JP2007198443A - Dynamic damper for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper for a vehicle capable of preventing an inertia body from being scattered by deterioration or the like of an elastomer in the dynamic damper with the lapse of time, to prevent surely other vehicular body constitutive material from being damaged secondarily. <P>SOLUTION: This dynamic damper D for the vehicle fixed onto a vertical wall part of the vehicular body constitutive material receiving vibration from a vibration source is provided with a frame body 33 with a base part fastened onto the vertical wall part 223, the inertia body 35 connected to the frame body via an elastic member 34, and arranged in a space e inside the frame body to be vertically movable, and stoppers 36 extended bently from upper and lower end edges of the frame body to prevent the inertia body 35 from coming out of the frame inside space e. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle dynamic damper in which an inertial body is provided in a frame attached to a vehicle body component member via an elastic member so as to be capable of absorbing vibration.

  The vehicle receives vibrations according to the road surface reaction force as it travels, and these vibrations are transmitted to the passengers in the passenger compartment through the vehicle body components, and the rotation transmission system that is a part of the vehicle body components is It vibrates when the rotational force is transmitted to the wheels, and these vibrations are also transmitted to the passengers in the passenger compartment. As described above, even if the passenger compartment is closed from the outside, various vibrations are transmitted to the occupant through the vehicle body constituting member, thereby reducing the occupant's comfortability.

  Therefore, in order to reduce various types of vibration from each vibration source toward the vehicle interior, for example, a differential device serving as a vibration source is fastened and supported at a plurality of locations using elastic bushes on the vehicle body frame. However, it is possible to reduce the vibration in the vibration transmission path from the differential device through the vehicle body frame toward the passenger compartment. However, it is known that a sufficient vibration-proofing effect cannot be obtained only by using such a vibration-absorbing elastic bush, and vibration absorption is positively performed by a dynamic damper provided in a vibration transmission path.

  For example, an example of the dynamic damper is employed in the power train damping structure of Japanese Patent Application Laid-Open No. 2004-150511 (Patent Document 1). As shown in FIG. 8, the dynamic damper 100 here is intended to reduce vibration of the power plant frame 130 that increases the rigidity of the vehicle by mutually connecting a transmission 110 and a rear differential 120 that are positioned in the front and rear of the vehicle body. . Here, the dynamic damper 100 includes a plate-like pedestal 140 attached to an intermediate portion of the power plant frame 130, a pair of base portions 150 protruding from the pedestal 140, and an elastic body (not shown) disposed between the pair of base portions 150. And an inertial body (mass) 160 connected to the base 150 facing each other. As the elastic body (rubber) (not shown) is elastically displaced in conjunction with the displacement of the inertial body 160, the vibration of the power plant frame 130 is reduced by converting the vibration displacement into heat energy and dissipating it to the atmosphere. Attenuation is performed to obtain quietness due to vibration displacement of the power plant frame 130.

JP 2004-150511 A

  By the way, in the dynamic damper 100 attached to the intermediate part of the power plant frame 130 of the cited document 1, both ends of the inertial body 160 are elastic bodies (rubbers) between a pair of base parts 150 protruding from the pedestal 140. They are only combined. Here, the elastic body (rubber) is exposed to the outside in consideration of ensuring heat dissipation, and easily deteriorates with time. For this reason, if the elastic body (rubber) is damaged, the inertial body 160 may scatter and collide with other rotation transmission members or the like on the vehicle body side, which may cause a secondary damage. It has become.

  The present invention has been made paying attention to the above-mentioned problems. The object of the present invention is to prevent scattering of inertial bodies due to deterioration over time of the elastic bodies of dynamic dampers, and to prevent other body component members from being scattered. It is an object of the present invention to provide a vehicle dynamic damper that can reliably prevent secondary damage.

