FIG.

  The back door damper 1 is a dynamic damper that is attached to a vehicle back door (not shown) and suppresses vibration of the back door. The back door damper 1 connects the bracket member 10 attached to the back door, the mass member 20 functioning as a mass body, the bracket member 10 and the mass member 20, and is formed of a rubber-like elastic material. A base 30 is provided.

  The bracket member 10 is formed by pressing, punching, or the like of a metal material. As shown in FIGS. 1 and 2, a mounting plate portion 11 to be attached to the back door and a substantially center of the mounting plate portion 11. And a pair of upright plate portions 13 and 14 facing each other at a predetermined interval from two locations on the inner peripheral edge of the attachment plate portion 11 where the attachment plate opening portion 12 is formed. And.

  As shown in FIGS. 1 and 2, the bracket member 10 according to the present embodiment includes two opposing upright plate portion connecting portions 15 and 16 that connect the side edges of the upright plate portions 13 and 14. The erected plate portions 13 and 14 and the erected plate portion connecting portions 15 and 16 are integrally formed and are erected on the inner peripheral edge of the attachment plate portion 11. Thereby, since the rigidity of the attachment plate part 11 (bracket member 10) can be improved, the thickness of the attachment plate part 11 (bracket member 10) is reduced, thereby reducing the component cost and weight. be able to.

  As shown in FIG. 1, the mounting plate portion 11 of the bracket member 10 in the present embodiment is formed in a horizontally long shape (the horizontal direction in FIG. 1 is longer than the vertical direction in FIG. 1). Four attachment hole forming portions 11a, 11b, 11c, and 11d each having holes 11e, 11f, 11g, and 11h are provided. Further, the attachment plate portion 11 is provided between the attachment hole forming portions 11a and 11c and between the attachment hole forming portions 11b and 11d, and the attachment hole forming portions 11a and 11c and the attachment hole forming portions 11b, 11d is connected with a width (projection width in the left-right direction in FIG. 1) substantially the same width (dimension in the left-right direction in FIG. 1), and is extended in the short direction (vertical direction in FIG. 1) of the mounting plate 11 Directional attachment plate connecting portions 11i and 11j are provided. Further, the attachment plate portion 11 is provided between the attachment hole forming portions 11a and 11b and between the attachment hole forming portions 11c and 11d, and the attachment hole forming portions 11a and 11b and the attachment hole forming portions 11c, Longitudinal attachment that is connected with a narrower width (the vertical dimension in FIG. 1) than the protrusion width 11d (the vertical protrusion width in FIG. 1) and extends in the longitudinal direction (left and right direction in FIG. 1) of the mounting plate 11 Plate portion connecting portions 11k and 11l are provided. Of the mounting holes 11e, 11f, 11g, and 11h, the inner diameter of one mounting hole 11h is smaller than the inner diameters of the other mounting holes 11e, 11f, and 11g. It functions as a reference hole for inserting a bolt member (not shown). Thereby, the play with the inserted bolt member and the attachment hole 11h can be made small, and positioning accuracy can be improved.

  Furthermore, as shown in FIG. 1, the bracket member 10 has a peripheral edge near the attachment hole forming portion 11a of the attachment plate portion connecting portion 11k in the longitudinal direction of the attachment plate portion 11 in a direction away from the attachment hole 11h. The extended portion 17 that is inclined and extended from the end toward the attachment hole forming portion 11a side, and the tip of the extended portion 17 is bent downward (back side in FIG. 1), and the back door is locked. And a locking portion 18 that is locked to a portion (not shown).

  Accordingly, a bolt member (not shown) is inserted into the attachment hole 11h (reference hole) while the locking portion 18 is locked to the locked portion (not shown) of the back door. The back door damper 1 is screwed into a bolt mounting hole formed in the back door and temporarily tightened, so that the back door damper 1 is fixed at two points of the bolt member inserted into the attachment hole 11h (reference hole) and the locking portion 18. Temporarily fixed to the back door and can not rotate freely in the horizontal direction. Therefore, since the positional relationship between the other mounting holes 11e, 11f, 11g of the back door damper 1 and the other bolt mounting holes (not shown) of the back door is determined, the other mounting holes 11e, 11f, 11g The operation | work which inserts another bolt member and screws the back door damper 1 in a back door can be performed easily, and the back door damper 1 can be attached to a back door in a short time.

