Staggered cross shaft type universal coupling for electric supporting rod of automobile tail door

Abstract

The utility model discloses a staggered cross shaft type universal coupling for an electric supporting rod of an automobile tail door, which comprises a reduction gearbox shell, a copper sleeve is fixedly connected in the reduction gearbox shell, a secondary planet carrier is arranged in the copper sleeve, a sleeve is arranged at one end of the secondary planet carrier, and the sleeve comprises an inner spline sleeve; the second-stage planet carrier and the inner spline sleeve are connected with a mandrel, one end of the mandrel and the second-stage planet carrier are connected with a first pin shaft, the other end of the mandrel and the inner spline sleeve are connected with a second pin shaft, the staggered cross shaft type universal coupling for the automobile tail door electric supporting rod is compact in structure and small in occupied space, and the NVH of the tail door supporting rod is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology. Specifically, this utility model relates to an interlaced cross shaft universal coupling for an electric tailgate strut of an automobile. Background Technology

[0002] Electric tailgate struts are a common feature in modern cars. Driven by a built-in motor, the struts allow users to automatically open and close the tailgate simply by pressing a button or using a sensor.

[0003] With the increasing popularity of electric tailgate struts for automobiles, some problems have emerged that urgently need to be addressed. Currently, NVH issues are prevalent with electric struts. Noise is generated during operation due to the misalignment between the rotation center of the reducer output end and the rotation center of the lead screw. Furthermore, the limited axial and radial space of the electric strut makes it difficult to install sound insulation components, thus restricting the optimization of NVH issues.

[0004] Utility model patent CN 220668178U, published on March 26, 2024, discloses a coupling for a car tailgate strut, comprising a driving member and a driven member. One end of the driving member is provided with a spline for connecting to a reducer; one end of the driven member is provided with a spline groove for connecting to a lead screw; the other ends of the driving member and the other end of the driven member are engaged or disengaged through axial movement. However, this car tailgate strut coupling does not solve the aforementioned technical problem. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a cross-shaft universal coupling for electric tailgate struts of automobiles that is compact in structure, occupies little space, and effectively improves the NVH of tailgate struts.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This type of interlocking cross-shaft universal coupling for electric tailgate struts of automobiles includes a gearbox housing, a copper sleeve fixedly connected inside the gearbox housing, a secondary planetary carrier inside the copper sleeve, a sleeve at one end of the secondary planetary carrier, the sleeve including an inner spline sleeve; a spindle connects the secondary planetary carrier and the inner spline sleeve, one end of the spindle is connected to the secondary planetary carrier by a first pin, and the other end of the spindle is connected to the inner spline sleeve by a second pin.

[0008] The mandrel has elongated holes at both ends, and the first pin and the second pin are respectively located in the elongated holes at both ends of the mandrel.

[0009] The mandrel includes an outer cylindrical surface, the secondary planetary carrier includes a rotation center hole, and there is a gap between the outer cylindrical surface and the inner wall of the rotation center hole. The inner spline sleeve includes a tooth tip cylindrical surface, and there is a gap between the outer cylindrical surface and the tooth tip cylindrical surface.

[0010] Rubber rings are fitted at both ends of the first pin and both ends of the second pin, and the rubber rings are located in the gap.

[0011] The secondary planetary carrier is provided with a first pin hole, and the two ends of the first pin extend out of the elongated hole and are interference-fitted with the first pin hole. The inner spline sleeve is provided with a second pin hole, and the two ends of the second pin extend out of the elongated hole and are interference-fitted with the second pin hole.

[0012] The first pin and the second pin are arranged in a cross shape.

[0013] One end of the inner spline sleeve is connected to the second pin, and the other end is connected to a lead screw. The lead screw and the inner spline sleeve are engaged by a spline, and a bearing is provided on the lead screw.

[0014] The gearbox housing is provided with a positioning step, and the end of the copper sleeve is provided with a flange, which contacts the positioning step.

[0015] Both the first and second pins have chamfered ends.

[0016] The technical advantages of this utility model are as follows: The interlaced cross-shaft universal coupling for electric tailgate struts of automobiles has an elongated hole on the spindle to provide swing space for the pin. Gaps are also provided between the outer cylindrical surface of the spindle and the top cylindrical surface of the inner spline sleeve, as well as between the rotation center hole of the secondary planetary carrier. This allows the spindle to swing when the outer spline shaft of the lead screw and the rotation axis of the secondary planetary carrier are not aligned. The rubber ring on the pin further avoids contact noise between the spindle and the inner spline sleeve or the secondary planetary carrier, effectively improving the NVH problem of the strut. The coupling has a reasonable structural design, with the advantages of compact structure and small size, and can connect two shafts with a large distance between their ends and a small radial dimension space. Attached Figure Description

