Differential tooth transmission electric foot support

Abstract

The utility model discloses a differential gear transmission electric foot support, which comprises a framework, a motor driving mechanism, a differential gear transmission mechanism and a foot support, the framework is provided with the differential gear transmission mechanism, the differential gear transmission mechanism is driven by the motor driving mechanism to rotate, and the rotating part of the differential gear transmission mechanism is provided with the foot support; the differential gear transmission mechanism comprises an eccentric shaft, an inner gear, a cylindrical gear, a gear fixing seat, a limiting piece, a sealing ring and an oil sealing ring, the inner gear is installed at the outer end of the eccentric shaft, an inner gear part is arranged on the inner gear, the cylindrical gear is further sleeved on the eccentric shaft and fixedly installed on the framework, an outer gear is arranged at one end of the cylindrical gear, and the outer gear is sleeved on the outer gear part. The outer gear, the gear part and the inner gear can be installed on the foot support through the gear fixing base. By means of the mode, the foot support has the advantages of being small in size, large in transmission torque, low in noise and the like, and the lifting height of the foot support can be adjusted to meet the requirements of different heights.

Description

Technical Field

[0001] The utility model relates to the technical field of footrests, in particular to an electric footrest with differential gear transmission. Background Art

[0002] An automotive footrest is generally arranged in front of a seat. When a passenger sits on the seat, the feet can be placed on the automotive footrest. The footrest is rotatably arranged on the seat. The passenger rotates it by pressing the footrest with the foot to achieve unfolding. The footrest with such a structure also has low comfort, and the passenger needs to constantly apply a downward pressure to the footrest.

[0003] There are also some electric footrests on the market. They often use a cylinder to push a connecting rod structure to drive the footrest to lift, and the lifting angle is fixed. For people of different heights, the comfortable angle is different. There are also footrests driven by motors on the market. Although they can adjust the angle, when a relatively heavy force is placed on the footrest and it is greater than the torque of the motor, the footrest is easily rotated back, affecting the use.

[0004] Based on the above defects and deficiencies, it is necessary to improve the existing technology and design an electric footrest with differential gear transmission. Summary of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide an electric footrest with differential gear transmission, which has the advantages of small volume, large transmission torque, low noise, etc., and can adjust the lifting height of the footrest by rotating the angle of the motor to meet the needs of different heights.

[0006] To solve the above technical problem, a technical solution adopted by the utility model is: to provide an electric footrest with differential gear transmission, which includes a skeleton, a motor driving mechanism, a differential gear transmission mechanism and a footrest. The differential gear transmission mechanism is installed on the skeleton and is driven to rotate by the motor driving mechanism. A footrest is installed on the rotating part of the differential gear transmission mechanism. Both the motor driving mechanism and the differential gear transmission mechanism are located inside the footrest. The differential gear transmission mechanism includes an eccentric shaft, an internal gear, a cylindrical gear, a gear fixing seat, a limit piece, a sealing ring and an oil sealing ring. A spline hole matching with the spline shaft of the motor driving mechanism is opened at the eccentric position of the eccentric shaft. An internal gear is installed at the outer end of the eccentric shaft. An internal gear part is opened on the internal gear. The eccentric shaft is eccentrically arranged relative to the internal gear part. A cylindrical gear is also sleeved on the eccentric shaft. The cylindrical gear is fixedly installed on the skeleton. An external gear is provided at one end of the cylindrical gear. The external gear can engage with the gear part. The internal gear is installed on the footrest through the gear fixing seat. Limit pieces for limiting the axial positions of the cylindrical gear and the internal gear are clamped on both sides of the eccentric shaft. Sealing rings are installed on the opposite end faces of the cylindrical gear and the internal gear. An oil sealing ring is sleeved outside the internal gear.

[0007] Preferably, a protruding clamping portion is provided at the other end of the cylindrical gear. A clamping hole matching the clamping portion is provided in the mounting portion of the skeleton. The clamping portion is designed to be non-circular. Mounting holes for locking and fixing the cylindrical gear are provided on both sides of the clamping hole. A hole position matching it is provided on the outer end face of the cylindrical gear.

[0008] Preferably, the motor drive mechanism includes a motor and a spline shaft driven by the motor to rotate.

[0009] Preferably, the skeleton includes a fixing portion mounted at the rear of the driver and passenger seats. A row of fixing holes for adjusting the mounting position are provided on the fixing portion. Two opposite mounting portions for mounting the differential gear transmission mechanism extend outward from the outside of the skeleton.