  Furthermore, since the extending part 17 extended from the peripheral edge of the attaching plate part 11 is provided in the direction away from the attaching part 11h (reference hole), the attaching hole 11h is provided. To the locking portion 18 can be increased. As a result, the amount of displacement between the mounting hole 11e located diagonally away from the mounting hole 11h and the bolt mounting hole of the back door can be suppressed, and the mounting of the back door bolt mounting hole and the back door damper 1 can be suppressed. Positioning with the attachment holes 11e, 11f, and 11g can be easily performed in a short time, and the back door damper 1 can be attached to the back door in a short time.

  Further, according to the back door damper 1 of the present invention, the peripheral edge of the longitudinal attachment plate connecting portion 11k formed narrower than the protruding width (the vertical dimension in FIG. 1) of the attachment hole forming portions 11a and 11b. The extending portion 17 is extended from the extending portion 17, and the extending portion 17 further extends closer to the attachment hole forming portion 11a in which the attachment hole 11e is formed at the diagonal position of the attachment hole 11h (reference hole). Therefore, the distance from the attachment hole 11h to the locking portion 18 can be increased, and the inside of the virtual rectangle formed by connecting the outer edges of the attachment hole forming portions 11a, 11b, 11c, and 11d can be extended. By positioning the tip of the installation portion 17, the extension portion 17 can be prevented from overhanging, and the component size (occupied area) of the back door damper 1 can be reduced.

  The mass member 20 is made of a metal material such as cast iron. As shown in FIGS. 1 and 3, the first connection base 30a and the second connection base 30b (vibration isolation base 50) are respectively provided on the opposite side surfaces 20a and 20b. The mass member 20 is elastically supported by the pair of upright plate portions 13 and 14 of the bracket member 10 through these vibration isolation bases 30. In the present embodiment, as shown in FIGS. 1 and 3, the mass member 20 has a substantially hexagonal shape protruding from one of the side surfaces 20 a and 20 b to one side (the lower side in FIG. 1) when viewed from above. It is comprised in the shape of substantially rectangular shape by side view. The vibration isolating base 30 (the first connecting base 30a and the second connecting base 30b) is vulcanized and bonded between the side surfaces 20a and 20b of the mass member 20 and the standing plate portions 13 and 14 of the bracket member 10, respectively. ing.

  Thus, a line connecting the first connection base 30a and the second connection base 30b (in a top view, a straight line connecting the center in the width direction of the first connection base 30a and the center in the width direction of the second connection base 30b). In FIG. 1, the mass member 20 is asymmetrical with respect to the line III-III, and the anti-vibration base 30 is connected to the mass member 20 in a misaligned state. A resonance action for suppressing vibration can be obtained in a wide frequency band.

  Further, as shown in FIGS. 1 and 3, the mass member 20 includes a covering rubber portion 31 that is formed integrally with the vibration-proof base 30 and is covered with a rubber-like elastic material. This suppresses the vibration of the mass member 20 itself when the mass member 20 collides with the upright plate connecting portions 15 and 16 of the bracket member 10 or the base plate (not shown) of the back door due to the vibration of the vehicle. Can do. As a result, the vibration of the mass member 20 itself after the collision can be converged at an early stage, so that the mass member 20 and the vibration isolating base 30 can be appropriately displaced to stably serve as a dynamic damper that reduces harmful vibrations. It can be demonstrated.

  Next, a detailed configuration of the bracket member 10 of the back door damper 1 will be described with reference to FIG. 4A is a bottom view of the bracket member 10 of the back door damper 1, and FIG. 4B is a cross-sectional view of the bracket member 10 taken along line IV-IV in FIG. 4A.

  As shown in FIG. 4, the attachment plate portion 11 of the bracket member 10 of the back door damper 1 is formed into a plate shape by pressing, punching, or the like of a metal material, and the extending portion 17 is formed by the attachment plate portion 11. Are formed in the same plane. Further, the locking portion 18 is formed by bending the end portion of the extending portion 17 to the bottom surface side of the bracket member 10 (the front side in FIG. 4A).

  Thereby, after shaping | molding the attachment board part 11 and the extension part 17 by a press, punching, etc., the edge part of the extension part 17 can be bent and the latching | locking part 18 can be formed, and it is excellent in productivity.

