Crumple structure of long-distance electric adjusting steering column

Abstract

The utility model relates to the technical field of steering columns, in particular to a crumple structure of a long-distance electric adjusting steering column, which comprises a fixing support, an energy absorption belt, a crumple rivet, an energy absorption belt rivet, a fixing pin, a connecting bush, a lead screw nut small assembly and an upper column tube. Compared with the prior art, the fixing support and the energy absorption belt are installed outside the upper column pipe through the crumple rivets and the energy absorption belt rivets respectively, the number of parts is reduced, the assembly space is saved, meanwhile, crumple peak force is provided through shear fracture of the crumple rivets, after the crumple rivets are fractured, the energy absorption belt is curled and deformed along the fixing pins and the connecting linings, and therefore the energy absorption effect is improved. Crumple retention force is provided, so that crumple is more stable; the device has the advantages of being simple in structure, safe, reliable, low in manufacturing cost, high in assembling efficiency and not prone to producing defective products.

Description

Technical Field

[0001] The utility model relates to the technical field of steering columns, and particularly relates to a collapse structure of a long-distance electric adjustable steering column. Background Art

[0002] The steering column is an important component in the vehicle steering system. During normal operation, it is mainly used to connect the steering wheel and the steering gear, receive the torque and rotational speed from the steering wheel, and transmit them to the steering gear. When a vehicle collision occurs, the steering column also needs to play a safety protection function, and the collapse energy absorption mechanism is the main mechanism for the steering column to play a safety protection function.

[0003] However, due to its structural design, the traditional collapse energy absorption device requires more parts to complete installation and fixation, occupies a large space, and affects the overall vehicle layout. In addition, the traditional collapse energy absorption device also has the problem of large fluctuations in the collapse force.

[0004] Therefore, it is necessary to design a collapse structure of a long-distance electric adjustable steering column to improve the stability of the collapse force while saving the assembly space. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a collapse structure of a long-distance electric adjustable steering column to improve the stability of the collapse force while saving the assembly space.

[0006] To achieve the above purpose, the utility model is a collapse structure of a long-distance electric adjustable steering column, including a fixed bracket, a collapse belt, collapse rivets, collapse belt rivets, a fixed pin, a connecting bushing, a lead screw nut sub-assembly, and an upper column tube. The fixed bracket and the upper column tube are connected by collapse rivets. A fixed pin is installed at one end of the fixed bracket close to the steering wheel, and a connecting bushing is installed outside the fixed pin. The tail of the collapse belt is located inside the fixed bracket, the middle part of the collapse belt bypasses the connecting bushing, and the head of the collapse belt protrudes from one end of the fixed bracket away from the steering wheel and is fixed to the upper column tube by a collapse belt rivet. The fixed bracket is fixed to the lead screw nut sub-assembly.

[0007] There are two collapse rivets and one collapse belt rivet.

[0008] The strength of the collapse belt rivet is greater than that of the collapse rivet.

[0009] An interference fit exists between the installation holes of the fixed pin and the fixed bracket, and between the fixed pin and the connecting bushing.

[0010] The middle part of the collapse belt is attached to the outer arc surface of the connecting bushing.

[0011] The described lead screw nut subassembly includes a lead screw nut body, a lead screw, and a motor. The lead screw nut is sleeved outside the lead screw, and the lead screw is connected to the shaft of the motor.

[0012] The described lead screw nut body and the fixed bracket are connected by a shield bracket. The shield bracket is wrapped outside the lead screw nut body. One end of the convex block of the shield bracket is embedded in the groove on the side of the fixed bracket, and the other end of the shield bracket is fixed to the fixed bracket by a fastener. There is a convex platform on each side of the lead screw nut body, and the two convex platforms are embedded in the installation grooves of the fixed bracket and the shield bracket.

[0013] The described shield bracket is in an L shape.

[0014] The described upper column tube is sleeved outside the steering shaft. The upper end of the steering shaft protrudes from the end of the upper column tube and is connected to the steering wheel.

