CN221049551U - Long rack energy-absorbing structure - Google Patents

Abstract

The utility model relates to a long rack energy absorbing structure, which comprises a long rack, wherein the long rack comprises a tooth-shaped part and an energy absorbing part, the tooth-shaped part is meshed with a motor, and the energy absorbing part is provided with a weakening structure extending along the length of the energy absorbing part so as to deform during collision to provide better safety performance. According to the long rack energy-absorbing structure, the impact force on passengers in the collision process is reduced through the deformation of the energy-absorbing part of the long rack, so that the safety performance is improved.

Description

Long rack energy-absorbing structure

Technical Field

The present utility model relates to vehicle seats, and more particularly to a long rack energy absorbing structure.

Background

CN113212258B discloses a five-bar structure of a seat, in which a motor drives a rear bar through a driving rack, and then drives the rear bar by the rack to lift and lower the seat. The rack needs to have sufficient strength as a main force receiving member. However, during a collision process including a front collision and a rear collision, the impact resistance of the rack is poor, no energy absorbing structure is designed, and the high-strength rack is not friendly to people riding on the rack due to non-absorbable energy deformation, so that the damage to the people is likely to be caused.

Disclosure of utility model

In order to solve the problems of personnel injury and the like in the prior art, the utility model provides a long rack energy absorbing structure.

The long rack energy absorbing structure according to the utility model comprises a long rack, wherein the long rack comprises a tooth-shaped part and an energy absorbing part, wherein the tooth-shaped part is meshed with a motor, and the energy absorbing part is provided with a weakening structure extending along the length of the energy absorbing part so as to deform during collision to provide better safety performance.

Preferably, the weakening structure is an elongated groove.

Preferably, the tooth-shaped portion is hardened by heat treatment to form a hard material region.

Preferably, the heat treatment influence region behind the hard material region is formed as a transition region, and the energy absorption function region continuing to bear behind the transition region is formed as an energy absorption region.

Preferably, the long rack energy absorbing structure further comprises a short rack, wherein the short rack is overlapped and riveted and fixed on the tooth-shaped part of the long rack.

Preferably, one end of the short rack is riveted to the long rack by at least one first rivet, and the other end of the short rack is riveted to the long rack by at least one second rivet.

Preferably, the long rack energy absorbing structure is further pivoted to the wallboard and the rear connecting rod, the long rack is located between the wallboard and the rear connecting rod, one end of the long rack is supported on the wallboard and meshed with the motor, and the other end of the long rack is pivoted to the rear connecting rod.

Preferably, in the event of a frontal collision, the angle between the wall plate and the rear link is increased, and the energy-absorbing portion is stretched and deformed.

Preferably, in the event of a rear collision, the angle between the wall plate and the rear link is reduced, and the energy absorbing portion is shortened in compression deformation.

Preferably, the wall plate is pivotally connected to the rear link by a rear tube.

According to the long rack energy-absorbing structure, the impact force on passengers in the collision process is reduced through the deformation of the energy-absorbing part of the long rack, so that the safety performance is improved.

Drawings

FIG. 1 is a schematic overall structure of a long tine energy absorbing structure according to a first embodiment of the present utility model.

Fig. 2 is a partial top view of fig. 1.

Fig. 3 is a partial enlarged view of fig. 1.

Fig. 4 is a schematic structural view of the long rack structure of fig. 1.

FIG. 5 illustrates a frontal collision process of the long rack energy absorbing structure of FIG. 1.

Fig. 6 is a partial enlarged view of fig. 5.

FIG. 7 illustrates a back-collision process of the long rack energy absorbing structure of FIG. 1.

Fig. 8 is a partial enlarged view of fig. 7.

FIG. 9 is a schematic structural view of a long tine structure of a long tine energy absorbing structure in accordance with a second embodiment of the present utility model.

FIG. 10 is a schematic structural view of a long ribbon structure of a long ribbon energy absorbing structure according to a third embodiment of the present utility model.

Fig. 11 is an exploded view of fig. 10.