  Next, detailed configurations of the mass member 20 and the covering rubber portion 31 will be described with reference to FIGS. 5 and 6. 5 is a cross-sectional view of the back door damper 1 taken along the line V-V in FIG. 2A, and FIG. 6 is a partial enlarged cross-sectional view of a portion VI in FIG.

  As shown in FIG. 5, the mass member 20 includes two inclined surfaces 20 c and 20 d that protrude laterally (lower side in FIG. 5) from each of the pair of side surfaces 20 a and 20 b to which the vibration isolation base 30 is coupled, The surface 20c and the inclined surface 20d are formed in a deformed substantially hexagonal column shape having a connecting surface 20e that connects the respective ridgelines 20f and 20g.

  Accordingly, the center of gravity of the mass member 20 can be moved to the side where the inclined surfaces 20c and 20d and the connecting surface 20e are formed and protruded, and as described above, the mass member 20 with the vibration-proof base 30 being displaced. By connecting to, a resonance action for suppressing harmful vibration of the back door can be obtained in a wide frequency band.

  Here, the upright plate portion connecting portion 16 of the bracket member 10 connects the side edges of the upright plate portions 13 and 14 with a predetermined distance from the inclined surfaces 20c and 20d and the connecting surface 20e of the mass member 20. Facing each other.

  Further, the covering rubber part 31 has first covering parts 31a and 31b that cover the inclined surfaces 20c and 20d of the mass member 20, respectively, and a connecting surface 20e that is thinner than the first covering parts 31a and 31b. As shown in FIG. 5 or FIG. 6, the second covering portion 31 c formed on the ridge lines 20 f and 20 g are covered with the same thickness as the first covering portions 31 a and 31 b to form the second covering portion 31 c. Overlapped portions 31d and 31e are provided. That is, the position where the second covering portion 31c is further away from the vibration isolating substrate 30 (the first connecting substrate 30a or the second connecting substrate 30b) than the first covering portion 31a (or 31b) of the covering rubber portion 31. Since the thickness of the second covering portion 31c is thinner than that of the first covering portion 31a (or 31b), the covering rubber portion 31 is provided with the vibration isolating base 30 (first connecting base 30a). Or it is the structure formed thinly in steps as it left | separated from the 2nd connection base | substrate 30b).

  Thus, when the back door damper 1 is manufactured, an injection hole for injecting rubber into the cavity of the mold to which the mass member 20 is fixed is formed on the vibration isolating base 30 to reduce the necessary amount of rubber. As the distance from the base 30 increases, the amount can be reduced (as the downstream side of the rubber flow direction). As a result, uneven injection of rubber into the cavity is unlikely to occur, and it is possible to prevent defects in the covering rubber portion 31, thereby improving the yield, reducing the amount of rubber used, and reducing the manufacturing cost. .

  Further, the covering rubber part 31 covers the ridgelines 20f and 20g with the same thickness as the first covering parts 31a and 31b, and overlaps a part of the second covering part 31c. , 31e are provided over the entire length of the ridgelines 20f, 20g.

  Thereby, when the mass member 20 vibrates and the connecting surface 20e collides with the standing plate portion connecting portion 16 of the bracket member 10, the mass member 20 protrudes from the second covering portion 31c to the standing plate portion connecting portion 16 side. The overlapping portions 31d and 31e are deformed to absorb the impact and reduce the volume of the hitting sound. As a result, occupant hearing discomfort can be reduced.

  Further, as shown in FIG. 5, the standing plate portion connecting portion 16 is opposed to each of the inclined surfaces 20 c and 20 d and the connecting surface 20 e of the mass member 20 with substantially the same interval, and this interval The bent portions 16 a and 16 b of the standing plate connecting portion 16 are opposed to the ridge lines 20 f and 20 g of the mass member 20 with the same interval. Further, the bent portions 16a and 16b of the upright plate connecting portion 16 are parallel to the side surfaces 20a and 20b of the mass member 20 from the ridge lines 20f and 20g of the mass member 20 (in a top view, a pair of vibration isolations). The substrate 30 is arranged in a line connecting the centers in the width direction (a direction orthogonal to the line III-III in FIG. 1). As a result, when the mass member 20 and the vibration isolation base 30 are vibrated greatly, the overlap portions 31d and 31e formed on the ridge lines 20f and 20g collide with the bent portions 16a and 16b of the standing plate connecting portion 16, respectively. Thereby, since the contact area of the overlap parts 31d and 31e which collide with the bending parts 16a and 16b of the standing-up board part connection part 16 and can displace can be narrowed, the buffering effect of the overlap parts 31d and 31e can be reduced. This can be increased to reduce the volume of the hitting sound.

