A balance bar

Abstract

The present invention relates to the technical field of components for balancing an opening and closing system, and in particular to a balance bar, comprising a gas spring body, the gas spring body comprising a pressure tube, the pressure tube having a built-in piston, the piston being connected to a piston rod, the pressure tube being packaged by a sealing unit, the right end of the gas spring body being sleeved with an inner sleeve, the left end of the gas spring body being sleeved with an outer sleeve, the outer sleeve being fixedly connected to the left end of the pressure tube and covering the outside of the inner sleeve, the inner sleeve being telescoped in a space formed by the outer sleeve and the pressure tube, the end of the piston rod being connected to a ball socket structure one, the ball socket structure one being connected to a port of the inner sleeve, the end of the outer sleeve being connected to a ball socket structure two, the mechanical flocking spring being removed from the pneumatic balance bar, the cost of the balance bar being greatly reduced, and at the same time filling the market gap of a solution for an electric and manual automobile tailgate opening and closing system that maintains the original functions unchanged but achieves significant cost reduction.

Description

Technical Field

[0001] The invention relates to the technical field of components for balancing an opening and closing system, in particular to a balancing rod. Background Art

[0002] The car tailgate opening and closing system is generally divided into two types: electric and manual. The electric car tailgate opening and closing system can be divided into the following two configuration schemes: one is to install two electric struts (PR, a product that uses a motor to drive a lead screw actuator to extend and compress) on the left and right sides of the tailgate, which is PR + PR; the other is to install an electric strut (PR) and a pneumatic balance strut with a mechanical flocking spring (FEBI, a product with the appearance of an electric strut, with traditional gas springs and mechanical flocking springs inside), which is PR + FEBI; the traditional pneumatic balance rod with mechanical flocking springs uses mechanical springs to support the inner and outer sleeves through the elasticity of the mechanical springs, which can obtain a larger product force range, but the cost is greatly increased. The general configuration scheme of the manual car tailgate opening and closing system is to install two gas springs (GS) on the left and right sides, which is GS + GS. The cost of both the electric strut PR and the pneumatic balance strut FEBI with mechanical flocking spring is very high, and the ordinary double-sided gas spring (GS + GS) cannot meet the force required for opening and closing the car tailgate, and is not sufficient in terms of lateral force bearing and specific vehicle design requirements. Summary of the invention

[0003] In order to overcome the shortcomings of the existing automobile tailgate opening and closing system, the present invention provides a balancing rod. The balancing rod involved in the present application is mainly designed for automobile tailgate opening and closing systems, but can also be used as a balancing rod in other industrial fields to play the role of support, vibration reduction, etc.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a balance rod, including a gas spring body, the gas spring body including a pressure tube, a piston is arranged in the pressure tube, the piston is connected to a piston rod, the pressure tube is packaged at one end of the piston rod by a sealing unit, the right end of the gas spring body is sleeved with an inner sleeve, the left end of the gas spring body is sleeved with an outer sleeve, the outer sleeve is fixedly connected to the left end of the pressure tube and covered on the outside of the inner sleeve, the inner sleeve is telescoped in the space formed by the outer sleeve and the pressure tube, the end of the piston rod is fixedly connected to a ball socket structure one, the ball socket structure one is fixedly connected to the port of the inner sleeve, and the end of the outer sleeve is fixedly connected to a ball socket structure two.

[0005] According to another embodiment of the present invention, the ball and socket structure 1 is snap-connected to the inner sleeve port, and the inner wall of the inner sleeve is provided with a structure that limits the further inward movement of the ball and socket structure 1. The snap-connection facilitates the assembly of the ball and socket structure 1 and the inner sleeve port, and at the same time, the limiting structure provided on the inner sleeve can achieve axial limiting.

[0006] According to another embodiment of the present invention, it further includes that a snap-fit ​​structure is arranged at the port of the inner sleeve, a limiting structure is arranged on the inner wall of the inner sleeve, and the connecting portion of the ball and socket structure one is a secondary boss structure, including boss one and boss two, and the boss two is assembled between the snap-fit ​​structure and the limiting structure.

[0007] According to another embodiment of the present invention, it further includes that the buckle structure is at least three groups of buckles evenly distributed around the circumference, the limiting structure is at least three groups of inner bosses evenly distributed around the circumference, and the number of the buckles and the inner bosses is the same and they are staggered.

