Flexible shaft parallel transmission electric supporting rod

Abstract

The utility model discloses a flexible shaft parallel transmission electric supporting rod which comprises a supporting rod body, the supporting rod body is provided with a screw rod, a transmission pipe, a guide sleeve, a spring and a gear assembly, the gear assembly is arranged at the end, close to the tail portion, of the supporting rod body, and the guide sleeve is coaxially arranged on the periphery of the screw rod in a sleeved mode; the periphery of the guide sleeve and the periphery of the transmission pipe are sleeved with the spring. A driving motor; the flexible shaft and the supporting rod main body are arranged in parallel, one end of the flexible shaft is connected with the driving motor, the other end of the flexible shaft is connected with the screw rod through the gear assembly, and the supporting rod main body is stretched or shortened. The supporting rod body and the electric supporting rod can be installed at different positions of an automobile and connected through the flexible shaft, the length of the supporting rod body is reduced, limitation of installation space is small, and the application range of installation of the electric supporting rod is larger.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and in particular relates to a flexible shaft parallel transmission electric strut. Background Art

[0002] At present, the trunk door or hood of a car is generally equipped with an electric spring strut, which uses a motor to drive a screw as a power output to achieve the purpose of reciprocating motion of the strut, thereby realizing the lifting and opening and closing functions of the trunk door or hood of the car.

[0003] With the continuous improvement of automobile intelligence, the installation environment of electric struts has become more stringent, mainly in the following two aspects:

[0004] 1. The popularity of through-type taillights and the continuous decline of models with electric rear wings have made the installation space of electric struts smaller and smaller;

[0005] 2. The use of electric struts is no longer limited to the tailgate. Electric struts can also be used on the hood, trunk lid, side doors, etc. These scenarios provide even smaller installation space for the electric struts.

[0006] For example, a Chinese patent with application number CN201820518975.7 discloses an electric strut, including an outer sleeve, a fixed head arranged at the end of the outer sleeve, and a motor, a reducer, a damper and a screw drive assembly arranged inside the outer sleeve; the reducer includes a worm wheel and a worm, and the power output end of the motor is connected to the worm to drive the worm wheel to rotate; the screw drive assembly includes a screw, which is connected to the worm wheel and linked with the worm wheel; the electromagnetic damper includes a damping shell, the damping shell is provided with a plurality of first axial protrusions, the motor or the reducer is provided with a plurality of first fixed grooves, and the axial protrusions are inserted into the first fixed grooves.

[0007] However, the driving mechanism of this technical solution is coaxially arranged in series at the end of the strut body, which makes the overall length of the electric strut relatively large. Due to the limitation of the installation space of the car, it is difficult to arrange and install the electric strut at the corresponding position.

[0008] Therefore, an electric strut with a shorter length but the same performance is needed to meet the above usage environment. Utility Model Content

[0009] In order to solve the above technical problems, the utility model changes the rigid transmission between the driving motor and the screw rod into a flexible transmission, thereby greatly reducing the fixed length of the electric strut and improving the installability of the electric strut.

[0010] The utility model adopts the following technical solutions:

[0011] A flexible shaft parallel transmission electric strut, comprising:

[0012] A support rod body, the support rod body having a screw rod, a transmission tube, a guide sleeve, a spring and a gear assembly, the gear assembly being arranged at one end of the support rod body close to the tail, and the guide sleeve being coaxially sleeved on the outer periphery of the screw rod;

[0013] The spring sleeve is arranged on the outer periphery of the guide sleeve and the transmission tube;

[0014] Drive motor;

[0015] A flexible shaft is arranged in parallel with the support rod body, one end of the flexible shaft is connected to the driving motor, and the other end of the flexible shaft is connected to the screw rod through the gear assembly;

[0016] The driving motor drives the flexible shaft to perform radial rotational motion, and the flexible shaft transmits power to the screw rod through the gear assembly. When the screw rod rotates, the transmission tube slides axially close to the inner wall of the guide sleeve, and the support rod body is extended or shortened.

