Speed reducer with high load

Abstract

The utility model relates to a speed reducer with high load. The speed reducer comprises a first speed reduction part and a second speed reduction part, the first speed reduction part comprises an input gear and a spur gear, and the input 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 outer shell at equal intervals, the outer shell is arranged on the RV gear in a sleeving mode, 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. According to the invention, through the design of the pin shaft and the RV gear, the gear gap is small, the impact resistance is strong, and the number of the RV gear and the pin shaft which are engaged at the same time is large; the revolution speed of the RV gear is slowed down, the vibration is reduced, the direct junction part (input gear) of the motor can be reduced, the inertia is reduced, and the rotational inertia is reduced, so that the load and the service life of the speed reducer are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, and more specifically to a reducer with a high load. 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] The application of reducers is very extensive, especially in robots; however, the reducers currently used on existing robots have complex structures and a large number of components. When in use, they vibrate greatly and have a large moment of inertia (moment of inertia), which affects the service life of the reducer; on the other hand, the existing reducers have low torsional rigidity and weak impact resistance, and thus cannot adapt to high-load operations.

[0004] Chinese patent document: CN216842921 U, announcement date 2022.06.28, discloses a simplified reducer for an industrial robot RV, 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 cannot adapt to high-load operations, has a complex structure, contains many parts, and has high manufacturing difficulty and manufacturing cost.

[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 speed reducer with high load, which has simple structure, small tooth gap, strong impact resistance, small vibration and small inertia.

[0007] The utility model provides a speed reducer with high load, comprising a first speed reducing part and a second speed reducing part; the first speed reducing part comprises an input gear and a spur gear, and the input gear is meshed with the spur gear; the second speed reducing part comprises a housing, 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 RV gear is installed on the eccentric part of the crankshaft through the rolling bearing; a plurality of pin shafts are arranged at equal intervals on the inner side wall of the housing, the housing is sleeved on the RV gear, the distance between adjacent pin shafts is the same as the tooth pitch of the RV gear, and the number of teeth of the pin shaft is one more than that of the RV gear.

[0008] 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.

[0009] Furthermore, the high-load reducer also includes a front-end support flange, a rear-end support flange and a reinforcement; the reinforcement and the front-end support flange are integrally connected, and the other end of the reinforcement is connected to the rear-end support flange; a reinforcement through hole is provided on the RV gear between the two crank shaft through holes, the reinforcement is located in the reinforcement through hole, and the front-end support flange and the rear-end support flange are located at both ends of the outer shell.

[0010] Furthermore, radial thrust ball bearings are installed at both ends of the pin shaft.

[0011] Furthermore, the reduction ratio formula obtained by adding the first reduction unit and the second reduction unit is:

[0012] in Z1 is the number of teeth on the input gear, Z2 is the number of teeth on the spur gear, Z3 is the number of teeth on the RV gear, Z4 is the number of pins, and i is the reduction ratio.

[0013] The high-load reducer of the utility model has a small tooth gap, strong impact resistance, and a large number of simultaneous engagements of the RV gear and the pin shaft through the design of the pin shaft and the RV gear; the revolution speed of the RV gear is slowed down, the vibration is reduced, the direct connection part (input gear) of the motor can be reduced, the inertia is reduced, and the moment of inertia is reduced, thereby increasing the load and service life of the reducer; in addition, the RV gear is installed on the eccentric part of the crankshaft through a rolling bearing, which can achieve excellent starting power, low wear, long service life and small tooth gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A simplified structural schematic diagram of a high-load reducer provided in an embodiment of the utility model.

[0015] Figure 2 for Figure 1 Schematic diagram of the partial cross-sectional structure of a reducer with high load.

[0016] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of a reducer with high load.

[0017] Figure 4 for Figure 1 Schematic diagram of the planar structure of a reducer with high load.

[0018] Figure 5 for Figure 1 Schematic diagram of the structure of a reducer with high load.

[0019] Figure 6 for Figure 1 Schematic diagram of the structure of the reducer with high load from another perspective.

[0020] Figure 7 for Figure 1 Schematic diagram of the structure of the front end support flange, rear end support flange and reinforcement of a reducer with high load.

[0021] Figure 8 for Figure 1 Schematic diagram of the structure of the front end support flange, rear end support flange and reinforcement of a reducer with high load.

