Linear driving module for pulling vehicle-mounted camera

Abstract

The utility model discloses a linear driving module used for pulling a vehicle-mounted camera, which comprises a support, a driving element, a sliding block and a pulley assembly, the driving element comprises a motor and a winding shaft, an output shaft of the motor is connected with the winding shaft, the sliding block is installed on the support in a sliding mode, and the pulley assembly comprises a spring guide rod, a spring, a pulley fixing plate, a pulley and a limiting block. The linear driving module further comprises a pull rope used for pulling the sliding block to move, a first part of the pull rope and a second part of the pull rope are wound around the winding shaft, and the winding directions of the first part and the second part on the winding shaft are opposite. And the third part of the pull rope bypasses the pulley, and the third part of the pull rope is fixedly provided with a sliding block so as to be used for pulling the sliding block to linearly move in the axial direction of the guide rod. Power is transmitted through the pull rope, the efficiency is high, and the pull rope has tensile force, so that the moving precision of the sliding block can be ensured.

Description

Technical Field

[0001] The utility model belongs to the field of electric actuators, and more specifically, relates to a linear drive module for pulling a vehicle-mounted camera. Background Technique

[0002] An actuator is a driving device that can provide linear or rotational motion. It utilizes a certain driving energy source and operates under the action of a certain control signal.

[0003] A linear actuator is a power-driven device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. It can be used as an actuating mechanism in various simple or complex technological processes to achieve remote control, centralized control, or automatic control. The motor drives the lead screw mechanism to move. The lead screw mechanism converts the rotational motion of the motor into a linear motion, and uses the forward and reverse rotation of the motor to drive the transmission nut to reciprocate linearly and the reciprocating linear motion of the push rod connected to the transmission nut.

[0004] The commonly used lead screw mechanism has a high cost. Due to the high machining accuracy and low roughness of components such as ball screws and transmission nuts, the manufacturing cost is relatively high, especially when driving over a long stroke, the cost problem is particularly obvious. The spiral groove raceways on the lead screw and the transmission nut need to be ground into forming surfaces, with complex process requirements and difficult manufacturing. Moreover, the lead screw and the transmission nut are prone to wear, which affects the transmission accuracy. In the traditional lead screw mechanism, generally, a metal lead screw and a plastic nut are used to achieve transmission by friction, resulting in large loss of transmission efficiency, and there is a large difference in the expansion coefficients between the metal lead screw and the plastic nut, and the low-temperature performance is poor. Summary of the Utility Model

[0005] In view of the above-mentioned defects or improvement requirements in the prior art, the utility model provides a linear drive module for pulling a vehicle-mounted camera. It transmits power through a pull rope, has high efficiency, and there is a tension force on the pull rope, which can ensure the accuracy when the slider moves.

[0006] To achieve the above object, according to the utility model, there is provided a linear drive module for pulling a vehicle-mounted camera, which is characterized in that it includes a bracket, a motor, a winding shaft, a slider, and a pulley assembly. The motor is a reversible motor, the motor is installed on the bracket, the winding shaft is rotatably installed on the bracket, the output shaft of the motor is connected to the winding shaft, and the slider is slidably installed on the bracket, wherein:

[0007] The pulley assembly includes a spring guide rod, a spring, a pulley fixing plate, a pulley and a limit block. The spring guide rod is fixedly installed on the bracket. The spring and the pulley fixing plate are respectively sleeved on the spring guide rod. The pulley fixing plate is in sliding fit with the spring guide rod. The pulley is installed on the pulley fixing plate. The pulley fixing plate and the bracket cooperate to clamp the spring and keep the spring in a compressed state. The limit block is installed on the spring guide rod to limit the axial displacement of the pulley fixing plate along the spring guide rod.

[0008] The linear drive module further includes a pull rope for pulling the slider to move. The first part and the second part of the pull rope are respectively wound around the winding shaft, and the winding directions of the first part and the second part on the winding shaft are opposite.

[0009] The third part of the pull rope bypasses the pulley, and the third part is located between the first part and the second part. The third part of the pull rope is fixedly installed on the slider to drive the slider to move.

