Planetary gear reduction gearbox structure

Abstract

The utility model discloses a planetary gear reduction gearbox structure which comprises an inner gear ring, a speed regulating gear mechanism is arranged in the inner gear ring, and a flange is arranged at the rear end of the inner gear ring. The front end of the flange is provided with a front connector used for being connected with an inner gear ring, and the rear end of the flange is provided with a rear connector used for being connected with a motor. The front end of the inner gear ring is provided with the mounting seat, the rear end of the mounting seat is fixedly connected with the pull rod, the rear end of the pull rod penetrates through the inner gear ring and then is connected with the front connector through the nut, the connecting mode is simple, and the pull rod and the nut are low in cost as connecting structures. The mounting base is connected with an injection table of an injection molding machine through the connecting rod, and the rear connector is connected with a motor shell, so that the planetary gear reduction gearbox structure can be stably mounted on the injection molding machine.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machine equipment, in particular to a planetary gear reduction box structure. Background Art

[0002] In the prior art, the melt screw of the injection molding machine is generally driven by a hydraulic motor. With the development of the injection molding industry, more and more motors are used to drive the melt screw. As a power source, the motor has high production efficiency and low energy consumption. The motor can directly drive the melt screw with a smaller torque requirement, but for the melt screw with a larger torque requirement, the output shaft of the motor needs to be connected to the melt screw through a reduction gearbox to reduce the speed and amplify the torque.

[0003] For example, a Chinese patent with the announcement number CN219529771U discloses a helical planetary reducer, including a housing, a speed regulating gear mechanism installed in the housing, the housing including an inner gear ring that passes through from front to back, the front end cover of the inner gear ring is provided with a front end cover, the front end cover is sealed and connected to the inner gear ring, the rear end cover of the inner gear ring is provided with a rear end cover, the rear end cover is sealed and connected to the inner gear ring. Since the reducer connected to the melt screw is usually connected to the motor and the shooting platform at both ends respectively to ensure the stable operation of the reducer, and the above-mentioned helical planetary reducer is not provided with a structure connected to the motor and the shooting platform, it is difficult to be used to drive the melt screw. In view of this, the utility model improves the above-mentioned reducer and proposes a planetary gear reducer structure to solve the above-mentioned problem. Utility Model Content

[0004] The utility model overcomes the shortcomings of the above-mentioned technology and provides a planetary gear reduction box structure.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A planetary gear reduction box structure includes an inner gear ring, a speed regulating gear mechanism is arranged inside the inner gear ring, a flange is arranged at the rear end of the inner gear ring, the flange is provided with a front joint for connecting to the inner gear ring, and a rear joint for connecting to a motor, a mounting seat is arranged at the front end of the inner gear ring, a pull rod is connected to the rear end of the mounting seat, and the rear end of the pull rod passes through the inner gear ring and is connected to the front joint through a nut.

[0007] Preferably, a spring washer is provided between the mounting seat and the inner gear ring, and the spring washer is provided with a connecting hole for connecting with the pull rod.

[0008] Preferably, the mounting seat is connected to the inner gear ring and the front joint through at least two tie rods, and the inner gear ring is provided with through holes for connecting with the tie rods, and the through holes are evenly distributed circumferentially on the inner gear ring.

[0009] Preferably, the speed regulating gear mechanism includes a planetary carrier, on which is mounted a sun gear located in the center and at least two planetary gears meshing with the sun gear, the planetary carrier is provided with hollows for the planetary gears to pass through, and the planetary gears are all meshed with an inner gear ring; the sun gear is transmission connected to the output shaft of the motor, and the planetary carrier is transmission connected to the planetary gears.

[0010] Preferably, the planetary gear reduction box structure also includes a transmission shaft, a connecting groove is provided at the front end of the planetary frame, one end of the transmission shaft is spline-connected to the connecting groove, and the other end of the transmission shaft passes through a mounting seat.