[0017] This manual includes the following figures, which illustrate the following:

[0018] Figure 1 This is a sectional view of the electric strut interlaced cross shaft universal coupling of this utility model;

[0019] Figure 2 This is a schematic diagram of the coupling when the lead screw of this utility model is in the extreme swing position;

[0020] Figure 3 This is a schematic diagram of the coupling when the lead screw of this utility model is in the extreme swing position in another direction;

[0021] Figure 4 This is a schematic diagram of the gearbox housing and copper sleeve of this utility model;

[0022] Figure 5 This is a schematic diagram of the secondary planetary carrier of this utility model;

[0023] Figure 6 This is a schematic diagram of the pin and rubber ring of this utility model;

[0024] Figure 7 This is a schematic diagram of the mandrel of this utility model;

[0025] Figure 8 This is a schematic diagram of the inner spline sleeve of this utility model;

[0026] Figure 9 This is a schematic diagram of the lead screw and bearing of this utility model;

[0027] Figure 10 This is a simplified schematic diagram of the interlaced cross shaft universal coupling of this utility model.

[0028] The markings in the diagram are as follows: 1. Gearbox housing; 2. Copper sleeve; 3. Secondary planetary carrier; 4. Rubber ring; 5. Spindle; 6. Long hole; 7. Lead screw; 8. Inner spline sleeve; 9. First pin; 10. Second pin; 11. First pin hole; 12. Second pin hole; 13. Positioning step; 14. Flange; 15. Outer cylindrical surface; 16. Rotation center hole; 17. Bearing; 18. External spline; 19. Sleeve. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this utility model, and to facilitate its implementation.

[0030] like Figures 1 to 3 As shown, the interlaced cross-shaft universal coupling for an electric tailgate strut includes a gearbox housing 1. A copper sleeve 2 is fixedly connected inside the gearbox housing 1. A secondary planetary carrier 3 is housed inside the copper sleeve 2. One end of the secondary planetary carrier 3 has a sleeve 19, which includes an inner spline sleeve 8. A spindle 5 connects the secondary planetary carrier 3 and the inner spline sleeve 8. One end of the spindle 5 is connected to the secondary planetary carrier 3 by a first pin 9, and the other end of the spindle 5 is connected to the inner spline sleeve 8 by a second pin 10. The copper sleeve 2 is injection molded inside the gearbox housing 1. The secondary planetary carrier 3 is installed inside the copper sleeve 2 and can rotate within the copper sleeve 2. The torque between the secondary planetary carrier 3 and the inner spline sleeve 8 is transmitted through the spindle 5 and the two pins.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, both ends of the spindle 5 are provided with elongated holes 6, and the first pin 9 and the second pin 10 are respectively located in the elongated holes 6 at both ends of the spindle 5. The spindle 5 has elongated holes 6 at both ends through which the pins can pass. When the outer spline 18 shaft of the lead screw 7 is not aligned with the rotation axis of the secondary planetary carrier 3, the pin can rotate or swing within the elongated holes 6 of the spindle 5. This allows the spindle 5 to bear the swing effect, compensating for larger angles of axial misalignment. This improves the coaxiality of the lead screw 7, reduces the impact of the swing of the lead screw 7 or the secondary planetary carrier 3 on the drive device, and extends the service life of the tailgate electric strut and its drive components. The first pin 9 and the second pin 10 have the same specifications. The length of the elongated hole 6 is greater than the outer diameter of the pin, and the width of the hole matches the outer diameter of the pin. Furthermore, the cross-section of the elongated hole 6 has an oblong shape, which helps reduce stress concentration. The mandrel 5 can be made of non-metallic parts or metal-coated plastic parts. A soft rubber pad can also be placed inside the elongated hole 6 of the mandrel 5 to prevent noise caused by the pins colliding with each other when moving within the elongated hole 6. The end of the pin does not protrude from the pin hole, avoiding spatial interference and preventing any impact on the connection and fastening effect. The structure is compact and occupies little space.

[0032] like Figures 1 to 3 As shown, the spindle 5 includes an outer cylindrical surface 15, and the secondary planetary carrier 3 includes a rotation center hole 16. A gap is provided between the outer cylindrical surface 15 and the inner wall of the rotation center hole 16. The inner spline sleeve 8 includes a tooth tip cylindrical surface, and a gap is provided between the outer cylindrical surface 15 and the tooth tip cylindrical surface. Gaps are provided between the outer cylindrical surface 15 of the spindle 5, the tooth tip cylindrical surface of the inner spline sleeve 8, and the rotation center hole 16 of the secondary planetary carrier 3. When the outer spline 18 shaft of the lead screw 7 is not aligned with the rotation axis of the secondary planetary carrier 3, the spindle 5 can swing within the inner spline sleeve 8 or within the rotation center hole 16 of the secondary planetary carrier 3. This provides sufficient space for the swinging process of the spindle 5, preventing contact between the spindle 5 and the pin shaft with the inner spline sleeve 8 or the secondary planetary carrier 3 during swinging, thereby reducing the probability of noise generation and improving the NVH performance of the tailgate electric strut.