[0010] Preferably, a guide rod is installed on the bracket. The guide rod passes through the slider and is in sliding fit with the slider.

[0011] Preferably, the output shaft of the motor is connected to the winding shaft through a speed reducer.

[0012] Preferably, a magnetic position sensor is further included. The magnetic position sensor includes an induction magnet and a position induction Hall element for obtaining the position of the induction magnet. The induction magnet is installed on the slider, and the position induction Hall element is installed on a circuit board. The circuit board is installed on the bracket.

[0013] Preferably, the circuit board is an FPC.

[0014] Preferably, the end parts of the first part and the second part of the pull rope are respectively knotted to form rope knots, and each rope knot is fixed on the winding shaft by means of screw locking.

[0015] Preferably, the winding shaft includes a rotating shaft and two wire hanging wheels. The rotating shaft is rotatably installed on the bracket and is connected to the output shaft of the motor. Each wire hanging wheel is respectively arranged at one end of the rotating shaft. The end parts of the first part and the second part of the pull rope are respectively fixed on one wire hanging wheel.

[0016] Preferably, the outer circumferential surface of the pulley has an annular groove, and the third part of the pull rope enters the annular groove of the pulley.

[0017] The linear drive module further includes a wire passing shaft fixedly installed on the bracket, and the third part of the pulling rope is pressed on the wire passing shaft so that the third part of the pulling rope abuts against the same side of the pulley.

[0018] Preferably, the limiting block is threadedly connected to the spring guide rod for adjusting the pre-tightening force of the spring.

[0019] Preferably, the slider is provided with a mounting hole for mounting a vehicle-mounted camera.

[0020] Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

[0021] 1) In the linear drive module for pulling a vehicle-mounted camera of the present invention, the winding directions of the first part and the second part of the pulling rope around the winding shaft are opposite. In this way, when the motor drives the winding shaft to rotate, the first part and the second part of the pulling rope can cooperate to drive the third part to move so as to transmit power. The slider can be pulled bidirectionally by the third part. Compared with the lead screw drive, the efficiency loss is small and the efficiency is higher.

[0022] 2) In the linear drive module for pulling a vehicle-mounted camera of the present invention, the slider is pulled by the pulling rope. Compared with the lead screw drive, the moving speed is faster, the sound performance is better, and it is less affected by temperature and can still maintain good transmission performance at low temperatures.

[0023] 3) In the linear drive module for pulling a vehicle-mounted camera of the present invention, the pulley assembly can tension and guide the pulling rope, and a spring is used to automatically adjust the tension force of the pulley on the pulling rope. The accuracy of the linear movement of the slider is high, and the appropriate tension force can ensure the bearing capacity, service life and safety of the pulling rope.

[0024] 4) In the linear drive module for pulling a vehicle-mounted camera of the present invention, the induction magnet and the position induction Hall element cooperate to obtain the precise position of the slider, so as to facilitate the control of the position of the slider.

[0025] 5) In the linear drive module for pulling a vehicle-mounted camera of the present invention, during the working process of the slider, even if the motor is powered off, the slider can be fixedly stopped at the required position and will not shift, and higher positioning accuracy can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the slider of the present invention stopped in the middle of the bracket;

[0027] Figure 2 、 Figure 3 It is a schematic diagram of the slider of the present invention at different perspectives when moving to the first extreme position;

[0028] Figure 4 Schematic diagram when the slider of the present utility model moves to the second extreme position. Specific embodiments

[0029] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Refer to Figures 1 to 4 , a linear drive module for pulling a vehicle-mounted camera, comprising a bracket 4, a motor 1, a winding shaft 19, a slider 12 and a pulley assembly 20. The motor 1 is a forward and reverse motor. The motor 1 is installed on the bracket 4. The winding shaft 19 is rotatably installed on the bracket 4, preferably rotatably installed on the bracket 4 through a bearing. The output shaft of the motor 1 is connected to the winding shaft 19 for driving the winding shaft 19 to rotate forward and backward. The output shaft of the motor 1 is preferably connected to the winding shaft 19 through a reduction gearbox 3. The slider 12 is slidably installed on the bracket 4. The slider 12 can slide linearly on the bracket 4. A track or a guide rod can be provided on the bracket 4 to guide the slider to slide linearly on the bracket 4.