[0008] According to another embodiment of the present invention, further comprising: a strip groove is provided between adjacent said buckles and said inner bosses, the strip groove provides space for lateral deformation of the inner sleeve, thereby allowing the ball and socket structure to enter the inner sleeve with a suitable assembly force.

[0009] According to another embodiment of the present invention, the left end of the inner sleeve is an elastic gap-eliminating structure adapted to the outer sleeve, the left inner wall of the inner sleeve is provided with a latent snap-in structure adapted to the pressure pipe, and the right outer wall of the inner sleeve is provided with a gap-eliminating structure adapted to the outer sleeve.

[0010] According to another embodiment of the present invention, the elastic gap-eliminating structure further comprises an annular step and axial strip grooves uniformly distributed on the tube wall, and the outer diameter of the annular step is larger than the inner diameter of the outer sleeve. The axial strip grooves uniformly distributed on the circumference provide deformation space for the elastic gap-eliminating structure, which facilitates the inner sleeve to be installed in the outer sleeve. When the two are assembled, they will automatically reset and form a tight fit. In addition, during the compression or extension of the balance bar, the avoidance of the elastic gap-eliminating structure will not hinder the mutual movement of the inner and outer sleeves.

[0011] According to another embodiment of the present invention, the bottom edge of the latent buckle structure is provided with a transition fillet, which ensures injection molding and reduces friction between the latent buckle structure and the spray coating on the outer side of the pressure pipe to reduce the risk of rust.

[0012] According to another embodiment of the present invention, the anti-backlash structure is arc-shaped protrusions uniformly distributed around the circumference, and the enveloping diameter of the arc-shaped protrusions is larger than the inner diameter of the outer sleeve.

[0013] According to another embodiment of the present invention, the outer wall of the inner sleeve is provided with reinforcing ribs evenly distributed around the circumference. Since the inner sleeve has a thinner wall, the reinforcing ribs can increase the strength of the inner sleeve and ensure the strength and bearing capacity of the balance bar. The cross section of the reinforcing ribs can be semicircular or triangular.

[0014] The beneficial effect of the present invention is that, compared with the traditional common gas spring, a larger force range can be provided by using the balance bar without built-in spring (S-FEBI) and the balance bar with built-in spring (FEBI) in combination and distributing them on both sides; at the same time, this configuration can compensate for the force attenuation caused by temperature changes on the traditional common gas spring; in addition, multiple anti-gap structures, combined with the increased balance bar diameter, can improve the problem of lateral force bearing difference and meet the needs of tailgate opening and closing; in addition, the gas spring body is packaged to ensure the service life of the balance bar and improve the appearance of the balance bar. A series of structural designs are carried out for the opening and closing products of automobile tailgates, and the mechanical flocking springs in the pneumatic balance struts (FEBI) with mechanical flocking springs are removed, that is, the balance bar without flocking springs (S-FEBI), which greatly reduces the cost of the balance bar and fills the market gap of the electric and manual solutions for automobile tailgate opening and closing systems that maintain the original functions unchanged but achieve significant cost reduction. For high-end models, the original electric tailgate configuration: electric strut (PR) + electric strut (PR) or electric strut (PR) + electric strut (PR) can be replaced by electric strut (PR) + S-FEBI; for models with through-type taillights and manual opening and closing tailgate, two traditional gas springs are not enough to provide full support, and a pneumatic balance strut (FEBI) with mechanical flocking spring + a balance bar without flocking spring (S-FEBI) is used instead, which fully utilizes the greater force of the mechanical flocking spring on one side and the more cost-effective balance bar without flocking spring on the other side to create a manual tailgate opening and closing configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is the structural front view of the inner casing;

[0018] Figure 3 It is a structural cross-sectional view of the inner casing;

[0019] Figure 4 It is a three-dimensional schematic diagram of the structure of the inner casing;

[0020] Figure 5 It is a schematic diagram of the structure of the gas spring body;

[0021] Figure 6 1 is a schematic diagram of the structure of a ball and socket structure;

[0022] Figure 7 It is a schematic diagram of the stretched state of the present invention;

[0023] Figure 8 It is a schematic diagram of the compressed state of the present invention.