[0010] Preferably, the footrest includes a supporting inner shell and a supporting outer shell clamped and matched with it. An avoidance hole for avoiding the skeleton is provided on the supporting inner shell.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] Compared with the conventional external gear and external gear meshing transmission, in this application, the internal gear and the cylindrical gear adopt the form of internal and external gear meshing, with a small space occupation ratio;

[0013] Compared with the prior art where there is no self-locking function in the external gear and external gear meshing, and the motor torque is limited, once the footrest bears a large pressure, it is easy to rotate back. In this application, due to the eccentric method, when an external force is applied to the footrest, the rotation center of the spline shaft driven by the motor is not concentric with the eccentric shaft. When an external pressure is applied, the torque is large and it is not easy to rotate back;

[0014] In addition, since the gear transmission is arranged inside, it can play a certain noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of an electric footrest with differential gear transmission.

[0016] Figure 2 It is an unfolded structural diagram of an electric footrest with differential gear transmission.

[0017] Figure 3 It is a partial sectional view of an electric footrest with differential gear transmission.

[0018] Figure 4 It is a sectional view of the gear part of the differential gear transmission mechanism of an electric footrest with differential gear transmission.

[0019] Figure 5 It is a partial unfolded structural diagram of an electric footrest with differential gear transmission.

[0020] Among them, 1. Skeleton, 11. Fixed part, 12. Installation part, 120. Clamping hole, 2. Motor drive mechanism, 21. Motor, 22. Spline shaft, 3. Differential gear drive mechanism, 31. Eccentric shaft, 32. Internal gear, 320. Internal gear part, 33. Cylindrical gear, 330. External gear, 331. Clamping part, 34. Gear fixing seat, 35. Limiting piece, 36. Sealing ring, 37. Oil sealing ring, 4. Footrest, 41. Support inner shell, 42. Support outer shell. Detailed implementation manners

[0021] The following describes in detail the preferred embodiments of the present utility model with reference to the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0022] Please refer to Figures 1 to 4 , the embodiments of the present utility model include:

[0023] An electric footrest with differential gear transmission, the electric footrest with differential gear transmission includes a skeleton 1, a motor drive mechanism 2, a differential gear drive mechanism 3 and a footrest 4. The differential gear drive mechanism 3 is installed on the skeleton 1 and is driven to rotate by the motor drive mechanism 2. The rotating part of the differential gear drive mechanism 3 is installed with the footrest 4, and both the motor drive mechanism 2 and the differential gear drive mechanism 3 are located inside the footrest 4.

[0024] The skeleton 1 includes a fixed part 11 installed at the rear of the driver and passenger seats. A row of fixing holes for adjusting the installation position are opened on the fixed part 11. Two opposite installation parts 12 for installing the differential gear drive mechanism 3 extend outward from the outside of the skeleton 1.

[0025] The motor drive mechanism 2 includes a motor 21 and a spline shaft 22 driven to rotate by the motor 21.

[0026] The differential gear transmission mechanism 3 includes an eccentric shaft 31, an internal gear 32, a cylindrical gear 33, a gear fixing seat 34, a limit piece 35, a sealing ring 36, and an oil sealing ring 37. A spline hole for mating with the spline shaft 22 of the motor drive mechanism 2 is provided at the eccentric position of the eccentric shaft 31. An internal gear 32 is installed at the outer end of the eccentric shaft 31. An internal gear portion 320 is provided on the internal gear 32. The eccentric shaft 31 is eccentrically arranged relative to the internal gear portion 320. The number of teeth of the internal gear 32 is Z1. A cylindrical gear 33 is also sleeved on the eccentric shaft 31. The cylindrical gear 33 is fixedly installed on the mounting portion 12 of the frame 1. An external gear 330 is provided at one end of the cylindrical gear 33. The external gear 330 can engage with the gear portion 320. The number of teeth of the cylindrical gear 33 is Z2. The internal gear 32 is installed on the footrest 4 through the gear fixing seat 34. Limit pieces 35 for limiting the axial positions of the cylindrical gear 33 and the internal gear 32 are clamped on both sides of the eccentric shaft 31. Sealing rings 36 are installed on the opposite end faces of the cylindrical gear 33 and the internal gear 32. An oil sealing ring 37 is sleeved outside the internal gear 33.