[0031] The pulley assembly 20 includes a spring guide rod 15, a spring 14, a pulley fixing plate 16, a pulley 17 and a limit block 21. The spring guide rod 15 is fixedly installed on the bracket 4. The spring 14 and the pulley fixing plate 16 are respectively sleeved on the spring guide rod 15. The pulley fixing plate 16 is in sliding fit with the spring guide rod 15, so that the pulley fixing plate 16 can move relative to the spring guide rod 15. The pulley 17 is installed on the pulley fixing plate 16. The pulley 17 is preferably rotatably installed on the pulley fixing plate 16. The pulley fixing plate 16 and the bracket 4 cooperate to clamp the spring 14 and keep the spring 14 in a compressed state, so that the spring 14 can apply an elastic force on the pulley fixing plate 16. The limit block 21 is installed on the spring guide rod 15 to limit the axial displacement of the pulley fixing plate 16 along the spring guide rod 15. The limit block 21 limits the pulley fixing plate 16 between the spring 14 and the limit block 21. The limit block 21 is preferably threadedly connected to the spring guide rod 15 to adjust the pre-tightening force of the spring 14. The limit block 21 can adjust the pre-tightening force of the spring 14 by tightening or loosening. The limit block 21 preferably adopts a self-locking nut. If there is only one spring guide rod 15, the cross-section of the spring guide rod 15 can be square to prevent the pulley fixing plate 16 and the pulley 17 from rotating around the spring guide rod 15. Preferably, two spring guide rods 15, two springs 14 and two limit blocks 21 are provided in the present utility model. One spring 14 and one limit block 21 are respectively installed on each spring guide rod 15. Preferably, one pulley fixing plate 16 and one pulley 17 are provided. The pulley fixing plate 16 is sleeved on the two spring guide rods 15.

[0032] The linear drive module further includes a pulling rope 8 for pulling the slider 12 to move. The first part 81 and the second part 82 of the pulling rope 8 are respectively wound around the winding shaft 19, and the winding directions of the first part 81 and the second part 82 on the winding shaft 19 are opposite. When the motor 1 drives the winding shaft 19 to rotate, when the first part 81 (or the second part 82) of the pulling rope 8 is wound around the winding shaft 19, the second part 82 (or the first part 81) of the pulling rope 8 unwinds from the winding shaft 19. On the winding shaft 19, the first part 81 and the second part 82 of the pulling rope 8 cooperate with each other to realize the continuous operation of the pulling rope 8. Preferably, the center line of the pulley 17 is perpendicular to the center line of the winding shaft 19, which is convenient for the pulling rope 8 to be wound around the winding shaft 19 and bypass the pulley 17.

[0033] The first part 81 and the second part 82 are respectively spirally wound around the winding shaft 19, and the part of the pull rope 8 wound around the winding shaft 19 has a spiral angle. When the pull rope 8 is wound around the winding shaft 19, the turns of the pull rope 8 will automatically push against each other, so that the first part 81 and the second part 82 can be arranged neatly on the winding shaft 19, without local accumulation in a certain part of the winding shaft 19, which can improve the moving smoothness of the slider 12 and prevent the pull rope 8 from locally piling up too high on the winding shaft 19.

[0034] The third part 83 of the pull rope 8 bypasses the pulley 17, and the third part 83 is located between the first part 81 and the second part 82. The third part 83 of the pull rope 8 is fixedly installed on the slider 12 to drive the slider 12 to move.

[0035] The pull rope 8 can be formed by fixing multiple ropes together, or can be a single integral rope. The pull rope 8 of the present utility model is preferably a single integral rope.

