Aerodynamic balance bar structure

Abstract

This utility model belongs to the field of automotive parts technology, specifically disclosing a pneumatic balance bar structure, including: a balance bar body and a spring and a gas spring disposed therein, at least part of the gas spring is disposed within the spring, a spring guide sleeve is provided between the gas spring and the spring, and a plurality of spring pieces are provided circumferentially on the outer side of the spring guide sleeve to abut against the inner wall of the spring. During the spring's extension and retraction, this utility model utilizes the elasticity of the spring pieces to reduce the force of the radial sway of the gas spring colliding with the spring, thereby reducing the noise level of abnormal sounds.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a pneumatic balance bar structure. Background Technology

[0002] During vehicle use, it is frequently necessary to open and close the tailgate. Due to the weight of the tailgate, manual operation is extremely difficult. Therefore, electric tailgate systems are commonly used to achieve automatic opening and closing. Electric tailgates mainly employ two types: single-electric strut drive systems and dual-electric strut drive systems. The single-electric strut drive system involves installing an electric strut and a stabilizer bar on each side of the tailgate. The electric strut provides driving support, while the stabilizer bar provides auxiliary support.

[0003] Currently, the most common stabilizer bar structure on the market can be found in the patent filed by the applicant in June 2018, with authorization announcement number CN208347538U. This patent specifically discloses the assembly of a ball joint sleeve for an electric tailgate stabilizer bar. The electric tailgate stabilizer bar structure mainly consists of a fixed joint (ball joint sleeve), a gas spring, a spring, a fixed sleeve (outer sleeve), a sliding sleeve (inner sleeve), and a sliding joint (ball joint sleeve). However, in actual use by customers, the following shortcomings have been found in this structure: during the extension and retraction of the stabilizer bar, due to the relative movement of the gas spring and the spring, the gas spring experiences radial wobbling while moving horizontally. This radial wobbling causes the gas spring to collide with the spring, resulting in abnormal noise. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic balance bar structure that reduces the force of radial swaying of the gas spring and its collision with the spring, which can cause abnormal noise.

[0005] The purpose of this utility model is achieved through such a technical solution, specifically providing a pneumatic balance bar structure, including a balance bar body and a spring and a gas spring disposed therein, at least part of the gas spring is disposed in the spring, a spring guide sleeve is provided between the gas spring and the spring, and a number of spring pieces are provided on the outer circumferential side of the spring guide sleeve to abut against the inner wall of the spring.

[0006] Preferably, the spring guide sleeve includes a contact portion, and multiple grooves are evenly distributed axially on the outer side of the contact portion, with adjacent grooves sharing a common edge parallel to the axis of the spring guide sleeve.

[0007] Preferably, the spring guide sleeve further includes a guide portion, which is connected to one side of the groove tail end by an arc-shaped surface, and the outer diameter of the contact portion is larger than the outer diameter of the guide portion.

[0008] Preferably, multiple sets of spring contacts are provided, evenly spaced on the outer side of the contact portion.

[0009] Preferably, the balance bar body includes a fixed joint, a fixed sleeve, a sliding sleeve, and a sliding joint. The sliding sleeve is fitted inside the fixed sleeve, and its inner wall contacts the outer side of the spring. The two ends of the gas spring are connected to the sliding joint and the fixed sleeve, respectively.

[0010] Preferably, the sliding joint is connected to the sliding sleeve by one of the following methods: laser, ultrasonic, adhesive, or interference fit.

[0011] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0012] By setting a spring piece on the outside of the spring guide sleeve, the spring piece is kept in contact with the inner wall of the spring, which reduces the impact force of the gas spring and the spring guide sleeve on the spring and thus reduces the abnormal noise volume. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a schematic diagram of a pneumatic balance bar structure according to the present invention;

[0015] Figure 2 This is an exploded schematic diagram of a pneumatic balance bar structure.

[0016] Figure 3 This is a schematic diagram of the spring guide sleeve and spring assembly;

[0017] Figure 4 This is a schematic diagram of the spring guide sleeve;

[0018] Figure 5 This is an enlarged view of point A.