[0033] like Figures 1 to 3 As shown, rubber rings 4 are fitted at both ends of the first pin 9 and both ends of the second pin 10, with the rubber rings 4 located within the gap. The rubber rings 4 separate the outer cylindrical surfaces 15 and the tooth tip cylindrical surfaces of the inner spline sleeve 8 at both ends of the mandrel 5, as well as the inner wall of the rotation center hole 16 of the secondary planetary carrier 3, keeping the mandrel 5 in the middle position of the pins. This prevents noise from generated when the mandrel 5 moves or swings within the hole of the inner spline sleeve 8 or the rotation center hole 16 of the secondary planetary carrier 3.

[0034] like Figure 5 and Figure 8As shown, the secondary planetary carrier 3 has a first pin hole 11, and the two ends of the first pin shaft 9 extend out of the elongated holes 6 and are interference-fitted with the first pin hole 11. The inner spline sleeve 8 has a second pin hole 12, and the two ends of the second pin shaft 10 extend out of the elongated holes 6 and are interference-fitted with the second pin hole 12. The secondary planetary carrier 3 is connected to the mandrel 5 by the first pin shaft 9 passing through the elongated holes 6 of the mandrel 5. The ends of the pin shafts are riveted into the pin holes of the secondary planetary carrier 3 by interference fit. The inner spline sleeve 8 is connected to the mandrel 5 by the second pin shaft 10 passing through the elongated holes 6 of the mandrel 5. The ends of the pin shafts are riveted into the pin holes of the inner spline sleeve 8 by interference fit. The pin shafts use an interference fit to connect the two ends of the mandrel 5 to the secondary planetary carrier 3 and the inner spline sleeve 8 respectively, without the need for additional connecting parts, saving assembly space and meeting the compact space layout requirements of the tailgate electric strut. At the same time, it ensures good alignment between the pin shaft and the pin hole, reliable fastening and coaxiality, reduces vibration and noise during operation, and can withstand large radial and axial loads.

[0035] like Figure 10 As shown, the first pin 9 and the second pin 10 are arranged in a cross shape. The two pins are located at opposite ends of the spindle 5, allowing connection between two shafts with a large distance between their ends and limited radial space. This accommodates the limited axial and radial space required for components in the tailgate electric strut. The spacing between the two pins expands the swing space of the spindle 5, improving the swing resistance of the tailgate electric strut and enabling the transmission of larger torques. The cross-shaped arrangement of the two pins ensures smooth torque transmission and improves the efficiency and stability of torque transmission.

[0036] like Figure 10 As shown, one end of the inner spline sleeve 8 is connected to the second pin 10, and the other end is connected to the lead screw 7. The lead screw 7 and the inner spline sleeve 8 are connected by a spline, and the lead screw 7 is equipped with a bearing 17. The end of the lead screw 7 is provided with an external spline 18, which cooperates with the internal spline structure of the inner spline sleeve 8 to realize torque transmission. That is, one end of the inner spline sleeve 8 is connected to the spindle 5 through a pin, and the other end is connected to the lead screw 7 through a spline. The lead screw 7 is installed on the bearing seat by riveting and cooperating with the bearing 17, which provides support for the rotation of the lead screw 7.

[0037] like Figure 4 As shown, the gearbox housing 1 is provided with a positioning step 13, and the end of the copper sleeve 2 is provided with a flange 14, which contacts the positioning step 13. The contact between the flange 14 and the positioning step 13 realizes the axial positioning of the copper sleeve 2, which facilitates the installation of the copper sleeve 2 and ensures that it is installed in place.

[0038] like Figure 6 As shown, both the first pin 9 and the second pin 10 have chamfered ends. The chamfer facilitates the installation of the pins, reduces obstruction during their passage through the elongated hole 6 and the connecting pin hole, and improves assembly efficiency.

