Speed reducer with dustproof structure

Abstract

The utility model discloses a speed reducer with dustproof structure applied to the field of speed reducer, through setting two -stage dustproof unit in the inner side of dust cover, form by dust cover and two -stage dustproof unit constitute double -layer dustproof protection, when dust cover excess abrasion, dust that seeps in the gap between power output shaft and dust cover can enter into the capture shell through the air hole, and is enriched in the capture shell, and the capture shell can rotate with the power output shaft in the normal working process of speed reducer, and the dust that enters the capture shell can gather in the direction of far from the capture shell under the action of centrifugal force, even after the subsequent stop rotating, the dust is not easy to pass through the elastic fiber again, then escapes from the capture shell through the air hole, and the phenomenon that the dust is not easy to appear again, and the working environment of power output shaft and dust cover is not easy to cause the influence, further increase the security of speed reducer use.

Description

Technical Field

[0001] This utility model relates to the field of speed reducers, and in particular to a speed reducer with a dustproof structure. Background Technology

[0002] Gear reducers are generally used in low-speed, high-torque transmission equipment. They reduce the speed of electric motors, internal combustion engines, or other high-speed power sources by meshing a gear with fewer teeth on the input shaft with a larger gear on the output shaft. Ordinary gear reducers may also have several pairs of gears that work on the same principle to achieve the desired speed reduction effect. The ratio of the number of teeth on the large gear to the number of teeth on the small gear is the transmission ratio.

[0003] The utility model disclosed in CN221779953U is a worm gear reducer with a dust cover structure. By setting an mounting ring, a dust cover ring, and a stabilizing ring around the connection between the worm gear reducer body and the output shaft, the gap at the connection is covered, reducing the amount of dust entering the worm gear reducer body from the gap at the connection, thus achieving an effective dust prevention effect. When the output shaft rotates, it drives the dust cover ring and the stabilizing ring to rotate relative to the mounting ring. The setting of ball bearings one and two does not affect the rotation of the dust cover ring and the stabilizing ring, and at the same time effectively reduces the frictional resistance generated between the dust cover ring and the stabilizing ring and the mounting ring during rotation, thus facilitating the power output of the output shaft.

[0004] The utility model disclosed in CN207316039U is a robot dustproof and shock-absorbing reducer. The robot dustproof and shock-absorbing reducer is equipped with a connecting sleeve, which can seal the gap between the reducer body and the transmission shaft, and at the same time facilitate the cleaning of its interior without disassembling the entire device, thus saving maintenance time.

[0005] Existing dustproof structures for speed reducers are usually standalone. While they can effectively prevent dust when working properly, excessive wear can easily allow dust and other harmful contaminants from the environment to enter the speed reducer's transmission structure or internal gears, causing wear on the transmission structure or internal gears. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] The core of this invention lies in solving the problem that existing dustproof structures only offer single-layer dustproof protection through the design of a two-stage dustproof unit. Simultaneously, the internal space of the two-stage dustproof unit can accumulate infiltrated dust, preventing dust re-spread and minimizing disruption to the normal operation of the reducer.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A speed reducer with a dustproof structure includes a speed reducer housing, which comprises a lower housing and an upper housing fixedly connected. A power output shaft is installed between the lower housing and the upper housing. A dust cover and a bearing are installed between the lower housing and the upper housing, with both the dust cover and the bearing fitted onto the outside of the power output shaft, and the dust cover located outside the bearing. A secondary dustproof unit is fitted onto the outside of the power output shaft, located between the dust cover and the bearing. The secondary dustproof unit includes a capture housing. The inner ring of the capture housing near the dust cover has a chamfer, and multiple vent holes are formed near the chamfer, connecting the interior of the capture housing to the outside. The capture housing is filled with multiple elastic fibers, each in a three-dimensional spiral shape, with adjacent elastic fibers overlapping to form a three-dimensional structure. A sealing ring is fixedly connected to one end of the capture housing near the dust cover, located outside the multiple vent holes. An elastic element is provided between the secondary dustproof unit and the bearing, with both ends of the elastic element contacting the bearing and the secondary dustproof unit, respectively.

