Speed reduction motor

Abstract

The utility model provides a gear motor, and belongs to the technical field of motors. The problem that an existing motor is poor in sealing performance is solved. The speed reduction motor comprises a machine barrel, a sealing cover and a front end cover fixed between the sealing cover and the machine barrel, a mounting cavity is formed between the sealing cover and the front end cover, an output shaft is rotationally arranged in the mounting cavity, a rotor shaft is arranged in the machine barrel, the front end of the rotor shaft extends into the mounting cavity and is connected with the rear end of the output shaft through a gear structure, and the front end of the output shaft penetrates through the sealing cover. The inner wall of the sealing cover and the output shaft are sealed through an oil seal, an annular limiting seat is formed at the front end of the output shaft, an annular sealing seat is formed on the front side of the sealing cover, the output shaft is sleeved with the sealing seat, the limiting seat is arranged on the front side of the sealing seat and does not make contact with the sealing seat, an annular groove is formed in the front end face of the sealing seat, and a rubber ring is arranged in the annular groove. The front side of the rubber ring extends out of the annular groove and presses the rear end face of the limiting base, and the rear side of the rubber ring presses the bottom face of the annular groove. The speed reducing motor is good in sealing performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and relates to a motor, in particular to a reduction motor. Background Art

[0002] A reduction motor, also known as a "speed reduction motor" or a "speed reduction motor", is a device that converts the high-speed and low-torque output of an electric motor into a low-speed and high-torque output.

[0003] An existing reduction motor, such as a motor disclosed in the Chinese Patent Database (application number: 201920350657.9), includes a casing and a rotating shaft disposed inside the casing. An end cover is fixedly connected to the outside of the casing in a sealed manner, and an installation cavity is formed between the end cover and the casing. An output shaft is rotatably disposed in the installation cavity. The outer end of the rotating shaft extends into the installation cavity and drives the output shaft to rotate through a transmission mechanism. The outer end of the output shaft extends out of the installation cavity. It is characterized in that a tubular connecting portion is integrally formed on the end cover. The connecting portion is located outside the installation cavity and sleeved on the output shaft. A sealing cylinder is sleeved outside the connecting portion. One end of the sealing cylinder is fixedly connected to the end cover. The other end of the sealing cylinder has an annular shoulder. The annular shoulder and the sealing cylinder are coaxially arranged, and the connecting portion is located between the annular shoulder and the installation cavity. A sealing ring made of cotton material is provided between the annular shoulder and the connecting portion. The sealing ring is sleeved on the output shaft. The two end faces of the sealing ring are respectively tightly pressed against the end face of the annular shoulder and the end face of the connecting portion to form a seal, and the inner side wall of the sealing ring is closely abutted against the side wall of the output shaft to form a seal.

[0004] In the above-mentioned motor, only the horizontally arranged sealing ring contacts between the output shaft and the end cover. This method is likely to cause wear of the sealing ring and affect the sealing performance. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a reduction motor with good sealing performance in view of the above problems existing in the prior art.

[0006] The purpose of the present utility model can be achieved by the following technical solutions: A reduction motor, comprising a barrel, a sealing cover, and a front end cover fixed between the sealing cover and the barrel. An installation cavity is formed between the sealing cover and the front end cover. An output shaft is rotatably arranged in the installation cavity. A rotor shaft is arranged in the barrel. The front end of the rotor shaft extends into the installation cavity and is connected to the rear end of the output shaft through a gear structure. The front end of the output shaft passes through the sealing cover. A seal is formed between the inner wall of the sealing cover and the output shaft through an oil seal. It is characterized in that a ring-shaped limit seat is formed at the front end of the output shaft, a ring-shaped sealing seat is formed on the front side of the sealing cover. The sealing seat is sleeved outside the output shaft, and the sealing seat, the limit seat, and the output shaft are coaxially arranged; the limit seat is arranged on the front side of the sealing seat and the two do not contact. An annular groove is formed on the front end face of the sealing seat. A rubber ring with a shape and size matching that of the annular groove is arranged in the annular groove. The front side of the rubber ring extends out of the annular groove and presses against the rear end face of the limit seat, and the rear side of the rubber ring presses against the bottom face of the annular groove.