[0015] Compared with the prior art, the fixed bracket and the energy absorption belt are respectively installed outside the upper column tube by means of collapsible rivets and energy absorption belt rivets. While reducing parts and saving assembly space, the shear fracture of the collapsible rivets is used to provide the peak force of collapse. After the collapsible rivets break, the energy absorption belt curls and deforms along the fixed pin and the connecting bushing to provide the holding force of collapse, making the collapse more stable. The utility model has the advantages of simple structure, safety and reliability, low manufacturing cost, high assembly efficiency, and not easy to produce defective products. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the utility model.

[0017] Figure 2 It is a sectional view of the utility model with the upper column tube removed.

[0018] Figure 3 It is an exploded view of the utility model with the upper column tube removed.

[0019] Figure 4 It is a schematic curve diagram of the collapse peak force and the collapse holding force of the utility model. Detailed Embodiments

[0020] Now, the utility model will be further described in conjunction with the drawings.

[0021] See Figure 1, the utility model is a collapsible structure of a long-distance electrically adjustable steering column, which includes a fixed bracket, an energy absorption belt, a collapsible rivet, an energy absorption belt rivet, a fixed pin, a connecting bushing, a lead screw nut sub-assembly, and an upper column tube. The fixed bracket 1 and the upper column tube 8 are connected by a collapsible rivet 3. A fixed pin 5 is installed at one end of the fixed bracket 1 close to the steering wheel. A connecting bushing 6 is installed outside the fixed pin 5. The tail of the energy absorption belt 2 is located inside the fixed bracket 1. The middle part of the energy absorption belt 2 bypasses the connecting bushing 6. The head of the energy absorption belt 2 protrudes from one end of the fixed bracket 1 away from the steering wheel and is fixed to the upper column tube 8 by an energy absorption belt rivet 4. The fixed bracket 1 is fixed to the lead screw nut sub-assembly 7.

[0022] Preferably, there are two collapsible rivets 3 and one energy absorption belt rivet 4.

[0023] The strength of the energy absorption belt rivet 4 is greater than that of the collapsible rivet 3 to ensure that when the collapsible rivet 3 breaks, the energy absorption belt rivet 4 still maintains the connection.

[0024] The fixed bracket 1 and the energy absorption belt 2 are connected through the connecting bushing 6, reducing the number of parts, the internal space of the upper column tube 8, and the assembly cost.

[0025] There is an interference fit between the installation hole of the fixed pin 5 and the fixed bracket 1, and between the fixed pin 5 and the connecting bushing 6. In this way, the energy absorption belt 2 curls and deforms along the arc surface of the fixed pin 5 and the connecting bushing 6, thereby providing a stable collapsing force.

[0026] The middle part of the energy absorption belt 2 adheres to the outer arc surface of the connecting bushing 6 to ensure that the deformation force of the energy absorption belt 2 does not fluctuate during energy absorption, so that the collapsing holding force is more stable.

[0027] See Figure 2 , the lead screw nut sub-assembly 7 includes a lead screw nut body 71, a lead screw 72, and a motor 73. The lead screw nut body 71 is sleeved outside the lead screw 72, and the lead screw 72 is connected to the shaft of the motor 73.

[0028] See Figure 3 , a shield bracket 9 is used to connect between the lead screw nut body 71 and the fixed bracket 1. The shield bracket 9 covers the outside of the lead screw nut body 71. One end of the convex block of the shield bracket 9 is embedded in the groove 11 on the side of the fixed bracket 1. The other end of the shield bracket 9 is fixed to the fixed bracket 1 by a fastener 10. There is a convex platform 711 on each side of the lead screw nut body 71, and the two convex platforms 711 are embedded in the installation grooves of the fixed bracket 1 and the shield bracket 9. The shield bracket 9 is L-shaped.

[0029] The upper column tube 8 is sleeved outside the steering shaft 81. The upper end of the steering shaft 81 protrudes from the end of the upper column tube 8 and is connected to the steering wheel.