[0011] Furthermore, the portion of the capture housing near the power output shaft is made of an elastic material, while the portion away from the power output shaft is made of a rigid material. The capture housing and the power output shaft are interference-fitted, and the contact surfaces of the sealing ring and the dust cover are both smooth surfaces. The friction between the capture housing and the power output shaft is greater than the friction between the sealing ring and the power dust cover. Without affecting the sealing effect between the dust cover and the secondary dust protection unit, the movement of the secondary dust protection unit with the power output shaft is smoother. At the same time, when the sealing ring wears, the entire secondary dust protection unit will move towards the dust cover under the action of the elastic element, making the seal between the dust cover and the secondary dust protection unit less susceptible to damage.

[0012] Furthermore, multiple elastic supports are fixedly connected to the inner wall of the capture shell. These elastic supports overlap each other, and multiple elastic fibers are wound around the multiple elastic supports respectively. This makes it difficult for the multiple elastic fibers to accumulate excessively locally under the action of centrifugal force, and makes it easy for the multiple elastic fibers to maintain a three-dimensional structure.

[0013] Meanwhile, the dust cover, the capture shell, and the elastic fiber are all made of colorless and transparent materials. A pre-embedded strip is embedded in the sealing ring. The pre-embedded strip is made of colored crayon. When the sealing ring is worn excessively, the pre-embedded strip will be exposed and form a mark on the dust cover. This allows the staff to immediately judge the sealing effect between the dust cover and the secondary dustproof unit by observing the dust cover, and to reasonably arrange maintenance and replacement work.

[0014] Furthermore, the end of the dust cover near the capture shell has a frosted surface, which makes it easier to fix the marks formed by the sealing ring on the inner wall of the dust cover, facilitating observation.

[0015] Furthermore, a reflector is fixedly connected to the inner wall of the capture housing near the bearing side. The reflector is coated with fluorescent pigment. During routine maintenance of the reducer, the secondary dustproof unit can be determined by shining light into the dust cover and based on the range of the reflected light.

[0016] 3. Beneficial Effects

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] This solution establishes a two-stage dustproof unit, forming a double-layer dustproof protection consisting of a dust cover and the two-stage dustproof unit. When the dust cover wears excessively, dust that seeps in from the gap between the power output shaft and the dust cover will enter the capture housing through the vent and accumulate inside. During normal operation of the reducer, the capture housing rotates with the power output shaft. The dust that has entered the capture housing will gradually gather away from the capture housing under the action of centrifugal force, making it difficult for the dust to escape from the capture housing through the vent and thus less likely to affect the working environment of the power output shaft and the dust cover.

[0019] Meanwhile, the pre-embedded strips allow staff to promptly assess the wear of the sealing ring by observing the dust cover. The reflector allows for the determination of the amount of dust within the secondary dustproof unit by shining light onto the dust cover and analyzing the range of reflected light, facilitating routine maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the reducer with a dustproof structure according to the present invention.

[0021] Figure 2 This is a side sectional view of the output shaft of the reducer of this utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at point A;

[0023] Figure 4 for Figure 2 Schematic diagram of the structure at point B;

[0024] Figure 5 This is a schematic diagram of the structure of the secondary dustproof unit of this utility model;

[0025] Explanation of the labels in the diagram:

[0026] 1. Gearbox housing, 101. Lower housing, 102. Upper housing, 2. Power output shaft, 3. Dust cover, 4. Bearing, 5. Secondary dustproof unit, 501. Capture housing, 502. Vent hole, 503. Sealing ring, 504. Embedded strip, 505. Elastic bracket, 506. Elastic fiber, 507. Reflector, 6. Elastic element. Detailed Implementation