  The overlapping portions 31d and 31e cover the ridge lines 20f and 20g with the same thickness as the first covering portions 31a and 31b and overlap a part of the second covering portion 31c. The die structure for vulcanizing and molding the portions 31d and 31e and the second covering portion 31c can be simplified to reduce the manufacturing cost and improve the yield. Further, since the overlap portions 31d and 31e are overlapped with a part of the second covering portion 31c (a plane portion of the connecting surface 20e) beyond the ridge lines 20f and 20g, the overlap portions 31d and 31e Adhesive strength with the two covering portions 31c can be increased, and durability can be improved.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, the numerical values (for example, the number and size of each component) given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  Moreover, in the said embodiment, the attachment board part 11 of the bracket member 10 is a narrow longitudinal direction attachment board part connection part 11k, 11l which connects the attachment hole formation part 11a, 11b, 11c, 11d, Although the description has been given of the case where the mounting holes forming portions 11a, 11b, 11c, and 11d are provided with the short-direction mounting plate portion connecting portions 11i and 11j that connect the same width, the present invention is not necessarily limited thereto. For example, you may comprise so that the width | variety (dimension in the left-right direction of FIG. 1) of short direction attachment plate part connection part 11i, 11j may also be narrowed. Moreover, it does not have both the longitudinal direction attachment board part connection part 11k, 11l which connects the attachment hole formation part 11a, 11b, 11c, 11d, and the short direction attachment board part connection part 11i, 11j, or which It is also possible to have a configuration having only one of them. As a result, the component size of the back door damper 1 can be reduced and the space for fixing the back door (occupied area in the back door) can be made compact. In addition, when not having both the longitudinal direction attachment plate part connection parts 11k and 11l and the short direction attachment plate part connection parts 11i and 11j, the extension part 17 is the attachment hole forming part of the attachment plate part 11. It is configured to extend from the peripheral edge of 11a. Moreover, when it has any one of the longitudinal direction attachment plate part connection parts 11k and 11l and the short direction attachment plate part connection parts 11i and 11j, the extending part 17 is connected to the longitudinal direction attachment plate part. It extends from the peripheral edge of one of the portions 11k and 11l and the short direction attachment plate portion connecting portions 11i and 11j or the peripheral edge of the attachment hole forming portion 11a. In the above embodiment, the extending portion 17 may be provided at the peripheral edge of the attachment hole forming portion 11 a of the attachment plate portion 11.

  Moreover, in the said embodiment, although the case where the bracket member 10 was provided with the standing board part connection parts 15 and 16 which connect the side edges of the standing board part 11 was demonstrated, it is not necessarily restricted to this. For example, although a pair of upright plate portions 13 and 14 facing two locations on the inner peripheral edge of the attachment plate portion 11 in which the attachment plate opening 12 is formed are provided, the upright plate portion connecting portions 15 and 16 are provided. It is good also as a structure which abbreviate | omits formation. Moreover, it replaces with the standing board part connection parts 15 and 16 which connect the side edges of the standing board parts 13 and 14, and connects the upper edges of the standing board parts 13 and 14 and the upper surface of the mass member 20 ( You may provide the standing-up board part connection part which opposes FIG. 2 (a) upper side and FIG.2 (b) upper side) at predetermined intervals.

  Moreover, in the said embodiment, the mass member 20 was comprised in the substantially hexagonal shape which protruded from the side of each side to the one side of the side in the top view, and the substantially rectangular shape in the side view. Although the case has been described, it is not limited to this shape, and may be a substantially rectangular parallelepiped shape.

  Moreover, in the said embodiment, although the latching | locking part 18 bent the extending part 17 and was made to protrude from the same surface of the attachment board part 11, it was not necessarily restricted to this. Depending on the state of the locked portion provided in the back door, it is possible to appropriately set the shape to be lockable. For example, if the locked portion is protruding, the locking portion can be a recess, a hole, a notch or the like that can be engaged therewith.

