Speed reducer with compact structure

Abstract

The utility model belongs to the technical field of speed reducers, and discloses a speed reducer with a compact structure, which comprises a lower shell, a lower convex shell is integrally arranged at the central position of the lower shell, an upper convex shell is mounted on the lower convex shell, and an upper cover body is integrally connected to the upper convex shell; the interiors of the lower convex shell and the upper convex shell are hollow, the lower convex shell is symmetrically provided with two arc-shaped through grooves, and the upper convex shell is provided with an arc-shaped blind groove; an input shaft and two planet shafts are installed between the lower shell and the upper cover body, a shaft body of the input shaft is integrally connected with a first crank shaft, and shaft bodies of the planet shafts are integrally connected with a second crank shaft; a balance wheel set is fixedly installed on a shaft body of the planet shaft, the two second crankshafts are matched with an output disc in a meshed mode, and therefore larger torque can be borne, larger impact force can be borne, and the use strength is guaranteed; according to the utility model, the output disc is not easy to be stressed in the horizontal and vertical directions, so that the whole structure is compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of speed reducers, and particularly relates to a speed reducer with a compact structure. Background Art

[0002] A speed reducer is an independent component composed of gear transmission, worm transmission, and gear-worm transmission enclosed in a rigid housing, and is commonly used as a speed reduction transmission device between a prime mover and a working machine. It plays a role in matching the rotational speed and transmitting torque between the prime mover and the working machine or actuator, and is widely used in modern machinery;

[0003] In the existing speed reducers, the power transmission mostly uses gears for connection, which has high requirements for the number of teeth and pitch of the gears. If the number of teeth is large, the processing requirements are high; if the pitch is small, the processing accuracy is low. Moreover, the teeth of the gears usually have weak torsional resistance, so they are prone to breakage, which reduces the service life. Another problem is that when using gears for speed reduction, multi-stage speed reduction is usually achieved by connecting and installing them in a horizontal direction. When the speed reduction is more than three stages, the horizontal distance of multiple groups of gears becomes very long, which expands the overall volume and is not conducive to the installation of small equipment. Summary of the Utility Model

[0004] Aiming at the problems raised in the above background art, the purpose of the present utility model is to provide a speed reducer with a compact structure.

[0005] To achieve the above technical purpose, the technical solution adopted by the present utility model is as follows:

[0006] A speed reducer with a compact structure includes a lower housing. A lower convex shell is integrally provided at the central position of the lower housing. An upper convex shell is installed on the lower convex shell. The upper convex shell is integrally connected to an upper cover body, and the upper convex shell is located at the central position of the upper cover body;

[0007] The lower convex shell and the upper convex shell are hollow inside. Two arc-shaped through grooves are symmetrically provided on the lower convex shell, and two arc-shaped blind grooves corresponding to the arc-shaped through grooves are provided on the upper convex shell;

[0008] An input shaft and two planetary shafts are installed between the lower housing and the upper cover body. The input shaft is rotatably installed at the axial center positions of the lower convex shell and the upper convex shell. The planetary shafts are rotatably installed in the arc-shaped through grooves and the arc-shaped blind grooves. A first crankshaft is integrally connected to the shaft body of the input shaft, and a second crankshaft is integrally connected to the shaft body of the planetary shaft. The second crankshaft is located in the arc-shaped blind groove;

[0009] A swing wheel group is fixedly installed on the shaft body of the planetary shaft. The swing wheel group is located in the arc-shaped through groove. The swing wheel group is meshed and matched with the first crankshaft, and the two second crankshafts are meshed and matched with an output disc.

[0010] Further defined, a step is provided at the end of the lower convex shell, and a buckle groove for buckling the step is provided on the upper convex shell. Such a design ensures the coaxial effect after the docking of the lower convex shell and the upper convex shell.

[0011] Further defined, bearings are respectively and matchingly installed on the input shaft and the planetary shaft. Such a design ensures the rotation effect of the input shaft and the planetary shaft.

