Speed reduction transmission device

Abstract

The utility model discloses a speed reduction transmission device which comprises a machine base, a driving motor arranged on the machine base and a transmission shaft movably arranged in the machine base, a driving wheel is arranged on an output shaft of the driving motor, a transmission wheel is arranged on the transmission shaft, a transmission belt is arranged on the driving wheel and the transmission wheel, and the diameter of the driving wheel is smaller than that of the transmission wheel. A tensioning device is arranged between the driving wheel and the transmission wheel on the machine base and comprises a tensioning base, a pair of tensioning wheel shafts symmetrically arranged on the two sides of the center connecting line of the driving wheel and the transmission wheel is arranged on the tensioning base, tensioning wheels are arranged on the tensioning wheel shafts, and the tensioning wheels are connected with the tensioning wheel shafts. A supporting shaft is further movably arranged in the tensioning seat, the axis of the supporting shaft coincides with the axis of the output shaft of the driving motor, the supporting shaft is connected with the output shaft of the driving motor, and the transmission belt is tensioned on the inner side of the tensioning wheel. The speed reduction transmission device is particularly suitable for occasions with narrow installation space.

Description

Technical Field

[0001] The utility model relates to a transmission device, in particular to a reduction transmission device. Background Art

[0002] like Figure 1 and Figure 2 As shown, a traditional reduction transmission device, the structure of which includes: a machine base 1, a servo motor 3 arranged on the machine base 1 through a motor mounting plate 2, and a transmission shaft 4 movably arranged in the machine base 1 through a bearing, the output shaft of the servo motor 3, i.e., the driving wheel shaft, is provided with a driving synchronous pulley 31, and the transmission shaft 4 is provided with a transmission synchronous pulley 41 having a diameter larger than the driving synchronous pulley 31, and the driving synchronous pulley 31 and the transmission synchronous pulley 41 are provided with a synchronous belt 5 as a transmission belt. In actual use, the tension of the synchronous belt 5 is achieved by adjusting the position of the motor mounting plate 2. The disadvantages of this adjustment method are:

[0003] 1. Since the driving synchronous pulley 31 is installed on the output shaft of the servo motor 3, and the outer end of the output shaft of the servo motor 3 has no supporting point, after the synchronous belt 5 is tightened, the driving synchronous pulley 31 will sag to a certain extent under the action of the tensioning force, resulting in the driving synchronous pulley 31 and the driven synchronous pulley 41 being not parallel, affecting the normal operation of the synchronous belt 5.

[0004] 2. Since the reduction ratio between the driving synchronous pulley 31 and the transmission synchronous pulley 41 is usually large, and due to the limitation of the installation space, the center distance between the driving synchronous pulley 31 and the transmission synchronous pulley 41 is small, resulting in a small wrap angle α between the driving synchronous pulley 31 and the synchronous belt 5 (less than 140°). During the rapid transmission of torque, the synchronous belt 5 may jump gears or be damaged, affecting the normal operation of the synchronous belt 5. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a reduction transmission device which can prevent the driving wheel from sagging and increase the wrap angle between the driving belt and the driving wheel.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a reduction transmission device, comprising: a machine base, a driving motor arranged on the machine base, and a transmission shaft movably arranged in the machine base, a driving wheel is arranged on the output shaft of the driving motor, a transmission wheel is arranged on the transmission shaft, a transmission belt is arranged on the driving wheel and the transmission wheel, and the diameter of the driving wheel is smaller than the diameter of the transmission wheel; a tensioning device is arranged between the driving wheel and the transmission wheel on the machine base, and the tensioning device comprises: a tensioning seat, a pair of tensioning wheel shafts symmetrically arranged on both sides of the center line between the driving wheel and the transmission wheel are arranged on the tensioning seat, a tensioning wheel is arranged on the tensioning wheel shaft, and a support shaft whose axis center line coincides with the axis center line of the output shaft of the driving motor and is connected to the output shaft of the driving motor is also movably arranged in the tensioning seat, and the transmission belt is tensioned on the inner side of the tensioning wheel.