[0007] With the cooperation of the rubber ring and the oil seal, not only two seals are formed in the axial direction of the output shaft, increasing the difficulty for external impurities to enter the installation cavity, but also the rubber ring arranged on the front side plays a good protective role for the oil seal to enhance the service life of the oil seal. Thus, the duration of the sealing effect formed between the output shaft and the front end cover is greatly extended, enhancing the sealing performance and service life of the motor.

[0008] In the above reduction motor, a sprocket is sleeved on the front end of the output shaft, and the sprocket and the output shaft are circumferentially matched through a flat key or a spline. An annular pressing part is also sleeved and fixed on the output shaft. The front and rear end faces of the sprocket are respectively pressed tightly against the annular pressing part and the limit seat. The limit seat is used for both the seal between the output shaft and the sealing cover and the axial limit of the sprocket. That is, in this application, the limit seat has a dual-purpose effect, simplifying the structure and facilitating assembly at the same time.

[0009] In the above reduction motor, the annular pressing part is a pressing cap screwed on the output shaft to facilitate the disassembly and assembly of the sprocket and is conducive to subsequent maintenance.

[0010] As another solution, in the above reduction motor, the annular pressing part is a pressing ring, and the pressing ring is fixedly connected to the output shaft by welding.

[0011] In the above reduction motor, the axial cross-section of the rubber ring is circular. On the premise of ensuring a stable seal, the contact area between the rubber ring and the limit seat and the sealing seat can be reduced, the pre-tightening force on the rubber ring can be reduced, and the service life of the rubber ring can be extended.

[0012] In the above reduction motor, the bottom wall of the limit seat extends downward to form a retaining ring. The retaining ring is sleeved outside the upper end of the sealing seat, and the inner diameter of the retaining ring is larger than the outer diameter of the sealing seat. The retaining ring is sleeved outside the sealing seat to form a shield, which not only protects the rubber ring, but also can further extend the sealing path formed between the output shaft and the sealing cover, improving the sealing effect.

[0013] In the above reduction motor, the sealing cover is a casting integral part.

[0014] In the above reduction motor, the output shaft is rotationally fitted with the sealing cover through a front bearing, and the output shaft is also rotationally fitted with the front end cover through a rear bearing, and both the front bearing and the rear bearing are arranged in the installation cavity.

[0015] In the above reduction motor, a first annular step and a second annular step are formed on the inner wall of the sealing cover, and the first annular step and the second annular step are continuously distributed front and rear. The front bearing and the oil seal are respectively arranged in the first annular step and the second annular step, and both sides of the oil seal are respectively pressed against the bottom surface of the first annular step and the outer ring of the front bearing. The front bearing is used for both the axial limit of the oil seal and the rotational fit between the output shaft and the sealing cover, and has the advantages of simple structure and convenient assembly.

[0016] Compared with the prior art, the reduction motor has the following advantages:

[0017] 1. With the cooperation of the rubber ring and the oil seal, not only two seals are formed axially on the output shaft, increasing the difficulty of external impurities entering the installation cavity, but also the rubber ring arranged on the front side plays a good protective role for the oil seal to enhance the service life of the oil seal, thereby greatly prolonging the duration of the sealing effect formed between the output shaft and the front end cover, and enhancing the sealing performance and service life of the motor.

[0018] 2. The retaining ring is sleeved outside the sealing seat to form a shield, which not only protects the rubber ring, but also can further extend the sealing path formed between the output shaft and the sealing cover, improving the sealing effect. Description of the Drawings

[0019] Figure 1 is a three-dimensional schematic diagram of the reduction motor.

[0020] Figure 2 is a sectional schematic diagram of the reduction motor.

[0021] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0022] Figure 4 is a schematic diagram of the structure of the reduction motor after removing the sealing cover.

[0023] In the figure, 1. barrel; 2. sealing cover; 2a. sealing seat; 2b. first annular step; 3. front end cover; 4. rotor shaft; 5. output shaft; 5a. limit seat; 5b. retaining ring; 6. front bearing; 7. large gear; 8. oil seal; 9. rubber ring; 10. sprocket; 11. annular pressing piece. Detailed Embodiment

[0024] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments. Embodiment 1

[0025] As Figure 1 and Figure 2 shown, this speed reduction motor includes a barrel 1, a sealing cover 2, and a front end cover 3 fixed between the sealing cover 2 and the barrel 1, and an installation cavity is formed between the sealing cover 2 and the front end cover 3. In the actual product, the front and rear sides of the front end cover 3 are respectively pressed on the sealing cover 2 and the barrel 1, and both sides of the front end cover 3 are fixedly connected to the sealing cover 2 and the barrel 1 through a circle of screws respectively.