[0030] When the vehicle of the present utility model is impacted, the screw-nut subassembly 7 remains fixed. The steering shaft 81 is subjected to a downward impact force transmitted from the steering wheel. When the impact force is greater than the peak force of the collapse rivet 3, the collapse rivet 3 shears and breaks, and provides a collapse peak force a, as Figure 4 shown. Then, the upper column tube 8 will continue to collapse in the same direction, driving the energy-absorbing belt 2 to move downward. The fixing bracket 1 is disengaged from the upper column tube 8 and is pulled in place by the screw-nut subassembly 7. The energy-absorbing belt 2 and the connecting bushing 6 have relative movement. The tail of the energy-absorbing belt 2 is curled and deformed through the arc surface of the connecting bushing 6 to provide a subsequent collapse holding force b, as Figure 4 shown. The present utility model provides collapse and energy absorption during vehicle collision to ensure the safety of the driver.

[0031] In the present utility model, the fixing bracket and the energy-absorbing belt are respectively installed outside the upper column tube by using a collapse rivet and an energy-absorbing belt rivet. While reducing parts and saving assembly space, the collapse peak force is provided by the shear fracture of the collapse rivet. After the collapse rivet breaks, the energy-absorbing belt is curled and deformed along the fixing pin and the connecting bushing to provide the collapse holding force, making the collapse more stable. The present utility model has the advantages of simple structure, safety and reliability, low manufacturing cost, high assembly efficiency, and not easily generating defective products.

Claims

1. A collapsible structure for a long-distance electrically adjustable steering column, comprising a fixed bracket, an energy-absorbing belt, a collapsible rivet, an energy-absorbing belt rivet, a fixed pin, a connecting bushing, a lead screw nut sub-assembly, and an upper column tube, characterized in that: The fixed bracket (1) is connected to the upper column tube (8) by means of a collapsible rivet (3). A fixing pin (5) is installed at one end of the fixed bracket (1) close to the steering wheel. A connecting bushing (6) is installed outside the fixing pin (5). The tail of the energy-absorbing belt (2) is located inside the fixed bracket (1). The middle part of the energy-absorbing belt (2) bypasses the connecting bushing (6). The head of the energy-absorbing belt (2) protrudes from one end of the fixed bracket (1) away from the steering wheel and is fixed to the upper column tube (8) by means of an energy-absorbing belt rivet (4). The fixed bracket (1) is fixed to the lead screw nut subassembly (7).

2. The collapse structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: There are two of the said collapsible rivets (3) and one energy-absorbing belt rivet (4).

3. The collapse structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: The strength of the said energy-absorbing belt rivet (4) is greater than that of the collapsible rivet (3).

4. The collapsible structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: There is an interference fit between the installation hole of the said fixing pin (5) and the fixed bracket (1), and also between the fixing pin (5) and the connecting bushing (6).

5. The collapsible structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: The middle part of the said energy-absorbing belt (2) is attached to the outside of the arc surface of the connecting bushing (6).

6. The collapsible structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: The said lead screw nut subassembly (7) includes a lead screw nut body (71), a lead screw (72), and a motor (73). The lead screw nut body (71) is sleeved outside the lead screw (72), and the lead screw (72) is connected to the shaft of the motor (73).

7. The collapsing structure of a long-distance electrically adjustable steering column according to claim 6, characterized in that: The said lead screw nut body (71) is connected to the fixed bracket (1) by means of a shield bracket (9). The shield bracket (9) covers the outside of the lead screw nut body (71). One end of the convex block of the shield bracket (9) is embedded in the groove (11) on the side of the fixed bracket (1). The other end of the shield bracket (9) is fixed to the fixed bracket (1) by means of a fastener (10). There is a convex platform (711) on each side of the lead screw nut body (71), and the two convex platforms (711) are embedded in the installation grooves of the fixed bracket (1) and the shield bracket (9).

8. The collapsible structure of a long-distance electrically adjustable steering column according to claim 7, wherein: The said shield bracket (9) is in an L shape.

9. The collapsible structure of a long-distance electrically adjustable steering column according to claim 1, characterized in that: The said upper column tube (8) is sleeved outside the steering shaft (81). The upper end of the steering shaft (81) protrudes from the end of the upper column tube (8) and is connected to the steering wheel.

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