[0027] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0028] Example 1: Please refer to Figures 1-3 and Figure 5 A speed reducer with a dustproof structure includes a speed reducer housing 1. The speed reducer housing 1 includes a lower housing 101 and an upper housing 102 fixedly connected. A power output shaft 2 is installed between the lower housing 101 and the upper housing 102. One end of the power output shaft 2, extending into the speed reducer housing 1, is fixedly connected to a gear in a gear set installed inside the speed reducer housing 1. A dust cover 3 and a bearing 4 are installed between the lower housing 101 and the upper housing 102, with both the dust cover 3 and the bearing 4 fitted onto the outside of the power output shaft 2, and the dust cover 3 located outside the bearing 4. A secondary dustproof unit 5 is fitted onto the outside of the power output shaft 2, and the secondary dustproof unit 5 is located between the dust cover 3 and the bearing 4. The secondary dustproof unit 5 includes a capture housing 501. The inner ring of the outer shell 501 near the dust cover 3 has a chamfer, and the outer shell 501 near the chamfer has multiple vent holes 502. The multiple vent holes 502 connect the inside of the outer shell 501 to the outside. The outer shell 501 is filled with multiple elastic fibers 506, which are all in a three-dimensional spiral shape. Two adjacent elastic fibers 506 overlap to form a three-dimensional structure. A sealing ring 503 is fixedly connected to one end of the outer shell 501 near the dust cover 3. The sealing ring 503 is located outside the multiple vent holes 502. An elastic element 6 is provided between the secondary dustproof unit 5 and the bearing 4. The two ends of the elastic element 6 are in contact with the bearing 4 and the secondary dustproof unit 5, respectively. The elastic element 6 is preferably a compression spring.

[0029] In this embodiment, a double-layer protection is formed by the dust cover 3 and the secondary dustproof unit 5. When the dust cover 3 is excessively worn, the space inside the reducer housing 1 is sealed by the dust cover 3 and the sealing ring 503, making it difficult for dust to enter the reducer housing 1 from the gap between the dust cover 3 and the bearing 4. This reduces the risk of excessive wear on the parts inside the reducer housing 1. At the same time, dust that seeps in from the gap between the power output shaft 2 and the dust cover 3 will enter the capture housing 501 through the vent 502 and accumulate inside the capture housing 501. During normal operation of the reducer, the capture housing 501 will rotate with the power output shaft 2. The dust that enters the capture housing 501 will gradually gather away from the capture housing 501 under the action of centrifugal force, making it difficult for dust to escape from the capture housing 501 through the vent 502. This reduces the risk of affecting the working environment of the power output shaft 2 and the dust cover 3.

[0030] The portion of the capture housing 501 near the power output shaft 2 is made of an elastic material, while the portion away from the power output shaft 2 is made of a rigid material. The capture housing 501 and the power output shaft 2 are interference-fitted. The contact surfaces of the sealing ring 503 and the dust cover 3 are both smooth surfaces. The friction between the capture housing 501 and the power output shaft 2 is greater than that between the sealing ring 503 and the dust cover 3. Without affecting the sealing effect between the dust cover 3 and the secondary dustproof unit 5, the movement of the secondary dustproof unit 5 with the power output shaft 2 is made smoother. At the same time, when the sealing ring 503 wears, the entire secondary dustproof unit 5 will move towards the dust cover 3 under the action of the elastic element 6, making the seal between the dust cover 3 and the secondary dustproof unit 5 less susceptible to damage.

[0031] Multiple elastic supports 505 are fixedly connected to the inner wall of the capture shell 501. The multiple elastic supports 505 overlap each other, and multiple elastic fibers 506 are respectively wrapped around the multiple elastic supports 505, so that the multiple elastic fibers 506 are not prone to excessive local aggregation under the action of centrifugal force, and the multiple elastic fibers 506 are easy to maintain a three-dimensional structure.

[0032] Example 2: Please refer to Figures 2-4 The dust cover 3, the capture shell 501, and the elastic fiber 506 are all made of colorless and transparent materials. A pre-embedded strip 504 is embedded in the sealing ring 503. The pre-embedded strip 504 is made of colored crayon. When the sealing ring 503 is worn excessively, the pre-embedded strip 504 will be exposed and form a mark on the dust cover 3. This allows the staff to judge the wear degree of the sealing ring 503 in a timely manner by observing the dust cover 3 and to arrange maintenance and replacement work in a reasonable manner.

