CN213015917U

CN213015917U - Constant torque mechanism of automobile tail door push rod

Info

Publication number: CN213015917U
Application number: CN202021293835.8U
Authority: CN
Inventors: 魏民
Original assignee: Zhejiang Dingtong Automobile Technology Co ltd
Current assignee: Zhejiang Haofa Electronic Technology Co Ltd
Priority date: 2020-07-04
Filing date: 2020-07-04
Publication date: 2021-04-20
Anticipated expiration: 2030-07-04

Abstract

The utility model provides a invariable torque mechanism of car tail-gate push rod belongs to auto-parts technical field. The constant torque mechanism solves the technical problems of low control precision, poor stability and the like of the existing constant torque mechanism of the push rod of the automobile tail door. The automobile tail gate push rod comprises a lead screw, a housing, a motor, a nut, a push pipe and a guide pipe, the lead screw is arranged in the guide pipe, the motor is arranged in the housing, the guide pipe sleeve is arranged outside the lead screw, one end of the guide pipe is fixedly connected with the housing through the guide pipe sleeve and a positioning sleeve, the spline section of one end of the lead screw is inserted in the housing, the end of the lead screw is fixedly connected with the nut, the other end of the lead screw is in threaded connection with the nut, one end of the push pipe is fixedly connected with the nut and inserted in the guide pipe, the constant torque mechanism comprises a resistance increasing assembly and a synchronous sleeve, the synchronous sleeve is meshed and connected to the outer peripheral face of the spline. The utility model discloses stable in structure to resistance increasing part has improved this invariable torque mechanism's control accuracy through the setting.

Description

Constant torque mechanism of automobile tail door push rod

Technical Field

The utility model belongs to the technical field of auto-parts, a invariable torque mechanism of car tail-gate push rod is related to.

Background

In modern life, automobiles are important vehicles for people, and the trunk of an automobile is a part of the automobile for storing articles. At present, a mechanical locking device is adopted for a tail gate in a trunk of most automobiles, so that the structure is simple and the cost is low; but many times, the locking is not good, so that the articles are lost. Therefore, the tail gate of many high-grade automobiles adopts an electric suction system. The most important part in the electric suction system is the push rod control of the tail gate, and the push rod of the electric tail gate of the existing car directly drives a multi-head screw rod to extend and contract through gear transmission to realize the electric opening and closing of the tail gate; the extension spring on the push rod plays an auxiliary role, but the spring is seriously attenuated due to being in the maximum stretching state for a long time, so that the supporting force is insufficient after the tail gate is opened, and the situation that the tail gate falls down easily occurs. Although some vehicles are provided with dampers on push rods, the dampers are poor in effect and poor in universality, can be customized only for vehicle types, and have the defects of large size, complex structure, high cost, complex system operation, inconvenience in use and the like.

Chinese patent (publication number: CN 205577699U; publication date: 2016-09-14) discloses a car electric tail gate push rod resistor, which comprises an outer sleeve sleeved on a screw rod and a resistor increasing component, wherein the resistor increasing component is arranged in the outer sleeve and comprises an outer cover, a pressure spring, a friction gasket, a friction plate and a spline section, wherein the outer cover is arranged at one end of the outer sleeve, and the other end of the outer sleeve is connected to the motor output end of the electric tail gate push rod through the spline section; a pressure spring, a friction gasket and a plurality of friction plates are sequentially arranged between the outer cover and the outer sleeve.

The car electric tail door push rod resistor increasing device in the patent document has low control precision and poor stability, can not meet the requirement of keeping the torque of the car tail door push rod in the actual use process, and brings much inconvenience to operators.

Disclosure of Invention

The utility model discloses there is above-mentioned problem according to current technique, has provided a invariable torque mechanism of car tail-gate push rod, the utility model aims to solve the technical problem that: how to improve the control accuracy of the constant torque mechanism and enhance the stability thereof.

