Variable-tooth-thickness non-circular gear transmission planetary gear train rehabilitation instrument

Abstract

The utility model discloses a variable-tooth-thickness non-circular gear transmission planetary gear train rehabilitation instrument which comprises a machine frame, a motor, a rotatable non-circular driven wheel and a circular sun wheel fixedly installed through a fixing base are installed on the machine frame, and the circular sun wheel, the motor and the non-circular driven wheel are parallel to one another and located on the same horizontal line. The output end of the motor penetrates through the fixed seat and the circular sun gear to be connected with a planet carrier, one side of the planet carrier is connected with a circular planet gear, and the circular planet gear is meshed with the circular sun gear to form a circular gear pair; the other side of the planet carrier is connected with a non-circular driving wheel, the non-circular driving wheel is meshed with a non-circular driven wheel to form a non-circular gear pair, and the side, away from the circular sun wheel, of the non-circular driven wheel is connected with a swing frame. The utility model can solve the problem of insufficient stability in the use process of the rehabilitation apparatus.

Description

Technical Field

[0001] The utility model belongs to the technical field of rehabilitation devices, and particularly relates to a rehabilitation device with a planetary gear train driven by a non-circular gear with variable tooth thickness. Background Art

[0002] Rehabilitation devices are equipment that helps patients carry out passive movements and daily activities to promote rehabilitation; after knee surgery, if the patient adheres to using a knee rehabilitation device at a certain frequency for a period of time, the speed of knee postoperative rehabilitation can be greatly accelerated. In the prior art, patients' knee rehabilitation training mostly uses hand-held crutches or rehabilitation nursing devices to assist patients to complete the training. Using hand-held crutches for training has low efficiency and is very likely to cause secondary injuries. Although there have appeared some devices or equipment that can assist in knee rehabilitation exercises, some defects are found during use. For example, most lower limb rehabilitation training devices use pulley lifting, resulting in insufficient stability during use and affecting the use effect of the lower limb rehabilitation training device. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a rehabilitation device with a planetary gear train driven by a non-circular gear with variable tooth thickness, and the utility model can solve the problem of insufficient stability during the use of the rehabilitation device.

[0004] To achieve the above purpose, a rehabilitation device with a planetary gear train driven by a non-circular gear with variable tooth thickness of the utility model includes a frame, on which a motor, a rotatable non-circular driven wheel, and a circular sun gear fixedly installed through a fixed seat are installed. The circular sun gear, the motor, and the non-circular driven wheel are parallel to each other and on a horizontal line. The output end of the motor penetrates through the fixed seat and the circular sun gear and is connected with a planet carrier. One side of the planet carrier is connected with a circular planet gear, and the circular planet gear meshes with the circular sun gear to form a circular gear pair; the other side of the planet carrier is connected with a non-circular driving wheel, the non-circular driving wheel meshes with the non-circular driven wheel to form a non-circular gear pair, and a swing frame is connected to the side of the non-circular driven wheel away from the circular sun gear.

[0005] Further, a gasket is arranged between the non-circular driving wheel and the planet carrier to reduce the backlash of the non-circular gear pair.

[0006] Further, the non-circular driving wheel and the non-circular driven wheel adopt the form of variable tooth thickness, and the tooth profile linearly changes with the displacement coefficient along the axial direction; the negative displacement end face of the non-circular driving wheel meshes with the positive displacement end face of the non-circular driven wheel to form a non-circular gear pair with variable tooth thickness, and the backlash is reduced by finely adjusting the axial position of the non-circular gear with variable tooth thickness.

[0007] Further, it also includes a right seat and a left seat that are symmetrically arranged on both sides of the swing frame and fixedly connected to the frame.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] By arranging a circular gear pair and a non-circular gear pair, under the drive of a motor, the planet carrier rotates uniformly, driving the circular planet gear to revolve around the circular sun gear, and the circular planet gear rotates around its own axis. At the same time, the non-circular driving gear revolves around the non-circular driven gear, and the non-circular driving gear rotates around its own axis; during the rotation of the non-circular driving gear, it drives the non-circular driven gear to rotate; during the operation, the relative position of the meshing node of the circular gear pair and the meshing node of the non-circular gear pair continuously changes. As the planet carrier rotates, the rotation direction of the non-circular driven gear alternates, forming a swinging motion. Through the rotation of the planet carrier and the cooperation between various components, the stable operation of the rehabilitation device can be realized.

[0010] Furthermore, both the non-circular driving gear and the non-circular driven gear of the utility model adopt the form of variable tooth thickness, and the negative modified end face of the non-circular driving gear meshes with the positive modified end face of the non-circular driven gear, constituting a variable tooth thickness non-circular gear pair. A gasket is arranged between the non-circular driving gear and the planet carrier, and by adjusting the thickness of the gasket, the axial position of the non-circular driving gear can be finely adjusted, thereby effectively reducing the backlash of the non-circular gear pair and making the swinging process smoother and more conducive to the rehabilitation of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the utility model;

[0012] Figure 2 is a schematic structural diagram of the variable tooth thickness non-circular driving gear of the utility model;

[0013] Figure 3 is a schematic structural diagram of the variable tooth thickness non-circular driven gear of the utility model;

[0014] Figure 4 is a schematic structural diagram of the variable tooth thickness non-circular gear pair of the utility model;

[0015] In the figure: 1 - non-circular driven gear; 2 - gasket; 3 - non-circular driving gear; 4 - planet carrier; 5 - circular planet gear; 6 - circular sun gear; 7 - motor; 8 - fixed seat; 9 - frame; 10 - right seat; 11 - swing frame; 12 - left seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to make the above objects, features, and advantages of the utility model more obvious and understandable, the following detailed description of the utility model is given in conjunction with the drawings and specific embodiments.