[0007] As a preferred solution, in the reduction transmission device, the drive motor is arranged on the machine base through a motor mounting plate.

[0008] As a preferred solution, in the reduction transmission device, a pair of tensioning wheel shafts are arranged on the motor mounting plate.

[0009] As a preferred solution, in the reduction transmission device, at least two fixed columns are arranged on the motor mounting plate along the center line between the driving wheel and the transmission wheel and facing the tensioning seat, and the pair of fixed columns are penetrated in the tensioning seat.

[0010] As a preferred solution, in the reduction transmission device, the diameters of the pair of tension wheels are D1 and D2 respectively, the diameter of the driving wheel is D3, and the distance between the center lines of the pair of tension wheels is L, then

[0011]

[0012] As a preferred solution, in the reduction transmission device, the diameters of the pair of tension wheels are equal, that is, D1 = D2.

[0013] As a preferred solution, in the reduction transmission device, the driving wheel and the transmission wheel are both synchronous pulleys, and correspondingly, the transmission belt is a synchronous belt.

[0014] As a preferred solution, in the reduction transmission device, the drive motor is a servo motor.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model provides a support shaft connected to the driving wheel shaft on the tensioning seat, so that the driving wheel shaft also has a support point at the outer end, ensuring that the driving wheel will not sag after tensioning, thus ensuring that the driving wheel and the transmission wheel are always parallel to each other, thereby ensuring the normal operation of the synchronous belt.

[0017] 2. The utility model sets a pair of tensioning wheels in the tensioning device so that the transmission belt is tensioned on the inner side of the pair of tensioning wheels, thereby increasing the wrap angle between the transmission belt and the driving wheel, ensuring that the transmission belt will not jump gears or be damaged during the rapid transmission of torque, thereby ensuring the normal operation of the transmission belt.

[0018] 3. The utility model sets a fixed column on the motor mounting plate along the center line between the driving wheel and the transmission wheel and facing the tensioning seat, and penetrates the fixed column into the tensioning seat, so that the tensioning seat is more stable relative to the machine base.

[0019] 4. The utility model controls the distance between the center lines of a pair of tensioning wheels to be It ensures that the wrap angle between the transmission belt and the driving wheel is greater than 90 degrees, thereby further increasing the wrap angle between the transmission belt and the driving wheel, ensuring that the transmission belt will not jump gears or be damaged during the rapid transmission of torque, thereby ensuring the normal operation of the transmission belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the reduction transmission device described in the background technology.

[0021] Figure 2 It is a structural schematic diagram of the reduction transmission device described in the background technology.

[0022] Figure 1 to Figure 2 The reference numerals in the drawings are: 1, machine base, 2, motor mounting plate, 3, servo motor, 31, active synchronous pulley, 4, transmission shaft, 41, transmission synchronous pulley, 5, synchronous belt.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the reduction transmission device of the utility model.

[0024] Figure 4 It is a structural schematic diagram of the reduction transmission device of the utility model.

[0025] Figure 5 It is a partial structural schematic diagram of the reduction transmission device of the utility model.

[0026] Figures 3 to 5The reference numerals in the drawings are: 1, machine base, 2, motor mounting plate, 3, servo motor, 31, driving synchronous pulley, 4, transmission shaft, 41, transmission synchronous pulley, 5, synchronous belt, 6, tensioning seat, 61, supporting shaft, 62, tensioning wheel shaft, 621, tensioning wheel, 63, tensioning wheel shaft, 631, tensioning wheel, 64, fixed column, 65, fixed column. DETAILED DESCRIPTION

[0027] The following is combined with Figures 3 to 5 , a specific implementation scheme of a reduction transmission device described in the utility model is described in detail.