[0012] Further defined, key grooves are provided on both the input shaft and the planetary shaft. Such a design is conducive to the installation of the installation part and ensuring the effect of driving the installation part to rotate.

[0013] Further defined, three eccentric wheel grooves are provided on both the first crankshaft and the second crankshaft, three pendulum wheels are provided in the corresponding pendulum wheel group, and three corresponding output disks are provided. Such a design has a good speed reduction effect and improves the speed reduction accuracy. Further, it increases the vertical stress, resulting in a good load-bearing effect and ensuring the service life.

[0014] Further defined, a spacer ring is installed between two adjacent pendulum wheels in the pendulum wheel group. Such a design allows the storage and retention of lubricating oil here to ensure the rotation effect.

[0015] Further defined, the two planetary shafts are installed on both sides of the input shaft at 180°. Such a design ensures the effectiveness and stability of speed reduction.

[0016] Further defined, the two planetary shafts have the same specification and model. Such a design is conducive to the replacement of spare parts.

[0017] Further defined, the contact surfaces between the first crankshaft, the second crankshaft, the pendulum wheel group and the output disk are all polished smoothly. Such a design ensures the matching effect.

[0018] Further defined, the lower convex shell and the upper convex shell are fixedly connected by screws. Such a design is conducive to disassembly and installation.

[0019] The beneficial effects of adopting the present utility model are as follows:

[0020] The present utility model uses the cooperation of pendulum wheels and crankshafts instead of gears to achieve speed reduction. Therefore, compared with the structure using gears, the production requirements are lower, which is more conducive to production. Moreover, the tooth pitch of the pendulum wheel is large and the contact surface is larger than that of the gear, so it can bear a greater torque and a greater impact force, ensuring the use strength.

[0021] The present utility model installs the output disk between the upper cover body and the lower housing, so that the output disk is not easily displaced in the horizontal and vertical directions under force, making the overall structure compact. Brief Description of the Drawings

[0022] The utility model can be further illustrated by the non - limiting embodiments shown in the drawings;

[0023] Figure 1 It is a schematic structural view of an embodiment of a compact speed reducer of the utility model;

[0024] Figure 2 It is an exploded structural view of an embodiment of a compact speed reducer of the utility model;

[0025] Figure 3 It is a partial structural view of an embodiment of a compact speed reducer of the utility model Figure 1 ;

[0026] Figure 4 It is a partial structural view of an embodiment of a compact speed reducer of the utility model Figure 2 ;

[0027] Figure 5 It is a sectional structural view of an embodiment of a compact speed reducer of the utility model;

[0028] The main element symbols are explained as follows:

[0029] Lower housing 1; Lower convex shell 2; Upper convex shell 3; Upper cover 4; Arc - shaped through - slot 5; Arc - shaped blind - slot 6; Input shaft 7; Planet shaft 8; First crankshaft 9; Second crankshaft 10; Oscillating wheel group 11; Output disk 12; Step 13; Buckle groove 14; Keyway 15; Spacer ring 16. Detailed Embodiment

[0030] In order to enable those skilled in the art to better understand the utility model, the technical solution of the utility model will be further described below with reference to the drawings and embodiments.

[0031] As Figures 1 to 5 shown, a compact speed reducer of the utility model includes a lower housing 1. A lower convex shell 2 is integrally provided at the central position of the lower housing 1. An upper convex shell 3 is installed on the lower convex shell 2, and the upper convex shell 3 is integrally connected with an upper cover 4. The upper convex shell 3 is located at the central position of the upper cover 4;

[0032] The interior of the lower convex shell 2 and the upper convex shell 3 is hollow. Two arc - shaped through - slots 5 are symmetrically provided on the lower convex shell 2, and two arc - shaped blind - slots 6 corresponding to the arc - shaped through - slots 5 are provided on the upper convex shell 3;