[0019] Figure label:

[0020] 1-Stabilizer bar body, 11-Fixed joint, 12-Fixed sleeve, 121-Boss, 13-Sliding sleeve, 14-Sliding joint;

[0021] 2-Spring;

[0022] 3-Spring guide sleeve, 31-Loop, 32-Contact part, 321-Groove, 322-Through groove, 323-Edge, 33-Guide part, 331-Arc-shaped surface;

[0023] 4-Gas spring, 41-Cylinder, 42-Piston rod, 421-Second external thread, 43-Balance guide block; 5-Spring. Detailed Implementation

[0024] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] Please see Figures 1 to 3 The system comprises a balance bar body 1 and a spring 2 and a gas spring 4 disposed therein. At least a portion of the gas spring 4 is disposed within the spring 2. A spring guide sleeve 3 is provided between the gas spring 4 and the spring 2. The outer circumferential surface of the spring guide sleeve 3 is provided with several spring pieces 5 that abut against the inner wall of the spring 2. Specifically, the gas spring 4 includes a cylinder 41, a piston rod 42, and a balance guide block 43. The balance guide block 43 is disposed at one end of the cylinder 41. One end of the piston rod 42 passes through the balance guide block 43 and is connected to the balance bar body 1. The piston rod 42 is partially inserted into the cylinder 41 and moves along the cylinder 41. One end of the cylinder 41 is provided with a first internal thread, and the balance bar body 1 is provided with a first external thread that mates with the first internal thread. The cylinder 41 is fixedly connected to one end of the balance bar body 1 through the threaded engagement. One end of the piston rod 42 is provided with a second external thread 421, and the other end of the balance bar body 1 is provided with a second internal thread that mates with the second external thread 421. The piston rod 42 is fixedly connected to the other end of the balance bar body 1 through the threaded engagement. The balance guide block 43 is installed at one end of the cylinder 41 with an interference fit. During the repeated extension and retraction of the piston rod 42 in the cylinder 41, the balance guide block 43 not only guides the reciprocating motion of the piston rod 42, but also effectively prevents the radial displacement of the gas spring 4. The spring guide sleeve 3 is installed on the outside of the cylinder 41 by adhesive. The balance bar body 1 adopts the balance bar outer body with authorization announcement number CN208347538U. The balance bar body 1 can extend or retract under the action of the gas spring 4.

[0026] This utility model discloses a pneumatic balance bar structure. When the electric tailgate of a car is opened, the piston rod 42 slides outward and applies a thrust to one side of the balance bar body 1 connected to it, pushing the balance bar body 1 to extend outward. During the opening process, the spring 2 extends along with the balance bar body 1, and the spring 2 extends and moves outside the spring guide sleeve 3. When the electric tailgate of the car is closed, the piston rod 42 pulls one side of the balance bar body 1 connected to it to move backward, and causes the spring 2 to shorten along with the shortening of the balance bar body 1. When opening or closing the tailgate of the car, the piston rod 42 moves axially, and at the same time, the gas spring 4 and the spring guide sleeve 3 have a slight radial wobble. When wobble, they deviate towards the spring 2. The spring piece 5 on the deviated side deforms outward and keeps in contact with the inner wall of the spring 2. At the same time, the spring piece 5 on the deviated side is compressed and generates a rebound force, which buffers the impact of the gas spring 4 and the spring guide sleeve 3 on the spring 2. Under the action of the spring piece 5, the gas spring 4 and the spring guide sleeve 3 return to the center position, thereby reducing the impact force of the gas spring 4 and the spring guide sleeve 3 on the spring 2 and reducing the abnormal noise. Adding the spring guide sleeve 3, which increases the thickness of the cylinder 41, helps to reduce the impact of the piston rod 42 movement on the spring 2, and further reduces the abnormal noise caused by the impact force of the gas spring 4 on the spring 2.