[0036] The third part 83 is in a U shape, and the slider 12 is fixedly installed on one line of the third part 83. When the first part 81 (or the second part 82) is wound around the winding shaft 19, the slider 12 can be driven to move. Preferably, a guide rod 9 is installed on the bracket 4 in the present utility model. The guide rod 9 passes through the slider 12 and is slidably matched with the slider 12. Then, the guide rod 9 restricts the slider 12 on the guide rod 9, and the slider 12 can only slide linearly along the axial direction of the guide rod 9. Preferably, a mounting hole is provided on the slider 12 for mounting and carrying the vehicle-mounted camera 18. If there is only one guide rod 9, the cross-section of the guide rod 9 can be set to be square to prevent the slider 12 from rotating around the guide rod 9. Preferably, multiple guide rods 9 are provided in the present utility model and they are parallel to each other. Each guide rod 9 passes through the slider 12 respectively and each guide rod 9 is slidably matched with the slider 12 respectively. If the guide rods 9 are arranged vertically, the slider can drive the slider 12 and the vehicle-mounted camera 18 on the slider 12 to move up and down.

[0037] Furthermore, the utility model further includes a magnetic position sensor. The magnetic position sensor includes an induction magnet 11 and a position induction Hall element 10 for obtaining the position of the induction magnet 11. The induction magnet 11 is installed on the slider 12, and the position induction Hall element 10 is installed on the circuit board 2. The circuit board 2 is installed on the bracket 4, and the circuit board 2 is preferably an FPC. The position induction Hall element 10 is used to sense the real-time position of the slider 12 on which the induction magnet 11 is installed. The position induction Hall element 10 is a sensor based on the Hall effect and can detect changes in the magnetic field. When the slider 12 moves, the position of the induction magnet 11 changes relative to the position induction Hall element 10, thereby changing the intensity of the magnetic field. The position induction Hall element 10 can obtain the position of the induction magnet 11 in real time according to the change in the intensity of the magnetic field, and then obtain the position of the vehicle-mounted camera 18 on the slider 12.

[0038] Furthermore, the end parts of the first part 81 and the second part 82 of the drawstring 8 are respectively knotted to form knots, and each knot is fixed on the winding shaft 19 by means of screw locking. When installing the drawstring 8, the third part 83 of the drawstring 8 can first be passed around the pulley 17, then the first part 81 and the second part 82 are respectively wound around the winding shaft 19, and finally the end parts are knotted and then fixed by screw locking. The installation of the drawstring 8 is relatively convenient.

[0039] Furthermore, the winding shaft 19 preferably includes a rotating shaft 5 and two wire-hanging wheels 6. The rotating shaft 5 is rotatably installed on the bracket 4 and connected to the output shaft of the motor 1. The first part 81 and the second part 82 of the drawstring 8 are mainly wound around the rotating shaft 5. Each wire-hanging wheel 6 is respectively arranged at one end of the rotating shaft 5. The wire-hanging wheel 6 and the rotating shaft 5 can be in interference fit or a shoulder on the rotating shaft 5. After the end parts of the first part 81 and the second part 82 of the drawstring 8 are respectively knotted, they are respectively fixed on a wire-hanging wheel 6 by means of screw locking.

[0040] Furthermore, the outer circumferential surface of the pulley 17 has an annular groove, and the third part 83 of the drawstring 8 enters the annular groove of the pulley 17.

[0041] The linear drive module further includes a wire passing shaft 7 fixedly mounted on the bracket 4. The third part 83 of the pulling rope 8 is pressed against the wire passing shaft 7 so that the third part 83 of the pulling rope 8 abuts against the same side of the pulley 17. Since the groove width of the annular groove is generally relatively large, the wire passing shaft 7 can make the pulling rope 8 closely adhere to the same side of the pulley 17. During the process that the first part 81 of the pulling rope 8 unwinds and the second part 82 winds up, the two wires of the third part 83 of the pulling rope 8 will not have a large jitter amplitude, so that the vehicle-mounted camera 18 on the slider 12 will not be affected by the large jitter amplitude and the shooting effect will not be affected. Moreover, it is also convenient for the pulling rope 8 to be wound around the winding shaft 19. When winding, the turns will not be disordered, but will be neatly arranged in a spiral shape on the winding shaft 19.