  In order to achieve the above-mentioned object, in the dynamic damper of a vehicle fixed to the vertical wall portion of the vehicle body constituent member that receives vibration from the vibration source according to claim 1, the dynamic damper has a base portion fastened to the vertical wall portion. A frame body, an inertial body connected to the frame body via an elastic member, and arranged to be vertically movable in the space within the frame body, and bent and extended from the upper and lower edges of the frame body, And a stopper piece for preventing the body from leaving the body space.

  According to a second aspect of the present invention, in the vehicle dynamic damper according to the first aspect, the frame body overlaps the vertical wall portion and is fastened to each other, and a pair of substrate portions are integrally coupled. And a strip plate-like frame portion that forms a rectangular frame body space between the vertical wall portion and the inner plate portions of the strip plate-like frame portion that are opposed to each other through elastic bodies. Upper and lower stopper pieces that cover the main parts of the upper and lower openings of the frame body space are formed to extend toward the vicinity of the vertical wall portion at the upper and lower end edges of the band plate frame portion. It is characterized by that.

  According to a third aspect of the present invention, in the vehicle dynamic damper according to the first or second aspect, the vehicle body constituent member is a bracket fastened to the propeller shaft input side of the differential device of the vehicle, and the vertical wall portion of the bracket The dynamic damper is fixed to the above.

  According to the dynamic damper of the vehicle according to claim 1, since the detachment of the inertial body from the frame body space of the dynamic damper is prevented by the stopper pieces bent and extended from the upper and lower end edges of the frame body, If the inertial body fluctuates, it can be reliably prevented that the inertial body scatters and abuts against the peripheral base material to cause secondary damage. Therefore, it is possible to know the abnormality of the dynamic damper and replace it relatively quickly.

  According to the vehicle dynamic damper of the second aspect, the inertial body connected to both inner wall portions of the belt-like frame portion via the elastic body operates to dampen the vibration in the space inside the frame, and moves up and down when the elastic body is damaged. The upper and lower stopper pieces covering the opening can reliably prevent the inertial body from scattering, and in particular, the upper and lower stopper pieces are formed to extend in the vicinity of the vertical wall portion, so that a clearance is secured between them so that the outside air for heat dissipation can be prevented. The passage can be secured, and the belt-like frame portion can integrally form the pair of substrate portions and the pair of stopper pieces, so that the manufacturing cost can be reduced.

  According to the vehicle dynamic damper of the third aspect, the dynamic damper is fixed to the portion where the vertical swing displacement around the left and right drive shafts on which the differential protrudes is relatively large via the bracket. The vibration reduction function can be demonstrated well.

FIG. 1 shows a dynamic damper D for a vehicle as an embodiment of the present invention.
The dynamic damper D of the vehicle is mounted on a rear differential mount bracket (hereinafter simply referred to as a rear bracket) 22 used in the lower front vehicle body shown in FIG. 3 and functions to reduce vibration of the rear bracket 22.
As shown in FIG. 3, the lower front car body includes a pair of left and right side members 1 and 2 that are long in the front-rear direction X, and a plurality of cross members that are integrally connected between the side members 1 and 2 and are sequentially disposed in the front-rear direction. A well-shaped base frame portion A composed of 3 and 4 is provided, and a part of the front differential device (hereinafter simply referred to as front differential) 8 of the rotation transmission system PT of the vehicle is supported by the well-shaped base frame portion A.

  The front differential 8 receives a rotational force from an engine (not shown) via the propeller shaft 5 and branches and transmits the rotational force to the left and right front wheels via the left and right drive shafts 6 and 7. That is, in the front differential casing 9 of the front differential 8, a reduction gear train (not shown) that reduces the rotational force from the propeller shaft 5 side at a predetermined reduction ratio, and rotation of the reduction gear train to the left and right drive shafts 6, 7. A differential gear train (not shown) that branches and transmits so as to be capable of relative rotation is provided. Further, the front differential casing 9 is provided with a front mounting portion 18 on its front facing wall, to which a front differential mount bracket (hereinafter simply referred to as a front bracket) 19 is fastened, and a left vertical wall on the opposite side of the vehicle compartment as a rear portion. A rear mounting portion 21 is provided, and a rear differential mount bracket (hereinafter simply referred to as a rear bracket) 22 is fastened thereto.

