A reduction gear box

Abstract

The utility model belongs to motor field, concretely relates to a reduction gear box, including box and gear assembly, the accommodating cavity that has accommodation gear assembly in the box, the accommodating cavity has first step department, the output port of box is provided with second step department, gear assembly includes pivot, first gear, second gear, third gear and fourth gear, first gear sets up on pivot, the third gear of pivot is provided with on the first gear above position, second gear rotation sets up on first step department, second gear is engaged with first gear, third gear, fourth gear rotation sets up on second step department, fourth gear is engaged with third gear, gear assembly adopts the stepped structure design, four stage gear is along pivot distribution in the form of ladder, makes full use of axial space, small, second gear, third gear respectively first step department, second step department, can avoid the bottom wall of box to bear the greater torsion, prevents the deformation of box.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a reduction gearbox used in motors. Background Technology

[0002] A reduction gearbox for an electric motor, often simply referred to as a "speed reducer" or "speed reducer," is a precision transmission device connecting the output shaft of the electric motor (motor) and its working mechanism. It is used to reduce the high-speed rotation of the motor and increase its torque through gear transmission.

[0003] Existing gearboxes for motors employ a cylindrical structure design. The bottom of this gearbox needs to withstand significant torque, making it prone to deformation. This necessitates thickening the bottom wall to prevent deformation, thus increasing the production cost of the geared motor. Furthermore, the gearbox's large size increases its installation space requirements within the equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a reduction gearbox that is small in size, stable in performance, and low in production cost.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A reduction gearbox includes a housing and a gear assembly. The housing has a receiving cavity for accommodating the gear assembly. The receiving cavity has a first step. The output port of the housing has a second step. The gear assembly includes a rotating shaft, a first gear, a second gear, a third gear, and a fourth gear. The first gear is mounted on the rotating shaft for meshing with the output gear of a motor. The third gear is mounted on the rotating shaft above the first gear. The second gear is rotatably mounted on the first step and meshes with the first and third gears. The fourth gear is rotatably mounted on the second step and meshes with the third gear.

[0006] In some embodiments, the housing includes a base and a cover detachably connected to the base, with the accommodating cavity formed between the cover and the base. An annular boss is provided on the bottom wall of the base. The rotating shaft is installed between the annular step and the cover. The first step is provided in the base, and a positioning annular boss is provided on the first step. The gear shaft of the second gear is installed between the positioning annular boss and the cover.

[0007] In some embodiments, the cover is provided with a slot corresponding to the second step portion to expose the teeth of the fourth gear, and the second step portion is provided with a supporting annular boss, and the two ends of the shaft of the fourth gear are respectively connected to the supporting annular boss and the positioning groove of the cover.

[0008] In some embodiments, the lower end of the base is a ring-shaped cover that covers the motor. The output shaft of the motor passes through the bottom wall of the base and extends into the receiving cavity. The output gear is mounted on the output shaft.

[0009] In some embodiments, the cover has a baffle on one side, and the lower end of the baffle is provided with a wiring groove through which the motor wires can pass.

[0010] In some embodiments, the housing is provided with a plurality of positioning posts, which are respectively engaged with the motor, forming a locking engagement between the plurality of positioning posts and the motor.

[0011] In some embodiments, the seat body has a protruding ring portion on the side facing the cover body, the cover body has an annular groove that engages with the protruding ring portion, and the cover body has a plurality of screws that connect to the outer side of the protruding ring portion.

[0012] In some embodiments, a sealing ring is provided on the outer side of the convex ring portion to abut against the cover body, thereby forming a sealing fit between the convex ring portion, the cover body, and the sealing ring.

[0013] In some embodiments, a retaining plate is provided on the top of the cover, the retaining plate is in the shape of an "I", and a U-shaped mounting groove is provided in the middle of the retaining plate.

[0014] In some embodiments, the cover has a heat dissipation step portion above the first step portion corresponding to the seat.

[0015] The beneficial effects of this utility model are as follows: The gear assembly of this reduction gearbox adopts a stepped structure design, with four gears distributed in a stepped manner along the shaft, making full use of axial space and achieving multi-stage reduction within a limited volume, thus achieving maximum power density. Furthermore, the second and third gears are located on the first and second steps respectively, thereby avoiding excessive torque on the bottom wall of the gearbox, preventing deformation of the gearbox, and extending its service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present utility model; Figure 3 This is a cross-sectional view of an embodiment of the present utility model; Figure 4 This is a perspective view of the base body in an embodiment of the present utility model. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-4 As shown, a reduction gearbox includes a housing 1 and a gear assembly 2. The housing 1 has a receiving cavity 100 for accommodating the gear assembly 2. The receiving cavity 100 has a first step portion 101. A second step portion 103 is provided at the output port 102 of the housing 1. The gear assembly 2 includes a rotating shaft 21, a first gear 22, a second gear 23, a third gear 24, and a fourth gear 25. The first gear 22 is disposed on the rotating shaft 21 for meshing with the output gear 31 of the motor 3. The third gear 24 is disposed on the rotating shaft 21 above the first gear 22. The second gear 23 is rotatably disposed on the first step portion 101 and meshes with the first gear 22 and the third gear 24. The fourth gear 25 is rotatably disposed on the second step portion 103 and meshes with the third gear 24.

