Automobile electric tail door supporting rod

Abstract

The utility model relates to the technical field of automobile tail door supporting rods, in particular to an automobile electric tail door supporting rod. The gas spring comprises an outer sleeve, an inner sleeve and a gas spring body, the inner sleeve can stretch out and draw back relative to the outer sleeve, the gas spring body comprises a cylinder barrel and a piston rod, external threads are arranged on the peripheral face of the piston rod, the cylinder barrel is detachably and fixedly connected with a transmission connecting piece, and an internal threaded hole is formed in the transmission connecting piece. One end of the cylinder barrel is in sealed sliding connection with the piston end of the piston rod, the other end of the cylinder barrel is in sealed fixed connection with the end, close to the first fixing head, of the outer sleeve, a driving device is arranged in the inner sleeve, and the transmission connecting piece is provided with an oil adding mechanism capable of automatically adding lubricating oil into an inner threaded hole in the transmission connecting piece in the shrinkage process of the supporting rod. After the prior art is improved, lubricating oil is automatically supplemented once after the automobile tail door is opened and closed each time through the oil adding mechanism, abrasion in the thread transmission process between the piston rod and the transmission connecting piece is reduced, and therefore the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile tailgate support rods, in particular to an automobile electric tailgate support rod. Background Art

[0002] The electric struts are usually installed on the tailgate of the car to realize the automatic opening and closing of the tailgate. Traditional electric struts are usually equipped with compression springs to offset part of the door weight and assist in opening and closing the door. However, the compression springs require a large space, which results in a large outer diameter of the electric struts. When the electric struts are damaged, the compression springs are constantly compressed, which will generate an instantaneous explosive force, which can easily cause the struts to explode and injure people, and the safety factor is low.

[0003] In view of this, a Chinese patent document with the authorization number CN210087097U discloses an electric strut for automobiles, comprising an outer sleeve, an inner sleeve and a gas spring arranged in sequence from the outside to the inside, the inner sleeve can be telescopic relative to the outer sleeve, one end of the outer sleeve is connected to a first fixed head, the end of the inner sleeve extending from the outer sleeve is connected to a second fixed head, the gas spring comprises a cylinder and a piston rod, an air storage chamber is formed in the cylinder, one end of the piston rod is movably arranged in the cylinder, the other end passes through the cylinder and is rotatably connected to the second fixed head, the cylinder and the inner sleeve are transmission-connected, a driving device is arranged in the outer sleeve, the driving device is used to drive the cylinder to rotate, and then drive the inner sleeve to make a linear motion along the axial direction; although the gas spring is used to replace the compression spring to provide auxiliary supporting force, reduce the overall size of the electric strut and improve the safety factor, the thread transmission between the cylinder and the inner sleeve, the thread is easily worn after long-term use, and the service life is affected. In addition, after the loss of lubricating oil between the cylinder and the inner sleeve, it cannot be automatically replenished in time, resulting in increased friction resistance, affecting the lifting speed of the automobile tailgate.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an automobile electric tailgate support rod in view of the deficiencies of the above-mentioned prior art, so as to solve the problem that the prior art cannot automatically replenish lubricating oil, resulting in easy wear of the rear thread over a long period of time, thus affecting the service life, and the friction resistance becomes large, thus affecting the smooth lifting and lowering operation of the automobile tailgate.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automobile electric tailgate support rod, comprising an outer sleeve, an inner sleeve and a gas spring which are arranged in sequence from the outside to the inside, the inner sleeve being retractable relative to the outer sleeve, one end of the outer sleeve being connected to a first fixed head, the end of the inner sleeve extending out of the outer sleeve being connected to a second fixed head, the gas spring comprising a cylinder and a piston rod, an air storage chamber being formed in the cylinder, an outer circumferential surface of the piston rod being provided with an external thread, an end of the cylinder near the second fixed head being detachably fixedly connected to a transmission connecting piece, an internal threaded hole matching the external thread being provided on the transmission connecting piece, one end of the cylinder being sealingly and slidingly connected to a piston end of the piston rod, and the other end being sealingly and fixedly connected to an end of the outer sleeve near the first fixed head, a driving device for driving the piston rod to rotate being provided in the inner sleeve, and an oiling mechanism being provided on the transmission connecting piece which can automatically add lubricating oil to the internal threaded hole on the transmission connecting piece during the contraction of the support rod.