  The first and second cross members 3 and 4 are sequentially welded to the front side of the left and right side members 1 and 2 forming the above-described well-shaped base frame portion A. The front fastening brackets 23 and 24 are welded, and the rear fastening bracket 30 is welded near the rear side of the left welded portion of the second cross member 4. The left and right front fastening brackets 23 and 24 fasten the left and right fastening portions 25 and 26 of the front bracket 19, and the rear fastening bracket 30 connects the fastening portion 28 at the rear end of the rear bracket 22.

The base portions of the left and right front fastening brackets 23 and 24 are respectively welded to the left and right side members 1 and 2, and the left and right front fastening brackets 23 and 24 are elastically connected to the left and right fastening portions 25 and 26 of the front bracket 19, respectively. The bolts 27 are fastened to each other via the bush r.
As shown in FIG. 3, the front bracket 19 is a sheet metal member that is long in the vehicle width direction Y. Fastening portions 25 and 26 are formed on the left and right ends, and the left and right side members 1 and 2 are interposed via the left and right fastening portions 25 and 26. Are fastened at two fastening points P1, P2. Accordingly, the rolling displacements on the left and right sides of the front differential 8 can be supported so as to be reliably suppressed at the left and right positions of the front bracket 19.

The second cross member 4 is a rear portion of the well-shaped base frame portion A, and is disposed close to a vehicle compartment (not shown). A rear fastening bracket 30 is welded in the vicinity of the rear side of the left end weld portion of the second cross member 4. Thereafter, as shown in FIG. 3, the fastening bracket 30 includes a pair of leg portions 301 welded to the vehicle central side wall of the left side member 1, a projecting wall portion 302 connecting the projecting ends of the both leg portions, and both legs. An auxiliary bracket 303 that couples the opposing wall surfaces of the portion 301 to each other, and a nut pipe 304 that is disposed between the auxiliary bracket 303 and the protruding wall portion 302 and is integrally coupled.
Here, the front end of the nut pipe 304 protrudes from the protruding wall portion 302, and the fastening portion 28 at the rear end of the rear bracket 22 is fastened by a fastening bolt 29 to that portion.

As shown in FIGS. 3 and 4, the rear bracket 22 is bent and extended from the rear attachment portion 21 (see FIG. 3) of the left vertical wall portion on the rear end side of the front differential 8 to the rear fastening bracket 30. The rear bracket 22 includes a vertical wall main portion 221 formed of a sheet metal member, a flange 222 bent and extended from the peripheral edge thereof, and a fastening portion 28 formed on the rear end side of the vertical wall main portion 221. An attachment portion 223 for the dynamic damper D is formed in the vicinity of the fastening portion 28 on the rear end side of the vertical wall main portion 221.
Here, the rear bracket 22 extends slightly toward the left side in the vehicle width direction Y (passenger seat side of the passenger compartment), so that the front differential 8 that is sequentially disposed toward the front and rear in the approximate center of the vehicle body. The rear end bearing portion 13, the universal joint 11, and the propeller shaft 5 can be disposed avoiding interference.

As shown in FIG. 4, the fastening portion 28 formed at the vehicle compartment facing end, which is the rear end of the rear bracket 22, has a mounting hole h <b> 1 formed in the vertical wall main portion 221, an annular flange h <b> 2 at the periphery thereof, And a bush r provided with a pipe portion h3 into which a fastening bolt 29 is inserted and fitted in the annular flange h2. The fastening bolt 29 inserted into the pipe portion h3 is fastened to the nut pipe 304 of the rear fastening bracket 30 so that the rear end of the rear bracket 22 is fastened at the fastening point P3.
In this way, the front differential 8 has the rear bracket 22 integrally coupled to the rear end side thereof, and is disposed rearward by L from the positions of the left and right drive shafts 6 and 7.
As shown in FIGS. 1 and 2, a dynamic damper D is coupled to the mounting portion 223 on the rear end side of the rear bracket 22 with a fastening bolt 32.