[0042] After the motor 1 is powered on and rotates forward, it drives the winding shaft 19 to rotate. The winding shaft 19, the pulling rope 8, and the pulley 17 tensioned by the spring 14 form a closed transmission unit. The rotation of the rotating shaft makes the pulling rope 8 drive the pulley 17 to rotate. The first part 81 of the pulling rope 8 unwinds and the second part 82 winds up again. The movement of the third part 83 of the pulling rope 8 drives the slider 12 to move. The slider 12 then moves smoothly under the restriction of the guide rod 9. The position sensing Hall element 10 senses the real-time position of the slider 12 through the sensing magnet 11. When the motor 1 rotates in reverse, it can drive the slider 12 to move linearly in the reverse direction, so that it can be applied to the lifting of the vehicle-mounted camera 18.

[0043] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear drive module for pulling a vehicle-mounted camera, characterized in that, It includes a bracket, a motor, a winding shaft, a slider and a pulley assembly. The motor is a forward and reverse motor, which is installed on the bracket. The winding shaft is rotatably installed on the bracket. The output shaft of the motor is connected to the winding shaft. The slider is slidably installed on the bracket, where: The pulley assembly includes a spring guide rod, a spring, a pulley fixing plate, a pulley and a limit block. The spring guide rod is fixedly installed on the bracket. The spring and the pulley fixing plate are respectively sleeved on the spring guide rod. The pulley fixing plate is slidably matched with the spring guide rod. The pulley is installed on the pulley fixing plate. The pulley fixing plate and the bracket cooperate to clamp the spring and keep the spring in a compressed state. The limit block is installed on the spring guide rod to limit the axial displacement of the pulley fixing plate along the spring guide rod; The linear drive module further includes a pulling rope for pulling the slider to move. The first part and the second part of the pulling rope are respectively wound around the winding shaft, and the winding directions of the first part and the second part on the winding shaft are opposite; The third part of the pulling rope bypasses the pulley, and the third part is located between the first part and the second part. The third part of the pulling rope is fixedly installed on the slider to drive the slider to move.

2. The linear drive module for pulling a vehicle-mounted camera according to claim 1, wherein A guide rod is installed on the bracket. The guide rod passes through the slider and is slidably matched with the slider.

3. The linear drive module for pulling a vehicle-mounted camera according to claim 1, characterized in that, The output shaft of the motor is connected to the winding shaft through a speed reducer.

4. The linear drive module for pulling a vehicle-mounted camera according to claim 1, characterized in that, It further includes a magnetic position sensor, which includes an induction magnet and a position induction Hall element for obtaining the position of the induction magnet. The induction magnet is installed on the slider, and the position induction Hall element is installed on a circuit board. The circuit board is installed on the bracket.

5. The linear drive module for pulling a vehicle-mounted camera according to claim 4, wherein The circuit board is an FPC.

6. The linear drive module for pulling a vehicle-mounted camera according to claim 1, wherein, The end parts of the first part and the second part of the pulling rope are respectively knotted to form knots, and each knot is fixed on the winding shaft by means of screw locking.

7. The linear drive module for pulling a vehicle-mounted camera according to claim 1, wherein, The winding shaft includes a rotating shaft and two wire hanging wheels. The rotating shaft is rotatably installed on the bracket and is connected to the output shaft of the motor. Each wire hanging wheel is respectively arranged at one end of the rotating shaft. The end parts of the first part and the second part of the pulling rope are respectively fixed on one wire hanging wheel.

8. The linear drive module for pulling a vehicle-mounted camera according to claim 1, characterized in that, The outer circular surface of the pulley has an annular groove, and the third part of the pulling rope enters the annular groove of the pulley; The linear drive module further includes a wire passing shaft fixedly installed on the bracket. The third part of the pulling rope is pressed on the wire passing shaft so that the third part of the pulling rope abuts against the same side of the pulley.

9. The linear drive module for pulling a vehicle-mounted camera according to claim 1, characterized in that, The limit block is threadedly connected to the spring guide rod to adjust the pre-tightening force of the spring.

10. The linear drive module for pulling a vehicle-mounted camera according to claim 1, characterized in that, An installation hole is provided on the slider for installing a vehicle-mounted camera.

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