JP2005088785A - Mounting structure of vehicular head lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To damp the vibration of a head lamp caused by the vibration of a chassis frame. <P>SOLUTION: A lamp stay 17 is fixed to the chassis frame 11, and a mounting flange 23a is formed on the periphery of the head lamp 23. The mounting flange has a mounting hole 23b into which a male screw 24 is inserted to be screwed on the periphery of the lamp stay 17 to fit the head lamp 23 to the lamp stay 17. The head lamp 23 is provided with a dynamic damper 31 for damping vibrations. The dynamic damper 31 comprises a metal plate 32 annexed to the back of the head lamp 23, a rubber block 33 whose base end is fitted to the back of the metal plate 32, a mass damper 34 fitted to the top of the rubber block 33, and a doughnut-shaped elastic body 36, which is fitted on the male screw 24 to be set between the mounting flange 23a and the lamp stay 17 and keep the head lamp 23 lifted above the lamp stay 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle headlamp mounting structure in which a headlamp is attached to a lamp stay fixed to a chassis frame.

  2. Description of the Related Art Conventionally, as a mounting structure for a vehicle headlamp, a structure in which a headlamp is attached to a lamp stay directly fixed to a chassis frame has been proposed (see, for example, Patent Document 1). In this mounting structure, an opening is formed at a position corresponding to the headlamp of the bumper fixed to the vehicle body, and the leading end of the lamp stay and the end of the bumper are connected by the auxiliary stay. The auxiliary stay is formed wide in the vertical direction, and a pair of attachment portions for attachment to the lamp bracket and the bumper are formed at both ends. Between these attachment parts, an impact absorbing part formed in a V-shaped or Ω-shaped cross section is provided. In the mounting structure configured in this way, even if the front bumper receives an impact from the side or the front and causes a slight deformation, the impact is reliably absorbed by the impact absorbing portion of the auxiliary stay. Does not deform. As a result, the headlamp can always maintain normal illumination without causing a significant shift in the optical axis.

In order to prevent the headlamp from being damaged when a load is applied to the bumper, a stopper is projected from the tip of the lamp stay fixed to the chassis frame, and a gap between the stopper and the bumper is provided for the lamp. A vehicle headlamp mounting device formed narrower than a gap between a headlamp and a bumper mounted on a stay has also been proposed (see, for example, Patent Document 2). In this vehicle headlamp mounting device, when a small load is applied to the bumper from the front or obliquely forward, the bumper is deformed in a direction approaching the stopper and the headlamp. At this time, since the gap between the stopper and the bumper is formed narrower than the gap between the headlamp and the bumper, the bumper does not contact the headlamp but can contact the stopper and prevent damage to the headlamp. .
Japanese Utility Model Publication No. 4-3880 JP 2002-240619 A

However, in the conventional mounting structure in which the headlamp is attached to the lamp stay fixed to the chassis frame, the vibration of the chassis frame that is generated when the vehicle travels is directly transmitted to the lamp stay and the headlamp also vibrates, and the light of the headlamp The problem to be solved still remains that the shaft vibrates and causes flickering. In particular, the conventional headlamp has a problem in that it resonates due to the vibration of the chassis frame around 11.5 Hz, and its optical axis vibrates with a relatively large amplitude, causing a significant flicker to the driver.
An object of the present invention is to provide a vehicle headlamp mounting structure that can reduce headlamp vibration caused by chassis frame vibration.

In the invention according to claim 1, as shown in FIG. 1, a lamp stay 17 is fixed to the chassis frame 11, a mounting flange 23a is provided around the headlamp 23, and a mounting hole 23b formed in the mounting flange 23a. This is an improvement in the mounting structure of the vehicle headlamp in which the male screw 24 is inserted into the lamp stay 17 and the male screw 24 is screwed around the lamp stay 17 so that the headlamp 23 is attached to the lamp stay 17.
The characteristic configuration is that the headlamp 23 is provided with a dynamic damper 31 for vibration damping.
In the vehicle headlamp mounting device described in claim 1, the presence of the dynamic damper 31 causes an inertial force that does not vibrate the headlamp 23, thereby reducing the vibration of the headlamp caused by the vibration of the chassis frame 11. To do.