The dynamic damper D is a rectangular body connected to a mounting portion 223 by a fastening bolt 32 and a left and right inner wall surfaces of the frame body 33 that are connected to each other via rubber blocks 34 that are elastic members. The thick plate-like inertial body 35 is provided.
Here, the frame body 33 overlaps the attachment portion 223 which is a vertical wall and is fastened to each other, a strip-like frame portion 332 that continuously and integrally couples between the pair of substrate portions 331, The upper and lower stopper pieces 36 that are bent from the upper and lower end edges of the belt-like frame portion 332 and are opposed to the attachment portion 223 via the gap g are continuously formed over almost the entire area of the belt-like frame portion 332, A bead portion 333 that reinforces the rigidity of the body 33.

In particular, as shown in FIG. 5, the frame body 33 which is a sheet metal member, as shown in FIG. 5, includes a1 for a pair of substrate portions 331, a2 for a strip plate frame portion 332, and upper and lower stopper pieces 36. The unprocessed base material PL obtained by integrally press-molding a3 and the bead portion 333 continuously formed on the a1 for the strip-shaped frame portion 332 is used, and the unprocessed base material PL is arranged along each bending line d. Thus, the frame 33 can be easily manufactured by bending, and the cost can be reduced by facilitating the manufacture.
The inertia body 35 is made of iron and has a rectangular bar shape, and its left and right end surfaces are vulcanized and bonded to the left and right inner wall surfaces fi of the frame 33 via a pair of rubber blocks 34.

  As shown in FIGS. 2A to 2C, the belt-like frame portion 332 is bent so as to form a substantially rectangular frame body space e, and the upper and lower stopper pieces 36 are formed from the upper and lower edges of the central portion. Protrusions are formed. The upper and lower stopper pieces 36 have a size covering the main part of the frame body space e. That is, even if the rectangular rod-like inertial body 35 tries to scatter from the frame body space e (shown by a two-dot chain line in FIG. 1), It has a size that can prevent In addition, the peripheral edge following the U-shape of the upper and lower stopper pieces 36 is continuously formed with a ventilation gap g between the opposing mounting portion 223 and the like, so that as shown in FIGS. 2 (b) and 2 (c). The frame space e facilitates the circulation of the outside air by the upper and lower ventilation gaps g. When the inertial body 35 vibrates vertically and horizontally in the frame body space e, the left and right rubber blocks 34 interlocked therewith repeats elastic displacement and generates heat. If this heat generation becomes excessive, the left and right rubber blocks 34 are prematurely deteriorated. Here, the heat generated in the left and right rubber blocks 34 in the frame body space e is radiated to the outside air passing through the ventilation gap g by natural circulation. Thus, it is easily cooled, the breakage due to deterioration of the left and right rubber blocks 34 can be suppressed, durability can be ensured, and scattering of the rectangular rod-like inertial body 35 can be avoided.

The operation of the dynamic damper of the vehicle in FIG. 1 will be described.
When the vehicle having the rear bracket 22 for attaching the dynamic damper of the vehicle of FIG. 1 travels, the front differential 8 has three points including left and right fastening points P1, P2 and a compartment facing fastening point P3 with respect to the well-shaped base frame A. Therefore, the vibration of the front differential 8 is divided into three and is damped by the elastic bush r at each fastening point.
In this case, the respective rolling displacements on the left and right sides of the front differential 8 are reliably suppressed at the left and right fastening points P1 and P2, and the vertical vibration around the left and right drive shafts 6 and 7 of the front differential 8 is behind the left and right drive shafts 6 and 7. Absorbed by the dynamic damper D disposed in the attachment portion 223 near the fastening point P3 separated by the distance L.

  That is, since the dynamic damper D is disposed on the mounting portion 223 on the rear bracket 22 where the vertical swing displacement around the left and right drive shafts is relatively large, the vertical vibration at the same portion can be reliably reduced, and the vibration The reduction function can be efficiently exhibited, the vibration reaching the passenger compartment side behind the rear bracket 22 can be reliably reduced, and the occupant's comfortability can be suppressed.

