JP2023048878A - Vehicular side door structure - Google Patents

Abstract

To provide a vehicular side door structure that can reduce vibrations of the whole of an outer panel, while suppressing cost increase.SOLUTION: A vehicular side door structure 20 comprises: a door panel 24 that has an outer panel 26 forming an outer surface of a door 22 of a vehicle 10 and an inner panel 28 arranged on a vehicle interior side of the outer panel 26; and a door hinge 32 which supports the door panel 24 turnably with respect to a main body 12 of a vehicle body. The door hinge 32 comprises vehicle body-side fixed parts 32 that are fixed to the main body of the vehicle body and door-side fixed parts 35 that can turn with respect to the vehicle body-side fixed parts 32 through hinge shafts 34 and are fixed to the door panel 24. The vehicular door structure 20 further comprises attenuating means 50, mounted on the door-side fixed parts 35, which can attenuate vibration energy transmitted to the door-side fixed parts 35.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle door structure applied to vehicles such as automobiles.

2. Description of the Related Art When a vehicle such as an automobile is running, road noise is generated due to friction between a road surface and tires, and driving system noise such as acceleration noise originating from a power train such as an engine is generated. These noises are perceived by the occupants as vibrations propagate from the suspension to the body and then resonate the air in the cabin.

One of the transmission mechanisms of vibration is transmission from the frame member of the vehicle body to the outer panel of the door of the vehicle. For example, a door hinge is attached to the side of the side door of a vehicle to rotatably support the side door. It is transmitted to the outer panel of the side door.

In general, the outer panel of a vehicle door is made of a thin plate, and when vibration is transmitted from the door hinge, the outer panel vibrates and emits radiation sound. If this radiated sound propagates into the vehicle interior as noise, the comfort of the vehicle interior will be impaired, so there is a demand for a door structure that reduces noise caused by vibration of the outer panel.

As a door structure for suppressing noise, a structure that reinforces the outer panel itself of the door is known. For example, Patent Literature 1 discloses a door structure in which a plurality of reinforcements, which are stiffening members, are joined to the inner surface of an outer panel of a side door of a vehicle. Each reinforcement extends across both ends of the outer panel in the width direction, and is joined to the vehicle interior surface of the outer panel with a spot-like mastic adhesive applied to the reinforcement. In this door structure, reinforcement increases the tensional rigidity of the outer panel, and elastic mastic adhesive dampens vibrations, thereby reducing vibrations of the outer panel and suppressing noise generation.

Further, as another door structure for suppressing noise, there is known one in which a resonator, which is a sound absorbing device, is provided inside the door. For example, Patent Literature 2 describes a door structure in which a resonator is arranged between an inner panel of the door and a door trim interior material arranged inside the inner panel of the door in a side door of a vehicle. In this door structure, a sound absorption effect can be obtained by converting the energy of radiated sound generated by the vibration of the outer panel into frictional energy with the resonator.

JP 2020-111235 A JP 2006-142885 A

However, the door structure described in Patent Document 1 has a problem that it is difficult to suppress the vibration of the entire outer panel because the layout of the interior space of the door limits the places where the reinforcement can be arranged.

On the other hand, in the case where the resonator is installed inside the door, even if the outer panel vibrates, the radiated sound generated by the vibration can be absorbed by the resonator. However, since it is necessary to provide a special sound absorbing structure inside the door, there is a problem that the manufacturing process and cost increase.

An object of the present invention is to provide a vehicle door structure capable of reducing vibration of the entire outer panel while suppressing an increase in cost.

In order to achieve the above object, one embodiment of the present invention provides a door panel having an outer panel forming an outer surface of a door of a vehicle and an inner panel disposed inside the outer panel, and a vehicle body fixed to a vehicle body. and a door side fixing portion that is rotatable with respect to the vehicle body side fixing portion via a hinge shaft and fixed to the door panel, and rotates the door panel with respect to the vehicle body. a movably supported door hinge, further comprising damping means attached to the door-side fixing portion and capable of damping vibration energy transmitted to the door-side fixing portion. do.

In one embodiment of the present invention, in the vehicle door structure, the door-side fixing portion is formed in a tubular shape and is fixed to the inner panel in a state in which the hinge shaft penetrates in the radial direction, The damping means is mounted inside the cylindrical door-side fixing portion.