[0007] By adopting the above technical scheme, when the tailgate of the car is opened or closed, that is, when the electric tailgate support rod of the car needs to be extended or retracted, the driving device drives the piston rod to rotate and transmits with the transmission connection piece threadedly, so that the transmission connection piece moves along the axial direction of the piston rod and drives the cylinder barrel and the outer sleeve to extend or retract relative to the outer sleeve; when the tailgate of the car is closed, the electric tailgate support rod of the car contracts, and the oil adding mechanism is triggered to automatically add lubricating oil to the internal threaded hole on the transmission connection piece, and the lubricating oil can flow to the external thread of the piston rod, so that the lubricating oil is automatically replenished every time the tailgate of the car is opened or closed, thereby reducing the wear of the threaded transmission process between the piston rod and the transmission connection piece, thereby extending the service life.

[0008] The above technical scheme is further configured as follows: the oil adding mechanism comprises an oil storage part, an elastic rubber ring and a sponge gasket arranged at one end of the transmission connecting part near the second fixed head, the oil storage part is provided with an oil storage cavity, the oil storage part is provided with a mounting through hole connected to the oil storage cavity on the side near the second fixed head, a breathing cavity is provided in the elastic rubber ring, and a plug is provided on the side of the elastic rubber ring near the mounting through hole with an interference fit with the mounting through hole, the oil storage cavity and the breathing cavity are connected through the plug, the transmission connecting part is provided with an annular groove, the sponge gasket is sleeved in the annular groove, the oil storage part is provided with an oil outlet through hole connected to the oil storage cavity on the side away from the elastic rubber ring, the orifice of the oil outlet through hole can abut against the side of the sponge gasket, and a plurality of oil adding through holes connected to the internal threaded hole are evenly distributed on the bottom surface of the annular groove, and the external thread of the piston rod is provided with an extrusion part close to the driving device on the side that can abut and squeeze the elastic rubber ring during the contraction of the strut.

[0009] By adopting the above technical scheme, when the tailgate of the car is closed, the support rod of the electric tailgate of the car is extended and retracted, and the piston rod drives the transmission connecting part to approach the extrusion part until the extrusion part abuts against and squeezes the elastic rubber ring installed on the oil storage part, so that the volume of the breathing cavity in the elastic rubber ring becomes smaller, and then the lubricating oil in the oil storage cavity is squeezed out through the oil outlet hole onto the sponge gasket through the intubation tube. The sponge gasket absorbs the lubricating oil, and the lubricating oil on the sponge gasket slowly seeps into the inner threaded hole through the oil adding hole, thereby realizing a one-time automatic oil adding lubricating oil function; when the tailgate of the car is opened, after the extrusion part is away from the elastic rubber ring, the elastic rubber ring restores its shape and sucks air into the oil storage cavity.

[0010] The above technical solution is further configured as follows: the end of the transmission connecting member away from the oil storage part is interference fit with the cylinder, the side surface of the oil storage part abuts against the side surface of the cylinder, and the outer circumferential surface of the sponge gasket abuts against the inner circumferential surface of the cylinder.

[0011] By adopting the above technical solution, the transmission connector and the cylinder barrel are detachably fixedly connected through interference fit, which has a simple structure and is easy to install. The sponge gasket is further limited by the cylinder barrel, while the sealing is improved to avoid waste caused by leakage of lubricating oil.

[0012] The above technical solution is further configured as follows: an oil filling through hole communicating with the oil storage cavity is provided on the outer peripheral surface of the oil storage portion, and an oil filling plug is connected to the oil filling through hole by interference fit.

[0013] By adopting the above technical solution, when adding lubricating oil for the first time or replenishing lubricating oil again, the oil filling plug is removed, the lubricating oil is injected into the oil storage cavity through the oil filling through hole, and then the oil filling plug is plugged again.

[0014] The above technical solution is further configured as follows: a limit cylinder is provided between the piston rod and the inner sleeve, one end of the limit cylinder is provided with a first limit seat rotatably connected to the piston rod, and the other end is provided with a second limit seat slidably connected to the outer periphery of the cylinder, and the extrusion portion is provided on the side of the first limit seat close to the elastic rubber ring.

