A type of travel speed reducer

Abstract

This utility model relates to the field of speed reducer technology and discloses a traveling speed reducer, including a rear flange, an input shaft rotatably connected to the rear flange, a first-stage planetary reduction mechanism, a second-stage planetary reduction mechanism, a brake end cover, and a brake shaft rotatably connected to the brake end cover. The first-stage planetary reduction mechanism includes a first-stage sun gear, first-stage planet gears, a shaft disc, and a first-stage gear ring. The second-stage planetary reduction mechanism includes a second-stage sun gear, second-stage planet gears, a planet carrier, and a second-stage gear ring. A hub is fixedly connected to the outer side of the first-stage gear ring. This utility model is equipped with a brake shaft, which can be connected to an external brake for braking, thereby enabling the speed reducer to have a braking function. This can effectively reduce the impact during equipment start-up and shutdown, reduce component wear, extend equipment service life, and can also immediately stop the machinery in case of mechanical failure or motor malfunction, ensuring system safety and providing emergency stop capability, which can help achieve more precise motor control.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a walking speed reducer. Background Technology

[0002] The main function of AGVs in industrial applications is to realize unmanned and automated handling of logistics transfers, so as to reduce production costs, improve the economic efficiency of industry, and realize the automation of the entire process of loading, unloading and handling of goods and materials.

[0003] Traditional AGV reducers use concentric planetary reducers, where the motor, reducer, and wheel hub are all on the same axis. The wheel hub also requires a separate support structure, resulting in a relatively long axial dimension and a complex structure. In addition, AGVs use a dual-drive structure, so the width of the AGV must be at least greater than the width of two motors, two reducers, and two wheels, making it difficult to keep the width short.

[0004] With the continuous development of industry, AGVs are now required to be smaller in size while meeting the requirements of load-bearing capacity. The size of the reducer is also required to be shorter, and the system must be able to stop the machine immediately in case of mechanical failure or motor failure to ensure the safety of the system. Utility Model Content

[0005] The purpose of this invention is to provide a walking speed reducer that has a compact structure and can be braked by connecting an external brake to the brake shaft.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A travel reducer includes a rear flange, an input shaft rotatably connected to the rear flange, a first-stage planetary reduction mechanism, a second-stage planetary reduction mechanism, a brake end cover, and a brake shaft rotatably connected to the brake end cover. The first-stage planetary reduction mechanism includes a first-stage sun gear, first-stage planet gears, a shaft disc, and a first-stage ring gear. The second-stage planetary reduction mechanism includes a second-stage sun gear, second-stage planet gears, a planet carrier, and a second-stage ring gear. The second-stage sun gear is coaxially and fixedly connected to the input shaft. The second-stage ring gear is fixedly connected to the rear flange. The planet carrier is rotatably connected to the rear flange. The second-stage planet gears are rotatably connected to the planet carrier. The system is dynamically connected, with the secondary planetary gear meshing externally with the secondary sun gear and internally meshing with the secondary ring gear; the primary sun gear is fixedly connected to the planet carrier and coaxially arranged with the input shaft; the shaft disc is fixedly connected to the secondary ring gear, the rear flange, and the brake end cover; the primary ring gear is rotatably connected to the shaft disc; the primary planetary gears are rotatably connected to the shaft disc; the primary planetary gears are externally meshed with the primary sun gear and internally meshed with the primary ring gear; the brake shaft is coaxially fixedly connected to the primary sun gear; and a hub is fixedly connected to the outer side of the primary ring gear.

[0008] As a further feature of this invention, a first single-row deep groove ball bearing is provided between the input shaft and the rear flange.

[0009] As a further feature of this invention, a first limiting block is provided on the input shaft, a second limiting block is provided inside the housing, one side of the inner ring of the first single-row deep groove ball bearing abuts against the first limiting block, and one side of the outer ring of the first single-row deep groove ball bearing abuts against the second limiting block.

[0010] As a further feature of this invention, the input shaft is provided with a first mounting groove on the side of the first single-row deep groove ball bearing away from the first limiting block, and a first elastic retaining ring is provided in the first mounting groove, the first elastic retaining ring abutting against the first single-row deep groove ball bearing. The housing is provided with a second mounting groove on the side of the first single-row deep groove ball bearing away from the second limiting block, and a second elastic retaining ring is provided in the second mounting groove, the second elastic retaining ring abutting against the first single-row deep groove ball bearing.