  In addition, the case where the covering rubber portion 31 is formed to be thin in stages as it is away from the vibration isolation base 30 has been described, but is not necessarily limited thereto, and by changing the shape of the cavity of the mold, You may comprise so that the covering rubber part 31 may become thin gradually as it leaves | separates from the vibration proof base 30. FIG. Even with this configuration, by forming the vibration isolating base 30 near the injection hole of the mold, the amount of rubber necessary for forming the covering rubber portion 31 can be reduced as the distance from the vibration isolating base 30 increases. Further, uneven injection of rubber into the cavity hardly occurs, and it is possible to prevent the covering rubber portion 31 from being defective and to improve the yield.

  Moreover, in the said embodiment, as shown in FIG. 5, the bending parts 16a and 16b of the standing board part connection part 16 are from the ridgelines 20f and 20g of the mass member 20, with respect to the side surfaces 20a and 20b of the mass member 20. However, the overlap portions 31d and 31e formed on the ridge lines 20f and 20g collide with the bent portions 16a and 16b of the standing plate connecting portion 16 respectively. It is not limited to this. For example, the inclined surfaces 20c and 20d of the mass member 20 are shortened, the connecting surface 20e is formed long, and the positions of the ridge lines 20f and 20g are arranged closer to the side surfaces 20a and 20b. You may comprise so that it may each collide with the inclined surface (surface between the standing board parts 13 and 14 and bending part 16a, 16b) of the board part connection part 16. FIG. Also with this configuration, the contact area of the overlap portions 31d and 31e that collide with the upright plate portion connecting portion 16 and be displaced can be reduced. The volume of the sound can be reduced.

  Further, the inclined surfaces 20c, 20d of the mass member 20 are long, the connecting surface 20e is short, the positions of the ridgelines 20f, 20g are separated from the side surfaces 20a, 20b, and the overlap portions 31d, 31e are You may comprise so that it may collide with the front (surface between bending part 16a, 16b) of the part connection part 16. FIG. In this case, the overlap portions 31d and 31e collide with the upright plate portion connecting portion 16 from the direction orthogonal to the front surface of the upright plate portion connecting portion 16 (the surface between the bent portions 16a and 16b) and are compressed. Therefore, the overlap portions 31d and 31e are not easily deformed in the twist direction, and are excellent in durability.

DESCRIPTION OF SYMBOLS 1 Back door damper 10 Bracket member 11 Attachment board part 13,14 Standing board part 15,16 Standing board part connection part 11e, 11f, 11g, 11h Attachment hole 17 Extension part 18 Locking part 20 Mass member 20c , 20d Inclined surface 20e Connecting surface 20f, 20g Ridge line 30 Anti-vibration base 31 Covering rubber part 31a, 31b First covering part 31c Second covering part 31d, 31e Overlap part

Claims (3)

A back door damper attached to a back door of a vehicle, a mass member functioning as a mass body, a bracket member attached to the back door, and connecting the bracket member and the mass member together with a rubber shape In a back door damper comprising a vibration isolating base made of an elastic material,
The bracket member includes an attachment plate portion attached to the back door, a plurality of attachment holes formed in the attachment plate portion, and rises from the attachment plate portion via the vibration-proof base. A pair of upright plate portions connected to opposite sides of the mass member, and extending from the peripheral edge of the attachment plate portion in a direction away from one attachment hole of the plurality of attachment holes. An extended portion provided, and a locking portion formed in the extended portion and locked to a predetermined location of the back door ,
A covering rubber part that is integrally formed with the vibration-proof base and covers the mass member;
The back door damper is characterized in that the covering rubber portion is formed to be thin gradually or stepwise as it is separated from the vibration-proof base .   The extension portion is formed in the same plane as the attachment plate portion, and the locking portion is formed by bending an end portion of the extension portion. The back door damper according to 1. The mass member includes two inclined surfaces protruding laterally from each of a pair of side surfaces to which the vibration isolation base is connected, and a connecting surface that connects the inclined surfaces with each other via a ridgeline,
The bracket member includes a standing plate portion coupling portion that couples the side edges of the standing plate portion and faces the coupling surface with a predetermined interval therebetween,
The covering rubber portion includes a first covering portion that covers the inclined surface of the mass member, and a second covering portion that covers the connecting surface and is thinner than the first covering portion. , according to claim 1 or 2, characterized in that it comprises a overlap portion where the ridge was overlap Kutsugae設and the second covering portion at the same thickness as the first covering portion Back door damper.

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