[0015] By adopting the above technical solution, the piston rod is limited by the first limiting seat of the limiting cylinder, and the cylinder is limited by the second limiting seat of the limiting cylinder, so that the relative movement between the piston rod and the cylinder is more stable.

[0016] The above technical solution is further configured as follows: a sealing member is connected to the end of the cylinder away from the transmission connecting member by interference fit, and a mounting seat for mounting the sealing member is provided in the first fixing head.

[0017] By adopting the above technical solution, a sealed connection is achieved through interference fit between the seal and the cylinder barrel, and the seal is fixedly installed by the mounting seat.

[0018] The above technical solution is further configured as follows: the driving device includes a driving motor and a bearing seat clamped with the driving motor, a bearing sleeved on one end of a piston rod is installed in the bearing seat, and the piston rod passes through one end of the bearing and is transmission-connected to the driving motor through a spline.

[0019] By adopting the above technical solution, the driving motor drives the piston rod to rotate, and the bearing seat and the bearing make the piston rod rotate more smoothly.

[0020] The above technical solution is further configured as follows: a dustproof sleeve is provided on the outer periphery of one end of the outer sleeve connected to the inner sleeve, a plurality of clamping holes are provided on the outer periphery of one end of the outer sleeve close to the dustproof sleeve, a clamping block is provided on the inner wall of the dustproof sleeve for clamping with the clamping holes, one end of the dustproof sleeve close to the inner sleeve is clearance-fitted with the inner sleeve, and the other end is transitionally fitted with the outer sleeve.

[0021] By adopting the above technical solution, the dustproof sleeve can prevent sand or debris from falling into between the outer sleeve and the inner sleeve to a certain extent, thereby preventing the wear and tear caused by the dustproof sleeve.

[0022] The utility model has the beneficial effect that the lubricating oil is automatically replenished once after the tailgate of the automobile is opened and closed each time through the oil replenishing mechanism, thereby reducing the wear of the threaded transmission process between the piston rod and the transmission connecting piece, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional view of an embodiment of the utility model;

[0026] Figure 4 yes Figure 3 Partial view at A in the middle;

[0027] Figure 5 It is a schematic diagram of the explosion structure of the oil adding mechanism in the embodiment of the utility model;

[0028] Figure 6 It is a structural schematic diagram of a transmission connecting member in an embodiment of the utility model;

[0029] Figure 7 It is a structural schematic diagram of the elastic rubber ring in the embodiment of the utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1-7 As shown in the figure, an electric tailgate support rod for an automobile comprises an outer sleeve 1, an inner sleeve 2 and a gas spring 3 which are arranged in sequence from the outside to the inside. The inner sleeve 2 can be telescopic relative to the outer sleeve 1. One end of the outer sleeve 1 is connected to a first fixing head 11. The end of the inner sleeve 2 extending from the outer sleeve 1 is connected to a second fixing head 21. The gas spring 3 comprises a cylinder 31 and a piston rod 32. An air storage cavity is formed in the cylinder 31. An external thread 321 is provided on the outer circumferential surface of the piston rod 32. One end of the cylinder 31 near the second fixing head 21 is detachably fixedly connected to a transmission connection The transmission connecting member 4 is provided with an internal thread hole 40 matching the external thread 321. One end of the cylinder 31 is sealed and slidably connected to the piston end of the piston rod 32, and the other end is sealed and fixedly connected to the end of the outer sleeve 1 close to the first fixed head 11. The inner sleeve 2 is provided with a driving device 5 for driving the piston rod 32 to rotate. The transmission connecting member 4 is provided with an oiling mechanism that can automatically add lubricating oil to the internal thread hole 40 on the transmission connecting member 4 during the contraction of the support rod. The oiling mechanism includes an end of the transmission connecting member 4 close to the second fixed head 21. An oil storage part 41, an elastic rubber ring 42 and a sponge gasket 43 are provided, an oil storage cavity 410 is provided in the oil storage part 41, a mounting through hole 411 connected to the oil storage cavity 410 is provided on the side of the oil storage part 41 close to the second fixed head 21, a breathing cavity 420 is provided in the elastic rubber ring 42, a plug 421 with an interference fit with the mounting through hole 411 is provided on the side of the elastic rubber ring 42 close to the mounting through hole 411, the oil storage cavity 410 is connected to the breathing cavity 420 through the plug 421, an annular groove 44 is provided on the transmission connecting part 4, and the sponge gasket 43 is provided. The ring 43 is sleeved in the annular groove 44, and an oil outlet hole 412 connected to the oil storage chamber 410 is provided on the side of the oil storage portion 41 away from the elastic rubber ring 42, and the orifice of the oil outlet hole 412 can abut against the side of the sponge gasket 43, and a plurality of oil filling holes 440 connected to the internal threaded hole 40 are evenly distributed on the bottom surface of the annular groove 44. The external thread 321 of the piston rod 32 is provided near the side of the driving device 5 with an extrusion portion 45 that can abut and squeeze the elastic rubber ring 42 during the contraction of the strut, and the elastic rubber ring 42 is made of rubber material.