[0011] As a further feature of this invention, a second single-row deep groove ball bearing is provided between the brake shaft and the brake end cover.

[0012] As a further feature of this invention, a third mounting groove is provided on the outer side of the brake shaft near the second single-row deep groove ball bearing, and a third elastic retaining ring is provided in the third mounting groove, the third elastic retaining ring abutting against the second single-row deep groove ball bearing.

[0013] As a further feature of this invention, a first pin is fixedly mounted on the shaft disk, the first pin being parallel to the axis of the input shaft, and the first-stage planetary gear being rotatably connected to the first pin.

[0014] As a further feature of this invention, a second pin is fixedly mounted on the planetary carrier, the second pin being parallel to the axis of the input shaft, and the secondary planetary gear is rotatably connected to the second pin.

[0015] As a further feature of this invention, the width of the secondary planetary gear is smaller than the width of the primary planetary gear, and the width of the secondary sun gear is smaller than the width of the primary sun gear.

[0016] The beneficial effects of this utility model are:

[0017] 1. The reducer of this utility model is equipped with a brake shaft, which can be connected to an external brake for braking, thereby enabling the reducer to have a braking function. This can effectively reduce the impact of the equipment during start-up and shutdown, reduce the wear of parts, extend the service life of the equipment, and can also stop the machinery immediately in case of mechanical failure or motor failure, ensuring the safety of the system. It has the ability to stop in an emergency and can help the motor achieve more precise control.

[0018] In addition, the brake shaft is connected to the first-stage planetary reduction mechanism. Compared with the direct connection to the input shaft, this method makes the speed of the brake shaft relatively lower than that of the input shaft, resulting in smoother braking. Furthermore, the brake shaft is connected separately to the first-stage sun gear, separating the input shaft and the brake shaft. For serialized reducers, this method allows for more shared parts and greater versatility.

[0019] 2. An external power unit is connected to the input shaft to drive the input shaft to rotate. The input shaft drives the secondary sun gear to rotate. The secondary sun gear drives the secondary planetary gear to rotate through external meshing. When the secondary planetary gear rotates along the secondary gear ring, it drives the planet carrier to rotate. The planet carrier then drives the primary sun gear to rotate. The primary sun gear drives the primary planetary gear to rotate through external meshing. Since the shaft disk is fixed, when the primary planetary gear rotates around its axis, it drives the primary gear ring to rotate. The primary gear ring has a hub connected to it. The hub is equivalent to the AGV wheel. The AGV wheel directly uses the internal support of the reducer, which simplifies the structure, strengthens the load-bearing capacity, and reduces the cost.

[0020] 3. The width of the second-stage planetary gear is smaller than that of the first-stage planetary gear, and the width of the second-stage sun gear is smaller than that of the first-stage sun gear. Under the condition that the strength of the gear train meets the working conditions, the width of the second-stage gear train is reduced, the axial dimension of the reducer is shortened, and the cost of raw materials is reduced. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0023] In the diagram, 1. Rear flange, 2. Input shaft, 3. Brake end cover, 4. Brake shaft, 5. First-stage sun gear, 6. First-stage planetary gear, 7. Shaft disc, 8. First-stage gear ring, 9. Second-stage sun gear, 10. Second-stage planetary gear, 11. Planet carrier, 12. Second-stage gear ring, 13. Hub, 14. First single-row deep groove ball bearing, 15. First elastic retaining ring, 16. Second elastic retaining ring, 17. Second single-row deep groove ball bearing, 18. Third elastic retaining ring, 19. First pin, 20. Second pin. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] A travel reducer includes a rear flange 1, an input shaft 2, a brake shaft 4, a brake end cover 3, a first-stage planetary reduction mechanism, and a second-stage planetary reduction mechanism; wherein the first-stage planetary reduction mechanism includes a first-stage sun gear 5, a first-stage planetary gear 6, a shaft disc 7, and a first-stage gear ring 8; the second-stage planetary reduction mechanism includes a second-stage sun gear 9, a second-stage planetary gear 10, a planet carrier 11, and a second-stage gear ring 12;

[0026] The rear flange 1 is fixedly connected to the external power unit, and the input shaft 2 is rotatably connected to the rear flange 1. During operation, the output end of the power unit is connected to the input shaft 2 to drive the input shaft 2 to rotate. The end of the input shaft 2 is provided with an inner hole, and the secondary sun gear 9 is press-fitted into the inner hole and fixedly connected to the input shaft 2 coaxially. The secondary gear ring 12, the rear flange 1, and the shaft disc 7 are fixed together by hexagon socket head cap screws. When the reducer is working, this whole part is fixed. The planetary carrier 11 is rotatably connected to the rear flange 1. A secondary pin is fixedly installed on the planetary carrier 11. The secondary pin is parallel to the axis of the input shaft 2. The secondary planetary gear 10 is rotatably connected to the secondary pin.

