A transmission device for a vehicle tailgate strut

Abstract

The present invention discloses a transmission device for a tailgate support rod of an automobile, comprising a first housing having a first cavity, a motor, a first gear connected to a rotating shaft of the motor, a second gear meshing with the first gear, a turntable, a third gear fixed to the turntable, a duplex gear meshing with the third gear, a sixth gear meshing with the duplex gear, and an output screw connected to the sixth gear; the motor, the first gear, the turntable, and the third gear are arranged in sequence; the sixth gear and the output screw are arranged in sequence; a circular ring is fixed on the inner wall of the first cavity, a first rack meshing with the second gear is arranged on the circular ring, a first axle is provided on the turntable, the second gear is mounted on the first axle, the duplex gear has a fourth gear and a fifth gear, the fourth gear meshing with the third gear, and the fifth gear meshing with the sixth gear. The present invention combines a reduction box with a transmission box to reduce the production cost of the transmission device of the tailgate support rod of an automobile, and belongs to the technical field of transmission devices.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, in particular to a transmission device used for a tailgate support rod of an automobile. Background Art

[0002] At present, most of the parallel axes of cars are designed independently. The so-called independent design means that the motor is first matched with the reduction gearbox to achieve the required reduction ratio, and then the parallel transmission is realized through the 1:1 transmission box; the reduction gearbox and the transmission box move independently, and the gears of the transmission box have no reduction function, which increases the cost of the car tailgate strut transmission device. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the purpose of the present invention is to provide a transmission device for a car tailgate strut. The present invention combines a reduction gearbox with a transmission box, which can not only reduce the speed of the motor, but also transmit the rotational power of the motor to the car tailgate strut, thereby reducing the production cost of the transmission device of the car tailgate strut.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A transmission device for a tailgate support rod of an automobile comprises a first housing having a first cavity, a motor, a first gear connected to a rotating shaft of the motor, a second gear meshing with the first gear, a turntable, a third gear fixed to the turntable and rotating coaxially with the turntable, a double gear meshing with the third gear, a sixth gear meshing with the double gear, and an output screw connected to the sixth gear; the motor, the first gear, the turntable, and the third gear are arranged in sequence along a first predetermined linear direction, and the rotating shaft of the motor, the first gear, the turntable, and the third gear all rotate coaxially; the sixth gear and the output screw are arranged in sequence along a second predetermined linear direction, and the sixth gear and the output screw rotate coaxially; the first predetermined linear direction is parallel to the second predetermined linear direction;

[0006] A circular ring is fixed on the inner wall of the first cavity, and the first gear and the second gear are both located in the area surrounded by the circular ring. A first rack meshing with the second gear is provided on the inner circumferential side of the circular ring. A first axle is provided on the turntable, and the second gear is mounted on the first axle. The double gear has a fourth gear and a fifth gear that rotate coaxially, the fourth gear meshes with the third gear, and the fifth gear meshes with the sixth gear.

[0007] Furthermore, the transmission device for the tailgate support rod of a car also includes a second shell having a second cavity; the second shell is connected to the first shell, the second cavity is communicated with the first cavity, a first bearing is installed in the first cavity, and a second axle is fixed on the third gear and rotates coaxially with the third gear, and the second axle is rotatably mounted on the first bearing.

[0008] Furthermore, a third axle is installed in the first cavity, the fourth gear and the fifth gear are both installed on the third axle, and the fourth gear and the fifth gear are both located in the first cavity.

[0009] Furthermore, a second bearing is installed in the first cavity, and a fourth axle is fixed on the sixth gear and rotates coaxially with the sixth gear. The fourth axle is rotatably installed on the second bearing.

[0010] Furthermore, a rod hole is provided on the fourth axle, a second rack is provided on the inner wall of the rod hole, a third rack is provided on the upper ring of the output screw and meshes with the second rack, and the output screw is installed in the rod hole of the fourth axle through the engagement of the second rack and the third rack.

