Ventilation structure of speed reducer

Abstract

The utility model belongs to the technical field of ventilation and cooling of speed reducers, particularly relates to a ventilation structure of a speed reducer, and aims to solve the problem that the ventilation and cooling effects of lubricating oil are poor due to the fact that an existing ventilation structure is poor in ventilation effect and does not have an auxiliary ventilation function. The top of the reduction gear box is of an opening structure and is provided with a sealing cover, an input shaft is rotationally installed on the right side of the reduction gear box, and an output shaft is rotationally installed on the left side of the reduction gear box; the speed reduction mechanism is arranged in the speed reduction gear box, connected with the input shaft and the output shaft and used for transmission speed reduction; and the circular air duct is welded to the outer side of the reduction gear box, and the outer side of the circular air duct is an opening and is provided with a dustproof mechanism. The speed reducer is simple in structure, in the speed reduction process, kinetic energy is provided to drive the fan to rotate, external air is filtered through the metal filter screen and then ventilated, the ventilation effect is improved, and cooling can be conducted.

Description

Technical Field

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

[0002] With the increasing severity of urban air pollution problems, pure electric vehicles are gaining popularity, and policies are supporting their development. Unlike the powertrain layout of traditional vehicles, pure electric vehicles mostly adopt wheel-side drive. To meet the layout requirements of pure electric vehicles, various transmission system manufacturers have launched various types of wheel-side reducers. When the wheel-side reducer is working, the internal temperature rises, causing a pressure difference between the inside and outside of the reducer. The lubricating oil in the internal cavity vaporizes under the influence of temperature, mixing with the gas in the internal cavity to produce a high-pressure, high-temperature oil-gas mixture. Under pressure, this oil-gas mixture continuously impacts the vent plug and is ejected from it. This causes the lubricating oil in the oil-gas mixture to be sprayed into the atmosphere, resulting in lubricating oil waste. Furthermore, the reduction in lubricating oil seriously affects driving safety. Publication No. CN209539983U discloses a ventilation structure for a speed reducer, including a speed reducer housing. The housing has an inner cavity on its side for storing lubricating oil. A baffle is also provided on the inner wall of the inner cavity, with both ends of the baffle connected to the inner wall of the cavity. The space enclosed by the housing, baffle, and inner wall of the cavity forms an airflow channel. A vent plug is also provided on the inner wall of the cavity to connect the airflow channel with the atmosphere outside the housing. A notch is provided on the top surface of one end of the baffle, through which an oil-gas mixer enters the airflow channel. In this ventilation structure for the speed reducer, as the oil-gas mixture passes through the continuous chambers, the temperature of the oil-gas mixture decreases due to the change in flow velocity, causing the lubricating oil in the mixture to condense into a liquid state and flow back into the inner cavity. This avoids waste of lubricating oil and also prevents damage to the speed reducer due to reduced lubricating oil, thus improving driving safety.

[0003] The existing ventilation structure has poor ventilation effect and lacks auxiliary ventilation function, resulting in poor ventilation and cooling effect of lubricating oil. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing ventilation structures, such as poor ventilation effect, lack of auxiliary ventilation function, and poor ventilation and cooling effect of lubricating oil, and to propose a new ventilation structure for a speed reducer.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A venting structure for a speed reducer includes:

[0007] A reduction gearbox; used for output shaft speed reduction, with an open top and a sealing cover. The input shaft is rotatably mounted on the right side of the reduction gearbox, and the output shaft is rotatably mounted on the left side of the reduction gearbox.

[0008] The speed reduction mechanism is located inside the speed reduction gearbox and is connected to the input and output shafts for transmission speed reduction.

[0009] A circular air duct is welded to the outside of the reduction gearbox. The outside of the circular air duct is open and equipped with a dustproof mechanism. A fan is installed inside the circular air duct.

[0010] The curved cooling air duct is located inside the reduction gearbox and is connected to the circular air duct to cool the lubricating oil.

[0011] Preferably, the reduction mechanism includes a first reduction gear, a second reduction gear, and a third reduction gear. The first reduction gear is fixedly installed on the input shaft, the second reduction gear meshes with the first reduction gear, the second reduction gear meshes with the third reduction gear, and the third reduction gear is fixedly installed on the output shaft.

[0012] Preferably, the diameter of the first reduction gear is smaller than the diameter of the second reduction gear, and the diameter of the second reduction gear is smaller than the diameter of the third reduction gear.

[0013] Preferably, a rotating shaft is fixedly mounted on the second reduction gear, and the rotating shaft is rotatably mounted inside the circular air duct via a bearing.

[0014] Preferably, the outer end of the rotating shaft extends into the circular air duct and is fixedly installed with the fan.

[0015] Preferably, the inner end of the circular air duct is connected to a bend, which extends into the interior of the reduction gearbox and is connected to the curved cooling air duct. The curved cooling air duct is arranged in a curved shape inside the reduction gearbox, and the outlet of the curved cooling air duct extends to the outside of the reduction gearbox.

[0016] Preferably, the dustproof mechanism includes a dustproof plate, which is installed on the outside of the circular air duct. The dustproof plate has pre-drilled filter holes, and a metal filter screen is installed inside the filter holes; the metal filter screen can play a role in dust prevention.

[0017] The beneficial effects of the venting structure for the reducer described in this utility model are as follows:

[0018] This solution uses a first reduction gear and a second reduction gear to drive the rotating shaft to rotate. The second reduction gear drives the output shaft to rotate through a third reduction gear. Since the diameter of the first reduction gear is smaller than the diameter of the second reduction gear, and the diameter of the second reduction gear is smaller than the diameter of the third reduction gear, the rotational speed of the output shaft is reduced. The rotating shaft drives the fan to rotate. