Speed reducer convenient for cable insertion

Abstract

The utility model relates to a speed reducer convenient for cable insertion. The speed reducer comprises a first speed reduction part and a second speed reduction part, the first speed reduction part comprises an input gear, a spur gear and a sun gear, the sun gear comprises a large gear and a small gear, the large gear is meshed with the input gear, and the small gear is meshed with the spur gear; the second speed reduction part comprises a shell, a pin shaft, a rolling bearing, an RV gear and a crankshaft; one end of the crankshaft is connected with the spur gear, and the eccentric part of the crankshaft is provided with an RV gear through a rolling bearing; a plurality of pin shafts are arranged on the inner side wall of the shell at equal intervals, the RV gear is sleeved with the shell, the distance between every two adjacent pin shafts is the same as the tooth pitch of the RV gear, and the number of teeth of the pin shafts is one more than that of the RV gear; a through cable containing cavity is formed in the middle of the center gear and the middle of the RV gear. The device has the advantages that a cable can be inserted into the speed reducer, and the space-saving design of the device is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, and more specifically to a reducer which is convenient for inserting cables. Background Art

[0002] The reducer is a relatively precise machine. Its purpose is to reduce the speed and increase the torque. The reducer matches the speed and transmits the torque between the prime mover and the working machine or the actuator. It is widely used in modern machinery. According to the purpose, the reducer can be divided into two categories: general reducer and special reducer. The design, manufacturing and use characteristics of the two are different.

[0003] Reducers are widely used, especially in robots. However, the reducers currently used in existing robots cannot have cables inserted inside them. All lines on the robot need to bypass the reducer, resulting in a waste of space.

[0004] Chinese patent document: CN216842921 U, announcement date 2022.06.28, discloses an industrial robot RV simplified reducer, including: a planetary carrier, a pinion housing, a double eccentric shaft, a cycloid wheel, a spacer, a bearing, a needle pin and a round end cover connected to the stopper of the pinion housing, the planetary carrier includes a main and auxiliary discs, a column pin and a pin sleeve, and the cycloid wheel adopts the best positive equidistance-positive displacement shaping. The advantages are: eliminating the influence of the original planetary-level manufacturing accuracy, not only reducing the manufacturing difficulty, but also reducing the cost, and also solving the technical problems of reducer backlash, heat generation and extended service life. However, this technical solution has a complex structure and contains many parts, and it is impossible to insert cables inside it.

[0005] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0006] The utility model aims to provide a reducer which is convenient for inserting cables. The reducer which is convenient for inserting cables has a simple structure and can insert cables inside the reducer, thus realizing a space-saving design of the device.

[0007] The utility model provides a reducer which is convenient for inserting cables, comprising a first reduction part and a second reduction part; the first reduction part comprises an input gear, a spur gear and a central gear, the central gear comprises a large gear and a small gear, the large gear is meshed with the input gear, and the small gear is meshed with the spur gear;

[0008] The second deceleration part includes a shell, a pin shaft, a rolling bearing, an RV gear and a crank shaft; one end of the crank shaft is connected to the spur gear, and the RV gear is installed on the eccentric part of the crank shaft through the rolling bearing; a plurality of pin shafts are arranged at equal intervals on the inner wall of the shell, and the shell is sleeved on the RV gear, and the distance between adjacent pin shafts is the same as the tooth pitch of the RV gear, and the pin shaft has one more tooth than the RV gear; a cable accommodating cavity is provided in the middle of the center gear and the RV gear.

[0009] Furthermore, three crankshaft through holes are provided on the RV gear, the angle between adjacent crankshaft through holes is 120 degrees, the rolling bearings are installed on the crankshaft through holes, and the eccentric part of the crankshaft is inserted into the rolling bearings.

[0010] Furthermore, the reducer that is convenient for inserting cables also includes a front end support flange, a rear end support flange and a reinforcement member; the reinforcement member and the front end support flange are integrally connected, and the other end of the reinforcement member is connected to the rear end support flange; two reinforcement member through holes are provided on the RV gear between the two crank shaft through holes, the reinforcement member is located in the reinforcement member through holes, the front end support flange and the rear end support flange are located at both ends of the outer shell, and a through cable accommodating cavity is provided in the middle of the front end support flange and the rear end support flange.

[0011] Furthermore, radial thrust ball bearings are installed at both ends of the pin shaft.

[0012] Furthermore, the reduction ratio formula obtained by adding the first reduction unit and the second reduction unit is:

[0013] in Z1 is the number of teeth on the input gear, Z2 is the number of teeth on the large gear, Z3 is the number of teeth on the small gear, Z4 is the number of teeth on the spur gear, Z5 is the number of teeth on the RV gear, Z6 is the number of pins, and i is the reduction ratio.

[0014] The utility model provides a reducer which is convenient for inserting cables. By providing a penetrating cable accommodating cavity in the middle of the central gear and the RV gear, the cables can be inserted inside the reducer when the reducer is in use, thus realizing a space-saving design of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A simplified structural schematic diagram of a reducer for facilitating the insertion of cables provided in an embodiment of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the partial cross-sectional structure of the reducer which is convenient for inserting cables.

[0017] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the reducer which facilitates the insertion of cables.

[0018] Figure 4 for Figure 1 Schematic diagram of the internal planar structure of the reducer which facilitates the insertion of cables.

[0019] Figure 5 for Figure 1 Schematic diagram of the planar structure of the front end support flange, rear end support flange and reinforcement of the reducer which is convenient for inserting cables.

[0020] Figure 6 for Figure 1 A schematic diagram of the planar structure of the front end support flange, rear end support flange and reinforcement of the reducer, which is convenient for inserting cables.

[0021] The reference numerals and components involved in the drawings are as follows:

[0022] 1. First reduction gear 11, input gear 12, spur gear

[0023] 13. Center gear 14. Large gear 15. Small gear

[0024] 2. Second speed reducing unit 21, housing 22, pin

[0025] 23. Rolling bearing 24. RV gear 25. Crankshaft

[0026] 26. Crankshaft through hole 27. Reinforcement through hole 3. Front end support flange

[0027] 4. Rear end support flange 5. Reinforcement 6. Radial thrust ball bearing

[0028] 7. Cable accommodating cavity DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Example 1

[0032] Figure 1A simplified schematic diagram of a reducer for inserting cables provided in an embodiment of the utility model. Figure 2 for Figure 1 The schematic diagram of the partial cross-section structure of the reducer is convenient for inserting cables. Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the reducer is convenient for inserting cables. Figure 4 for Figure 1 The schematic diagram of the internal plan structure of the reducer is convenient for inserting cables. Figure 1 , Figure 2 , Figure 3 , Figure 4 The reducer for facilitating the insertion of cables provided in an embodiment of the utility model comprises a first reduction unit 1 and a second reduction unit 2; the first reduction unit 1 comprises an input gear 11, a spur gear 12 and a central gear 13, the central gear 13 comprises a large gear 14 and a small gear 15, the large gear 14 is meshed with the input gear 11, and the small gear 15 is meshed with the spur gear 12; the second reduction unit 2 comprises a housing 21, a pin 22, a rolling bearing 23, an RV gear 24 and a crankshaft 25; the crankshaft 25 One end is connected to the spur gear 12, and the RV gear 24 is installed on the eccentric part of the crank shaft 25 through the rolling bearing 23; a plurality of pins 22 are evenly spaced on the inner wall of the shell 21, and the shell 21 is sleeved on the RV gear 24, and the distance between adjacent pins 22 is the same as the tooth pitch of the RV gear 24, and the pin 22 has one more tooth than the RV gear 24; a penetrating cable accommodating cavity 7 is provided in the middle of the center gear 13 and the RV gear 24.

[0033] Specifically, Figure 2 , Figure 4 As shown, three crankshaft through holes 26 are provided on the RV gear 24 , and the angle between adjacent crankshaft through holes 26 is 120 degrees. The rolling bearing 23 is installed on the crankshaft through holes 26 , and the eccentric part of the crankshaft 25 is inserted into the rolling bearing 23 .