[0011] Furthermore, the transmission device for the automobile tailgate support rod also includes a third shell having a third cavity; the third shell is connected to the first shell, the third cavity is communicated with the first cavity, the third cavity is installed with a third bearing, one end of the fourth wheel shaft is rotatably mounted on the second bearing, the other end of the fourth wheel shaft is rotatably mounted on the third bearing, and the output screw is installed in the third cavity.

[0012] Furthermore, a fourth bearing is installed in the third cavity, and the fourth bearing is sleeved on the output screw.

[0013] Furthermore, the diameter of the fourth gear is smaller than the diameter of the fifth gear.

[0014] Furthermore, the motor is located in the second cavity.

[0015] Furthermore, there are multiple second gears and multiple first axles, and the multiple first axles correspond to the multiple second gears one by one. The multiple second gears are evenly distributed along the circumference of the first gear, and the multiple second gears are all engaged with the first gear.

[0016] Compared with the prior art, the present invention has the following advantages: it combines the functions of a reduction gearbox and a transmission box into one, resulting in a simple and compact transmission structure, which can reduce the production cost and complexity of the transmission. The present invention fixes the first, second, and third housings together through laser welding. The motor's shaft, first gear, turntable, and third gear all rotate coaxially, and the sixth gear rotates coaxially with the output screw, ensuring the coaxiality of power transmission and achieving parallel power transmission, thereby ensuring the coaxiality of the transmission and the stability of its operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a transmission device for a tailgate support rod of an automobile.

[0018] Figure 2 It is a structural diagram of a transmission device for a tailgate support rod of an automobile.

[0019] Figure 3 The diagram is a schematic structural diagram of a transmission device for a tailgate support rod of an automobile, omitting the first housing and the third housing.

[0020] Figure 4 It is an installation diagram of the ring, the first rack, the turntable, the third gear, and the second axle.

[0021] Figure 5 This is a schematic diagram of the installation of the first bearing, the first rack, the turntable, the third gear, and the second axle.

[0022] In the figure, 1 is the first shell, 2 is the second shell, 3 is the third shell, 4 is the first gear, 5 is the second gear, 6 is the third gear, 7 is the fourth gear, 8 is the fifth gear, 9 is the sixth gear, 10 is a ring, 11 is the first rack, 12 is the second rack, 13 is the first bearing, 14 is the second bearing, 15 is the third bearing, 16 is the fourth bearing, 17 is the first axle, 18 is the second axle, 19 is the third axle, 20 is the fourth axle, 21 is the rubber-coated fixing seat, 22 is the motor, 23 is the turntable, 24 is the output screw, 25 is the third rack, and 26 is the bearing seat. DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0025] For the convenience of description, unless otherwise specified, the up and down directions mentioned below are the same as Figure 1 The up and down directions are consistent with the Figure 1 The left and right directions are consistent.

[0026] like Figures 1 to 5 As shown, this embodiment provides a transmission device for a tailgate support rod of an automobile, comprising a first housing 1 having a first cavity, a motor 22, a first gear 4 connected to the rotating shaft of the motor 22, a second gear 5 meshing with the first gear 4, a turntable 23, a third gear 6 fixed to the turntable 23 and coaxially rotating with the turntable 23, a double gear meshing with the third gear 6, a sixth gear 9 meshing with the double gear, and an output screw 24 connected to the sixth gear 9. The rotating shaft of the motor 22 is fixedly connected to the first gear 4 and rotates synchronously. The first gear 4 drives the second gear 5 to rotate.

[0027] The motor 22, the first gear 4, the turntable 23, and the third gear 6 are arranged in sequence along a first predetermined straight line direction, and the rotating shaft of the motor 22, the first gear 4, the turntable 23, and the third gear 6 all rotate coaxially; the sixth gear 9 and the output screw 24 are arranged in sequence along a second predetermined straight line direction, and the sixth gear 9 and the output screw 24 rotate coaxially; the first predetermined straight line direction and the second predetermined straight line direction are arranged at intervals from left to right, and the first predetermined straight line direction and the second predetermined straight line direction are parallel.

[0028] A circular ring 10 is fixed on the inner wall of the first cavity, and the circular ring 10 is fixed in the first cavity. The first gear 4 and the second gear 5 are both located in the area surrounded by the circular ring 10. A first rack 11 meshing with the second gear 5 is provided on the inner circumferential side of the circular ring 10. A first axle 17 is provided on the turntable 23, and the second gear 5 is mounted on the first axle 17. The double gear has a fourth gear 7 and a fifth gear 8 that rotate coaxially. The fourth gear 7 and the fifth gear 8 are integrally formed to ensure that the fourth gear 7 and the fifth gear 8 rotate synchronously. The fourth gear 7 meshes with the third gear 6, and the fifth gear 8 meshes with the sixth gear 9. The first shell 1 is fixed and the circular ring 10 is fixed on the inner wall of the first cavity. The motor 22 drives the first gear 4 to rotate, so that the second gear 5 rotates while rotating along the first rack 11 and around the circumference of the first gear 4. The circumferential rotation of the second gear 5 around the first gear 4 drives the turntable 23, which in turn drives the third gear 6. The third gear 6, through the double gears, drives the sixth gear 9, which in turn drives the output screw 24. The tailgate support rod can be mounted on the output screw 24 using a nut block, enabling automatic opening and closing of the tailgate. After the reduction gears of the first gear 4, the second gear 5, and the turntable 23, the reduction ratio of the third gear 6 to the first gear 4 is approximately 5.1.

[0029] Specifically, in one embodiment, the ring 10 is installed on the inner wall of the first cavity of the first shell 1 by interference fit, rib position limiting, laser welding, etc. The ring 10 serves to stabilize the first gear 4 and the second gear 5.

[0030] Specifically, in one embodiment, there are multiple second gears 5 and multiple first axles 17, each corresponding to one another. The multiple second gears 5 are evenly distributed along the circumference of the first gear 4, and all of the second gears 5 are meshed with the first gear 4. The multiple second gears 5 and the multiple first axles 17 are evenly distributed along the circumference of the first gear 4, and all of the second gears 5 are simultaneously meshed with the first gear 4 and the first rack 11. All of the second gears 5 rotate around the circumference of the first gear 4 while rotating on their own.

[0031] Specifically, in one embodiment, each first axle 17 may be mounted with a plurality of second gears 5. The plurality of second gears 5 on each first axle 17 are sequentially arranged along the axis of the first axle 17.

[0032] Specifically, in one embodiment, the first predetermined linear direction and the second predetermined linear direction are parallel and opposite. The rotating shaft of the motor 22, the first gear 4, the rotating disk 23, and the third gear 6 are all coaxial, and the sixth gear 9 rotates coaxially with the output screw 24, forming a parallel axis transmission. The rotating shaft of the motor 22, the first gear 4, the rotating disk 23, and the third gear 6 drive from bottom to top, while the sixth gear 9 and the output screw 24 drive from top to bottom. This structure is reasonable and compact, saving installation space for the transmission device.

[0033] Specifically, in one embodiment, the transmission device for the tailgate support rod of an automobile further includes a second shell 2 having a second cavity; the second shell 2 is connected to the first shell 1, the second cavity is communicated with the first cavity, a first bearing 13 is installed in the first cavity, and a second axle 18 is fixed on the third gear 6 and rotates coaxially with the third gear 6. The lower end of the second axle 18 is fixedly connected to the third gear 6 and rotates coaxially, and the upper end of the second axle 18 is rotatably mounted on the first bearing 13.

[0034] Specifically, in one embodiment, the first bearing 13 is an oil-containing bearing. The oil-containing bearing adopts a pressing process to increase the lubrication factor. Therefore, the oil-containing bearing carries its own lubricating oil, which plays a role in stabilizing the operation of the gear.

[0035] Specifically, in one embodiment, the turntable 23, the third gear 6, and the second axle 18 are integrally formed to ensure the strength of coaxial rotation.

[0036] Specifically, in one embodiment, a third axle 19 is also installed in the first cavity, the fourth gear 7 and the fifth gear 8 are both installed on the third axle 19 and are both located in the first cavity, the third axle 19 is arranged from top to bottom, and the fourth gear 7 is located below the fifth gear 8.

[0037] Specifically, in one embodiment, a second bearing 14 is further installed in the first cavity, a fourth axle 20 is fixed to the sixth gear 9 and rotates coaxially with the sixth gear 9 , and the fourth axle 20 is rotatably installed on the second bearing 14 .

[0038] Specifically, in one embodiment, the second bearing 14 is an oil-containing bearing to ensure stable operation of the sixth gear 9 .

[0039] Specifically, in one embodiment, the fourth axle 20 and the sixth gear 9 are integrally formed to ensure transmission strength.

[0040] Specifically, in one embodiment, a rod hole is provided on the fourth axle 20, a second rack 12 is provided on the inner wall of the rod hole, a third rack 25 is provided on the upper end of the output screw 24 and meshes with the second rack 12, the output screw 24 is installed in the rod hole of the fourth axle 20 through the meshing of the second rack 12 and the third rack 25, and the fourth axle 20 is connected to the output screw 24 through the rod hole.

[0041] Specifically, in one embodiment, the transmission device for the tailgate support rod of an automobile further includes a third shell 3 having a third cavity; the third shell 3 is connected to the first shell 1, the third cavity is communicated with the first cavity, a third bearing 15 is installed in the third cavity, the upper end of the fourth wheel shaft 20 is rotatably mounted on the second bearing 14, the lower end of the fourth wheel shaft 20 is rotatably mounted on the third bearing 15, and the output screw 24 is installed in the third cavity.

[0042] Specifically, in one embodiment, the third bearing 15 is an oil-containing bearing, which is mounted in the third cavity via a mounting seat, and the mounting seat and the third bearing 15 are press-fitted to form an assembly. The mounting seat effectively protects the stability of the third bearing 15 and the sixth gear 9.

[0043] Specifically, in one embodiment, a rubber-coated fixing seat 21 is installed in the third cavity, and the fourth bearing 16 is installed on the rubber-coated fixing seat 21 .

[0044] Specifically, in one embodiment, a fourth bearing 16 is further installed in the third cavity, and the fourth bearing 16 is sleeved on the output screw 24. The output screw 24 and the fourth bearing 16 are first fixed by a retaining spring or combined into one by interference fit to prevent the output screw 24 from radial movement.

[0045] Specifically, in one embodiment, the diameter of the fourth gear 7 is smaller than the diameter of the fifth gear 8. The fourth gear 7 and the fifth gear 8 rotate at the same speed. By utilizing the difference in the number of teeth of the fourth gear 7 and the third gear 6, a speed reduction ratio of approximately 2.07 is achieved. By utilizing the difference in the number of teeth of the fifth gear 8 and the sixth gear 9, a speed reduction ratio of approximately 2.07 is achieved.

[0046] Specifically, in one embodiment, the motor 22 is located in the second cavity and is fixed in the second cavity of the second housing 2 by screws to protect the motor 22 from being hit by foreign objects.

[0047] Specifically, in one embodiment, the first housing 1 includes an upper cover and a lower cover. The upper cover has a first groove, and the lower cover has a second groove. The inner wall of the first groove and the inner wall of the second groove together enclose a first cavity. A bearing seat 26 is provided on the inner wall of the first groove of the upper cover, and a mounting hole is provided therein. The first bearing 13 is mounted in the mounting hole.

[0048] Specifically, in one embodiment, the first gear 4 and the second gear 5 are both helical gears. Helical gears not only have good meshing characteristics, smooth transmission, and low noise, but also have a large overlap, which reduces the load on each pair of gears, improves the bearing capacity of the gears, and has a small minimum number of teeth to avoid root cutting.

[0049] Specifically, in one embodiment, the diameter of the sixth gear 9 is greater than the diameter of the fifth gear 8, thereby achieving secondary reduction.

[0050] The working principle of the present invention is as follows: the motor drives the first gear, causing the second gear to rotate simultaneously along the first rack and around the circumference of the first gear. The second gear's rotation around the circumference of the first gear drives the turntable, achieving speed reduction. The turntable drives the third gear, which in turn drives the sixth gear via a double gear. The sixth gear then drives the output screw. The meshing of the sixth and fifth gears achieves secondary speed reduction. The tailgate support rod can be mounted on the output screw using a nut block, enabling automatic opening and closing of the tailgate.