[0033] An input shaft 7 and two planetary shafts 8 are installed between the lower housing 1 and the upper cover 4. The input shaft 7 is rotatably installed at the central positions of the lower convex shell 2 and the upper convex shell 3. The planetary shafts 8 are rotatably installed in the arc-shaped through slots 5 and the arc-shaped blind slots 6. A first crank shaft 9 is integrally connected to the shaft body of the input shaft 7. A second crank shaft 10 is integrally connected to the shaft body of the planetary shaft 8. The second crank shaft 10 is located in the arc-shaped blind slot 6;

[0034] A pendulum wheel set 11 is fixedly installed on the shaft body of the planetary shaft 8. The pendulum wheel set 11 is located in the arc-shaped through slot 5. The pendulum wheel set 11 is meshed and matched with the first crank shaft 9. The two second crank shafts 10 are meshed and matched with an output disc 12.

[0035] In this embodiment, when using a reducer with a compact structure, the output end of the power mechanism is connected to the input shaft 7. When the input shaft 7 rotates, the first crank shaft 9 rotates accordingly. Then, the pendulum wheel set 11 that passes through the arc-shaped through slot 5 and is matched with the first crank shaft 9 rotates immediately. With the cooperation of the first crank shaft 9 and the pendulum wheel set 11, the first deceleration of the input shaft 7 is achieved. Because the crank shaft is an eccentric wheel structure, there is a contact neutral gear during the rotation process, and this neutral gear is the deceleration space. Therefore, when the speed is transmitted to the pendulum wheel set 11, a deceleration is performed once;

[0036] The rotation of the pendulum wheel set 11 drives the planetary shaft 8 to rotate. Because two groups of pendulum wheel sets 11 are meshed on both sides of the first crank shaft 9, the planetary shafts 8 on both sides will rotate synchronously. The rotation of the planetary shaft 8 causes the second crank shaft 10 to rotate. Similarly, the output disc 12 matched with the second crank shaft 10 will perform secondary deceleration;

[0037] The structure of the first crank shaft 9 and the second crank shaft 10 with three vertical eccentric wheels, as well as the three-layer structure of the matched pendulum wheel set 11 and the output disc 12, make the vertical load-bearing effect good and ensure the accuracy of driving deceleration. Moreover, even when one of the eccentric wheels in the first crank shaft 9 or the second crank shaft 10 or one of the pendulums in the pendulum wheel set 11 is damaged, it can also reduce the impact on the deceleration accuracy and ensure the use effect.

[0038] Preferably, a step 13 is provided at the end of the lower convex shell 2, and a buckle groove 14 for buckling the step 13 is provided on the upper convex shell 3. Such a design ensures the coaxial effect after the lower convex shell 2 and the upper convex shell 3 are butted. In fact, the structure for ensuring the coaxial effect after the lower convex shell 2 and the upper convex shell 3 are butted can also be considered according to specific situations.

[0039] Preferably, bearings are installed on both the input shaft 7 and the planetary shaft 8 in a matching manner. Such a design ensures the rotation effect of the input shaft 7 and the planetary shaft 8. In fact, the selection of bearings can also be considered according to specific situations.

[0040] Preferably, both the input shaft 7 and the planetary shaft 8 are provided with key grooves 15. Such a design is conducive to the installation of the installation parts and ensuring the effect of driving the installation parts to rotate. In fact, the structure of the mating connection can also be considered according to specific circumstances.

[0041] Preferably, both the first crankshaft 9 and the second crankshaft 10 are provided with three eccentric wheel grooves. The corresponding pendulum wheel group 11 is provided with three pendulum wheels, and the corresponding output disks 12 are three. Such a design has a good speed reduction effect and improves the speed reduction accuracy. Further, it improves the vertical stress, resulting in a good load-bearing effect and ensuring the service life. In fact, the number of eccentric wheel grooves on the first crankshaft 9 and the second crankshaft 10, as well as the number of corresponding pendulum wheels and output disks 12, can also be considered according to specific circumstances.

[0042] Preferably, a spacer ring 16 is installed between two adjacent pendulum wheels in the pendulum wheel group 11. Such a design allows the storage and retention of lubricating oil here to ensure the rotation effect. In fact, the thickness dimension and number of the spacer ring 16 can also be considered according to specific circumstances.