In one embodiment of the present invention, in the vehicle door structure, the damping means is disposed inside the door panel and attached to the door side fixing portion by a fixture for fixing the door side fixing portion to the door panel. characterized by being installed

Further, in one embodiment of the present invention, in the vehicle door structure, the damping means is disposed between the door-side fixing portion and the door panel, and a fixture for fixing the door-side fixing portion to the door panel. is attached to the door-side fixing portion by

Moreover, one embodiment of the present invention is characterized in that, in the vehicle door structure, the damping means is a rubber member, a liquid-sealing mount, or a damper.

According to the vehicle door structure of the present invention, vibration of the entire outer panel can be reduced while suppressing an increase in cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows some vehicles to which the door structure which concerns on the 1st Embodiment of this invention is applied. It is a schematic explanatory drawing of door structure. It is a perspective view which shows the attachment state of a door hinge and a door panel. It is explanatory drawing which shows the attachment state of a door hinge and a door panel. Figure 4 is a perspective view similar to Figure 3 showing a second embodiment of the door structure; It is explanatory drawing which shows the attachment state of a door hinge and a door panel. FIG. 5 is an illustration similar to FIG. 4 showing a third embodiment of the door structure;

(First embodiment)
FIG. 1 is a side view showing part of a vehicle 10 to which a vehicle door structure 20 according to a first embodiment of the invention is applied. The vehicle door structure 20 can be used for a front side door 22, a rear side door, and a back door provided on the vehicle side. In this embodiment, an example of application to the front side door 22 is shown, and FIG. 1 omits illustration of the rear side door of the vehicle 10 and shows the opening 16 for the rear side door. In the vehicle body 12, a front pillar 13 and a center pillar 14, which are frame members, are arranged on the vehicle front side and the vehicle rear side of the front side door 22, respectively. In the following description, the front side door 22 is also simply referred to as "door 22".

A vehicle 10 such as an automobile generates road noise and drive system noise during running. These noises are perceived as noise when vibration originating from the tires 18 and the engine (not shown) propagates from the suspension, propeller shaft, etc. to the vehicle body 12 and causes the air in the cabin to resonate.

As a method for finding the propagation path of vibration, a technique using vibration intensity (Structural Intensity) is known in recent years. Vibration intensity is defined as "vibration energy transmitted per range width of a structure per unit time", and is used to visualize the propagation path of vibration energy in a structure by indicating the direction and magnitude of the vibration energy as a vector. is an indicator. In the door structure 20, vibration energy obtained using vibration intensity technology propagates through a propagation path, specifically, from the vehicle body 12 through the door hinges 30A and 30B of the door 22 to the outer panel 26 of the door 22. It is a structure capable of suppressing the vibration of the outer panel 26 by paying attention to the propagation path of the vibration.

FIG. 2 is a schematic illustration of the door structure 20, showing a state in which the outer panel 26 of the door 22 is removed. The door structure 20 of this embodiment includes a door panel 24, a pair of upper and lower door hinges 30A and 30B that rotatably support the door panel 24 with respect to the vehicle body 12, damping means 50 attached to each of the door hinges 30A and 30B, Prepare. Each configuration will be described in detail below.

The door panel 24 has an outer panel 26 that forms the outer surface of the door 22 and an inner panel 28 that is arranged inside the outer panel 26, as shown in FIGS. As shown in FIG. 2, the inner panel 28 has a rectangular body portion 28a and a flange portion formed on the periphery of the body portion 28a when viewed from the side of the vehicle with the door 22 closed. The flange portion is a portion projecting outward in the vehicle width direction from the main body portion 28a. A rear flange portion 28c extending in the vertical direction, and a lower flange portion 28d extending in the front-rear direction and formed on a side portion on the lower side of the vehicle.

A pair of door hinges 30A and 30B are attached to the side portion of the door panel 24 on the front side of the vehicle body. FIG. 3 is a perspective view showing how the door hinge 30A and the door panel 24 are attached. Each door hinge 30A, 30B includes a vehicle body side fixed portion 32 fixed to the vehicle body 12, a hinge shaft 34 supported by the vehicle body side fixed portion 32, and a door side fixed portion 35 fixed to the door panel 24. The door side fixed portion 35 is configured to be rotatable with respect to the vehicle body side fixed portion 32 via the hinge shaft 34 . Since each door hinge 30A, 30B has a similar configuration and a similar mounting structure to the door panel 24, the following description will focus on the upper door hinge 30A.