[0028] like Figure 3 , Figure 4 and Figure 5 As shown, a reduction transmission device described in the utility model comprises: a machine base 1, a servo motor 3 arranged on the machine base 1 through a motor mounting plate 2, and a transmission shaft 4 movably arranged in the machine base 1, an output shaft of the servo motor 3, i.e., a driving wheel shaft, is provided with an active synchronous pulley 31, a transmission synchronous pulley 41 is provided on the transmission shaft 4, a synchronous belt 5 is provided on the active synchronous pulley 31 and the transmission synchronous pulley 41, and the diameter of the active synchronous pulley 31 is smaller than the diameter of the transmission synchronous pulley 41; the motor mounting plate 2 is provided between the active synchronous pulley 31 and the transmission synchronous pulley 41 A tensioning device is arranged between the servo motor 3 and the servo motor 3. The tensioning device includes: a tensioning seat 6, a pair of tensioning wheel shafts 62 and 63 symmetrically arranged on both sides of the center line between the active synchronous pulley 31 and the transmission synchronous pulley 41 are arranged on the tensioning seat 6, a tensioning wheel 621 is arranged on the tensioning wheel shaft 62, and a tensioning wheel 631 is arranged on the tensioning wheel shaft 63. The synchronous belt 5 is tensioned on the inner side of the tensioning wheels 621 and 631. The tensioning seat 6 is also provided with a support shaft 61 whose axis coincides with the axis of the output shaft of the servo motor 3 and is connected to the output shaft of the servo motor 3 through a bearing. In this embodiment, two fixed columns 64 and 65 are arranged on the motor mounting plate 2 along the center line between the active synchronous pulley 31 and the transmission synchronous pulley 41 and facing the tensioning seat 6, and the two fixed columns 64 and 65 are penetrated in the tensioning seat 6.

[0029] In actual application, the sizes of the tensioning wheels 621 and 631 are the same, that is, the diameter D1 of the tensioning wheel 621 is equal to the diameter D2 of the tensioning wheel 631. Assuming that the diameter of the active synchronous pulley 31 is D3, the distance between the center lines of the tensioning wheels 621 and 631 is This makes the wrap angle β between the active synchronous belt pulley 31 and the synchronous belt 5 greater than 180 (see Figure 5 shown).

[0030] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made to the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A reduction transmission device, comprising: A machine base, a driving motor arranged on the machine base, and a transmission shaft movably arranged in the machine base, a driving wheel is arranged on the output shaft of the driving motor, a transmission wheel is arranged on the transmission shaft, a transmission belt is arranged on the driving wheel and the transmission wheel, and the diameter of the driving wheel is smaller than the diameter of the transmission wheel; it is characterized in that a tensioning device is arranged between the driving wheel and the transmission wheel on the machine base, and the tensioning device comprises: a tensioning seat, a pair of tensioning wheel shafts symmetrically arranged on both sides of the center line between the driving wheel and the transmission wheel are arranged on the tensioning seat, a tensioning wheel is arranged on the tensioning wheel shaft, and a support shaft whose axis center line coincides with the axis center line of the output shaft of the driving motor and is connected to the output shaft of the driving motor is also movably arranged in the tensioning seat, and the transmission belt is tensioned on the inner side of the tensioning wheel.

2. A reduction transmission device according to claim 1, characterized in that: The driving motor is arranged on the machine base through a motor mounting plate.

3. A reduction transmission device according to claim 2, characterized in that: A pair of tension wheel shafts are arranged on the motor mounting plate.

4. A reduction transmission device according to claim 2, characterized in that: At least two fixed columns are arranged on the motor mounting plate along the center line between the driving wheel and the transmission wheel and facing the tensioning seat, and the pair of fixed columns penetrates the tensioning seat.

5. A reduction transmission device according to claim 1, characterized in that: The diameters of a pair of tension wheels are D1 and D2 respectively, the diameter of the driving wheel is D3, and the distance between the center lines of the pair of tension wheels is L. Then 6. A reduction transmission device according to claim 5, characterized in that: The diameters of the pair of tension wheels are equal, that is, D1 = D2.

7. A reduction transmission device according to any one of claims 1 to 6, characterized in that: The driving wheel and the transmission wheel are both synchronous pulleys, and correspondingly, the transmission belt is a synchronous belt.

8. A reduction transmission device according to any one of claims 1 to 6, characterized in that: The driving motor is a servo motor.

9. A reduction transmission device according to claim 7, characterized in that: The driving motor is a servo motor.

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