[0017] As Figure 1As shown in the figure, a planetary gear train rehabilitation device with a variable tooth thickness non-circular gear drive according to this embodiment includes a frame 9. An electric motor 7, a rotatable non-circular driven gear 1, and a circular sun gear 6 fixedly installed through a fixing seat 8 are installed on the frame 9. The circular sun gear 6, the electric motor 7, and the non-circular driven gear 1 are parallel to each other and on the same horizontal line. The output end of the electric motor 7 passes through the fixing seat 8 and the circular sun gear 6 and is connected to a planetary carrier 4. One side of the planetary carrier 4 is connected to a circular planetary gear 5. The circular planetary gear 5 meshes with the circular sun gear 6 to form a circular gear pair; the other side of the planetary carrier 4 is connected to a non-circular driving gear 3. The non-circular driving gear 3 meshes with the non-circular driven gear 1 to form a non-circular gear pair; a swing frame 11 is connected to the side of the non-circular driven gear 1 away from the circular sun gear 6. A right seat 10 and a left seat 12 fixedly connected to the frame 9 are symmetrically arranged on both sides of the swing frame 11. The electric motor 7 drives the planetary carrier 4 to rotate at a constant speed, driving the circular planetary gear 5 to revolve around the circular sun gear 6, and the circular planetary gear 5 rotates around its own axis. At the same time, the non-circular driving gear 3 revolves around the non-circular driven gear 1, and the non-circular driving gear 3 rotates around its own axis; the non-circular driving gear 3 drives the non-circular driven gear 1 to rotate during the rotation process. During the operation, the relative position of the meshing node of the circular gear pair and the meshing node of the non-circular gear pair changes continuously. As the planetary carrier 4 rotates, the rotation angle direction of the non-circular driven gear 1 changes alternately, forming a swing motion. A gasket 2 is arranged between the non-circular driving gear 3 and the planetary carrier 4. By adjusting the thickness of the gasket 2, the backlash of the non-circular gear pair can be effectively reduced, making the swing process smoother and more conducive to the rehabilitation of patients.

[0018] As Figure 2 , 3 shown, both the non-circular driving gear 3 and the non-circular driven gear 1 adopt the form of variable tooth thickness, and their tooth profiles change linearly with the displacement coefficient along the axis direction. The negatively displaced end face of the non-circular driving gear 3 meshes with the positively displaced end face of the non-circular driven gear 1 to form a variable tooth thickness non-circular gear pair. As Figure 4 shown, the backlash can be reduced by fine-tuning the position, making the operation process smoother and beneficial to the rehabilitation of patients.

[0019] Working principle: When using a planetary gear train rehabilitation device with a variable tooth thickness non-circular gear drive, the patient sits on the right seat 10, fixes the right lower leg on the swing frame 11 with a safety belt, and then starts the electric motor 7 to work. The electric motor 7 drives the planetary carrier 4 to rotate at a constant speed. The relative position of the meshing node of the circular gear pair and the meshing node of the non-circular gear pair changes continuously. The rotation angle direction of the non-circular driven gear 1 changes alternately to form a swing motion, driving the swing frame 11 and the right knee joint of the patient fixed on the swing frame 11 to swing for rehabilitation training. Similarly, when the patient needs to train the left knee, the patient sits on the left seat 12, fixes the left lower leg on the swing frame 11 with a safety belt, and runs the device to perform rehabilitation training.

Claims

1. A variable-thickness non-circular gear transmission planetary gear train rehabilitation device, characterized in that: The invention comprises a frame (9), on which a motor (7), a rotatable non-circular driven wheel (1) and a circular sun wheel (6) fixedly mounted via a fixing seat (8) are mounted, the circular sun wheel (6), the motor (7) and the non-circular driven wheel (1) are parallel to each other and are located on a horizontal line, the output end of the motor (7) passes through the fixing seat (8) and the circular sun wheel (6) and is connected to a planetary frame (4), one side of the planetary frame (4) is connected to a circular planetary wheel (5), the circular planetary wheel (5) meshes with the circular sun wheel (6) to form a circular gear pair; the other side of the planetary frame (4) is connected to a non-circular driving wheel (3), the non-circular driving wheel (3) meshes with the non-circular driven wheel (1) to form a non-circular gear pair, and the side of the non-circular driven wheel (1) away from the circular sun wheel (6) is connected to a swing frame (11).

2. The variable-thickness non-circular gear transmission planetary gear train rehabilitation device according to claim 1, characterized in that: A gasket (2) capable of reducing the backlash of the non-circular gear pair is arranged between the non-circular driving wheel (3) and the planet carrier (4).

3. The variable-thickness non-circular gear transmission planetary gear train rehabilitation device according to claim 2, characterized in that: The non-circular driving wheel (3) and the non-circular driven wheel (1) are in the form of variable tooth thickness, and the tooth profile thereof changes linearly along the displacement coefficient in the axial direction; the negative displacement end face of the non-circular driving wheel (3) meshes with the positive displacement end face of the non-circular driven wheel (1) to form a variable tooth thickness non-circular gear pair, and the backlash is reduced by fine-tuning the axial position of the variable tooth thickness non-circular gear.

4. The variable-thickness non-circular gear transmission planetary gear train rehabilitation device according to claim 1, characterized in that: It also comprises a right seat (10) and a left seat (12) which are symmetrically arranged on both sides of the swing frame (11) and are fixedly connected to the frame (9).

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