The vehicle body side fixing portion 32 of the door hinge 30A is made of a metal material and has a plate-like base portion 32a and a pair of pivot portions 32b and 32c projecting from the base portion 32a. The base 32 is fixed to the vehicle body 12 using fasteners 33 such as bolts. The pair of shaft support portions 32b and 32c are portions projecting outward in the vehicle width direction from the vehicle upper side and the vehicle lower side of the base portion 32a, respectively, and support both end portions of a hinge shaft 34 extending in the vehicle vertical direction.

The door-side fixing portion 35 is made of a metal material having higher rigidity than the door panel 24, such as steel. The door-side fixing portion 35 of this embodiment is formed in a tubular shape. Although the cross section of the door-side fixing portion 35 in the illustrated example is formed in a rectangular shape, the cross-sectional shape is not limited to this, and may be other polygonal, circular, elliptical, or the like. The door-side fixing portion 35 is fixed to the front flange portion 28b of the inner panel 28 using a fixture 56 with the hinge shaft 34 penetrating in the radial direction. In this embodiment, as shown in FIGS. 3 and 4, the front flange portion 28b of the inner panel 28 is formed with a pair of bent pieces 29 formed by bending a portion of the flange portion 28b toward the hinge shaft 34 side. The pair of bent pieces 29 are in contact with the peripheral wall surface of the door-side fixing portion 35, and each bent piece 29 is fixed to the inner panel 28 using fasteners 56 such as bolts. By fixing the door-side fixing portion 35 to the door panel 24 in this manner, the door panel 24 is configured to be rotatable about the hinge shaft 34 together with the door-side fixing portion 35 .

The damping means 50 is capable of damping vibration energy by elastic deformation or the like, and is attached to the door-side fixing portion 35 of each of the door hinges 30A and 30B to damp the vibration energy transmitted to the door-side fixing portion 35. In this embodiment, it is mounted inside the tubular door-side fixing portion 35 .

As the damping means 50, for example, one of an elastic rubber member, a liquid seal mount that absorbs vibration by displacing the viscous fluid in the liquid chamber, and a damper can be used. Alternatively, the damping means 50 may be configured by combining these. By using an existing rubber member, liquid-sealed mount, or damper as the damping means 50, it is possible to damp vibration energy with an inexpensive structure. In this embodiment, a rubber member 54 is used as the damping means 50, and dots are attached to the rubber member 54 in each drawing so that the arrangement position can be easily understood. In the illustrated example, the rubber member 54 is attached to the inner side of the door panel rather than the fixture 56, but this is not restrictive, and the damping means 50 is located inside the door-side fixing portion 35 formed in a cylindrical body. , can be mounted within a range that does not hinder the rotational movement of the door-side fixing portion 35 .

In the door structure 20 described above, when the vehicle 10 is running, the vibration energy transmitted from the front pillar 13 of the vehicle body 12 to the door-side fixing portion 35 via the vehicle-body-side fixing portions 32 and the hinge shafts 34 of the door hinges 30A and 30B is absorbed. It can be damped by the damping means 50 attached to the door-side fixing portion 35 . That is, the elastic deformation of the damping means 50 attenuates the vibrational energy, and the vibrational energy transmitted from the door hinges 30A and 30B to the outer panel 26 of the door 22 can be reduced. As a result, it is possible to effectively suppress the vibration of the entire outer panel 26 without using an expensive sound absorbing device, and as a result, it is possible to prevent noise from being generated in the cabin.