The purpose of the utility model can be realized through the following technical scheme:

a constant torque mechanism of a push rod of an automobile tail door comprises a lead screw, a shell, a motor, a nut, a top pipe and a guide pipe, the screw rod is arranged in the guide pipe, the motor is arranged in the shell, one end of the guide pipe is fixedly connected with the shell through a guide pipe sleeve and a positioning sleeve, one end of the screw rod is provided with a spline section which is inserted in the shell and the end part of the spline section is fixedly connected with the rotor or the output shaft of the motor, the other end of the screw rod is in threaded connection with the nut, one end of the top pipe is inserted in the guide pipe, the nut is fixedly connected with the top pipe, the constant torque mechanism is characterized by comprising a resistance increasing component and a synchronous sleeve, wherein the synchronous sleeve is connected to the peripheral surface of the spline section in a meshed mode, the resistance increasing component is sleeved on the synchronous sleeve, and the peripheral surface of the resistance increasing component is connected with the shell.

The working principle is as follows: when the mechanism is used, a power supply of the motor is switched on, the motor starts to work, and the motor drives the screw rod to rotate because a rotor or an output shaft of the motor is fixedly connected with a spline section of the screw rod, one end of the screw rod is in threaded connection with a nut, the nut is fixedly connected with the top pipe, and the screw rod drives the top pipe to rotate; the synchronous sleeve sleeved on the screw rod and positioned in the shell also starts to rotate in the rotating process of the screw rod, the synchronous sleeve drives the resistance increasing component sleeved on the synchronous sleeve to rotate, the resistance increasing component is connected with the inner wall of the shell, and the resistance increasing component is subjected to the resistance action of the inner wall of the shell in the rotating process of the resistance increasing component, so that the rotation of the screw rod connected with the resistance increasing component is limited. This invariable torque mechanism of car tail-gate push rod simple structure, assembly and maintenance are all more convenient to this mechanism produces the resistance effect through the inner wall that sets up resistance-increasing part and shell, increase and the lead screw that resistance-increasing part is connected rotates the mechanical resistance that the in-process received, so that the tail-gate push rod is used for balancing the resistance of tail-gate dead weight and can set up bigger, thereby keep the moment of torsion of tail-gate push rod invariable, and then maintain tail-gate push rod steady operation, improve work efficiency.

In the constant torque mechanism of the automobile tail door push rod, the resistance increasing assembly comprises three static friction plates, two dynamic friction plates and an elastic part, wherein the two static friction plates are arranged between the two adjacent static friction plates respectively. By adopting the structure, the contact area of the whole resistance-increasing component, the shell and the synchronous sleeve can be effectively increased.

In the constant torque mechanism of the automobile tail door push rod, the dynamic friction plate is made of a polytetrafluoroethylene composite material. The wear resistance of the dynamic friction plate is enhanced.

In the constant torque mechanism of the automobile tail door push rod, a first convex edge extending outwards is arranged on the outer edge of the static friction plate, a first positioning groove is formed in the inner wall of the outer shell, and the first convex edge is matched with the first positioning groove; and a second convex edge extending inwards is arranged at the outer edge of the dynamic friction plate, a second positioning groove is formed in the outer wall of the synchronous sleeve, and the second convex edge is matched with the second positioning groove. The resistance increasing component and the synchronous sleeve are matched through the convex edge and the groove, so that the friction between the synchronous sleeve and the resistance increasing component is increased; the inner wall of the shell is matched with the resistance increasing component through the convex edge and the groove, resistance of the inner wall of the shell to the resistance increasing component is increased, and therefore rotation of a lead screw connected with the resistance increasing component is limited.

In the constant torque mechanism of the automobile tail door push rod, the positioning sleeve is sleeved on the screw rod and is located between the guide pipe sleeve and the shell, a threaded connection part is arranged at one end of the positioning sleeve corresponding to the shell, threads are arranged on the inner wall of one end of the shell corresponding to the positioning sleeve, the threaded connection part is in threaded connection with the shell through the threads, and the other end of the positioning sleeve is fixedly connected with the guide pipe sleeve.