The invention according to claim 2 is the invention according to claim 1, wherein the dynamic damper 31 includes a metal plate 32 attached to the back surface of the headlamp 23, and a rubber having a base end attached to the back surface of the metal plate 32. The vehicle includes a block 33, a mass damper 34 attached to the tip of the rubber block 33, and an elastic body 36 that is provided between the attachment flange 23 a and the lamp stay 17 and floats the headlamp 23 from the lamp stay 17. This is a headlamp mounting structure.
In the vehicle headlamp mounting structure according to the second aspect, the mass damper 34 vibrates at a specific frequency through the rubber block 33, so that the natural vibration of the entire headlamp 23 provided with the dynamic damper 31 is obtained. Change the number. The elastic body 36 is interposed between the headlamp 23 and the lamp stay 17 to absorb the vibration of the lamp stay 17 and relatively reduce the amplitude at the time of resonance of the headlamp 23 around 11.5 Hz. The vibration of the headlamp 23 caused by the vibration of the chassis frame 11 is effectively reduced.

In the vehicle headlamp mounting structure according to the present invention, the headlamp is provided with a dynamic damper for vibration damping. Therefore, due to the presence of the dynamic damper, an inertial force that does not vibrate the headlamp acts, resulting from the vibration of the chassis frame. The vibration of the headlamp can be effectively reduced.
In addition, the dynamic damper includes a metal plate attached to the back surface of the headlamp, a rubber block having a base end attached to the back surface of the metal plate, a mass damper attached to the tip of the rubber block, a mounting flange, and a lamp stay. If the mass damper provided via the rubber block vibrates at a specific frequency, the headlamp can be provided with an elastic body that floats from the lamp stay. The frequency can be changed, and the elastic body absorbs the vibration of the lamp stay and prevents the vibration from being transmitted to the headlamp. As a result, the vibration of the headlamp caused by the vibration of the chassis frame can be reduced more effectively.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the truck 10 is provided with a chassis frame 11 extending in the traveling direction, and a front bumper 12 is attached to a front portion of the chassis frame 11 via a bumper stay 13. The front bumper 12 is attached to the chassis frame 11 so as to extend in the vehicle width direction below the front surface of the cab 10a. The bumper stay 13 is formed in a substantially T shape, and a base portion 13a fixed to the front outer surface of the chassis frame 11 by bolts and nuts (not shown), and a bumper fixed to the base portion 13a extending in the vehicle width direction. And an attachment portion 13b. A reinforcing member 14 is welded to the rear surface of the front bumper 12, and a plurality of bolts 15 are welded to the reinforcing member 14 so as to protrude rearward. The front bumper 12 is fixed to the bumper mounting portion 13 b by the plurality of bolts 15 and nuts 16.

  The base end of the lamp stay 17 is attached to the front outer surface of the chassis frame 11. The lamp stay 17 includes a stay mounting portion 18 having a high rigidity structure attached to the chassis frame 11, a stay body 19 having a low rigidity structure having a base portion fixed to the stay mounting portion 18 and a pair of arms extending outward in the vehicle width direction. Have The stay mounting portion 18 is formed into a channel shape by pressing a steel plate, and the base portion 19a and the pair of arms 19b and 19c of the stay main body 19 are integrally formed so that the cross-sectional shape becomes a channel shape by pressing the steel plate. Is done. Further, the base ends of the stay attaching portion 18 and the stay main body 19 are sandwiched between the reinforcing member 14 and the bumper attaching portion 13b. A pair of stoppers 21, 21 project from the tip of the stay body 19 toward the front bumper 12.

  These stoppers 21 and 21 are integrally formed in a state where the stoppers 21 and 21 are connected to each other by a connecting member 22 by pressing a steel plate, and are welded in a state where the stoppers 21 and 21 are stretched over the ends of the pair of arms 19b and 19c. The stay body 19, the pair of stoppers 21 and 21, and the connecting member 22 form a square hole 19 d. As shown in FIGS. 1 and 2, a mounting flange 23a is provided around the headlamp 23, and a mounting hole 23b is formed in the mounting flange 23a. Through holes 19e and 22a are formed in the stay main body 19 and the connecting member 22 of the lamp stay 17 facing the mounting hole 23b, respectively, and a female screw 26 is coaxially welded to the through holes 19e and 22a on the rear surface. The headlamp 23 is provided with a dynamic damper 31 for damping vibration.

  The dynamic damper 31 in this embodiment includes a metal plate 32, a rubber block 33 having a base end attached to the back surface of the metal plate 32, and a mass damper 34 attached to the tip of the rubber block 33. The metal plate 32 is formed to have a size so as to cover the square hole 19d, and is inserted so as to face the mounting hole 23b formed in the mounting flange 23a around the mounting flange 23a provided in the headlamp 23. A hole is formed. The male screw 24 is inserted from the front into the mounting hole formed in the mounting flange, and then inserted into the insertion hole 32a around the metal plate 32. A donut-shaped elastic body 36 is fitted into the male screw 24 that has passed through the insertion hole 32a. In this state, the male screw 24 is screwed into the female screw 26 from through holes 19e and 22a provided around the lamp stay 17.