In this embodiment, the vibrational energy transmitted from the vehicle body 12 to the door hinges 30A and 30B is transmitted from the hinge shaft 34 to the door-side fixing portion 35 formed in a cylindrical shape, but is damped inside the cylindrical body. A means 50 is mounted in which the vibrational energy is damped. Vibrational energy transmitted from the vehicle body 12 to the door 22 takes the main route through the door-side fixing portion 35 with high rigidity, and is less likely to flow through the inner panel 28 with lower rigidity than this. Vibrational energy can be efficiently damped in the damping means 50 . Further, since the door-side fixing portion 35 is fixed to the inner panel 28 of the door 22 and the vibration energy is not directly transmitted from the door-side fixing portion 35 to the outer panel 28, the effect of suppressing the vibration of the outer panel 26 is suppressed. can be improved.

(Second embodiment)
FIG. 5 is a perspective view similar to FIG. 3 showing a second embodiment of the door structure 20, and FIG. 6 shows how the door hinges 30A, 30B and the door panel 24 are attached to the door structure 20 shown in FIG. It is an explanatory diagram. In 2nd Embodiment, the same code|symbol is attached|subjected to the structure similar to 1st Embodiment. The door structure 20 of the second embodiment differs from that of the first embodiment in the structure of the door-side fixing portions 36 of the door hinges 30A and 30B and the mounting structure of the damping means 50 to the door-side fixing portions 36 . Since other configurations and structures are the same as those of the first embodiment, details thereof will be omitted in the following description.

In this embodiment, the door hinges 30A and 30B are each composed of a vehicle body side fixed portion 32 fixed to the vehicle body 12, a hinge shaft 34 supported by the vehicle body side fixed portion 32, and a door side fixed portion fixed to the door panel 24. a portion 36; Since each door hinge 30A, 30B has a similar configuration and a similar mounting structure to the door panel 24, the following description will focus on the upper door hinge 30A.

The vehicle body side fixing portion 32 and the hinge shaft 34 of the door hinge 30A have the same structures as those of the first embodiment. A door-side fixing portion 36 of the door hinge 30A is connected to the hinge shaft 34 so as to be rotatable about the hinge shaft 34 . The door-side fixing portion 36 is made of a metal material having higher rigidity than the door panel 24, and includes a pair of door-side base portions 36a and 36b fixed to the inner panel 28 and a pair of support portions protruding from the respective door-side base portions 36a and 36b. It has portions 36c and 36d and a connecting portion 36e. The pair of support portions 36c and 36d are formed in a plate shape projecting substantially perpendicularly from the opposing side portions of the pair of door-side base portions 36a and 36b. connecting the parts. The door-side base portions 36a and 36b are fixed to the front flange portion 28b of the inner panel 28 using fasteners 58 such as bolts and nuts. The pair of support portions 36c and 36d each have an insertion hole through which the hinge shaft 34 is inserted. In this state, the hinge shaft 34 is inserted through the insertion hole.

The damping means 50 is arranged inside the door panel 24 (that is, the inner space formed by joining the inner panel 28 and the outer panel 26), and is fixed to the door side by a fixture 58 that fixes the door side fixing portion 36 to the door panel 24. It is attached to the fixed part 36 .

In this embodiment, the damping means 50 has a body portion 52 that damps vibration energy and a holding portion 51 that holds the body portion 52 . In this embodiment, the body portion 52 is composed of a rubber member 54 that is a damping portion that damps vibration energy, and a housing that accommodates the rubber member 54 . The holding portion 51 constitutes an attachment portion for the door-side fixing portion 36 and is formed of a metal plate having higher rigidity than the door panel 24, such as a steel plate. In the present embodiment, bolts, which are fasteners 58, pass through the door-side base portions 36a and 36b of the door-side fixing portion 36, the front flange portion 28b of the inner panel 28, and the holding portion 51. , the door-side base portions 36a and 36b and the holding portion 51 are fastened together.

In the door structure 20 of the second embodiment, vibration energy transmitted from the vehicle body 12 to the door-side fixing portion 36 via the vehicle-body-side fixing portions 32 of the door hinges 30A and 30B and the hinge shaft 34 is transmitted to the door-side fixing portion 36. is transmitted to the damping means 50 via a fixture 58 that fixes the inner panel 28 to the damping means 50 and is damped by the damping means 50 . As a result, the vibration energy transmitted to the outer panel 26 can be reduced, and the vibration of the outer panel 26 as a whole can be efficiently suppressed.