In the constant torque mechanism of the automobile tail door push rod, at least two positioning protrusions are arranged on the end surface of the conduit sleeve corresponding to the positioning sleeve, positioning grooves III corresponding to the positioning protrusions one by one are arranged on the end surface of the positioning sleeve corresponding to the conduit sleeve, and the positioning protrusions are embedded in the positioning grooves III.

In the constant torque mechanism of the automobile tail door push rod, the inner side of the shell is further provided with a positioning step, the inner wall of the shell is further provided with a positioning step, the elastic piece is a disc-shaped spring piece, the elastic piece abuts against the positioning step, and the static friction piece abuts against the threaded connecting part on the positioning sleeve. The working position of the resistance-increasing component is limited by the positioning step and the threaded connection part, and stable working of the resistance-increasing component is ensured.

In the constant torque mechanism of the automobile tail door push rod, one end, far away from the nut, of the top pipe is fixedly connected with a ball head assembly.

In the constant torque mechanism of the automobile tail door push rod, a compression spring is further sleeved on the outer sides of the guide pipe and the top pipe, one end of the compression spring abuts against the guide pipe sleeve, and the other end of the compression spring abuts against the ball head assembly. The elasticity of the compression spring can generate a pressing effect on the ball head assembly and the guide pipe sleeve, so that the shell connected with the guide pipe sleeve is limited, and the inner wall of the shell can stably generate a resistance effect on the resistance increasing component.

In foretell automobile tail gate push rod's invariable torque mechanism, still the cover is equipped with the bearing fixing base on the spline section, the one end of bearing fixing base with synchronous sleeve meets, the inside holding tank that is provided with of bearing fixing base, be equipped with the bearing in the holding tank, the inner circle cover of bearing is established on the spline section, the other end of bearing fixing base with the stator of motor is connected.

Compared with the prior art, the utility model has the advantages of it is following:

1. the resistance increasing mechanism in the constant torque mechanism of the automobile tail door push rod comprises the fine friction plate, the dynamic friction plate and the elastic piece, wherein the dynamic friction plate is made of wear-resistant materials and is arranged between the two static friction plates, and the contact area of the whole resistance increasing component, the shell and the synchronous sleeve is effectively increased.

2. The constant torque mechanism of the push rod of the automobile tail door is provided with the resistance increasing component, and the static friction sheet on the resistance increasing component is matched with the inner wall of the shell through the convex edge and the groove on the static friction sheet, so that the resistance of the inner wall of the shell to the resistance increasing component is increased; the dynamic friction plate on the resistance increasing component and the synchronous sleeve are matched with each other through the convex edge and the groove on the dynamic friction plate, so that the friction force generated between the resistance increasing component and the synchronous sleeve is increased, the mechanical resistance applied to the screw rod in the rotating process is increased, and the constant torque of the push rod of the automobile tail door is kept.

3. The pressure spring is sleeved on the guide pipe and the top pipe of the constant torque mechanism of the automobile tail door push rod, and the pressure spring respectively presses the ball head assembly and the guide pipe sleeve, so that a shell connected with the guide pipe sleeve is limited, and the shell is ensured to stably generate resistance action on the resistance increasing component.

Drawings

Fig. 1 is a schematic perspective view of a constant torque mechanism of a push rod of a tail gate of an automobile.

FIG. 2 is a cross-sectional view of the constant torque mechanism of the subject automotive tailgate push-rod.

Fig. 3 is an enlarged schematic view at a in fig. 2.

Fig. 4 is an enlarged schematic view at B in fig. 2.

Fig. 5 is an exploded view of a resistance increasing component.

In the figure, 1, a screw; 1a, a spline section; 2. a housing; 2a, positioning a groove I; 2b, screw thread; 3. a motor; 4. a nut; 5. jacking pipes; 6. a conduit; 7. a catheter sheath; 8. a positioning sleeve; 8a, a threaded connection; 8b, positioning a groove III; 9. a resistance increasing member; 9a, a static friction piece; 9a1, ledge one; 9b, a dynamic friction piece; 9b1, convex edge two; 9c, an elastic member; 10. a synchronizing sleeve; 10a, a second positioning groove; 11. a ball head assembly; 12. a compression spring; 13. a bearing fixing seat; 13a, accommodating grooves; 14. and a bearing.