[0034] like Figure 1As shown, it should be noted that the rotation of the input shaft is transmitted from the input gear 11 to the spur gear 12 through the central gear 13, and is reduced in speed according to the gear ratio; the spur gear 12 is connected to the crankshaft 25 and becomes the input of the second reduction unit 2, and the RV gear 24 is installed on the eccentric part of the crankshaft 25 through the rolling bearing 23; in addition, the pin shaft 22 with only one more tooth than the RV gear 24 on the inner side of the housing 21 is arranged with an equal pitch; if the housing 21 is fixed and the spur gear 12 is rotated, the RV gear 24 also moves eccentrically due to the eccentric movement of the crankshaft 24; at this time, if the crankshaft 25 rotates one circle, the RV gear 24 will rotate one tooth in the opposite direction of the crankshaft 25, and this rotation is output to the shaft of the second reduction unit; when the shaft is fixed, the housing 21 side becomes the output side.

[0035] like Figure 1 As shown, the reduction ratio formula obtained by adding the first reduction unit 1 and the second reduction unit 2 of the utility model is:

[0036] in Z1 is the number of teeth of the input gear 11, Z2 is the number of teeth of the large gear 14, Z3 is the number of teeth of the small gear 15, Z4 is the number of teeth of the spur gear 12, Z5 is the number of teeth of the RV gear 24, Z6 is the number of roots of the pin shaft 22, and i is the reduction ratio.

[0037] The reducer of the utility model is convenient for inserting cables. By providing a penetrating cable accommodating cavity 7 in the middle of the central gear 13 and the RV gear 24, the cables can be inserted inside the reducer when the reducer is in use, thereby realizing a space-saving design of the device.

[0038] In addition, the reducer of the utility model is convenient for inserting cables. Through the design of the pin shaft 22 and the RV gear 24, the tooth gap is small, the impact resistance is strong, and the number of simultaneous engagements of the RV gear 24 and the pin shaft 22 is large; the revolution speed of the RV gear 24 is slowed down, the vibration is reduced, the input gear 11 of the motor direct joint part can be reduced, the inertia is reduced, and the moment of inertia is reduced, thereby improving the service life of the reducer; in addition, the RV gear 24 is installed on the eccentric part of the crank shaft 25 through the rolling bearing 23, which can have excellent starting power, small wear, long service life and small tooth gap.

[0039] Figure 5 for Figure 1 The schematic diagram of the planar structure of the front support flange, rear support flange and reinforcement of the reducer, which is convenient for inserting cables. Figure 6 for Figure 1 The schematic diagram of the planar structure of the front support flange, rear support flange and reinforcement of the reducer is convenient for inserting cables. Figure 3 , Figure 5 , Figure 6The reducer of the utility model which is convenient for inserting cables also includes a front end support flange 3, a rear end support flange 4 and a reinforcement member 5; the reinforcement member 5 and the front end support flange 3 are connected as a whole, and the other end of the reinforcement member 5 is connected to the rear end support flange 4; two reinforcement member through holes 27 are provided on the RV gear 24 between the two crank shaft through holes 26, and the reinforcement member 5 is located in the reinforcement member through holes 27, the front end support flange 3 and the rear end support flange 4 are located at both ends of the housing 21, and a penetrating cable accommodating cavity 7 is provided in the middle of the front end support flange 3 and the rear end support flange 4.

[0040] It should be noted that the crankshaft 25 is supported by the front end support flange 3 and the rear end support flange 4 in the reducer, and has high torsional rigidity, low vibration, and strong impact resistance, thereby increasing the reducer load.

[0041] like Figure 2 , Figure 3 As shown, radial thrust ball bearings 6 are installed at both ends of the pin shaft 22. It should be noted that the radial thrust ball bearings 6 are installed, so that the external load can be supported, the moment rigidity and the allowable moment are large; the number of required components can be reduced, the installation is convenient, the reliability is improved, and the total cost is reduced.

[0042] Based on the above description, it can be seen that the advantages of the utility model are:

[0043] 1. The reducer of the utility model is convenient for inserting cables. By providing a penetrating cable accommodating cavity 7 in the middle of the central gear 13 and the RV gear 24, the cables can be inserted inside the reducer when the reducer is in use, thereby realizing a space-saving design of the device.