Further, in the present embodiment, a general vehicle door hinge having a bracket structure for the door-side fixing portion 36 can be used as the door hinges 30A and 30B, so that the manufacturing cost can be suppressed. Further, since the damping means 50 can be attached using the fixture 58 for fixing the door-side fixing portion 36 to the door panel 24, a simple and inexpensive structure can be achieved.

(Third Embodiment)
FIG. 7 is an illustration similar to FIG. 4 showing a third embodiment of the door structure 20. As shown in FIG. In 3rd Embodiment, the same code|symbol is attached|subjected to the structure similar to 2nd Embodiment. The door structure 20 of the third embodiment differs from that of the second embodiment in the mounting structure of the damping means 50 . Since other configurations and structures are the same as those of the second embodiment, details thereof will be omitted in the following description.

In this embodiment, the damping means 50 is formed of a sheet-like rubber member 54 having a predetermined thickness. In the illustrated example, the thickness of the rubber member 54 is formed larger than the thickness of the door-side base portions 36 a and 36 b of the door-side fixing portion 36 . The damping means 50 is disposed between the door fixing portion 36 and the door panel 24 and is attached to the door fixing portion 36 by fasteners 58 that fix the door fixing portion 36 to the door panel 24 . Specifically, the damping means 50 is held between the door side base portions 36a and 36b of the door side fixing portion 36 and the front flange portion 28b of the inner panel 82, and is fixed by a fixture 58. , the door-side bases 36a and 36b and the damping means 50 are fastened together with bolts.

In the door structure 20 of the third embodiment, vibration energy transmitted from the vehicle body 12 to the door-side fixing portion 36 via the vehicle-body-side fixing portions 32 of the door hinges 30A and 30B and the hinge shaft 34 is transmitted to the door-side fixing portion 36. Vibrational energy is transmitted directly from the door-side bases 36a, 36b and the fixture 58 to the damping means 50, and the damping means 50 can attenuate the vibrational energy. Since the damping means 50 is arranged between the door-side fixing portion 36 and the inner panel 28, it can damp vibration energy before it is transmitted to the door panel 24, thereby reducing the vibration of the outer panel 26 as a whole. can be efficiently suppressed. Further, since the damping means 50 can be attached using the fixture 58 for fixing the door-side fixing portion 36 to the door panel 24, a simple and inexpensive structure can be achieved.

The damping means 50 of the third embodiment can also be used in conjunction with the structure described in the second embodiment. In such a case, the effect of damping vibration energy can be further improved.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the scope of the invention.

For example, in the above-described embodiment, the damping means 50 is attached to each of the door hinges 30A and 30B, but the damping means 50 may be attached to either one of the door hinges 30A or 30B.

REFERENCE SIGNS LIST 10 vehicle 12 vehicle body 13 front pillar 20 door structure 22 door 24 door panel 26 outer panel 28 inner panel 30A, 30B door hinge 32 vehicle body side fixing portion 34 hinge shaft 35, 36 door side fixing portion 50 damping means

Claims (5)

a door panel having an outer panel forming the outer surface of a vehicle door and an inner panel disposed on the vehicle inner side of the outer panel;
The vehicle body has a vehicle body side fixed portion that is fixed to a vehicle body, and a door side fixed portion that is rotatable with respect to the vehicle body side fixed portion via a hinge shaft and is fixed to the door panel. a door hinge that rotatably supports the door panel with respect to;
In a vehicle door structure comprising
A vehicle door structure comprising damping means attached to the door-side fixing portion and capable of damping vibration energy transmitted to the door-side fixing portion. The door-side fixing portion is formed in a tubular shape and is fixed to the inner panel in a state in which the hinge shaft penetrates in the radial direction,
2. The vehicle door structure according to claim 1, wherein the damping means is mounted inside the cylindrical door-side fixing portion. 2. The vehicle according to claim 1, wherein said damping means is disposed inside said door panel and is attached to said door side fixed portion by means of fasteners for fixing said door side fixed portion to said door panel. door structure. The damping means is arranged between the door-side fixed portion and the door panel, and is attached to the door-side fixed portion by a fixture for fixing the door-side fixed portion to the door panel. Item 1. The vehicle door structure according to item 1. The vehicle door structure according to any one of claims 1 to 4, wherein the damping means is a rubber member, a liquid seal mount or a damper.

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