[0027] A protruding clamping portion 331 is provided at the other end of the cylindrical gear 33. A clamping hole 120 for mating with the clamping portion 331 is provided in the mounting portion 12 of the frame 1. To prevent the cylindrical gear 32 from rotating relative to the frame 1, the clamping portion 321 is non-circular in design. Mounting holes for locking and fixing the cylindrical gear 33 are provided on both sides of the clamping hole 120. A hole position for mating therewith is provided on the outer end face of the cylindrical gear 32.

[0028] The footrest 4 includes a support inner shell 41 and a support outer shell 42 which is clamped and mated with the support inner shell 41. An avoidance hole for avoiding the frame 1 is provided on the support inner shell 41.

[0029] When the electric footrest with differential gear transmission of the present invention works, the motor 21 drives the spline shaft 22 to rotate. The spline shaft 22 drives the eccentric shaft 31 to rotate. The eccentric shaft 31 drives the internal gear 32. During the rotation process, the part of the internal gear portion 320 close to the eccentric shaft 31 meshes with the gear portion 320 of the cylindrical gear 33 for a full circle in sequence. The rotation center of the eccentric shaft 31 is the axis of the internal gear. When the motor 21 rotates 360°, the rotation angle β of the footrest 4 = 360° / Z1*(Z1 - Z2), (Z1 is the number of teeth of the internal gear 32, Z2 is the number of teeth of the cylindrical gear 33), and it can adjust different rotation angles according to people of different heights. Since the cylindrical gear 33 is fastened to the frame 1, the motor drive mechanism 2 drives the footrest 4 to rotate eccentrically along the cylindrical gear 33.

[0030] The electric footrest with differential gear transmission of the present invention has the advantages of small volume, large transmission torque, low noise, etc., and can adjust the lifting height of the footrest by the rotation angle of the motor to meet the needs of different heights.

[0031] The above are only embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An electric footrest with differential tooth transmission, characterized in that: It includes a framework, a motor drive mechanism, a differential gear transmission mechanism, and a footrest. The differential gear transmission mechanism is installed on the framework and is driven to rotate by the motor drive mechanism. The rotating part of the differential gear transmission mechanism is equipped with a footrest, and both the motor drive mechanism and the differential gear transmission mechanism are located inside the footrest. The differential gear transmission mechanism includes an eccentric shaft, an internal gear, a cylindrical gear, a gear fixing seat, a limit piece, a sealing ring, and an oil sealing ring. A spline hole for mating with the spline shaft of the motor drive mechanism is provided at the eccentric position of the eccentric shaft. An internal gear is installed at the outer end of the eccentric shaft, and an internal gear portion is provided on the internal gear. The eccentric shaft is eccentrically arranged relative to the internal gear portion. A cylindrical gear is also sleeved on the eccentric shaft, and the cylindrical gear is fixedly installed on the framework. An external gear is provided at one end of the cylindrical gear, and the external gear can engage with the gear portion. The internal gear is installed on the footrest through a gear fixing seat. Limit pieces for restricting the axial positions of the cylindrical gear and the internal gear are clamped on both sides of the eccentric shaft. Sealing rings are installed on the opposite end faces of the cylindrical gear and the internal gear, and an oil sealing ring is sleeved outside the internal gear.

2. The electric footrest with differential tooth transmission according to claim 1, characterized in that: A protruding clamping portion is provided at the other end of the cylindrical gear. A clamping hole for mating with the clamping portion is provided in the installation portion of the framework. The clamping portion is designed to be non-circular, and installation holes for locking and fixing the cylindrical gear are provided on both sides of the clamping hole. A hole position for mating therewith is provided on the outer end face of the cylindrical gear.

3. The electric footrest with differential tooth transmission according to claim 1, characterized in that: The motor drive mechanism includes a motor and a spline shaft driven to rotate by the motor.

4. The electric footrest with differential tooth transmission according to claim 1, characterized in that: The framework includes a fixing portion installed at the rear of the driver and passenger seats. A row of fixing holes for adjusting the installation position are provided on the fixing portion. Two opposite installation portions for installing the differential gear transmission mechanism extend outward from the outside of the framework.

5. The electric footrest with differential tooth transmission according to claim 1, characterized in that: The footrest includes a support inner shell and a support outer shell that is clamped and matched with it. An avoidance hole for avoiding the framework is provided on the support inner shell.

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