Electric gas spring, car tailgate

Abstract

The utility model discloses an electric gas spring and a car tailgate, wherein the electric gas spring comprises a round tube, a threaded plug located outside the first end of the round tube and fixed to the round tube, a piston rod located at the second end of the round tube and movably connected to the round tube, and a reduction motor, a screw, a screw nut, a sealing ring, a first piston, a first seal, a spacer, a second piston, a second seal, and a third seal are sequentially arranged in the round tube along the axial direction from the first end to the second end. The first piston reciprocates along the axial direction of the round tube under the drive of the reduction motor, the screw and the screw nut. The electric gas spring can automatically adjust the thrust, is suitable for various working conditions, and also has the function of an electric support rod, does not need to use a high-power motor, the thrust curve is smoother, and the radial swing of the piston rod is small when it moves.

Description

Technical Field

[0001] The utility model belongs to the field of gas springs, in particular to an electric gas spring and a car tailgate. Background Art

[0002] Common electric gas springs use a lead screw to push the piston rod to extend and retract to generate thrust. When a larger thrust is required, a high-power motor and a mechanical spring with a larger outer diameter must be used. In addition, the electric gas spring cannot automatically adjust the thrust when working under different working conditions after leaving the factory. When used in a car tailgate, external force must be applied to achieve automatic opening and closing of the car tailgate. In addition, adjusting the thrust of the electric gas spring requires changing the length of the non-standard part - the piston rod, and the customization of the piston rod requires the use of different molds for stamping production, which is time-consuming and costly. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an electric gas spring, comprising: a round tube, a threaded plug located outside the first end of the round tube and fixed to the round tube, a piston rod located at the second end of the round tube and movably connected to the round tube, and a reduction motor, a screw rod, a screw rod nut, a sealing retaining ring, a first piston, a first sealing member, a spacer, a second piston, a second sealing member, and a third sealing member are sequentially arranged in the round tube along the axial direction from the first end to the second end;

[0004] in,

[0005] An outlet pipe is arranged inside the threaded plug;

[0006] The reduction motor is fixed in the round tube and its output shaft is connected to the lead screw, and the lead screw nut is located on the lead screw and is threadedly connected to the lead screw;

[0007] The first piston is a T-shaped piston, comprising an axial portion and a radial portion which are sequentially arranged along the axial direction of the circular tube and form an integral structure, wherein one end of the axial portion close to the reduction motor is fixed to the screw nut, and a sealing ring is fixedly arranged between the outer wall of the axial portion and the inner wall of the circular tube, and the sealing ring is used to isolate the space between the reduction motor and the radial portion into a first space between the reduction motor and the sealing ring and a second space between the sealing ring and the radial portion;

[0008] The spacer sleeve has a first central through hole and is fixed to the inner surface of the circular tube. A third space is formed between the spacer sleeve and the radial portion of the first piston. A first seal is fixedly arranged on the edge of the radial portion of the first piston. The first seal is used to isolate the second space and the third space, so that the second space becomes a first closed space.

[0009] The second piston is provided with a second central through hole and is fixed to one end of the piston rod located in the round tube. A second seal is fixedly arranged on the radial edge of the second piston. The second seal is used to seal the gap between the second piston and the inner wall of the round tube. A fourth space is formed between the second seal and the spacer.

[0010] The third sealing member is fixed between the outer wall of one end of the piston rod in the round tube and the inner wall of the round tube, and is used together with the first sealing member to make the third space and the fourth space become a second closed space, and the second closed space is filled with inert gas.

[0011] Furthermore, the second enclosed space is filled with hydraulic oil.

[0012] Furthermore, the first enclosed space is filled with high-pressure inert gas.

[0013] Furthermore, first limiting portions are provided on the outer wall of the circular tube at positions corresponding to the two edges of the sealing retaining ring along the axial direction of the circular tube.