[0044] 2. The reducer of the utility model is convenient for inserting cables. Through the design of the pin shaft 22 and the RV gear 24, the tooth gap is small, the impact resistance is strong, and the number of simultaneous engagements of the RV gear 24 and the pin shaft 22 is large; the revolution speed of the RV gear 24 is slowed down, the vibration is reduced, the input gear 11 of the motor direct joint part can be reduced, the inertia is reduced, and the moment of inertia is reduced, thereby improving the service life of the reducer.

[0045] 3. The reducer of the utility model is convenient for inserting cables, and the RV gear 24 is installed on the eccentric part of the crank shaft 25 through the rolling bearing 23, which can achieve excellent starting power, small wear, long service life and small tooth gap.

[0046] 4. The reducer of the utility model is convenient for inserting cables, and the crankshaft 25 is supported by the front support flange 3 and the rear support flange 4 in the reducer, which has high torsional rigidity, low vibration and strong impact resistance, thereby increasing the load of the reducer.

[0047] 5. The reducer of the utility model is convenient for inserting cables, and the radial thrust ball bearing 6 can support external loads, has a large moment rigidity and allowable moment; the number of required components can be reduced, installation is convenient, reliability is improved, and total cost is reduced.

[0048] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A reducer that is convenient for inserting cables, characterized in that: The invention comprises a first reduction part (1) and a second reduction part (2); the first reduction part (1) comprises an input gear (11), a spur gear (12) and a central gear (13); the central gear (13) comprises a large gear (14) and a small gear (15); the large gear (14) is meshed with the input gear (11); and the small gear (15) is meshed with the spur gear (12); The second speed reduction unit (2) comprises a housing (21), a pin shaft (22), a rolling bearing (23), an RV gear (24) and a crankshaft (25); one end of the crankshaft (25) is connected to the spur gear (12), and the RV gear (24) is installed on the eccentric part of the crankshaft (25) via the rolling bearing (23); A plurality of pins (22) are arranged at equal intervals on the inner side wall of the housing (21); the housing (21) is sleeved on the RV gear (24); the distance between adjacent pins (22) is the same as the tooth pitch of the RV gear (24); and the pin (22) has one more tooth than the RV gear (24); A cable accommodating cavity (7) is provided in the middle of the central gear (13) and the RV gear (24).

2. The reducer for facilitating insertion of cables according to claim 1, characterized in that: Three crankshaft through holes (26) are provided on the RV gear (24), and the angle between adjacent crankshaft through holes (26) is 120 degrees. The rolling bearing (23) is installed on the crankshaft through holes (26), and the eccentric part of the crankshaft (25) is inserted into the rolling bearing (23).

3. The reducer for facilitating insertion of cables according to claim 2, characterized in that: The reducer that facilitates the insertion of cables also includes a front end support flange (3), a rear end support flange (4) and a reinforcement member (5); The reinforcement member (5) and the front end support flange (3) are connected as one piece, and the other end of the reinforcement member (5) is connected to the rear end support flange (4); Two reinforcement through holes (27) are provided on the RV gear (24) between the two crank shaft through holes (26); the reinforcement (5) is located in the reinforcement through hole (27); the front end support flange (3) and the rear end support flange (4) are located at two ends of the housing (21); and a through cable accommodating cavity (7) is provided in the middle of the front end support flange (3) and the rear end support flange (4).

4. The reducer for facilitating insertion of cables according to claim 1, characterized in that: Radial thrust ball bearings (6) are installed at both ends of the pin shaft (22).

5. The reducer for facilitating insertion of cables according to claim 1, characterized in that: The reduction ratio formula obtained by adding the first reduction part (1) and the second reduction part (2) is: in Z1 is the number of teeth of the input gear (11), Z2 is the number of teeth of the large gear (14), Z3 is the number of teeth of the small gear (15), Z4 is the number of teeth of the spur gear (12), Z5 is the number of teeth of the RV gear (24), Z6 is the number of pins (22), and i is the reduction ratio.

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