[0011] Preferably, the planet carrier comprises a front end plate and a rear end plate, the front end plate and the rear end plate are connected via a planet shaft, the planet shaft is provided with a first bearing for connecting with a planetary gear, and the connecting groove is provided on the front end plate.

[0012] Preferably, the rear end plate is provided with a through hole for the sun gear to pass through, and a connecting piece is provided in the flange, and the connecting piece is used to connect the sun gear and the motor output shaft; the connecting piece is connected to the flange through a second bearing.

[0013] Preferably, the second bearing and the motor are provided with a sealing assembly, a first oil seal is provided between the mounting seat and the transmission shaft, an oil chamber is provided between the sealing assembly and the first oil seal, the mounting seat is provided with a first oil hole, the flange is provided with a second oil hole, and the first oil hole and the second oil hole are connected to the oil chamber.

[0014] Preferably, the sealing assembly includes a sealing cover and a second oil seal, the front end surface of the sealing cover is provided with a sealing groove, the second oil seal is placed in the sealing groove, the front end surface of the second oil seal is against the second bearing, the inner surface of the flange is provided with a step, and the sealing cover is fixedly connected to the step.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model is provided with a mounting seat and a rear joint, the mounting seat is used to connect with the injection molding machine's shooting platform, and the rear joint is used to connect with the motor housing, so that the planetary gear reducer structure can be stably installed on the injection molding machine. In addition, the utility model connects the mounting seat, the inner gear ring, and the flange together through a tie rod, the connection operation is simple, and the tie rod as a connection structure has low cost.

[0017] 2. The planet carrier is provided with a connection groove, which is spline-connected to the transmission shaft, and the connection method is simple. Since the spline connection has a higher load-bearing capacity than other mechanical connection methods, it is particularly suitable for connecting the connection groove with a large output torque and the transmission shaft.

[0018] 3. The cooling oil can enter and exit the oil cavity from the first oil hole and the second oil hole, and exchange heat with the planetary gear reducer structure, thereby helping the planetary gear reducer structure to dissipate heat efficiently and helping to extend the service life of the planetary gear reducer structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the connection between the utility model and the shooting platform;

[0020] Figure 2 It is a schematic diagram of the connection between the utility model and the motor;

[0021] Figure 3 yes Figure 2 A cross-sectional view at AA;

[0022] Figure 4 It is an exploded schematic diagram of the planetary gear reduction box structure of the utility model;

[0023] Figure 5 It is a schematic diagram of the speed regulating gear mechanism of the utility model;

[0024] Figure 6 It is a schematic diagram of the meshing of the planetary gear and the internal gear ring of the utility model;

[0025] The implementation, functional features and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0027] Reference Figure 1-6 , an embodiment of a planetary gear reduction box structure of the utility model is proposed:

[0028] A planetary gear reduction box structure includes an inner gear ring 2, a speed regulating gear mechanism 3 is arranged inside the inner gear ring 2, and a flange 4 is arranged at the rear end of the inner gear ring 2. A front joint 41 for connecting with the inner gear ring 2 is arranged at the front end of the flange 4, and a rear joint 42 for connecting with a motor 5 is arranged at the rear end of the flange 4. A mounting seat 1 is arranged at the front end of the inner gear ring 2, and a pull rod 11 is fixedly connected to the rear end of the mounting seat 1. The rear end of the pull rod 11 penetrates the inner gear ring 2 and is connected to the front joint 41 through a nut 12. The connection method is simple, and the pull rod 11 and the nut 12 are low in cost as a connection structure.

[0029] like Figure 1 As shown, when the utility model is used for transmission connection between the melt screw and the motor 5, the mounting base 1 is connected to the shooting platform 6 of the injection molding machine through the connecting rod 13, and the rear joint 42 is connected to the housing of the motor 5, so that the planetary gear reduction box structure can be stably installed on the injection molding machine.

[0030] like Figure 4 As shown, a spring washer 14 is provided between the mounting seat 1 and the inner gear ring 2, and the spring washer 14 is provided with a connection hole 141 for connecting with the pull rod 11. The spring washer 14 can prevent the connection between the pull rod 11 and the inner gear ring 2 from loosening, thereby strengthening the connection between the pull rod 11 and the inner gear ring 2.