[0022] The reference numerals and components involved in the drawings are as follows:

[0023] 1. First reduction gear 11, input gear 12, spur 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 DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] Example 1

[0031] Figure 1 A simplified structural diagram of a high-load reducer provided in an embodiment of the utility model. Figure 2 for Figure 1 Schematic diagram of the partial cross-section structure of the reducer with high load. Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of a reducer with high load. Figure 4 for Figure 1 Schematic diagram of the planar structure of the reducer with high load, Figure 5 for Figure 1 Schematic diagram of the structure of the reducer with high load, Figure 6 for Figure 1 Another view of the structure of the reducer with high load. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The high-load reducer provided by the embodiment of the utility model includes a first reduction part 1 and a second reduction part 2; the first reduction part 1 includes an input gear 11 and a spur gear 12, and the input gear 11 is meshed with the spur gear 12; the second reduction part 2 includes a housing 21, a pin 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 through the rolling bearing 23; a plurality of pins 22 are arranged at equal intervals on the inner side wall of the housing 21, and the housing 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.

[0032] Specifically, Figure 3 , 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 .

[0033] It should be noted that the rotation of the input shaft is transmitted from the input gear 11 to the spur gear 12 and is reduced 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; 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 the same tooth pitch; if the housing 21 is fixed and the spur gear 12 is rotated, the RV gear 24 will also move eccentrically due to the eccentric movement of the crankshaft 25. 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 will be output to the shaft of the second reduction unit 2; if the shaft is fixed, the housing 21 becomes the output side.

[0034] 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:

[0035] in Z 1 is the number of teeth of input gear 11, Z 2 is the number of teeth of spur gear 12, Z 3 is the number of teeth of RV gear 24, Z 4 is the number of pins 22, and i is the reduction ratio.

[0036] The high-load reducer of the utility model has a small tooth gap and strong impact resistance through the design of the pin shaft 22 and the RV gear 24, 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 achieve excellent starting power, small wear, long service life and small tooth gap.

[0037] Figure 7 for Figure 1 Schematic diagram of the structure of the front support flange, rear support flange and reinforcement of the reducer with high load. Figure 8 for Figure 1 A schematic diagram of the structure of the front end support flange, rear end support flange and reinforcement of a high-load reducer. Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8The high-load reducer of the utility model also includes a front end support flange 3, a rear end support flange 4 and a reinforcement 5; the reinforcement 5 and the front end support flange 3 are connected as a whole, and the other end of the reinforcement 5 is connected to the rear end support flange 4; a reinforcement through hole 27 is 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, and the front end support flange 3 and the rear end support flange 4 are located at both ends of the housing 21.

[0038] 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.

[0039] like Figure 2 , Figure 3 As shown, in the utility model, radial thrust ball bearings 6 are installed at both ends of the pin shaft 22 .

[0040] It should be noted that the radial thrust ball bearing 6 is installed, so it can support external loads, has high moment rigidity and large allowable moment; it can reduce the number of required components, facilitate installation, improve reliability, and reduce total cost.

[0041] Based on the above description, it can be seen that the advantages of the utility model are:

[0042] 1. The high-load reducer of the utility model has a small tooth gap and strong impact resistance through the design of the pin shaft 22 and the RV gear 24, 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.

[0043] 2. The high-load reducer of the utility model has the RV gear 24 installed on the eccentric part of the crankshaft 25 via the rolling bearing 23, which can achieve excellent starting power, low wear, long service life and small tooth clearance.

[0044] 3. The utility model has a high-load reducer, in which the crankshaft 25 is supported by the front-end support flange 3 and the rear-end support flange 4, and has high torsional rigidity, low vibration, and strong impact resistance, thereby increasing the reducer load.

[0045] 4. The high-load reducer of the utility model has a radial thrust ball bearing 6 that can support external loads, has high moment rigidity and large allowable moment; it can reduce the number of required components, facilitate installation, improve reliability, and reduce total cost.

[0046] 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 speed reducer with high load, 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) and a spur gear (12), and the input gear (11) and the spur gear (12) are meshed; The second speed reduction unit (2) comprises a housing (21), a pin shaft (22), a rolling bearing (23), an RV gear (24) and a crank shaft (25); one end of the crank shaft (25) is connected to the spur gear (12), and the RV gear (24) is installed on the eccentric part of the crank shaft (25) via the rolling bearing (23); A plurality of pin shafts (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 pin shafts (22) is the same as the tooth pitch of the RV gear (24); and the pin shaft (22) has one more tooth than the RV gear (24).

2. The high-load reducer according to claim 1, characterized in that: Three crankshaft through holes (26) are provided on the RV gear (24), the angle between adjacent crankshaft through holes (26) is 120 degrees, the rolling bearing (23) is mounted on the crankshaft through holes (26), and the eccentric portion of the crankshaft (25) is inserted into the rolling bearing (23).

3. The high-load reducer according to claim 2, characterized in that: The high-load reducer further comprises 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); A reinforcement member through hole (27) is provided between the two crankshaft through holes (26) on the RV gear (24), the reinforcement member (5) is located in the reinforcement member through hole (27), and the front end support flange (3) and the rear end support flange (4) are located at two ends of the housing (21).

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

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