[0039] During the use of the tailgate electric strut: because there is a gap between the outer cylindrical surface 15 of the spindle 5 and the top cylindrical surface of the inner spline sleeve 8 or between the rotation center hole 16 of the secondary planetary carrier 3, when the outer spline 18 shaft of the lead screw 7 is not aligned with the rotation axis of the secondary planetary carrier 3, the spindle 5 can swing within the inner spline sleeve 8; when the outer spline 18 shaft of the lead screw 7 is not aligned with the rotation axis of the secondary planetary carrier 3, the spindle 5 can swing within the rotation center hole 16 of the secondary planetary carrier 3; and both ends of the two pins are fitted with rubber rings 4, which separate the outer cylindrical surface 15 of the spindle 5 and the top cylindrical surface of the inner spline sleeve 8 or between the rotation center hole 16 of the secondary planetary carrier 3, keeping the spindle 5 in the middle position of the pins. When the spindle 5 moves or swings within the hole of the inner spline sleeve 8 or within the rotation center hole 16 of the secondary planetary carrier 3, the above-mentioned components are prevented from contacting each other and generating noise.

[0040] This interlaced cross-shaft universal coupling for electric tailgate struts of automobiles features an elongated hole 6 on the spindle 5, providing space for the pivot pin. Gaps are also provided between the outer cylindrical surface 15 of the spindle 5 and the top cylindrical surface of the inner spline sleeve, as well as between the rotation center hole 16 of the secondary planetary carrier 3. This allows the spindle 5 to swing when the outer spline 18 shaft of the lead screw 7 and the rotation axis of the secondary planetary carrier 3 are misaligned. A rubber ring 4 fitted on the pin further prevents contact noise between the spindle 5 and the inner spline sleeve 8 or the secondary planetary carrier 3, effectively improving the NVH (noise, vibration, and harshness) of the strut. The coupling has a reasonable structural design, is compact, and small in size, and can connect two shafts with a large distance between their ends and a small radial dimension.

[0041] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A cross-shaft universal coupling for an electric tailgate strut of an automobile, characterized in that: The gearbox includes a gearbox housing (1), a copper sleeve (2) is fixedly connected inside the gearbox housing (1), a secondary planetary carrier (3) is provided inside the copper sleeve (2), a sleeve (19) is provided at one end of the secondary planetary carrier (3), the sleeve (19) includes an inner spline sleeve (8); a spindle (5) is connected between the secondary planetary carrier (3) and the inner spline sleeve (8), a first pin (9) is connected to one end of the spindle (5) and a second pin (10) is connected to the inner spline sleeve (8).

2. The interlaced cross-shaft universal coupling for an electric tailgate strut as described in claim 1, characterized in that: The mandrel (5) has elongated holes (6) at both ends, and the first pin (9) and the second pin (10) are respectively located in the elongated holes (6) at both ends of the mandrel (5).

3. The interlaced cross-shaft universal coupling for an electric tailgate strut as described in claim 1 or 2, characterized in that: The mandrel (5) includes an outer cylindrical surface (15), the secondary planetary carrier (3) includes a rotation center hole (16), and there is a gap between the outer cylindrical surface (15) and the inner wall of the rotation center hole (16). The inner spline sleeve (8) includes a tooth tip cylindrical surface, and there is a gap between the outer cylindrical surface (15) and the tooth tip cylindrical surface.

4. The interlaced cross-shaft universal coupling for an electric tailgate strut as described in claim 3, characterized in that: Rubber rings (4) are fitted on both ends of the first pin (9) and both ends of the second pin (10), and the rubber rings (4) are located in the gap.

5. The interlaced cross-shaft universal coupling for an electric tailgate strut as described in claim 4, characterized in that: The secondary planetary carrier (3) is provided with a first pin hole (11), and the two ends of the first pin shaft (9) extend out of the elongated hole (6) and are interference-fitted with the first pin hole (11). The inner spline sleeve (8) is provided with a second pin hole (12), and the two ends of the second pin shaft (10) extend out of the elongated hole (6) and are interference-fitted with the second pin hole (12).

6. The interlaced cross-shaft universal coupling for an electric tailgate strut of an automobile as described in claim 5, characterized in that: The first pin (9) and the second pin (10) are arranged in a cross shape.

7. The interlaced cross-shaft universal coupling for an electric tailgate strut according to any one of claims 1-6, characterized in that: One end of the inner spline sleeve (8) is connected to the second pin (10), and the other end is connected to the lead screw (7). The lead screw (7) and the inner spline sleeve (8) are engaged by splines. The lead screw (7) is provided with a bearing (17).

8. The interlaced cross-shaft universal coupling for an electric tailgate strut of an automobile as described in claim 1, characterized in that: The gearbox housing (1) is provided with a positioning step (13), and the end of the copper sleeve (2) is provided with a flange (14), which contacts the positioning step (13).

9. The interlaced cross-shaft universal coupling for an electric tailgate strut of an automobile as described in claim 1, characterized in that: Both the first pin (9) and the second pin (10) have chamfered ends.

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