[0032] The end of the transmission connecting member 4 away from the oil storage part 41 is interference fit with the cylinder 31, the side of the oil storage part 41 is in contact with the side of the cylinder 31, the outer circumferential surface of the sponge gasket 43 is in contact with the inner circumferential surface of the cylinder 31, and an oil filling hole 413 connected to the oil storage chamber 410 is provided on the outer circumferential surface of the oil storage part 41, and an oil filling plug 414 is connected to the oil filling hole 413 by interference fit.

[0033] A limiting cylinder 6 is provided between the piston rod 32 and the inner sleeve 2, one end of the limiting cylinder 6 is provided with a first limiting seat 61 rotatably connected to the piston rod 32, and the other end is provided with a second limiting seat 62 slidably connected to the outer periphery of the cylinder 31, the extrusion portion 45 is arranged on the side of the first limiting seat 61 close to the elastic rubber ring 42, the end of the cylinder 31 away from the transmission connecting member 4 is interference fit connected with a seal 46, and a mounting seat 47 for mounting the seal 46 is provided in the first fixed head 11.

[0034] The driving device 5 includes a driving motor 51 and a bearing seat 52 clamped with the driving motor 51. A bearing 53 sleeved on one end of the piston rod 32 is installed in the bearing seat 52. The piston rod 32 passes through one end of the bearing 53 and is transmission-connected to the driving motor 51 through a spline.

[0035] A dustproof sleeve 7 is provided on the outer periphery of one end of the outer sleeve 1 connected to the inner sleeve 2. A plurality of clamping holes 10 are provided on the outer periphery of one end of the outer sleeve 1 close to the dustproof sleeve 7. A clamping block 71 is provided on the inner wall of the dustproof sleeve 7 for clamping with the clamping holes 10. One end of the dustproof sleeve 7 close to the inner sleeve 2 is clearance-fitted with the inner sleeve 2, and the other end is transitionally fitted with the outer sleeve 1.

[0036] In the above embodiment, when the tailgate of the automobile is opened or closed, that is, when the electric tailgate support rod of the automobile needs to be extended or retracted, the driving motor 51 drives the piston rod 32 to rotate and transmits the transmission connection member 4 with a thread, thereby causing the transmission connection member 4 to move axially along the piston rod 32 and drive the cylinder 31 and the outer sleeve 1 to extend or retract relative to the outer sleeve 1; when the tailgate of the automobile is closed, the electric tailgate support rod of the automobile extends or retracts, and the piston rod 32 drives the transmission connection member 4 to approach the extrusion portion 45 until the extrusion portion 45 abuts against and squeezes the elastic rubber ring 42 installed on the oil storage portion 41, so that the volume of the breathing cavity 420 in the elastic rubber ring 42 becomes smaller, and then the breathing cavity 420 in the elastic rubber ring 42 is reduced. The lubricating oil in the oil storage chamber 410 is squeezed out through the oil outlet hole 412 onto the sponge gasket 43 through the insert tube 421. The sponge gasket 43 absorbs the lubricating oil, and the lubricating oil on the sponge gasket 43 slowly seeps into the inner threaded hole 40 through the oil adding hole 440, thereby realizing a one-time automatic lubricating oil adding function; when the tailgate of the car is opened, after the extrusion portion 45 is away from the elastic rubber ring 42, the elastic rubber ring 42 restores its shape and sucks air into the oil storage chamber 410; therefore, the lubricating oil is automatically replenished once after each opening and closing of the tailgate of the car, thereby reducing the wear of the threaded transmission process between the piston rod and the transmission connector, thereby extending the service life.