[0014] Furthermore, a second limiting portion is provided on the outer wall of the circular tube at a position corresponding to the edge of the radial portion of the first piston facing the sealing retaining ring.

[0015] Furthermore, a third limiting portion is provided on the outer wall of the circular tube at a position corresponding to two radial edges of the spacer.

[0016] Furthermore, a guide sleeve is fixedly arranged between the inner wall of the second end of the circular tube and the outer wall of one end of the piston rod located in the circular tube.

[0017] Furthermore, a thread is provided at the end of the piston rod located outside the round tube.

[0018] Furthermore, the round tube is a steel round tube.

[0019] The utility model also provides a car tailgate, comprising the above-mentioned electric gas spring.

[0020] Compared with the prior art, the electric gas spring provided by the utility model has an automatically adjustable thrust and is suitable for various working conditions. It also has the function of an electric support rod. When used for a car tailgate, the car tailgate can be automatically opened and closed without applying external force. There is no need to use a high-power motor, the thrust curve is smoother, and the radial swing of the piston rod is small when it moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of an electric gas spring according to an embodiment of the utility model is shown;

[0022] Description of main reference numerals:

[0023] 1: threaded plug, 2: reduction motor, 3: screw, 4: screw nut, 5.1: first limiting part, 5.2: second limiting part, 5.3: third limiting part, 6: sealing ring, 7: first sealing member, 8: first piston, 9: spacer, 10: second piston, 11: second sealing member, 12: third sealing member, 13: guide sleeve, D: first space, C: second space, B: third space, A: fourth space. DETAILED DESCRIPTION

[0024] The specific implementation of the utility model is described in detail below. It should be understood that the implementation of the utility model is not limited to the embodiments shown in the accompanying drawings, and the protection scope of the utility model is not limited by the specific implementation. The words "first", "second" and similar words used in the utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Unless otherwise expressly indicated, throughout the specification and claims, the term "include" or its changes such as "include" or "include" will be understood to include the stated elements or components, without excluding other elements or other components. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Unless otherwise defined, the meanings of all technical terms and scientific terms used in the present invention are the same as those generally understood by ordinary technicians in the field. In addition, the meanings of the technical terms and scientific terms used in the present invention should be interpreted as having the same meaning as the corresponding terms defined in commonly used technical manuals, and should not be interpreted as having idealized or excessively formal meanings, unless explicitly defined in this utility model.

[0026] Figure 1 The schematic diagram of the structure of the electric gas spring of the utility model is shown in FIG. Figure 1 The electric gas spring includes: a round tube, a threaded plug 1 located outside the first end of the round tube and fixed to the round tube, a piston rod 14 located at the second end of the round tube and movably connected to the round tube, and the inner edge of the round tube 1 is sequentially arranged along the axial direction from the first end to the second end: a reduction motor 2, a screw 3, a screw nut 4, a sealing ring 6, a first piston 8, a first sealing member 7, a spacer 9, a second piston 10, a second sealing member 11, and a third sealing member 12.

[0027] An outlet pipe is arranged inside the threaded plug 1, which is used to set the power line, control line, etc. of the reduction motor 2, and the thread of the threaded plug 1 is used to connect other accessories.

[0028] The reduction motor 2 is fixed in the round tube and its output shaft is connected to the screw rod 3. The screw nut 4 is located on the screw rod 3 and is threadedly connected to the screw rod 4. The reduction motor 2 can rotate forward and reverse.

[0029] The first piston 8 is a T-shaped piston, including an axial portion and a radial portion which are sequentially arranged along the axial direction of the round tube and form an integral structure. The end of the axial portion close to the reduction motor 2 is fixed to the screw nut 4. A sealing ring 6 is fixedly arranged between the outer wall of the axial portion and the inner wall of the round tube. The sealing ring 6 isolates the space between the reduction motor 2 and the radial portion into a first space D located between the reduction motor 2 and the sealing ring 6 and a second space C located between the sealing ring 6 and the radial portion. The first piston 8 reciprocates along the axial direction of the round tube under the drive of the reduction motor 2, the screw 3, and the screw nut 4.