Detailed Description

Preferred embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the long rack energy absorbing structure according to the first embodiment of the present utility model includes a panel 5, a rear link 6, a rear pipe 7 and a lifting bracket 8, wherein the lifting bracket 8 is fixedly installed on a vehicle body floor, the bottom end of the rear link 6 is pivoted to the rear end of the lifting bracket 8, and the rear end of the panel 5 is pivoted to the top end of the rear link 6 through the rear pipe 7.

With reference to fig. 1 and 2, the long-toothed strip energy-absorbing structure further comprises a long-toothed strip structure 1 located between the web plate 5 and the rear link 6. As shown in fig. 3, the front end of the long rack structure 1 is supported on the wall plate 5 and engaged with a motor mounted on the wall plate 5, and returns to fig. 1, and the rear end of the long rack structure 1 is pivotally connected to the rear link 6.

As shown in fig. 4, the long rack structure 1 comprises a tooth-shaped portion 11 and an energy absorbing portion 12, wherein the tooth-shaped portion 11 is engaged with the motor, and the energy absorbing portion 12 has an elongated slot 13 extending along its length as shown in fig. 3 for weakening the strength of the energy absorbing portion 12 to deform during a collision to provide better safety performance.

The energy absorption principle is briefly described below.

As shown in fig. 5, in the front collision, the wall plate 5 is used as a driving rod to displace forward along an arrow F1, and the rear connecting rod 6 as a driven rod is pivoted forward along with the driving rod in the stressed state of the seat, but because the forward displacement distance is smaller than the forward displacement distance of the wall plate 5, the included angle between the wall plate 5 and the rear connecting rod 6 is increased, the whole cushion is turned forward along an arrow F2, the energy absorbing part 12 of the long rack structure 1 can be stretched, deformed and elongated, as shown in fig. 6, the impact force on an occupant in the collision process is reduced, and the safety performance is improved.

In the rear collision, as shown in fig. 7, the wall plate 5 is displaced backwards along the arrow F3 as a driving rod in the stressed state of the seat, and the rear connecting rod 6 as a driven rod is pivoted backwards along with the driving rod, but the backward displacement distance is smaller than the backward displacement distance of the wall plate 5, so that the included angle between the wall plate 5 and the rear connecting rod 6 is reduced, the whole cushion is turned backwards along the arrow F4, the energy absorbing part 12 of the long rack structure 1 can be extruded and deformed to be shortened, as shown in fig. 8, the impact force on an occupant in the collision process is reduced, and the safety performance is improved.

As shown in fig. 9, the toothed portion 11 of the long rack energy absorbing structure 10 according to the second embodiment of the present utility model is hardened by heat treatment to form a hard material region 110, a heat treatment affected region behind the hard material region 110 is formed as a transition region 130, and an energy absorbing function is continuously carried behind the transition region 130 to form an energy absorbing portion 120, and the energy absorbing principle thereof is not described herein.

In this embodiment, the long rack structure 10 is a fine-blanked part, and three different functional areas are realized through a local heat treatment process: the energy-absorbing part 120 does not perform any heat treatment, the performance of 42crmo spheroidized material raw materials is kept, and the energy-absorbing function of the rack is realized mainly through the deformation of the energy-absorbing part 120 during collision; the hard material region 110 is a local heat treatment region, has high strength, and ensures that the tooth-shaped part has enough strength; the transition region 130 is a heat treatment transition region, and is a transition region of the rack in which the heat treatment portion is made and in which the heat treatment portion is not made.

In this manner, the long rack structure 10 can have lower cost through local heat treatment, the energy absorbing portion 120 can be finished later, the deformation of the heat treatment is smaller, and the precision is higher.

As shown in fig. 10, a long rack structure 100 of a long rack energy absorbing structure according to a third embodiment of the present utility model includes a long rack 101 and a short rack 102, wherein the short rack 102 is riveted and fixed to a tooth-shaped portion of the long rack 101. In this embodiment, the long rack 101 is a partially heat-treated rack of the second embodiment, and the energy absorption principle thereof is shown in fig. 5 to 8, which are not described herein again, and the short rack 102 is stacked and riveted and fixed in the hard material region 110 of the long rack 101. In the present embodiment, the long rack 101 and the short rack 102 are fixed by one first rivet 103 in front of the tooth-shaped portion and by two second rivets 104 in rear of the tooth-shaped portion. It should be understood that the number of rivets is by way of example only and not limitation. As such, the long rack structure 100 may have a more optimal size design and may have a higher strength at the same spatial size.