[0043] Preferably, the two planetary shafts 8 are installed on both sides of the input shaft 7 at 180°. Such a design ensures the effectiveness and stability of the speed reduction. In fact, the installation position of the planetary shaft 8 can also be considered according to specific circumstances.

[0044] Preferably, the two planetary shafts 8 have the same specification model. Such a design is conducive to the replacement of spare parts. In fact, the customization of the specification of the planetary shaft 8 can also be considered according to specific circumstances.

[0045] Preferably, the contact surfaces between the first crankshaft 9, the second crankshaft 10, the pendulum wheel group 11 and the output disk 12 are all polished smoothly. Such a design ensures the mating effect. In fact, the roughness after polishing can also be considered according to specific circumstances.

[0046] Preferably, the lower convex shell 2 and the upper convex shell 3 are fixedly connected by screws. Such a design is conducive to disassembly and installation. In fact, the connection structure between the lower convex shell 2 and the upper convex shell 3 can also be considered according to specific circumstances.

[0047] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A compact reducer, comprising a lower housing (1), characterized in that: A lower convex shell (2) is integrally provided at the center of the lower shell (1); an upper convex shell (3) is mounted on the lower convex shell (2); the upper convex shell (3) is integrally connected to an upper cover (4); and the upper convex shell (3) is located at the center of the upper cover (4); The lower convex shell (2) and the upper convex shell (3) are hollow inside, the lower convex shell (2) is symmetrically provided with two arc-shaped through grooves (5), and the upper convex shell (3) is provided with two arc-shaped blind grooves (6) whose positions correspond to the arc-shaped through grooves (5); An input shaft (7) and two planetary shafts (8) are installed between the lower shell (1) and the upper cover (4); the input shaft (7) is rotatably installed at the axial center positions of the lower convex shell (2) and the upper convex shell (3); the planetary shafts (8) are rotatably installed in the arc-shaped through groove (5) and the arc-shaped blind groove (6); the shaft body of the input shaft (7) is integrally connected to a first crankshaft (9); the shaft body of the planetary shaft (8) is integrally connected to a second crankshaft (10); and the second crankshaft (10) is located in the arc-shaped blind groove (6); A balance wheel group (11) is fixedly mounted on the shaft body of the planetary shaft (8), the balance wheel group (11) is located in the arc-shaped through groove (5), the balance wheel group (11) is meshed and matched with the first crankshaft (9), and the two second crankshafts (10) are meshed and matched with an output disk (12).

2. A compact reducer according to claim 1, characterized in that: The end of the lower convex shell (2) is provided with a step (13), and the upper convex shell (3) is provided with a buckling groove (14) for buckling with the step (13).

3. A compact reducer according to claim 2, characterized in that: The input shaft (7) and the planetary shaft (8) are both matched and installed with bearings.

4. A compact reducer according to claim 3, characterized in that: The input shaft (7) and the planetary shaft (8) are both provided with keyways (15).

5. A compact reducer according to claim 4, characterized in that: The first crankshaft (9) and the second crankshaft (10) are both provided with three eccentric wheel grooves, the corresponding balance wheel assembly (11) is provided with three balance wheels, and the corresponding output discs (12) are three.

6. A compact reducer according to claim 5, characterized in that: A spacer ring (16) is installed between two adjacent balance wheels in the balance wheel assembly (11).

7. A compact reducer according to claim 6, characterized in that: The two planetary shafts (8) are installed on both sides of the input shaft (7) at an angle of 180 degrees.

8. A compact reducer according to claim 7, characterized in that: The two planetary shafts (8) have the same specifications and models.

9. A compact reducer according to claim 8, characterized in that: The contact surfaces between the first crankshaft (9), the second crankshaft (10), the balance wheel assembly (11) and the output disc (12) are all polished and smooth.

10. A compact reducer according to claim 9, characterized in that: The lower convex shell (2) and the upper convex shell (3) are fixedly connected by screws.

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