In particular, the dynamic damper D here is broken when the left and right rubber blocks 34 that have performed the vibration absorbing function in the frame space e have deteriorated over time and are subjected to excessive vertical vibration from the road surface. Suppose that the rectangular rod-like inertial body 35 deviates from the steady position. However, the inertia body 35 is prevented from being scattered outside the frame body space e by the upper and lower stoppers 36, and only repeatedly collides with the inner wall surfaces of the upper and lower stoppers 36 and the strip plate frame portion 332. For this reason, even if the left and right rubber blocks 34 are damaged, it is possible to reliably prevent the occurrence of a situation in which the inertial body 35 scatters and comes into contact with the peripheral base material of the vehicle to cause secondary damage.
In addition, when the inertial body 35 fluctuates due to vibration from the road surface in the frame body space e during traveling, noise is generated due to contact with the stopper piece or the belt-like frame portion 332, so that the dynamic damper D is relatively quickly obtained. An occupant can be aware of this abnormality and can be replaced relatively early.

  Further, the dynamic damper D continuously forms a ventilation gap g with the mounting portion 223, and ventilation of the frame body space e can be easily performed by natural circulation through the ventilation gap g. When it vibrates up and down and left and right in conjunction with the inertial body 35, the heat generated by the rubber block 34 can be easily dissipated, it can be easily cooled, and the breakage due to deterioration of the left and right rubber blocks 34 is suppressed. This can be avoided and secondary damage of the surrounding vehicle body components can be prevented.

Further, since the dynamic damper D is mounted on the passenger seat side of the rear bracket 22, that is, the side not facing the member such as the propeller shaft 5 of the rotation transmission system PT, even if the member such as the inertial body 35 of the dynamic damper D is damaged. Even if it is assumed that scattering occurs, collision with the members of the rotation transmission system PT can be avoided, and secondary damage of the rotation transmission system PT can be prevented.
As described above, the dynamic damper D of the vehicle shown in FIG. 1 employs a configuration in which the frame 33 includes the belt-like frame portion 332 and the upper and lower stopper pieces 36 that are integrally connected to each other between the pair of substrate portions 331. However, as a modification thereof, a dynamic damper Da as shown in FIGS. 6, 7A, and 7B can be used.

The dynamic damper Da in FIG. 6 is different from the dynamic damper D in FIG. 1 in that the main frame portion 42 is different and the mounting structure of the rubber block 34a and the inertial body 35a, which are elastic members, is substantially the same.
The dynamic damper Da includes left and right substrate portions 41 coupled to the mounting portion 223 of the rear bracket 22 by fastening bolts 32, and a main frame portion 42 that continuously and integrally couples the pair of substrate portions 41 to each other. The bowl-shaped main frame portion 42 is a bowl-shaped main body that connects the pair of vertical plate portions 421 that are bent and protruded from the end portions of the respective substrate portions 41 and the peripheral portions of the pair of vertical plate portions 421. A curved main wall portion 422. The curved main wall portion 422 has a horizontally reinforcing bead 425 formed at the center thereof, and upper and lower long window portions 423 and 424 are formed in the vicinity of the upper and lower ends along the longitudinal direction thereof. An inertia body 35a is attached between the pair of vertical plate portions 421 via left and right rubber blocks 34a.

Such a dynamic damper Da receives vertical swing displacement about the left and right drive shafts 6 and 7 during traveling, as in the case of the dynamic damper D of FIG. 1, and this is surely caused by the vertical vibrations of the inertia body 35a and the rubber block 34a. The reduction processing can be efficiently performed, and the vibration reduction function can be efficiently exhibited.
Furthermore, even if the inertial body 35a moves out of the steady position due to the breakage of the rubber block 34 in the frame body space e of the dynamic damper Da, the inertial body 35 can be prevented from scattering out of the frame body space e, and the inertial body 35a is scattered. Thus, it is possible to reliably prevent the occurrence of a situation in which secondary damage occurs due to contact with the peripheral base material of the vehicle.