In fact, in the development process of the zero gravity framework platform, the FEA calculation of the front collision experiment requires 60KN for the strength of the combination of the lifting motor and the rack. The design strength of the current motor is 55KN, and the FEA strength requirement is not met, so that the core motor needs to be redeveloped. The long rack energy-absorbing structure can reduce the strength requirement to 50KN through an energy-absorbing design, and the combined stress of the lifting motor and the rack is reduced by 20% during collision, so that the strength of the existing motor can meet the requirement, and the motor does not need to be redeveloped.

In addition, when the energy absorption design is not adopted, in order to meet the FEA strength requirement, the width of the rack is larger than 16mm, the width of the pinion of the lifting motor is larger than 17.5mm, and therefore the pinion fine blanking die is required to be redeveloped. According to the long rack energy-absorbing structure, the width of the rear rack can be reduced to 12.5mm through an energy-absorbing design, and the width of a pinion of a lifting motor can also be reduced to 14mm, so that a pinion fine blanking die does not need to be developed again.

In addition, the long rack energy absorption structure can reduce the weight of a rack single piece by 50g, reduce a motor single piece by 6g and reduce a rack fixing bracket by 7g through an energy absorption design. After the energy absorption design is adopted, the energy is absorbed by the rack during collision. The energy transferred to the front/rear links is smaller, the thickness of the rear links is reduced by 0.5mm, the weight is reduced by 26g, the thickness of the front links is reduced by 0.5mm, and the weight is reduced by 25g. The total weight of the framework is reduced by 228g.

In a word, the single piece cost of the rack of the long rack energy absorbing structure is greatly reduced, and a motor, equipment, a fine blanking process and the like are not required to be redeveloped.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and various modifications can be made to the above-described embodiment of the present utility model. All simple, equivalent changes and modifications made in accordance with the claims and the specification of this application fall within the scope of the patent claims. The present utility model is not described in detail in the conventional art.

Claims (10)

1. An energy absorbing structure for a long rack comprising a long rack, wherein the long rack comprises a toothed portion and an energy absorbing portion, wherein the toothed portion is engaged with a motor, and the energy absorbing portion has a weakened structure extending along its length to deform during a collision to provide improved safety performance.

2. The long rack energy absorbing structure of claim 1, wherein the weakening structure is an elongated slot.

3. The long-toothed energy absorbing structure of claim 1, wherein the toothed portion is hardened by heat treatment to form a hard-material region.

4. A long rack energy absorbing structure according to claim 3, wherein the heat treatment affected zone behind the hard material zone is formed as a transition zone and the energy absorbing functional zone continuing to bear behind the transition zone is formed as an energy absorbing zone.

5. The long rack energy absorbing structure of claim 1, further comprising a short rack, wherein the short rack is stacked and riveted to the toothed portion of the long rack.

6. The long-rack energy absorbing structure of claim 5, wherein one end of the short rack is riveted to the long rack by at least one first rivet and the other end of the short rack is riveted to the long rack by at least one second rivet.

7. The long-rack energy-absorbing structure of claim 1, wherein the long-rack energy-absorbing structure is further pivotally connected to the panel and the rear link, the long-rack is located between the panel and the rear link, one end of the long-rack is supported on the panel and engaged with the motor, and the other end of the long-rack is pivotally connected to the rear link.

8. The long rack energy absorbing structure of claim 7, wherein the angle between the panel and the rear link increases during a frontal collision, and the energy absorbing portion stretches out of shape.

9. The long rack energy absorbing structure of claim 7, wherein the angle between the panel and the rear link is reduced during a rear impact, and the energy absorbing portion is shortened by compression deformation.

10. The long rack energy absorbing structure of claim 7, wherein the panel is pivotally connected to the rear link by a rear tube.