Detailed Description

The following is a specific embodiment of the present invention and the accompanying drawings are combined to further explain the technical solution of the present invention, but the present invention is not limited to the following embodiments.

As shown in fig. 1, 2 and 4, the push rod of the automobile tail gate comprises a lead screw 1, a housing 2, a motor 3, a nut 4, a push pipe 5 and a conduit 6, wherein the lead screw 1 is arranged in the conduit 6, the motor 3 is arranged in the housing 2, one end of the conduit 6 is fixedly connected with the housing 2 through a conduit sleeve 7 and a positioning sleeve 8, one end of the lead screw 1 is provided with a spline section 1a, the spline section 1a is inserted in the housing 2 and the end part thereof is fixedly connected with a rotor or an output shaft of the motor 3, the spline section 1a is further sleeved with a bearing fixing seat 13, one end of the bearing fixing seat 13 is connected with a synchronous sleeve 10, an accommodating groove 13a is arranged inside the bearing fixing seat 13, a bearing 14 is arranged in the accommodating groove 13a, the inner ring of the bearing 14 is sleeved on the spline section 1a, the other end of the bearing fixing seat 13 is connected with a stator of the motor 3, the other end of the lead screw 1 is in threaded connection with the, the other end of the top pipe 5 is fixedly connected with a ball head assembly 11, a compression spring 12 is further sleeved outside the guide pipe 6 and the top pipe 5, one end of the compression spring 12 abuts against the guide pipe sleeve 7, the other end of the compression spring 12 abuts against the ball head assembly 11, the constant torque mechanism comprises a resistance increasing assembly 9 and a synchronous sleeve 10, the synchronous sleeve 10 is meshed and connected to the outer peripheral face of the spline section 1a, the resistance increasing assembly 9 is sleeved on the synchronous sleeve 10, and the outer peripheral face of the resistance increasing assembly is connected with the shell 2.

Specifically, the motor 3 drives the screw rod 1 to rotate through a rotor or an output shaft thereon, the screw rod 1 drives the synchronous sleeve 10 and the screw nut 4 connected therewith to rotate, the screw nut 4 drives the top pipe 5 fixedly connected therewith to rotate, the top pipe 5 drives the ball head assembly 11 fixedly connected therewith to rotate, the synchronous sleeve 10 drives the resistance increasing component 9 sleeved on the outer peripheral surface thereof to rotate, the inner wall of the shell 2 generates resistance effect on the resistance increasing component 9, and then the resistance increasing component 9 limits the rotation of the screw rod 1 connected therewith; one end of the compression spring 12 compresses the ball head assembly 11, the other end compresses the conduit sleeve 7, and the compression action of the compression spring 12 on the conduit sleeve 7 can enable the conduit sleeve 7 to stably generate resistance action on the resistance increasing component 9, so that the rotation of the lead screw 1 is limited. The constant torque mechanism effectively increases the mechanical resistance of the screw rod 1 in the rotating process and keeps the torque of the push rod of the automobile tail door constant.