[0033] The end of the dust cover 3 near the capture housing 501 has a frosted surface. At this time, the friction between the capture housing 501 and the power output shaft 2 is still greater than the friction between the sealing ring 503 and the dust cover 3, making it easier for the marks formed by the sealing ring 503 to be fixed on the inner wall of the dust cover 3, which is convenient for observation.

[0034] A reflector 507 is fixedly connected to the inner wall of the capture housing 501 near the bearing 4. The reflector 507 is coated with fluorescent pigment. When performing routine maintenance on the reducer, the amount of dust in the secondary dustproof unit 5 can be determined by shining light into the dust cover 3 and the range of the reflected light, which facilitates the arrangement of routine maintenance work. The shining light can be generated by carrying a flashlight.

[0035] Compared to Embodiment 1, this embodiment further improves the secondary dustproof unit 5. Although this increases the processing difficulty of the secondary dustproof unit 5 and raises its usage cost, compared to Embodiment 1, it can effectively monitor the sealing performance of the dustproof cover 3 and the secondary dustproof unit 5, and measure the amount of dust entering the secondary dustproof unit 5. This is suitable for environments with high dust levels, making it easier for staff to observe during daily maintenance and perform timely maintenance and replacement work.

[0036] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A speed reducer with a dustproof structure, comprising a speed reducer housing (1), the speed reducer housing (1) comprising a lower housing (101) and an upper housing (102) fixedly connected, wherein a power output shaft (2) is installed between the lower housing (101) and the upper housing (102), characterized in that: A dust cover (3) and a bearing (4) are installed between the lower housing (101) and the upper housing (102), and both the dust cover (3) and the bearing (4) are sleeved on the outside of the power output shaft (2), with the dust cover (3) located on the outside of the bearing (4). A secondary dustproof unit (5) is sleeved on the outside of the power output shaft (2), and the secondary dustproof unit (5) is located between the dust cover (3) and the bearing (4). The secondary dustproof unit (5) includes a capture shell (501), and the inner ring of the capture shell (501) near the dust cover (3) has a chamfer, and the capture shell (501) near the chamfer has multiple vent holes (502). The ventilation holes (502) are all connected to the inside of the capture shell (501) and the outside. The capture shell (501) is filled with multiple elastic fibers (506). The multiple elastic fibers (506) are all in a three-dimensional spiral shape. Two adjacent elastic fibers (506) overlap each other to form a three-dimensional structure. A sealing ring (503) is fixedly connected to one end of the capture shell (501) near the dust cover (3). The sealing ring (503) is located outside the multiple ventilation holes (502). An elastic element (6) is provided between the secondary dustproof unit (5) and the bearing (4). The two ends of the elastic element (6) are in contact with the bearing (4) and the secondary dustproof unit (5) respectively.

2. The speed reducer with a dustproof structure according to claim 1, characterized in that: The portion of the capture housing (501) near the power output shaft (2) is made of an elastic material, while the portion of the capture housing (501) away from the power output shaft (2) is made of a rigid material. The capture housing (501) and the power output shaft (2) are interference-fitted. The contact surfaces of the sealing ring (503) and the dust cover (3) are both smooth surfaces. The friction between the capture housing (501) and the power output shaft (2) is greater than the friction between the sealing ring (503) and the power output shaft (2).

3. A speed reducer with a dustproof structure according to claim 1, characterized in that: The inner wall of the capture shell (501) is fixedly connected with a plurality of elastic supports (505), the plurality of elastic supports (505) overlap each other, and the plurality of elastic fibers (506) are respectively wound around the plurality of elastic supports (505).

4. A speed reducer with a dustproof structure according to claim 1, characterized in that: The dust cover (3), the capture shell (501) and the elastic fiber (506) are all made of colorless and transparent material, and a pre-embedded strip (504) is embedded in the sealing ring (503).

5. A speed reducer with a dustproof structure according to claim 1, characterized in that: The dust cover (3) has a frosted surface at the end near the capture shell (501).

6. A speed reducer with a dustproof structure according to claim 1, characterized in that: A reflector (507) is fixedly connected to the inner wall of the capture housing (501) near the bearing (4), and the reflector (507) is coated with fluorescent pigment.

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