  In particular, the dynamic damper Da has upper and lower long window portions 423 and 424 formed in the curved main wall portion 422, through which ventilation of the frame body space e can be easily performed by natural circulation, and the inertial body 35a is formed in the frame body space e. Even if the rubber block 34a generates heat in conjunction with it, it can be easily dissipated and easily cooled, and the breakage due to deterioration of the left and right rubber blocks 34a can be suppressed, and in this respect also, scattering of the inertial body 35a can be avoided. Secondary damage of the vehicle body constituent member can be prevented. Furthermore, since the bowl-shaped curved main wall portion 422 is curved, it is easy to ensure rigidity.

  In the above description, both the dynamic dampers D and Da have been described as being attached to the rear bracket 22 of the front differential 8. However, the present invention is not limited to this, and the dynamic dampers D and Da may be attached to the front bracket 19 and You may attach directly to a side wall. Furthermore, the dynamic dampers D and Da can be mounted on other vehicle body structural members that vibrate in response to the vibration of the vehicle rotation transmission system PT. In these cases, the same effects as the dynamic damper D of FIG. It is done.

It is a side view of the dynamic damper of vehicles as one embodiment of the present invention. 1A is a partially cutaway plan view, FIG. 1B is a sectional view taken along line X1-X1 in FIG. 1, and FIG. 1C is a sectional view taken along line X2-X2 in FIG. It is an enlarged notched top view of the well-shaped base frame part of the front part of the motor vehicle equipped with the rear bracket which attached the dynamic damper of FIG. It is a side view of the front differential supported by the well-shaped base frame part of FIG. It is an expanded view of the base material which manufactures the frame body of the dynamic damper of FIG.

It is a side view of the dynamic damper of vehicles as other embodiments of the present invention. The dynamic damper of FIG. 6 is shown, (a) is X3-X3 sectional drawing of FIG. 6, (b) is X4-X4 sectional drawing of FIG. It is a side view of the dynamic damper used for the support structure of the conventional differential apparatus.

Explanation of symbols

8 Front differential 18 Front mounting part 19 Front bracket 22 Rear bracket 223 Mounting part (part of vertical wall)
25, 26, 28 Fastening portion 33 Frame body 331 Substrate portion 332 Strip plate frame portion 34 Rubber block (elastic member)
35 Inertial body 36 Stopper piece e Space in frame g Gap r Elastic bush A Well shaped base frame D, Da Dynamic damper PT Rotation transmission system P1, P2, P3 Fastening point X Front-rear direction Y Vehicle width direction

Claims (3)

In a dynamic damper of a vehicle fixed to a vertical wall portion of a vehicle body constituent member that receives vibration from a vibration source,
The dynamic damper includes a frame having a base fastened to the vertical wall, an inertial body connected to the frame via an elastic member, and disposed in a space in the frame so as to be vertically movable, A vehicle dynamic damper, comprising: a stopper piece that is bent and extended from upper and lower edges and prevents the inertial body from being detached from the space inside the frame. The dynamic damper of the vehicle according to claim 1,
The frame body is a band plate shape that integrally couples a pair of substrate portions that overlap the vertical wall portions and are fastened to each other and the same pair of substrate portions and forms a rectangular frame body space between the vertical wall portions. A frame portion,
The opposing end portions of the inertial body are connected to both inner wall portions of the belt-like frame portion facing each other via an elastic body,
Vehicle vibrations characterized in that upper and lower stopper pieces covering the main parts of the upper and lower openings of the space inside the frame are formed to extend toward the vicinity of the vertical wall at the upper and lower edges of the belt-like frame. Damping device. The dynamic damper of the vehicle according to claim 1 or 2,
A vehicle dynamic damper, wherein the vehicle body component member is a bracket fastened to a propeller shaft input side of a vehicle differential device, and the dynamic damper is fixed to a vertical wall portion of the bracket.

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