[0024] In the figure, 1, gas spring body, 2, pressure tube, 3, piston, 4, piston rod, 5, sealing unit, 6, inner sleeve, 6-1, buckle structure, 6-2, limit structure, 6-3, elastic anti-backlash structure, 6-3-1, annular step, 6-3-2, axial strip groove, 6-4, latent buckle structure, 6-5, anti-backlash structure, 7, outer sleeve, 8, ball and socket structure one, 8-1, boss one, 8-2, boss two, 9, ball and socket structure two, 10, strip groove, 11, reinforcing rib. DETAILED DESCRIPTION

[0025] like Figures 1 to 8 It is a structural schematic diagram of the present invention, a balance rod, comprising a gas spring body 1, the gas spring body 1 comprising a pressure tube 2, a piston 3 is arranged in the pressure tube 2, the piston 3 is connected to a piston rod 4, the pressure tube 2 is packaged at one end of the piston rod 4 by a sealing unit 5, the right end of the gas spring body 1 is sleeved with an inner sleeve 6, the left end of the gas spring body 1 is sleeved with an outer sleeve 7, the outer sleeve 7 is fixedly connected to the left end of the pressure tube 2 and covered on the outside of the inner sleeve 6, the inner sleeve 6 is telescoped in the space formed by the outer sleeve 7 and the pressure tube 2, the end of the piston rod 4 is fixedly connected to a ball and socket structure 8, the ball and socket structure 8 is fixedly connected to the end of the inner sleeve 6, and the end of the outer sleeve 7 is fixedly connected to a ball and socket structure 9.

[0026] Specifically, the outer sleeve 7 is fixedly connected to the gas spring body 1, the inner sleeve 6 is indirectly connected to the end of the piston rod 4, the piston rod 4 and the inner sleeve 6 are synchronously extended and retracted, and the inner sleeve 6 is extended and retracted in the outer sleeve 7, which can improve the problem of poor lateral force bearing of the traditional gas spring; at the same time, the diameter of the balance bar is increased, and a larger force range can be obtained to meet the needs of tailgate opening and closing; in addition, the gas spring body 1 is packaged to ensure the service life of the balance bar and improve the appearance of the balance bar. This application conducts a series of structural designs for automobile tailgate opening and closing products, removes the mechanical flocking spring from the pneumatic balance strut (FEBI) with mechanical flocking spring, that is, a balance bar without flocking spring (S-FEBI), which greatly reduces the cost of the balance bar, and fills the market gap of the electric and manual automobile tailgate opening and closing system to maintain the original functions but achieve significant cost reduction. For high-end models, the original electric tailgate configuration: electric strut (PR) + electric strut (PR) or electric strut (PR) + electric strut (PR) can be replaced by electric strut (PR) + S-FEBI; for models with through-type taillights and manual opening and closing tailgate, two traditional gas springs are not enough to provide full support, and a pneumatic balance strut (FEBI) with mechanical flocking spring + a balance bar without flocking spring (S-FEBI) is used instead, which fully utilizes the greater force of the mechanical flocking spring on one side and the more cost-effective balance bar without flocking spring on the other side to create a manual tailgate opening and closing configuration.

[0027] In the present application, a screw is welded at the left end of the pressure tube, and after the screw passes through the round hole on the left end face of the outer sleeve 7, a metal gasket is put on, and then threadedly connected with the ball and socket structure 2 9. The metal gasket can prevent the left end face of the outer sleeve 7 from being crushed during assembly.

[0028] It is worth mentioning that when the ball-and-socket structure 8 is assembled, the piston rod 4 is pulled out, and the ball-and-socket structure 8 is first fixedly connected to the end of the piston rod 4, for example, an external thread is provided at the end of the piston rod 4, and a threaded hole is provided at the connection part of the ball-and-socket structure 8, and the two are fixedly connected by threads. Thereafter, the ball-and-socket structure 8 is fixedly connected to the end of the inner sleeve 6.

[0029] According to another embodiment of the present invention, the ball and socket structure 8 is snap-connected with the end of the inner sleeve 6, and the inner wall of the inner sleeve 6 is provided with a structure that limits the further inward movement of the ball and socket structure 8. The snap-connection facilitates the assembly of the ball and socket structure 8 with the end of the inner sleeve 6, and at the same time, the limiting structure provided on the inner sleeve 6 can limit the further inward movement of the ball and socket structure 8, thereby achieving axial limiting.

[0030] According to another embodiment of the present invention, it further includes that a snap-fit ​​structure 6-1 is provided at the port of the inner sleeve 6, a limiting structure 6-2 is provided on the inner wall of the inner sleeve 6, and the connecting portion of the ball and socket structure 8 is a secondary boss structure, including a boss 1 8-1 and a boss 2 8-2, and the boss 2 8-2 is assembled between the snap-fit ​​structure 6-1 and the limiting structure 6-2.