[0030] The spacer 9 has a first central through hole and is fixed to the inner surface of the round tube, and is used to limit the axial movement distance of the first piston 8 and the piston rod 14 to prevent the first piston 8 and the piston rod 14 from colliding and being pressed. A third space B is formed between the spacer 9 and the radial portion of the first piston 8. A first seal 7 is fixedly arranged on the edge of the radial portion of the first piston 8, and the first seal 7 is used to isolate the second space C and the third space B, so that the second space C becomes a first closed space.

[0031] The second piston 10 has a second central through hole and is fixed to one end of the piston rod 14 located in the round tube. A second seal 11 is fixedly arranged on the radial edge of the second piston 10. The second seal 11 is used to seal the gap between the second piston 10 and the inner wall of the round tube. A fourth space A is formed between the second seal 11 and the spacer 9. By adjusting the diameter of the second central through hole, the expansion and contraction speed of the electric gas spring can be adjusted.

[0032] The third seal 12 is fixed between the outer wall of one end of the piston rod 14 in the circular tube and the inner wall of the circular tube, and is used as a one-way valve, which is used together with the first seal 7 to make the third space B and the fourth space A become a second enclosed space, and inert gas is injected into the second enclosed space through the third seal 12.

[0033] Furthermore, in order to facilitate the connection with other accessories, a thread is provided at the end of the piston rod 14 located outside the round tube.

[0034] Furthermore, in order to adjust the thrust curve of the electric gas spring and make the thrust curve smoother, hydraulic oil is injected into the second enclosed space.

[0035] Furthermore, in order to offset the pressure difference in the second enclosed space and reduce the required output power of the reduction motor 2, high-pressure inert gas is injected into the first enclosed space.

[0036] Furthermore, in order to reduce the radial swing of the piston rod 14 during movement, a guide sleeve 13 is fixedly disposed between the inner wall of the second end of the circular tube and the outer wall of the end of the piston rod 14 located inside the circular tube.

[0037] Furthermore, in order to limit the sealing ring 6 from moving in the axial direction of the tube, first limiting portions 5.1 are provided on the outer wall of the tube at positions corresponding to the two edges of the sealing ring 6 in the axial direction of the tube.

[0038] Furthermore, in order to limit the moving distance of the first piston 8 along the axial direction of the tube toward the sealing ring 6, a second limiting portion 5.2 is provided on the outer wall of the tube at a position corresponding to the edge of the radial portion of the first piston 8 toward the sealing ring 6.

[0039] Furthermore, in order to limit the spacer sleeve 9 from moving in the axial direction of the circular tube, a third limiting portion 5.3 is provided on the outer wall of the circular tube at positions corresponding to the two radial edges of the spacer sleeve 9.

[0040] Furthermore, in order to enable the electric gas spring to have the function of an electric support rod and improve the overall structural strength of the electric gas spring, the round tube is a steel round tube.

[0041] like Figure 1 As shown, the diameter of the round tube is D, and the diameter of the piston rod 14 body is d. This embodiment does not impose specific numerical restrictions on D and d.

[0042] The thrust F of the electric gas spring provided by the utility model can be expressed by the formula F=P×π×(d / 2) 2 , P represents the gas pressure in the second confined space. When the electric gas spring is working, the first piston 8 is driven to reciprocate along the axial direction of the tube by the reduction motor 2, the screw 3, and the screw nut 4, so that the volume of the second confined space can be changed, and then the gas pressure in the second confined space is changed, resulting in a change in the thrust F.