[0022] like Figure 1-3As shown, the housing 1 includes a base 11 and a cover 12 detachably connected to the base 11. A receiving cavity 100 is formed between the cover 12 and the base 11. An annular boss 111 is provided on the bottom wall of the base 11. A rotating shaft 21 is installed between the annular step 111 and the cover 12. A first step 101 is provided inside the base 11, and a positioning annular boss 1011 is provided on the first step 101. The gear shaft 231 of the second gear 23 is installed between the positioning annular boss 1011 and the cover 12. The base and the cover adopt a detachable connection structure design, which facilitates the assembly of the gear assembly and the housing, and improves assembly efficiency. A slot 121 is provided on the cover 12 at the position corresponding to the second step 103 to expose the teeth of the fourth gear 25. A supporting annular boss 1031 is provided on the second step 103. The two ends of the shaft 251 of the fourth gear 25 are respectively connected to the supporting annular boss 1031 and the positioning slot 122 of the cover 12. The supporting annular boss strengthens the second step and facilitates the assembly of the fourth gear with the second step. The lower end of the base 11 has a ring-shaped cover 112 that covers the motor 3. The output shaft 30 of the motor 3 passes through the bottom wall of the base 11 and extends into the receiving cavity 100. The output gear 31 is mounted on the output shaft 30. The cover provides protection and facilitates the assembly of the base and the motor, resulting in higher assembly efficiency. One side of the cover 112 has a baffle 113, and the lower end of the baffle 113 has a wiring groove 114 through which the motor 3's wires can pass. The wiring groove on the baffle facilitates neater wiring of the motor's wires.

[0023] Multiple positioning posts 115 are provided inside the cover 112, and these posts 115 are respectively engaged with the motor 3, forming a snap-fit ​​engagement between the positioning posts 115 and the motor 3. The engagement of the cover with the motor via these positioning posts facilitates the assembly of the base and the motor, making assembly more convenient. A protruding ring portion 116 is provided on the side of the base 11 facing the cover 12. An annular groove 123 is provided inside the cover 12, engaging with the protruding ring portion 116. Multiple screws 13 are provided on the cover 12, connecting to the outer side of the protruding ring portion 116. The base and cover are assembled using a snap-fit ​​engagement, which improves the assembly efficiency of the reduction gearbox. A sealing ring 14 is provided on the outer side of the protruding ring portion 116, abutting against the cover 12, forming a sealing engagement between the protruding ring portion 116, the cover 12, and the sealing ring 14. The sealing ring is located on the outer side of the protruding ring portion, which improves the sealing performance between the base and the cover. A retaining plate 124 is provided on the top of the cover 12. The retaining plate 124 is I-shaped, and a U-shaped mounting groove 125 is provided in the middle of the retaining plate 124. The retaining plate on the cover facilitates the installation of the reduction gearbox and improves the installation efficiency of the reduction gearbox. A heat dissipation step portion 126 is provided on the cover 12 above the first step portion 101 of the base 11. The heat dissipation step portion on the cover can effectively increase the heat dissipation area of ​​the cover, thereby facilitating the heat dissipation of the reduction gearbox.

[0024] The gear assembly of this reduction gearbox adopts a stepped structure design, with four gears distributed in a stepped pattern along the shaft. This fully utilizes axial space, achieving multi-stage reduction within a limited volume and maximizing power density. Furthermore, the second and third gears are located on the first and second steps, respectively, thus avoiding excessive torque on the bottom wall of the gearbox, preventing deformation, and extending the service life of the reduction gearbox.

[0025] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A reduction gearbox, comprising a housing and a gear assembly, characterized in that: The housing has a cavity for accommodating a gear assembly. The cavity has a first step. The output port of the housing has a second step. The gear assembly includes a shaft, a first gear, a second gear, a third gear, and a fourth gear. The first gear is mounted on the shaft for meshing with the output gear of the motor. The third gear is mounted on the shaft above the first gear. The second gear is rotatably mounted on the first step and meshes with the first and third gears. The fourth gear is rotatably mounted on the second step and meshes with the third gear.

2. The reduction gearbox according to claim 1, characterized in that: The housing includes a base and a cover detachably connected to the base. A receiving cavity is formed between the cover and the base. An annular boss is provided on the bottom wall of the base. The rotating shaft is installed between the annular step and the cover. The first step is located in the base. A positioning annular boss is provided on the first step. The gear shaft of the second gear is installed between the positioning annular boss and the cover.

3. The reduction gearbox according to claim 2, characterized in that: The cover has a slot at the second step to expose the teeth of the fourth gear. The second step has a supporting annular boss. The two ends of the shaft of the fourth gear are respectively connected to the supporting annular boss and the positioning groove of the cover.

4. The reduction gearbox according to claim 2, characterized in that: The lower end of the base is a ring-shaped cover that covers the motor. The output shaft of the motor passes through the bottom wall of the base and extends into the receiving cavity. The output gear is mounted on the output shaft.

5. The reduction gearbox according to claim 4, characterized in that: The cover has a baffle on one side, and the lower end of the baffle is provided with a wiring groove through which the motor wires can pass.

6. The reduction gearbox according to claim 4, characterized in that: The housing contains multiple positioning posts, which are respectively engaged with the motor, forming a locking mechanism between the positioning posts and the motor.

7. The reduction gearbox according to claim 2, characterized in that: The seat body has a protruding ring on the side facing the cover body, the cover body has an annular groove that engages with the protruding ring, and the cover body has multiple screws that connect to the outside of the protruding ring.

8. The reduction gearbox according to claim 7, characterized in that: A sealing ring is provided on the outer side of the convex ring portion to abut against the cover body, thus forming a sealing fit between the convex ring portion, the cover body and the sealing ring.

9. The reduction gearbox according to claim 2, characterized in that: The top of the cover is provided with a card plate, which is in the shape of an "I" and has a U-shaped mounting groove in the middle.

10. The reduction gearbox according to claim 9, characterized in that: The cover has a heat dissipation step above the first step of the base.

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