[0017] Furthermore, the gear assembly includes an intermediate gear, a driven gear sleeved on the outer periphery of the screw, and a driving gear connected to the end of the flexible shaft, and the driving gear and the driven gear are respectively meshed with the intermediate gear.

[0018] Furthermore, the gear assembly has a protective shell, and a guide sleeve is provided on the side of the protective shell.

[0019] Furthermore, a damper is arranged in the protective shell, and the damper is sleeved on the outer periphery of the screw.

[0020] Furthermore, the head and tail of the support rod body are respectively provided with a sliding joint and a fixed joint, the sliding joint is connected to the end of the transmission pipe, and the fixed joint is connected to the side of the protective shell.

[0021] Furthermore, a mounting seat is provided on the driving motor.

[0022] Furthermore, the driving motor is also connected to a wiring harness, and a fixing clamp is provided on the wiring harness.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The electric strut has improved the power transmission mode, separating the drive motor from the strut body. The two can be installed in different parts of the car. The two are connected by a flexible shaft, which reduces the length of the strut body. Since the drive motor and the strut body are two completely independently installed components, the volume of the strut body is relatively small. When installing the electric strut, the drive motor and the strut body are installed in different parts of the car. In this way, the electric strut is less restricted by the installation space and has a wider application range.

[0025] The electric strut has been shortened to significantly increase radial strength and enhance durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a flexible shaft parallel transmission electric strut of the utility model;

[0027] Figure 2 This is a schematic cross-sectional structural diagram of the entire support rod body in an embodiment of the utility model;

[0028] Figure 3 This is a cross-sectional structural diagram of a gear assembly in an embodiment of the utility model;

[0029] Figure 4 It is a schematic cross-sectional structure diagram of a part of the support rod body in the embodiment of the utility model;

[0030] Figure 5 It is a three-dimensional structural schematic diagram of the guide sleeve and the transmission tube in the embodiment of the utility model;

[0031] The reference numerals in the drawings of the specification include:

[0032] The support rod body 1, the screw rod 10, the transmission tube 11, the transmission nut 110, the guide sleeve 12, the keyway 120, the spring 13, the sliding joint 14, the fixed joint 15, the outer sleeve 17, the inner sleeve 18, the gear assembly 2, the driven gear 20, the intermediate gear 21, the driving gear 22, the protective shell 23, the damper 24, the drive motor 3, the mounting seat 30, the wiring harness 31, the fixing clamp 32, and the flexible shaft 4. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Among them, the drawings are only used for exemplary explanations, and they only show schematic diagrams rather than actual drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar parts; in the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like appear, the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, so the terms describing the positional relationship in the drawings are only used for exemplary explanations, and cannot be understood as limitations on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] like Figure 1-Figure 5 As shown, a flexible shaft parallel transmission electric strut of the utility model comprises a strut body 1, a driving motor 3 and a flexible shaft 4;

[0036] The support rod body 1 includes a screw rod 10, a transmission tube 11 and a gear assembly 2. The gear assembly 2 is arranged at one end of the support rod body 1 close to the tail.

[0037] The flexible shaft 4 is arranged in parallel with the support rod body 1, one end of the flexible shaft 4 is connected to the driving motor 3, and the other end of the flexible shaft 4 is connected to the screw 10 through the gear assembly 2;

[0038] The driving motor 3 drives the flexible shaft 4 to perform radial rotational motion, and the flexible shaft 4 transmits power to the screw 10 through the gear assembly 2, so that the transmission tube 11 slides relative to the screw 10, and the support rod body 1 is extended or shortened.

[0039] The electric strut improves the power transmission mode by separating the driving motor 3 from the strut body 1. The two can be installed in different parts of the car. On the one hand, the flexible shaft 4 is arranged side by side with the separated strut body 1, which reduces the length of the strut body 1. When arranged side by side, the two are parallel.