[0026] Specifically,

[0027] a rotor shaft 4 is provided in the barrel 1, and the axis of the rotor shaft 4 extends forward and backward. The installation method of the rotor shaft 4 is existing and will not be elaborated here. An output shaft 5 is rotatably provided in the installation cavity, and the axis of the output shaft 5 extends forward and backward. That is, at this time, the axes of the output shaft 5 and the rotor shaft 4 are arranged in parallel. In the actual product, the output shaft 5 is rotatably matched with the sealing cover 2 through a front bearing 6, and the output shaft 5 is also rotatably matched with the front end cover 3 through a rear bearing, and both the front bearing 6 and the rear bearing are arranged in the installation cavity to effectively ensure the smooth rotation of the output shaft 5.

[0028] As Figure 2 and Figure 4 shown, the front end of the rotor shaft 4 extends into the installation cavity and is connected to the rear end of the output shaft 5 through a gear structure. Specifically, a small gear is formed at the front end of the rotor shaft 4, a large gear 7 is fixed on the output shaft 5, and the large gear 7 and the small gear are engaged together.

[0029] A through hole for the front end of the output shaft 5 to extend out is axially penetrated through the sealing cover 2, and a seal is formed between the inner wall of the through hole and the output shaft 5 through an oil seal 8. As Figure 2 and Figure 3 shown, a ring-shaped limit seat 5a is formed at the front end of the output shaft 5, a ring-shaped seal seat 2a is formed on the front side of the sealing cover 2, the seal seat 2a is sleeved outside the output shaft 5, and the seal seat 2a, the limit seat 5a, and the output shaft 5 are coaxially arranged. The limit seat 5a is arranged in front of the seal seat 2a and the two do not contact. An annular groove is formed on the front end face of the seal seat 2a, and a rubber ring 9 with a shape and size matching that of the annular groove is provided in the annular groove. The front side of the rubber ring 9 extends out of the annular groove and presses on the rear end face of the limit seat 5a, and the rear side of the rubber ring 9 presses on the bottom face of the annular groove.

[0030] With the cooperation of the rubber ring 9 and the oil seal 8, not only two seals are formed in the axial direction of the output shaft 5, which increases the difficulty of external impurities entering the installation cavity, but also the rubber ring 9 arranged on the front side plays a better protective role on the oil seal 8, thereby enhancing the service life of the oil seal 8, thereby greatly extending the duration of the sealing effect formed between the output shaft 5 and the front end cover 3, and enhancing the sealing performance and service life of the motor.

[0031] Further, the bottom wall of the stopper seat 5a extends downward to form a retaining ring 5b, which fits over the upper end of the sealing seat 2a. The inner diameter of the retaining ring 5b is larger than the outer diameter of the sealing seat 2a. The retaining ring 5b fits over the sealing seat 2a to provide a shield, protecting the rubber ring 9 while further extending the sealing path between the output shaft 5 and the sealing cover 2, thereby improving the sealing effect.

[0032] In this embodiment,

[0033] The axial cross-section of the rubber ring 9 is preferably circular, which can reduce the contact area between the rubber ring 9 and the limiting seat 5a and the sealing seat 2a while ensuring a stable seal, thereby reducing the preload force on the rubber ring 9 and extending the life of the rubber ring 9.

[0034] like Figure 2 As shown, the inner wall of the through hole is formed with an annular step 1 (2b) and an annular step 2 (2), which are arranged continuously in the front and rear directions. The front bearing 6 and oil seal 8 are respectively disposed within annular step 1 (2b) and annular step 2 (2), with the front and rear sides of the oil seal 8 respectively pressing against the bottom surface of annular step 1 (2b) and the outer ring of the front bearing 6. The front bearing 6 also serves to axially limit the oil seal 8 and to provide rotational engagement between the output shaft 5 and the sealing cover 2, resulting in a simple structure and easy assembly.