  As a result, the headlamp 23 is attached to the lamp stay 17, and a metal plate 32 is attached to the back surface of the headlamp 23. The donut-shaped elastic body 36 inserted into the male screw 24 is interposed between the mounting flange 23a of the headlamp 23 and the lamp stay 17 so that the headlamp 23 is lifted from the lamp stay 17 and the male screw 24 is inserted. Is attached to the lamp stay 17. 2 and 3, the front bumper 12 is formed with an opening 12 a so that the headlamp 23 faces. Reference numeral 25 in FIGS. 2 and 3 is a spoiler attached to the lower end of the front bumper 12.

The operation of the vehicle headlamp mounting structure thus configured will be described.
When the truck 10 travels, vibration inherent to the chassis frame 11 is generated, and the lamp stay 17 fixed to the chassis frame 11 also vibrates together with the chassis frame 11. When the lamp stay 17 vibrates, the male screw 24 screwed into the stay 17 vibrates in the same manner. However, in the mounting structure of the headlamp 23 according to the present invention, the headlamp 23 is levitated from the lamp stay 17 due to the presence of the donut-shaped elastic body 36, and a dynamic damper 31 for vibration damping is provided on the headlamp 23. Is provided. The presence of the dynamic damper 31 causes an inertial force that does not vibrate the headlamp 23, and the donut-like elastic body 36 is interposed between the headlamp 23 and the lamp stay 17 to absorb the vibration of the lamp stay 17. The vibration is prevented from being directly transmitted to the headlamp 23. As a result, it is possible to effectively avoid a situation in which the vibration of the chassis frame 11 generated during the traveling of the truck 10 is directly transmitted to vibrate the headlamp 23 and the optical axis of the headlamp 23 vibrates.

  Here, the dynamic damper 31 includes the mass damper 34 attached to the metal plate 32 attached to the back surface of the headlamp 23 via the rubber block 33, so that the mass damper 34 has a natural frequency via the rubber block 33. By vibrating, the natural frequency of the entire headlamp 23 provided with the dynamic damper 31 changes, and in particular, the amplitude at the time of resonance of the headlamp 23 at around 11.5 Hz can be made relatively small. As a result, the vibration of the headlamp 23 caused by the vibration of the chassis frame 11 is remarkably reduced, and it is possible to effectively avoid the occurrence of a significant flicker phenomenon in the driver.

In the above embodiment, the lamp stay has the stay mounting portion and the stay main body. However, the lamp stay may have no stay mounting portion. In this case, the base end of the lamp stay (stay body) is directly attached to the chassis frame, or is attached to the chassis frame via the bumper stay.
Moreover, in the said embodiment, although the stopper was fixed to the front-end | tip of a stay main body, there may not be a stopper. In this case, by making the gap between the tip of the lamp stay and the bumper narrower than the gap between the headlamp and the bumper, the bumper contacts the tip of the lamp stay when a small load is applied to the bumper from the front or diagonally forward. Can be made.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 showing the mounting structure of the vehicle headlamp of the present invention. The D section exploded perspective view of FIG. The front view of the truck containing the headlamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Chassis frame 17 Lamp stay 23 Headlamp 23a Mounting flange 23b Mounting hole 24 Male screw 31 Dynamic damper 32 Metal plate 33 Rubber block 34 Mass damper 36 Donut-shaped elastic body

Claims (2)

A lamp stay (17) is fixed to the chassis frame (11), a mounting flange (23a) is provided around the headlamp (23), and a male screw is inserted into a mounting hole (23b) formed in the mounting flange (23a). (24) is inserted, the male screw (24) is screwed around the lamp stay (17), and the headlamp (23) is attached to the lamp stay (17). In structure
The vehicle headlamp mounting device, wherein the headlamp (23) is provided with a dynamic damper (31) for damping vibration. The dynamic damper (31) includes a metal plate (32) attached to the back surface of the headlamp (23), a rubber block (33) having a base end attached to the back surface of the metal plate (32), and the rubber block. A mass damper (34) attached to the tip of (33), and an elasticity provided between the mounting flange (23a) and the lamp stay (17) to float the headlamp (23) from the lamp stay (17) The vehicle headlamp mounting structure according to claim 1, further comprising a body (36).

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