[0040] On the other hand, the support rod body 1 is not directly connected to the drive motor 3. The drive motor 3 and the support rod body 1 are completely independent components. The volume of the support rod body 1 is also relatively small. The drive motor 3 adopts an external design, which avoids the problem of vibration and noise generated by the traditional integrated structure of the drive motor 3 and the support rod body 1 during operation. For this reason, structural optimization for this problem is reduced during assembly.

[0041] The two use a flexible shaft 4 to transmit power. When installing the electric strut, the driving motor 3 and the strut body 1 are installed at different parts of the car, so that the installation space is less restricted. In addition, during production, the length of the flexible shaft 4 can be adjusted according to actual conditions to adapt to installation requirements.

[0042] The length of the main body 1 of the electric strut is shortened, which can greatly reduce the installation space required for the electric strut. This structure is very beneficial to the design and layout of automobiles, especially sedans, SUVs, MPV trunks and hoods.

[0043] Since the length of the electric strut main body 1 is reduced, the installation position of the electric strut is no longer limited to the electric tailgate, and can be installed on other positions such as the engine hood, the trunk lid, and the side door.

[0044] The electric strut has been shortened to significantly increase radial strength and enhance durability.

[0045] The central steel wire of the flexible shaft 4 is made of relatively high-strength steel wire, and the outer steel wire is made of relatively low-carbon-content and low-strength steel wire.

[0046] Of course, you can also use cables, torsion bars, torsion springs and other parts with flexible transmission to replace the flexible shaft 4. Due to the flexible transmission method, when the automobile installation space is complex, the flexible shaft 4 can be bent appropriately to bypass the obstruction of other automobile parts and transmit power.

[0047] This scheme uses a flexible shaft to transmit power. The central steel wire of the flexible shaft 4 is made of high-strength steel wire, and the outer steel wire is made of steel wire with low carbon content and low strength. A hose is sheathed around the steel wire.

[0048] Specifically, Figure 3 As shown, the gear assembly 2 includes an intermediate gear 21, a driven gear 20 sleeved on the outer periphery of the screw 10, and a driving gear 22 connected to the end of the flexible shaft 4, wherein the driving gear 22 and the driven gear 20 are respectively meshed with the intermediate gear 21.

[0049] The setting of the gear assembly 2 can achieve a deceleration effect, wherein an intermediate gear 21 is set in the gear assembly 2 to achieve secondary transmission of the gear assembly 2 and also increase the vertical distance between the flexible shaft 4 and the support rod body 1.

[0050] like Figure 1 As shown, a mounting seat 30 is provided on the drive motor 3 , and the drive motor 3 is fixed on the vehicle through the mounting seat 30 .

[0051] The driving motor 3 has a wiring harness 31 , the end of which is a connector. A fixing clamp 32 is provided on the wiring harness 31 , and the wiring harness 31 can be quickly fixed by the clamp during wiring.

[0052] like Figure 2 As shown, specifically, the support rod body 1 also has a sliding joint 14, a fixed joint 15, a transmission tube 11, a guide sleeve 12 and a spring 13;

[0053] Among them, the sliding joint 14 and the fixed joint 15 are respectively arranged at the head and the tail of the support rod body 1. When the support rod body 1 is installed, the sliding joint 14 and the fixed joint 15 are respectively connected to the automobile sheet metal of the parts to be opened and closed, such as the trunk of an SUV car, which is connected to the tail rack of the car by using the fixed joint 15, and one end of the sliding joint 14 is connected to the inner side of the tailgate of the car.

[0054] like Figure 4 , Figure 5 As shown, one end of the transmission tube 11 has a transmission nut 110 sleeved on the outer periphery of the screw 10, and the guide sleeve 12 is coaxially sleeved on the outer periphery of the screw 10. When the screw 10 rotates, the transmission tube 11 slides axially against the inner wall of the guide sleeve 12;

[0055] The spring 13 is located between the sliding joint 14 and the gear assembly 2, and is sleeved on the outer circumference of the guide sleeve 12 and the transmission tube.