[0027] One end of the planetary carrier 11 is provided with an inner hole. One end of the first-stage sun gear 5 is pressed into the inner hole of the planetary carrier 11 and fixedly connected to the planetary carrier 11. The other end of the first-stage sun gear 5 is pressed into the inner hole of the brake shaft 4, so that the brake shaft 4 is fixedly connected to the first-stage sun gear 5. The planetary carrier 11, the first-stage sun gear 5, and the brake shaft 4 are arranged coaxially. The first-stage gear ring 8 is rotatably connected to the shaft disk 7. A first-stage pin is fixedly provided on the shaft disk 7. The first-stage pin is arranged parallel to the axis of the input shaft 2. The first-stage planetary gear 6 is rotatably connected to the first-stage pin.

[0028] The brake end cover 3 is fixedly connected to the shaft disc 7 by an internal hexagonal head screw, and the brake shaft 4 is rotatably connected to the brake end cover 3. During operation, the brake end cover 3 can be used to connect and fix with an external brake.

[0029] In the specific working process of the above structure, the output end of the power unit is connected to the input shaft 2, which drives the input shaft 2 to rotate. The input shaft 2 drives the secondary sun gear 9 to rotate, the secondary sun gear 9 drives the secondary planet gear 10 to rotate, and when the secondary planet gear 10 rotates along the secondary ring gear 12, it drives the planet carrier 11 to rotate. The planet carrier 11 then drives the primary sun gear 5 to rotate, and the primary sun gear 5 drives the primary planet gear 6 to rotate. Since the shaft disk 7 is fixed, when the primary planet gear 6 rotates around its axis, it drives the primary ring gear 8 to rotate, and the primary ring gear 8 outputs power.

[0030] The reducer in this embodiment is used for AVG vehicles. The wheel hub 13 of the AVG vehicle is fixedly connected to the first-stage gear ring 8. This allows the AGV vehicle wheels to directly utilize the internal support of the reducer, which simplifies the structure, enhances the load-bearing capacity, and reduces costs.

[0031] In addition, the width of the second-stage planetary gear 10 is smaller than the width of the first-stage planetary gear 6, and the width of the second-stage sun gear 9 is smaller than the width of the first-stage sun gear 5. Under the condition that the strength of the gear train meets the working conditions, the width of the second-stage gear train is reduced, the axial dimension of the reducer is shortened, and the cost of raw materials is reduced.

[0032] Furthermore, a first single-row deep groove ball bearing 14 is provided between the input shaft 2 and the rear flange 1; a first limiting block is provided on the input shaft 2, and a second limiting block is provided inside the housing. One side of the inner ring of the first single-row deep groove ball bearing 14 abuts against the first limiting block, and one side of the outer ring of the first single-row deep groove ball bearing 14 abuts against the second limiting block; a first mounting groove is provided on the side of the input shaft 2 away from the first limiting block, and a first elastic retaining ring 15 is provided in the first mounting groove, abutting against the first single-row deep groove ball bearing 14; a second mounting groove is provided on the side of the housing away from the second limiting block, and a second elastic retaining ring 16 is provided in the second mounting groove, abutting against the first single-row deep groove ball bearing 14. Through the above arrangement, the first single-row deep groove ball bearing 14 can be made more stable.

[0033] Furthermore, a second single-row deep groove ball bearing 17 is provided between the brake shaft 4 and the brake end cover 3; a third mounting groove is provided on the outer side of the brake shaft 4 near the second single-row deep groove ball bearing 17, and a third elastic retaining ring 18 is provided in the third mounting groove, which abuts against the second single-row deep groove ball bearing 17. Through the above arrangement, the second single-row deep groove ball bearing 17 can be made more stable.