[0035] like Figures 1 to 3 As shown, in use, the front end of the output shaft 5 is sleeved with a sprocket 10, and the sprocket 10 and the output shaft 5 are circumferentially mated via a flat key or spline. An annular pressure piece 11 is also sleeved and fixed on the output shaft 5, and the front and rear end surfaces of the sprocket 10 are respectively pressed against the annular pressure piece 11 and the limit seat 5a. The limit seat 5a is used for both sealing between the output shaft 5 and the sealing cover 2 and for axially limiting the sprocket 10. That is, in this application, the limit seat 5a has a dual purpose, simplifying the structure and facilitating assembly.

[0036] The annular pressing piece 11 is a pressing cap screwed onto the output shaft 5 to facilitate the disassembly and assembly of the sprocket 10 and facilitate subsequent maintenance.

[0037] In actual products, the sealing cover 2 is a cast integral part. Example 2

[0038] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that: the annular pressing member 11 is a pressing ring, and the pressing ring is fixedly connected to the output shaft 5 by welding.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A speed reduction motor, comprising a barrel (1), a sealing cover (2), and a front end cover (3) fixed between the sealing cover (2) and the barrel (1). An installation cavity is formed between the sealing cover (2) and the front end cover (3). An output shaft (5) is rotatably arranged in the installation cavity. A rotor shaft (4) is arranged in the barrel (1). The front end of the rotor shaft (4) extends into the installation cavity and is connected to the rear end of the output shaft (5) through a gear structure. The front end of the output shaft (5) passes through the sealing cover (2). A seal is formed between the inner wall of the sealing cover (2) and the output shaft (5) through an oil seal (8). It is characterized in that, A limiting seat (5a) in the shape of a ring is formed at the front end of the output shaft (5). A sealing seat (2a) in the shape of a ring is formed at the front side of the sealing cover (2). The sealing seat (2a) is sleeved outside the output shaft (5), and the sealing seat (2a), the limiting seat (5a) and the output shaft (5) are coaxially arranged. The limiting seat (5a) is arranged at the front side of the sealing seat (2a) and the two do not contact. An annular groove is formed on the front end face of the sealing seat (2a). A rubber ring (9) with a shape and size matching that of the annular groove is arranged in the annular groove. The front side of the rubber ring (9) extends out of the annular groove and presses against the rear end face of the limiting seat (5a), and the rear side of the rubber ring (9) presses against the bottom face of the annular groove.

2. The speed reduction motor according to claim 1, wherein, A sprocket (10) is sleeved on the front end of the above-mentioned output shaft (5), and the sprocket (10) and the output shaft (5) are circumferentially matched by a flat key or a spline. An annular pressing member (11) is also sleeved and fixed on the output shaft (5), and the front and rear end faces of the sprocket (10) are respectively pressed tightly against the annular pressing member (11) and the limiting seat (5a).

3. The speed reduction motor according to claim 2, characterized in that, The annular pressing member (11) is a pressing cap screwed on the output shaft (5).

4. The speed reduction motor according to claim 2, wherein The annular pressing member (11) is a pressing ring, and the pressing ring is fixedly connected to the output shaft (5) by welding.

5. The speed reduction motor according to claim 1, wherein The axial cross-section of the rubber ring (9) is circular.

6. The speed reduction motor according to claim 1, characterized in that, The bottom wall of the limiting seat (5a) extends downward to form a retaining ring (5b). The retaining ring (5b) is sleeved outside the upper end of the sealing seat (2a), and the inner diameter of the retaining ring (5b) is larger than the outer diameter of the sealing seat (2a).

7. The speed reduction motor according to claim 1, wherein The sealing cover (2) is an integrally cast part.

8. The reduction motor according to claim 1, characterized in that, The output shaft (5) is rotationally matched with the sealing cover (2) through a front bearing (6). The output shaft (5) is also rotationally matched with the front end cover (3) through a rear bearing, and both the front bearing (6) and the rear bearing are arranged in the installation cavity.

9. The speed reduction motor according to claim 8, wherein, An annular step one (2b) and an annular step two are formed on the inner wall of the sealing cover (2), and the annular step one (2b) and the annular step two are continuously distributed front and rear. The front bearing (6) and the oil seal (8) are respectively arranged in the annular step one (2b) and the annular step two, and the front and rear sides of the oil seal (8) are respectively pressed against the bottom face of the annular step one (2b) and the outer ring of the front bearing (6).

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