[0051] The transmission device of the present invention achieves a 1:22 speed reduction ratio through the first, second, third, double, and sixth gears. Different speed reduction ratios can be achieved by adjusting the parameters of the individual gears during assembly. Existing tailgate strut transmission mechanisms typically utilize dual-motor struts or low-end pneumatic struts to support the tailgate. This application utilizes a single-motor solution, significantly reducing costs and improving factory efficiency. It also better addresses the issue of dual-motor tailgates prone to deformation and free-floating after prolonged opening and closing.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A transmission device for a tailgate support rod of an automobile, characterized in that: The invention comprises a first shell having a first cavity, a motor, a first gear connected to a rotating shaft of the motor, a second gear meshing with the first gear, a turntable, a third gear fixed to the turntable and rotating coaxially with the turntable, a double gear meshing with the third gear, a sixth gear meshing with the double gear, and an output screw connected to the sixth gear; the motor, the first gear, the turntable, and the third gear are arranged in sequence along a first predetermined linear direction, and the rotating shaft of the motor, the first gear, the turntable, and the third gear all rotate coaxially; the sixth gear and the output screw are arranged in sequence along a second predetermined linear direction, and the sixth gear rotate coaxially with the output screw; the first predetermined linear direction is parallel to the second predetermined linear direction; A circular ring is fixed on the inner wall of the first cavity, and the first gear and the second gear are both located in the area surrounded by the circular ring. A first rack meshing with the second gear is provided on the inner circumferential side of the circular ring. A first axle is provided on the turntable, and the second gear is mounted on the first axle. The double gear has a fourth gear and a fifth gear that rotate coaxially, the fourth gear meshing with the third gear, and the fifth gear meshing with the sixth gear; The diameter of the fourth gear is smaller than the diameter of the fifth gear; A diameter of the sixth gear is greater than a diameter of the fifth gear.

2. The transmission device for a tailgate support rod of an automobile according to claim 1, characterized in that: It also includes a second shell having a second cavity; the second shell is connected to the first shell, the second cavity is communicated with the first cavity, a first bearing is installed in the first cavity, a second axle is fixed on the third gear and rotates coaxially with the third gear, and the second axle is rotatably mounted on the first bearing.

3. The transmission device for a tailgate support rod of an automobile according to claim 2, characterized in that: A third axle is further installed in the first cavity, the fourth gear and the fifth gear are both installed on the third axle, and the fourth gear and the fifth gear are both located in the first cavity.

4. The transmission device for a tailgate support rod of an automobile according to claim 3, characterized in that: A second bearing is further installed in the first cavity. A fourth axle is fixed on the sixth gear and rotates coaxially with the sixth gear. The fourth axle is rotatably installed on the second bearing.

5. The transmission device for a tailgate support rod of an automobile according to claim 4, characterized in that: A rod hole is provided on the fourth axle, a second rack is provided on the inner wall of the rod hole, a third rack is provided on the upper ring of the output screw and meshes with the second rack, and the output screw is installed in the rod hole of the fourth axle through the meshing of the second rack and the third rack.

6. The transmission device for a tailgate support rod of an automobile according to claim 5, characterized in that: It also includes a third shell having a third cavity; the third shell is connected to the first shell, the third cavity is communicated with the first cavity, the third cavity is installed with a third bearing, one end of the fourth wheel shaft is rotatably mounted on the second bearing, the other end of the fourth wheel shaft is rotatably mounted on the third bearing, and the output screw is installed in the third cavity.

7. The transmission device for a tailgate support rod of an automobile according to claim 6, characterized in that: A fourth bearing is also installed in the third cavity, and the fourth bearing is sleeved on the output screw.

8. The transmission device for a tailgate support rod of an automobile according to claim 2, characterized in that: The motor is located in the second cavity.

9. A transmission device for a tailgate support rod of an automobile according to any one of claims 1 to 8, characterized in that: There are multiple second gears and multiple first axles, and the multiple first axles correspond to the multiple second gears one by one. The multiple second gears are evenly distributed along the circumference of the first gear, and the multiple second gears are all meshed with the first gear.

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