Further, as shown in fig. 5, the resistance increasing assembly 9 includes three static friction plates 9a, two dynamic friction plates 9b and elastic members 9c, the number of the static friction plates 9a is three, the number of the dynamic friction plates 9b is two, and the two dynamic friction plates are respectively arranged between the adjacent static friction plates 9a, the dynamic friction plates 9b are made of polytetrafluoroethylene composite material, the outer edge of the static friction plate 9a is provided with a first protruding edge 9a1 which extends outwards, the inner wall of the outer shell 2 is provided with a first positioning groove 2a, and the first protruding edge 9a1 is matched with the first positioning groove 2 a; the outer edge of the dynamic friction plate 9b is provided with a second inwardly extending convex edge 9b1, the outer wall of the synchronous sleeve 10 is provided with a second positioning groove 10a, and the second convex edge 9b1 is matched with the second positioning groove 10 a. In the rotation process of the resistance increasing component 9, the first convex edge 9a1 on the fine friction plate 9a is matched with the first positioning groove 2a on the inner wall of the shell 2, and the second convex edge 9b1 on the dynamic friction plate 9b is matched with the second positioning groove 10a on the synchronous sleeve 10, so that the acting area of the resistance increasing component 9 on the inner part of the shell 2 and the synchronous sleeve 10 is enlarged, the resistance of the shell 2 on the resistance increasing component 9 is increased, the friction force between the resistance increasing component 9 and the synchronous sleeve 10 is also increased, and the rotation of the lead screw 1 is accurately limited.

Further, as shown in fig. 3, a positioning sleeve 8 is sleeved on the lead screw 1, the positioning sleeve 8 is located between the catheter sleeve 7 and the housing 2, one end of the positioning sleeve 8 corresponding to the housing 2 is provided with a threaded connection portion 8a, the inner wall of one end of the housing 2 corresponding to the positioning sleeve 8 is provided with a thread 2b, the threaded connection portion 8a is in threaded connection with the housing 2 through the thread 2b, and the other end of the positioning sleeve 8 is fixedly connected with the catheter sleeve 7. The end surface of the catheter sleeve 7 corresponding to the positioning sleeve 8 is provided with at least two positioning bulges 7a, the end surface of the positioning sleeve 8 corresponding to the catheter sleeve 7 is provided with positioning grooves three 8b corresponding to the positioning bulges one by one, and the positioning bulges 7a are embedded in the positioning grooves three 8 b. The inner wall of the shell 2 is also provided with a positioning step 2c, the elastic piece 9c is a disc-shaped spring piece, the elastic piece 9c is abutted against the positioning step 2c, and the static friction piece 9a is abutted against the threaded connecting part 8a on the positioning sleeve 8. The threaded connection part 8a on the positioning sleeve 8 is connected with the inner wall of the shell 2 through threads 2b, and the positioning bulge 7a on the guide pipe sleeve 7 is embedded in the positioning groove III 8b on the positioning sleeve 8, so that the shell 2, the guide pipe sleeve 7 and the positioning sleeve 8 are stably connected. The resistance increasing component 9 is limited by the threaded connection part 8a and the positioning step 2c, so that the resistance increasing component 9 can stably work, and the working efficiency of the mechanism is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although 1, lead screw is used more herein; 1a, a spline section; 2. a housing; 2a, positioning a groove I; 2b, screw thread; 3. a motor; 4. a nut; 5. jacking pipes; 6. a conduit; 7. a catheter sheath; 8. a positioning sleeve; 8a, a threaded connection; 8b, positioning a groove III; 9. a resistance increasing member; 9a, a static friction piece; 9a1, ledge one; 9b, a dynamic friction piece; 9b1, convex edge two; 9c, an elastic member; 10. a synchronizing sleeve; 10a, a second positioning groove; 11. a ball head assembly; 12. a compression spring; 13. a bearing fixing seat; 13a, accommodating grooves; 14. bearings, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is contrary to the spirit of the present invention.

Claims

1. A constant torque mechanism of an automobile tail gate push rod comprises a lead screw (1), a shell (2), a motor (3), a nut (4), a top pipe (5) and a guide pipe (6), wherein the lead screw (1) is arranged in the guide pipe (6), the motor (3) is arranged in the shell (2), one end of the guide pipe (6) is fixedly connected with the shell (2) through a guide pipe sleeve (7) and a positioning sleeve (8), one end of the lead screw (1) is provided with a spline section (1a), the spline section (1a) is inserted in the shell (2) and the end part of the spline section is fixedly connected with a rotor or an output shaft of the motor (3), the other end of the lead screw (1) is in threaded connection with the nut (4), one end of the top pipe (5) is inserted in the guide pipe (6) and fixedly connected with the nut (4) and the top pipe (5), the constant torque mechanism is characterized by comprising a resistance increasing component (9) and a synchronous sleeve (10), wherein the synchronous sleeve (10) is connected to the outer peripheral surface of the spline section (1a) in a meshed mode, the resistance increasing component (9) is sleeved on the synchronous sleeve (10) and the outer peripheral surface of the resistance increasing component is connected with the shell (2).