[0027] Further, please refer to Figure 4 The spring guide sleeve 3 includes a contact portion 32, with multiple grooves 321 evenly distributed axially on the outer side of the contact portion 32. Adjacent grooves 321 share a common edge 323 parallel to the axis of the spring guide sleeve 3. Specifically, in this application, there are twelve grooves 321. This structure reduces the contact area between the spring 2 and the spring guide sleeve 3 during movement by using the contact surface between the edge 323 and the inner wall of the spring 2 as the line, thereby reducing resistance and effectively reducing jamming or abnormal noise. On the other hand, before assembly, lubricating oil is applied to the outer side of the spring guide sleeve 3, and the grooves 321 form an oil storage space, which helps to increase the lubrication between the spring 2 and the spring guide sleeve 3 and reduce the abnormal noise generated by the spring 2 extending and retracting.

[0028] Further, please refer to Figure 3 and Figure 4 The spring guide sleeve 3 also includes a guide portion 33, which is connected to one side of the end of the groove 321 by an arc-shaped surface 331. The outer diameter of the contact portion 32 is larger than the outer diameter of the guide portion 33. Specifically, the guide portion 33 and the contact portion 32 are integrally formed, and the guide portion 33 and the contact portion 32 form an arc-shaped inclined bevel. When the electric tailgate of the car is closed or opened, the spring 2 extends or retracts, and the spring 2 will not make a step-like hard contact with the spring guide sleeve 3, which can effectively avoid abnormal noise from the contact between the spring 2 and the gas spring 4.

[0029] Further, please refer to Figures 3 to 5 Multiple sets of spring pieces 5 are evenly spaced on the outer side of the contact portion 32. Specifically, a through groove 322 is provided along the center of the common edge 323, and the spring piece 5 is disposed in the through groove 322, with one end integrally formed with the spring guide sleeve 3 and the other end suspended. In Embodiment 1, this application provides eight spring pieces 5, divided into two groups. One group is disposed at the front of the contact portion 32 and evenly spaced along the circumference of the contact portion 32, and the other group is disposed at the rear of the contact portion 32 and evenly spaced along the circumference of the contact portion 32. In Embodiment 2, this application provides eight spring pieces 5, evenly spaced on the outer side of the contact portion 32, with three adjacent spring pieces 5 forming an isosceles triangle. In Embodiment 3, this application provides eight spring pieces 5, spirally arranged along the outer axial direction of the spring guide sleeve 3. With the above structure, the spring piece 5 can stably contact the inner wall of the spring 2 even when the spring guide sleeve 3 and the gas spring 4 are offset in any radial direction, thereby reducing the abnormal noise generated by the gas spring 4, the spring guide sleeve 3, and the spring 2.

[0030] Further, please refer to Figure 1 and Figure 2The stabilizer bar body 1 includes a fixed joint 11, a fixed sleeve 12, a sliding sleeve 13, and a sliding joint 14. The sliding sleeve 13 is partially fitted inside the fixed sleeve 12, with its inner wall contacting the outer side of the spring 2. Both ends of the gas spring 4 are connected to the sliding joint 14 and the fixed sleeve 12, respectively. Specifically, the gas spring 4 is positioned on the central axis of the fixed sleeve 12 and the sliding sleeve 13. The fixed joint 11 is fixedly installed at the end of the fixed sleeve 12 away from the sliding sleeve 13. Preferably, the fixed joint 11 is connected via laser / ultrasound / adhesive / interference fitting, etc., and is connected to the vehicle body. The sliding joint 14 is fixedly installed at the end of the sliding sleeve 13 away from the fixed sleeve 12. Preferably, the sliding joint 14 is connected via laser / ultrasound / adhesive / interference fitting, etc., and is connected to the vehicle tailgate. The sliding joint 14 has a second internal thread that mates with the external thread of the piston rod 42. The piston rod 42 is fixedly connected to the sliding joint 14 via the threaded engagement. One end of the fixed sleeve 12 has a boss 121, and a first external thread is provided on the boss 121, through which the gas spring 4 is threadedly connected to the fixed sleeve 12. Using this structure, the length of the gas spring 4 and spring 2 can be effectively shortened while maintaining the overall length of the balance bar, replacing the conventional gas spring 4 and spring 2 which run through the entire balance bar body, thus reducing material costs. The shortened gas spring 4 and spring 2 reduce the impact of the piston rod 42's movement on the cylinder 41, and the deformation caused by the extension and contraction of spring 2 helps reduce the noise generated by the gas spring 4, spring guide sleeve 3, and spring 2. The spring guide sleeve 3 also includes a collar 31, located at the end of the spring guide sleeve 3 near the boss 121, and the collar 31 is integrally formed with the contact portion 32. The spring 2 is assembled in the cavity between the fixed sleeve 12 and the sliding sleeve 13, with one end of the spring 2 pressing against the collar 31 and the other end pressing against the boss surface of the sliding sleeve.