[0043] In summary, the utility model provides an electric gas spring, which has a high degree of automation by arranging a round steel pipe, a threaded plug 1, a reduction motor 2, a screw 3, a screw nut 4, a sealing ring 6, a first piston 8, a first seal 7, a spacer 9, a second piston 10, a second seal 11, a third seal 12, a guide sleeve 13, and a piston rod 14. The thrust can be automatically adjusted and the adjustment is simple. The gas spring is suitable for various working conditions, especially the working conditions where the initial force needs to be very small and a very large force is required to open automatically after full compression. The gas spring also has the function of an electric support rod. When used for a car tailgate, the car tailgate can be automatically opened and closed without applying external force. In addition, there is no need to use a high-power motor, the thrust curve is smoother, and the radial swing of the piston rod when moving is small.

[0044] The utility model also provides a car tailgate, which comprises the above-mentioned electric gas spring.

[0045] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different options and changes. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. Electric gas spring, characterized in that: include: A round tube, a threaded plug located outside the first end of the round tube and fixed to the round tube, a piston rod located at the second end of the round tube and movably connected to the round tube, and a reduction motor, a screw rod, a screw rod nut, a sealing retaining ring, a first piston, a first sealing member, a spacer, a second piston, a second sealing member, and a third sealing member are sequentially arranged in the round tube along the axial direction from the first end to the second end; in, A wire outlet pipe is arranged inside the threaded plug; The reduction motor is fixed in the round tube and its output shaft is connected to the screw rod. The screw rod nut is located on the screw rod and is threadedly connected to the screw rod. The first piston is a T-shaped piston, comprising an axial portion and a radial portion which are sequentially arranged along the axial direction of the circular tube and form an integral structure, the end of the axial portion close to the reduction motor is fixed to the screw nut, the sealing ring is fixedly arranged between the outer wall of the axial portion and the inner wall of the circular tube, and the sealing ring is used to isolate the space between the reduction motor and the radial portion into a first space located between the reduction motor and the sealing ring, and a second space located between the sealing ring and the radial portion; The spacer sleeve has a first central through hole and is fixed to the inner surface of the circular tube, a third space is formed between the spacer sleeve and the radial portion of the first piston, the first seal is fixedly arranged on the edge of the radial portion of the first piston, and the first seal is used to isolate the second space and the third space, so that the second space becomes a first closed space; The second piston has a second central through hole and is fixed to one end of the piston rod located in the round tube. The second sealing member is fixedly arranged on the radial edge of the second piston. The second sealing member is used to seal the gap between the second piston and the inner wall of the round tube. A fourth space is formed between the second sealing member and the spacer. The third seal is fixed between the outer wall of one end of the piston rod in the round tube and the inner wall of the round tube, and is used together with the first seal to make the third space and the fourth space become a second closed space, and the second closed space is filled with inert gas.

2. The electric gas spring according to claim 1, characterized in that: The second enclosed space is filled with hydraulic oil.

3. The electric gas spring according to claim 2, characterized in that: The first enclosed space is filled with high-pressure inert gas.

4. The electric gas spring according to claim 3, characterized in that: First limiting parts are arranged on the outer wall of the circular tube at positions corresponding to the two edges of the sealing retaining ring along the axial direction of the circular tube.

5. The electric gas spring according to claim 3, characterized in that: A second limiting portion is arranged on the outer wall of the circular tube at a position corresponding to the edge of the radial portion of the first piston facing the sealing retaining ring.

6. The electric gas spring according to claim 3, characterized in that: A third limiting portion is arranged on the outer wall of the circular tube at positions corresponding to the two radial edges of the spacer.

7. The electric gas spring according to any one of claims 4 to 6, characterized in that: A guide sleeve is fixedly arranged between the inner wall of the second end of the circular tube and the outer wall of one end of the piston rod located in the circular tube.

8. The electric gas spring according to claim 7, characterized in that: The end of the piston rod located outside the round tube is provided with a thread.

9. The electric gas spring according to claim 8, characterized in that: The round tube is a steel round tube.

10. Automobile tailgate, characterized in that: Comprising the electric gas spring as claimed in claim 8.

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