Claims

1. An electric tailgate support rod for an automobile, comprising an outer sleeve, an inner sleeve and a gas spring arranged in sequence from the outside to the inside, the inner sleeve can be extended and retracted relative to the outer sleeve, one end of the outer sleeve is connected to a first fixing head, the end of the inner sleeve extending from the outer sleeve is connected to a second fixing head, the gas spring comprises a cylinder and a piston rod, an air storage chamber is formed in the cylinder, and is characterized in that: The outer circumferential surface of the piston rod is provided with an external thread, and the cylinder barrel is detachably fixedly connected with a transmission connecting piece at one end near the second fixed head, and the transmission connecting piece is provided with an internal threaded hole matching the external thread. One end of the cylinder barrel is sealingly and slidingly connected to the piston end of the piston rod, and the other end is sealingly and fixedly connected to the end of the outer sleeve near the first fixed head. A driving device for driving the piston rod to rotate is provided in the inner sleeve, and the transmission connecting piece is provided with an oil adding mechanism that can automatically add lubricating oil to the internal threaded hole on the transmission connecting piece during the contraction of the strut.

2. The electric tailgate support rod for automobile according to claim 1, characterized in that: The oil adding mechanism comprises an oil storage part, an elastic rubber ring and a sponge gasket, which are arranged at one end of the transmission connecting part near the second fixed head. The oil storage part is provided with an oil storage cavity, and the oil storage part is provided with a mounting through hole connected to the oil storage cavity on the side near the second fixed head. A breathing cavity is provided in the elastic rubber ring, and a plug is provided on the side of the elastic rubber ring near the mounting through hole, which is interference fit with the mounting through hole. The oil storage cavity and the breathing cavity are connected through the plug. An annular groove is provided on the transmission connecting part, and the sponge gasket is sleeved in the annular groove. The oil storage part is provided with an oil outlet through hole connected to the oil storage cavity on the side away from the elastic rubber ring, and the orifice of the oil outlet through hole can abut against the side of the sponge gasket. A plurality of oil adding through holes connected to the internal threaded hole are evenly distributed on the bottom surface of the annular groove. The external thread of the piston rod is provided with an extrusion part close to the driving device, which can abut and squeeze the elastic rubber ring during the contraction of the strut.

3. The electric tailgate support rod for automobile according to claim 2, characterized in that: The end of the transmission connection member away from the oil storage part is interference fit with the cylinder barrel, the side surface of the oil storage part abuts against the side surface of the cylinder barrel, and the outer peripheral surface of the sponge gasket abuts against the inner peripheral surface of the cylinder barrel.

4. The electric tailgate support rod for automobile according to claim 3, characterized in that: An oil filling through hole communicating with the oil storage cavity is arranged on the outer peripheral surface of the oil storage part, and an oil filling plug is connected with the oil filling through hole by interference fit.

5. The electric tailgate support rod for automobile according to claim 4, characterized in that: A limiting cylinder is provided between the piston rod and the inner sleeve, one end of the limiting cylinder is provided with a first limiting seat rotatably connected to the piston rod, and the other end is provided with a second limiting seat slidably connected to the outer circumference of the cylinder, and the extrusion part is arranged on the side of the first limiting seat close to the elastic rubber ring.

6. The electric tailgate support rod for automobile according to claim 5, characterized in that: A sealing member is connected to the cylinder barrel through interference fit at one end away from the transmission connection member, and a mounting seat for mounting the sealing member is provided in the first fixed head.

7. The electric tailgate support rod of an automobile according to any one of claims 1 to 6, characterized in that: The driving device includes a driving motor and a bearing seat clamped with the driving motor. A bearing sleeved on one end of a piston rod is installed in the bearing seat. The piston rod passes through one end of the bearing and is transmission-connected to the driving motor through a spline.

8. The electric tailgate support rod for automobile according to claim 7, characterized in that: A dustproof sleeve is provided on the outer periphery of one end of the outer sleeve connected to the inner sleeve, a plurality of clamping holes are provided on the outer periphery of one end of the outer sleeve close to the dustproof sleeve, a clamping block is provided on the inner wall of the dustproof sleeve for clamping with the clamping holes, one end of the dustproof sleeve close to the inner sleeve is clearance-fitted with the inner sleeve, and the other end is transitionally fitted with the outer sleeve.

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