[0034] Furthermore, a third single-row deep groove ball bearing is provided between the rear flange 1 and the planetary carrier 11, a fourth single-row deep groove ball bearing is provided between the planetary carrier 11 and the shaft disk 7, a fifth single-row deep groove ball bearing and a sixth deep groove ball bearing are provided between the shaft disk 7 and the first-stage gear ring 8, and needle roller bearings are provided between the first-stage planetary gear 6 and the first-stage pin shaft, and between the second-stage planetary gear 10 and the second-stage pin shaft. Through the above bearing arrangement, the rotational connection described in this embodiment is realized.

[0035] In other embodiments, the rotational connection between the various components can also be achieved by other bearing types or other rotational structures in the art, as long as the above-mentioned technical effects can be achieved.

[0036] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A travel reduction gear characterized by comprising: The system includes a rear flange (1), an input shaft (2) rotatably connected to the rear flange (1), a first-stage planetary reduction mechanism, a second-stage planetary reduction mechanism, a brake end cover (3), and a brake shaft (4) rotatably connected to the brake end cover (3). The first-stage planetary reduction mechanism includes a first-stage sun gear (5), a first-stage planetary gear (6), a shaft disc (7), and a first-stage gear ring (8). The second-stage planetary reduction mechanism includes a second-stage sun gear (9), a second-stage planetary gear (10), a planet carrier (11), and a second-stage gear ring (12). The second-stage sun gear (9) is coaxially and fixedly connected to the input shaft (2). The second-stage gear ring (12) is fixedly connected to the rear flange (1). The planet carrier (11) is rotatably connected to the rear flange (1). The second-stage planetary gear (10) is rotatably connected to the planet carrier (11). The secondary planetary gear (10) meshes externally with the secondary sun gear (9), and the secondary planetary gear (10) meshes internally with the secondary ring gear (12); the primary sun gear (5) is fixedly connected to the planet carrier (11), the primary sun gear (5) is coaxially arranged with the input shaft (2), the shaft disc (7) is fixedly connected to the secondary ring gear (12), the rear flange (1) and the brake end cover (3), the primary ring gear (8) is rotatably connected to the shaft disc (7), the primary planetary gear (6) is rotatably connected to the shaft disc (7), the primary planetary gear (6) meshes externally with the primary sun gear (5), the primary planetary gear (6) meshes internally with the primary ring gear (8), the brake shaft (4) is coaxially fixedly connected to the primary sun gear (5), and a hub (13) is fixedly connected to the outer side of the primary ring gear (8).

2. The walking reduction machine of claim 1, wherein, The width of the second-stage planetary gear (10) is less than the width of the first-stage planetary gear (6), and the width of the second-stage sun gear (9) is less than the width of the first-stage sun gear (5).

3. The travel reduction gear according to claim 1, characterized in that, A first single-row deep groove ball bearing (14) is provided between the input shaft (2) and the rear flange (1).

4. The travel reduction gear according to claim 3, characterized in that The input shaft (2) is provided with a first limiting block, and the rear flange (1) is provided with a second limiting block. The inner ring side of the first single-row deep groove ball bearing (14) abuts against the first limiting block, and the outer ring side of the first single-row deep groove ball bearing (14) abuts against the second limiting block.

5. The travel reduction gear according to claim 4, wherein The input shaft (2) is provided with a first mounting groove on the side of the first single-row deep groove ball bearing (14) away from the first limiting block. A first elastic retaining ring (15) is provided in the first mounting groove and abuts against the first single-row deep groove ball bearing (14). The rear flange (1) is provided with a second mounting groove on the side of the first single-row deep groove ball bearing (14) away from the second limiting block. A second elastic retaining ring (16) is provided in the second mounting groove and abuts against the first single-row deep groove ball bearing (14).

6. The travel reduction gear of claim 1, wherein A second single-row deep groove ball bearing (17) is provided between the brake shaft (4) and the brake end cover (3).

7. The travel reduction gear according to claim 6, wherein A third mounting groove is provided on the outer side of the brake shaft (4) near the second single-row deep groove ball bearing (17), and a third elastic retaining ring (18) is provided in the third mounting groove, which abuts against the second single-row deep groove ball bearing (17).

8. The travel reduction gear of claim 1, wherein A first pin (19) is fixedly installed on the shaft disk (7). The first pin (19) is parallel to the axis of the input shaft (2). The first-stage planetary gear (6) is rotatably connected to the first pin (19).

9. The travel reduction gear of claim 1, wherein A second pin (20) is fixedly installed on the planetary carrier (11). The second pin (20) is parallel to the axis of the input shaft (2). The secondary planetary gear (10) is rotatably connected to the second pin (20).

Images