[0031] In the embodiment of the utility model, the mounting seat 1 is connected to the inner gear ring 2 and the front joint 41 through twelve tie rods 11, and the connection is stable. The inner gear ring 2 is provided with through holes for connecting with the tie rods 11, and the through holes are evenly distributed circumferentially on the inner gear ring 2. In other embodiments, the number of tie rods 11 is not less than two.

[0032] like Figure 5-6 As shown, the speed regulating gear mechanism 3 includes a planet carrier 31, the planet carrier 31 is equipped with a sun gear 32 located in the center, three planet gears 33 meshing with the sun gear 32, and the planet carrier 31 is provided with a hollow for the planet gears 33 to pass through, and the planet gears 33 pass through the hollow to mesh with the teeth of the inner gear ring 2. The sun gear 32 is transmission-connected to the motor output shaft 51, and the planet carrier 31 is transmission-connected to the planet gears 33. The planetary gear reduction box structure also includes a transmission shaft 7, a connection groove 311 is provided at the front end of the planet carrier 31, one end of the transmission shaft 7 is spline-connected to the connection groove 311, and the other end of the transmission shaft 7 passes through the mounting seat 1. Specifically, an internal spline is provided in the connection groove 311, and an external spline is provided on the outer surface of the transmission shaft 7.

[0033] When the motor output shaft 51 drives the sun gear 32 to rotate, the sun gear 32 then drives the planetary gear 33. Since the inner gear ring 2 is fixedly connected to the mounting seat 1 and the flange 4, the planetary gear 33 will rotate around the circumference of the sun gear 32. The planet carrier 31 is connected to the planetary gear 33 by transmission, and the transmission shaft 7 is spline-connected to the connecting groove 311, which finally causes the transmission shaft 7 to rotate. The motor output shaft 51 is connected to the transmission shaft 7 through the speed regulating gear mechanism 3. Compared with the motor output shaft 51, the speed of the transmission shaft 7 is reduced and the torque is increased. The spline connection has a higher load-bearing capacity than other mechanical connection methods, and is particularly suitable for connecting the connecting groove 311 with a large output torque to the transmission shaft 7.

[0034] The planet carrier 31 includes a front end plate 312 and a rear end plate 313. The front end plate 312 and the rear end plate 313 are connected through a planet shaft 314. The planet shaft 314 is provided with a first bearing 34 for connecting with the planet gear 33. The connecting groove 311 is provided on the front end plate 312. The rear end plate 313 is provided with a through hole for the sun gear 32 to pass through. A connecting piece 43 is provided in the flange 4. The front end of the connecting piece 43 is provided with a tooth groove for meshing with the sun gear 32. The rear end of the connecting piece 43 is provided with a transmission groove, and the transmission groove is spline-connected with the motor output shaft. The connecting piece 43 is connected to the flange 4 through a second bearing 44.

[0035] like Figure 3 As shown, the second bearing 44 and the motor 5 are provided with a sealing assembly, and the sealing assembly includes a sealing cover 45 and a second oil seal 46. The front end surface of the sealing cover 45 is provided with a sealing groove, and the second oil seal 46 is placed in the sealing groove. The front end surface of the second oil seal 46 abuts against the second bearing 44. The inner surface of the flange 4 is provided with a step 47, and the sealing cover 45 is fixedly connected to the step 47. A first oil seal 16 is provided between the mounting seat 1 and the transmission shaft 7, and an oil cavity is provided between the sealing assembly and the first oil seal 16. The mounting seat 1 is provided with a first oil hole 15, and the flange 4 is provided with a second oil hole 48. The first oil hole 15 and the second oil hole 48 are connected to the oil cavity. The cooling oil can enter and exit the oil cavity from the first oil hole 15 and the second oil hole 48, and heat exchange with the planetary gear reducer structure, thereby helping the planetary gear reducer structure to dissipate heat efficiently, which helps to extend the service life of the planetary gear reducer structure. When the utility model is used for transmission connection of the melt screw and the motor 5, the cooling oil can be transported to the oil cavity through the oil circuit system of the injection molding machine, and there is no need to set up an oil pump for transporting cooling oil to the oil cavity, thereby reducing equipment costs.