[0031] This utility model discloses a pneumatic balance bar structure. A spring guide sleeve 3 with a spring piece 5 on its outer side ensures that when the electric tailgate of a car opens or closes, the spring piece 5 remains in contact with the inner wall of the spring 2, buffering the impact of the gas spring 4 and the spring guide sleeve 3 on the spring. Under the action of the spring piece 5, the gas spring 4 and the spring guide sleeve 3 return to their central position, reducing the direct impact force of the spring guide sleeve 3 on the inner wall of the spring 2, thereby reducing the noise generated by the gas spring 4, the spring guide sleeve 3, and the spring 2. Increasing the spring guide sleeve 3 increases the thickness of the cylinder 41, which helps reduce the impact of the piston rod 42's movement on the spring 2. The contact part 32 has an oil storage groove 321, which helps increase the lubrication between the spring 2 and the spring guide sleeve 3, further reducing the noise generated by the spring during extension and retraction. A boss 121 at one end of the fixed sleeve 12 shortens the length of the gas spring 4 and the spring 2, reducing material costs.

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A pneumatic balance bar structure, comprising: The balance bar body (1) and the spring (2) and gas spring (4) disposed therein, at least part of the gas spring (4) is disposed in the spring (2), characterized in that a spring guide sleeve (3) is provided between the gas spring (4) and the spring (2), and a plurality of spring pieces (5) are provided on the outer circumferential side of the spring guide sleeve (3) to abut against the inner wall of the spring (2).

2. The pneumatic balance bar structure according to claim 1, characterized in that, The spring guide sleeve (3) includes a contact portion (32), and multiple grooves (321) are evenly distributed axially on the outer side of the contact portion (32). Adjacent grooves (321) share a common edge (323) that is parallel to the axis of the spring guide sleeve (3).

3. The pneumatic balance bar structure according to claim 2, characterized in that, The spring guide sleeve (3) also includes a guide part (33), which is connected to one side of the tail end of the groove (321) by an arc surface (331), and the outer diameter of the contact part (32) is larger than the outer diameter of the guide part (33).

4. The pneumatic balance bar structure according to claim 2 or 3, characterized in that, Multiple sets of spring clips (5) are evenly spaced on the outside of the contact part (32).

5. The pneumatic balance bar structure according to any one of claims 1 to 3, characterized in that, The balance bar body (1) includes a fixed joint (11), a fixed sleeve (12), a sliding sleeve (13) and a sliding joint (14). The sliding sleeve (13) is partially fitted inside the fixed sleeve (12), and its inner wall contacts the outer side of the spring (2). The two ends of the gas spring (4) are connected to the sliding joint (14) and the fixed sleeve (12) respectively.

6. The pneumatic balance bar structure according to claim 4, characterized in that, The balance bar body (1) includes a fixed joint (11), a fixed sleeve (12), a sliding sleeve (13) and a sliding joint (14). The sliding sleeve (13) is partially fitted inside the fixed sleeve (12), and its inner wall contacts the outer side of the spring (2). The two ends of the gas spring (4) are connected to the sliding joint (14) and the fixed sleeve (12) respectively.

7. The pneumatic balance bar structure according to claim 5, characterized in that, The sliding joint (14) is connected to the sliding sleeve (13) by one of the following methods: laser, ultrasonic, adhesive, or interference fit.

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