[0056] During operation, the power passes through the gear assembly 2 to drive the driving gear 22 to rotate, and then drives the screw 10 to rotate through the intermediate gear 21 and the driven gear 20. Since the transmission nut 110 and the inner wall of the guide sleeve 12 are connected by a key, the transmission tube 11 cannot rotate together. Therefore, the transmission tube 11 slides and retracts along the inner wall of the guide sleeve 12 as the screw 10 rotates, and the spring 13 retracts and retracts at the same time, thereby realizing the automatic opening and closing of the trunk door.

[0057] Specifically, the outer periphery of the driving nut 110 has a spline, and the inner wall of the guide sleeve 12 is provided with a keyway 120 that matches the spline, and the keyway 120 extends along the length direction of the guide sleeve 12 .

[0058] In addition, if Figure 3 As shown, the gear assembly 2 has a protective shell 23. In addition to protecting the internal gears, the interior of the protective shell 23 is a mounting cavity for each gear. A damper 24 is also provided in the protective shell 23. The damper 24 is sleeved on the outer periphery of the screw 10, and the fixed joint 15 is connected to the outer side of the protective shell 23. The connection methods between the two include but are not limited to pressure riveting, rotary riveting, bonding, clamping and the like.

[0059] In addition, the support rod body 1 has an outer sleeve 17 and an inner sleeve 18 coaxially arranged, wherein the outer sleeve 17 is pressed on the protective shell 23 by the spring 13, and one end of the inner sleeve 18 is pressed on the sliding joint 14 by the spring 13. The outer sleeve 17 and the inner sleeve 18 are both sleeved on the outer periphery of the guide sleeve and the transmission tube 11. When the support rod body 1 is extended or shortened, the inner sleeve 18 slides relative to the outer sleeve 17. The outer sleeve 17 and the inner sleeve 18 play a role in protecting the internal screw 10 and the transmission tube 11.

Claims

1. A flexible shaft parallel transmission electric strut, characterized in that: include: A support rod body, the support rod body having a screw rod, a transmission tube, a guide sleeve, a spring and a gear assembly, the gear assembly being arranged at one end of the support rod body close to the tail, and the guide sleeve being coaxially sleeved on the outer periphery of the screw rod; The spring sleeve is arranged on the outer periphery of the guide sleeve and the transmission tube; Drive motor; A flexible shaft is arranged in parallel with the support rod body, one end of the flexible shaft is connected to the driving motor, and the other end of the flexible shaft is connected to the screw rod through the gear assembly; The driving motor drives the flexible shaft to perform radial rotational motion, and the flexible shaft transmits power to the screw rod through the gear assembly. When the screw rod rotates, the transmission tube slides axially close to the inner wall of the guide sleeve, and the support rod body is extended or shortened.

2. A flexible shaft parallel transmission electric strut as claimed in claim 1, characterized in that: The gear assembly comprises an intermediate gear, a driven gear sleeved on the outer periphery of the screw rod, and a driving gear connected to the end of the flexible shaft. The driving gear and the driven gear are respectively meshed with the intermediate gear.

3. A flexible shaft parallel transmission electric strut as claimed in claim 1 or 2, characterized in that: The gear assembly has a protective housing.

4. A flexible shaft parallel transmission electric strut as claimed in claim 3, characterized in that: A damper is arranged in the protective shell and is sleeved on the outer periphery of the screw rod.

5. A flexible shaft parallel transmission electric strut as claimed in claim 1, 2 or 4, characterized in that: The head and tail of the support rod body are respectively provided with a sliding joint and a fixed joint, the sliding joint is connected to the end of the transmission pipe, and the fixed joint is connected to the side of the protective shell.

6. A flexible shaft parallel transmission electric strut as claimed in claim 1, 2 or 4, characterized in that: A mounting seat is arranged on the driving motor.

7. A flexible shaft parallel transmission electric strut as claimed in claim 6, characterized in that: The driving motor is also connected to a wiring harness, and a fixing clamp is arranged on the wiring harness.

Images