2. The constant torque mechanism of a push rod for a tailgate of an automobile according to claim 1, wherein said resistance increasing assembly (9) comprises three static friction plates (9a), three dynamic friction plates (9b) and an elastic member (9c), and two dynamic friction plates (9b) are respectively disposed between adjacent static friction plates (9 a).

3. The constant torque mechanism of a push rod for a tailgate of an automobile according to claim 2, characterized in that said dynamic friction plate (9b) is made of a teflon composite.

4. The constant torque mechanism of the push rod of the automobile tail gate according to the claim 2 or 3, characterized in that the outer edge of the static friction plate (9a) is provided with a convex edge one (9a1) extending outwards, the inner wall of the outer shell (2) is provided with a positioning groove one (2a), and the convex edge one (9a1) is matched with the positioning groove one (2 a); the outer edge of the dynamic friction plate (9b) is provided with a second inward extending convex edge (9b1), the outer wall of the synchronous sleeve (10) is provided with a second positioning groove (10a), and the second convex edge (9b1) is matched with the second positioning groove (10 a).

5. The constant torque mechanism of the push rod of the automobile tail gate according to claim 4 is characterized in that the positioning sleeve (8) is sleeved on a lead screw (1), the positioning sleeve (8) is located between the conduit sleeve (7) and the outer shell (2), one end of the positioning sleeve (8) corresponding to the outer shell (2) is provided with a threaded connection portion (8a), the inner wall of one end of the outer shell (2) corresponding to the positioning sleeve (8) is provided with a thread (2b), the threaded connection portion (8a) is in threaded connection with the outer shell (2) through the thread (2b), and the other end of the positioning sleeve (8) is fixedly connected with the conduit sleeve (7).

6. The constant torque mechanism of the push rod of the automobile tail gate according to claim 5 is characterized in that at least two positioning protrusions (7a) are arranged on the end surface of the guide pipe sleeve (7) corresponding to the positioning sleeve (8), the end surface of the positioning sleeve (8) corresponding to the guide pipe sleeve (7) is provided with three positioning grooves (8b) corresponding to the positioning protrusions one by one, and the positioning protrusions (7a) are embedded in the three positioning grooves (8 b).

7. The constant torque mechanism of the push rod of the automobile tail gate according to claim 5 is characterized in that a positioning step (2c) is further arranged on the inner wall of the outer shell (2), the elastic piece (9c) is a disk-shaped spring piece, the elastic piece (9c) abuts against the positioning step (2c), and the static friction piece (9a) abuts against the threaded connection portion (8a) on the positioning sleeve (8).

8. The constant torque mechanism of the push rod of the automobile tail gate according to claim 1, characterized in that a ball joint assembly (11) is fixedly connected to one end of the top pipe (5) far away from the screw nut (4).

9. The constant-torque mechanism of the push rod of the automobile tail door is characterized in that a compression spring (12) is further sleeved outside the guide pipe (6) and the top pipe (5), one end of the compression spring (12) abuts against the guide pipe sleeve (7), and the other end of the compression spring (12) abuts against the ball head assembly (11).

10. The constant torque mechanism of the push rod of the automobile tail gate according to claim 1 is characterized in that a bearing fixing seat (13) is further sleeved on the spline section (1a), one end of the bearing fixing seat (13) is connected with the synchronizing sleeve (10), an accommodating groove (13a) is formed in the bearing fixing seat (13), a bearing (14) is arranged in the accommodating groove (13a), an inner ring of the bearing (14) is sleeved on the spline section (1a), and the other end of the bearing fixing seat (13) is connected with a stator of the motor (3).