[0036] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A planetary gear reducer structure, characterized in that: The invention comprises an inner gear ring (2), wherein a speed regulating gear mechanism (3) is arranged inside the inner gear ring (2), a flange (4) is arranged at the rear end of the inner gear ring (2), the flange (4) is provided with a front joint (41) for connecting with the inner gear ring (2), and a rear joint (42) for connecting with a motor (5), a mounting seat (1) is arranged at the front end of the inner gear ring (2), a pull rod (11) is connected to the rear end of the mounting seat (1), and the rear end of the pull rod (11) passes through the inner gear ring (2) and is connected to the front joint (41) via a nut (12).

2. A planetary gear reduction box structure according to claim 1, characterized in that: A spring washer (14) is provided between the mounting seat (1) and the inner gear ring (2), and the spring washer (14) is provided with a connecting hole (141) for connecting with the pull rod (11).

3. A planetary gear reduction box structure according to claim 1 or 2, characterized in that: The mounting seat (1) is connected to the inner gear ring (2) and the front joint (41) via at least two tie rods (11); the inner gear ring (2) is provided with through holes for connecting to the tie rods (11); the through holes are evenly distributed circumferentially on the inner gear ring (2).

4. A planetary gear reduction box structure according to claim 1, characterized in that: The speed regulating gear mechanism (3) comprises a planet carrier (31), the planet carrier (31) being provided with a sun gear (32) located at the center and at least two planet gears (33) meshing with the sun gear (32), the planet carrier (31) being provided with a hollow for the planet gears (33) to pass through, and the planet gears (33) being meshed with the inner gear ring (2); the sun gear (32) being transmission-connected to the motor output shaft (51), and the planet carrier (31) being transmission-connected to the planet gears (33).

5. A planetary gear reduction box structure according to claim 4, characterized in that: It also comprises a transmission shaft (7), a connecting groove (311) being provided at the front end of the planet carrier (31), one end of the transmission shaft (7) being spline-connected to the connecting groove (311), and the other end of the transmission shaft (7) passing through the mounting seat (1).

6. A planetary gear reduction box structure according to claim 5, characterized in that: The planet carrier (31) comprises a front end plate (312) and a rear end plate (313); the front end plate (312) and the rear end plate (313) are connected via a planet shaft (314); the planet shaft (314) is provided with a first bearing (34) for connecting to the planet gear (33); and the connecting groove (311) is provided on the front end plate (312).

7. A planetary gear reduction box structure according to claim 6, characterized in that: The rear end plate (313) is provided with a through hole for the sun gear (32) to pass through, and a connecting piece (43) is provided inside the flange (4), and the connecting piece (43) is used to connect the sun gear (32) and the motor output shaft (51); the connecting piece (43) is connected to the flange (4) via a second bearing (44).

8. A planetary gear reduction box structure according to claim 7, characterized in that: The second bearing (44) and the motor (5) are provided with a sealing assembly, a first oil seal (16) is provided between the mounting seat (1) and the transmission shaft (7), an oil chamber is provided between the sealing assembly and the first oil seal (16), the mounting seat (1) is provided with a first oil hole (15), the flange (4) is provided with a second oil hole (48), and the first oil hole (15) and the second oil hole (48) are connected to the oil chamber.

9. A planetary gear reduction box structure according to claim 8, characterized in that: The sealing assembly comprises a sealing cover (45) and a second oil seal (46); a sealing groove is provided on the front end surface of the sealing cover (45); the second oil seal (46) is placed in the sealing groove; the front end surface of the second oil seal (46) abuts against the second bearing (44); a step (47) is provided on the inner surface of the flange (4); and the sealing cover (45) is fixedly connected to the step (47).

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