[0031] During assembly, the second boss 8 - 2 passes over the buckle structure 6 - 1 and is thus confined between the buckle structure 6 - 1 and the limiting structure 6 - 2 .

[0032] Preferably, the boss 8-2 is provided with an assembly chamfer, and the angle between the assembly chamfer and the axis is greater than the angle of the inclined surface section of the snap structure 6-1, which can ensure that the ball socket structure 8 is in line-to-surface contact rather than surface-to-surface contact when snap-fitting with the inner sleeve 6, thereby reducing the assembly force.

[0033] Preferably, a drainage hole is provided at the boss 8 - 1 to prevent water from being retained in the pipe and causing the gas spring body 1 to rust.

[0034] According to another embodiment of the present invention, the buckle structure 6-1 is at least three groups of buckles evenly distributed around the circumference, the limiting structure 6-2 is at least three groups of inner bosses evenly distributed around the circumference, the buckles and inner bosses are the same in number and are staggered. The staggered arrangement can ensure balanced force.

[0035] According to another embodiment of the present invention, further comprising: a strip groove 10 is opened between adjacent said buckles and said inner bosses, and the strip groove 10 provides space for lateral deformation of the inner sleeve 6, thereby allowing the ball and socket structure 8 to enter the inner sleeve 6 with a suitable assembly force.

[0036] According to another embodiment of the present invention, it further includes that the left end of the inner sleeve 6 is an elastic gap-eliminating structure 6-3 adapted to the outer sleeve 7, the left inner wall of the inner sleeve 6 is provided with a latent snap-in structure 6-4 adapted to the pressure pipe 2, and the right outer wall of the inner sleeve 6 is provided with a gap-eliminating structure 6-5 adapted to the outer sleeve 7.

[0037] During the stretching process of the balance bar, the gap elimination structure 6-5 is outside the outer sleeve 7 and does not work at this time. The elastic gap elimination structure 6-3 is adapted to the outer sleeve 7 and is pressed against the inner wall of the outer sleeve 7. During the stretching process, the two can be in close contact to avoid lateral shaking and eliminate noise. In addition, the elastic gap elimination structure 6-3 is slightly deformed when the inner and outer sleeves are assembled, so that the inner sleeve 6 can be installed into the outer sleeve 7. After the assembly is completed, the elastic gap elimination structure 6-3 will automatically reset to make the inner and outer sleeves form a tight fit; and the latent buckle structure 6-4 can eliminate the gap between the inner sleeve 6 and the pressure pipe 2, thereby avoiding lateral shaking and ensuring smooth and effective movement.

[0038] During the compression of the balance tube, the anti-backlash structure 6-5 is inside the outer sleeve 7. At this time, the anti-backlash structure 6-5 will also work, and under the condition that the inner sleeve 6 forms a deformation deflection, it can ensure the tight fit between the inner sleeve 6 and the outer sleeve 7. Since the balance bar is basically not subjected to force during the compression process, the anti-backlash structure 6-5 does not need to be set to be elastic, and the requirements for the anti-backlash structure 6-5 are lower than those for the aforementioned elastic anti-backlash structure 6-3.

[0039] According to another embodiment of the present invention, the elastic gap-eliminating structure 6-3 further comprises an annular step 6-3-1 and axial strip grooves 6-3-2 evenly distributed on the tube wall, and the outer diameter of the annular step 6-3-1 is larger than the inner diameter of the outer sleeve 7. The axial strip grooves 6-3-2 evenly distributed on the tube wall provide deformation space for the elastic gap-eliminating structure 6-3, so that the inner sleeve 6 can be easily inserted into the outer sleeve 7. When the two are assembled, they will automatically reset and form a tight fit. In addition, during the compression or extension of the balance bar, the avoidance of the elastic gap-eliminating structure 6-3 will not hinder the mutual movement of the inner and outer sleeves.

[0040] According to another embodiment of the present invention, the bottom edge of the latent buckle structure 6-4 is provided with a transition fillet, which ensures injection molding and reduces friction between the latent buckle structure 6-4 and the spray coating on the outer side of the pressure pipe 2, thereby reducing the risk of rust.

[0041] According to another embodiment of the present invention, the gap-eliminating structure 6 - 5 is arc-shaped protrusions uniformly distributed around the circumference, and the enveloping diameter of the arc-shaped protrusions is larger than the inner diameter of the outer sleeve 7 .

[0042] According to another embodiment of the present invention, further comprising: reinforcing ribs 11 evenly distributed around the circumference are provided on the outer wall of the inner sleeve 6. Since the inner sleeve 6 has a thinner wall, the reinforcing ribs 11 can increase the strength of the inner sleeve 6 and ensure the strength and bearing capacity of the balance bar. The cross section of the reinforcing ribs 11 can be semicircular or triangular.

[0043] Preferably, the anti-gap structure 6-5 (i.e., arc-shaped protrusions uniformly distributed around the circumference) is arranged on the reinforcing rib 11 for easy processing and manufacturing. At this time, the cross section of the reinforcing rib 11 is triangular, which facilitates the arrangement of the arc-shaped protrusion on the reinforcing rib 11, thereby facilitating injection molding. In the present application, half of the cross section of the reinforcing rib 11 is a triangular cross section, and half is a semicircular cross section, and the semicircular cross section and the triangular cross section are arranged in a staggered manner. In addition, the arc-shaped protrusion is arranged on the reinforcing rib 11 with a triangular cross section.

[0044] It is worth mentioning that the balance bar involved in this application has a good force range, good lateral bearing capacity and can greatly reduce costs. It is applicable but not limited to automobile tailgate opening and closing systems, and can also be used in other industrial fields to play supporting and vibration reduction roles.

[0045] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all will fall within the scope of protection of the present invention.

Claims

1. A balance pole, characterized in that: The gas spring body (1) comprises a pressure tube (2), a piston (3) is arranged in the pressure tube (2), the piston (3) is connected to a piston rod (4), the pressure tube (2) is sealed at one end of the piston rod (4) by a sealing unit (5), the right end of the gas spring body (1) is sleeved with an inner sleeve (6), the left end of the gas spring body (1) is sleeved with an outer sleeve (7), the outer sleeve (7) is fixedly connected to the left end of the pressure tube (2) and covers the outside of the inner sleeve (6), the inner sleeve (6) is telescopic in the space formed by the outer sleeve (7) and the pressure tube (2), the end of the piston rod (4) is fixedly connected to a ball socket structure (8), the ball socket structure (8) is fixedly connected to the end of the inner sleeve (6), the end of the outer sleeve (7) is fixedly connected to a ball socket structure (9), The ball and socket structure one (8) is snap-connected to the end of the inner sleeve (6), and the inner wall of the inner sleeve (6) is provided with a structure that limits the further inward movement of the ball and socket structure one (8). A buckle structure (6-1) is provided at the end of the inner sleeve (6), a limiting structure (6-2) is provided on the inner wall of the inner sleeve (6), the connecting portion of the ball and socket structure part 1 (8) is a secondary boss structure, comprising a boss 1 (8-1) and a boss 2 (8-2), the boss 2 (8-2) being assembled between the buckle structure (6-1) and the limiting structure (6-2), The buckle structure (6-1) is at least three groups of buckles evenly distributed around the circumference, and the limiting structure (6-2) is at least three groups of inner bosses evenly distributed around the circumference. The buckles and inner bosses are the same in number and are staggered in arrangement. A strip groove (10) is provided between adjacent buckles and inner bosses. The outer wall of the inner sleeve (6) is provided with reinforcing ribs (11) evenly distributed around the circumference.

2. A balance pole according to claim 1, characterized in that: The left end of the inner sleeve (6) is an elastic gap-eliminating structure (6-3) adapted to the outer sleeve (7), the left inner wall of the inner sleeve (6) is provided with a latent buckle structure (6-4) adapted to the pressure pipe (2), and the right outer wall of the inner sleeve (6) is provided with a gap-eliminating structure (6-5) adapted to the outer sleeve (7).

3. A balance pole according to claim 2, characterized in that: The elastic clearance-eliminating structure (6-3) comprises an annular step (6-3-1) and axial strip grooves (6-3-2) uniformly distributed circumferentially on the tube wall, and the outer diameter of the annular step (6-3-1) is greater than the inner diameter of the outer sleeve (7).

4. A balance pole according to claim 2, characterized in that: A transition fillet is provided at the bottom edge of the latent buckle structure (6-4).

5. A balance pole according to claim 2, characterized in that: The gap-eliminating structures (6-5) are arc-shaped protrusions evenly distributed around the circumference.

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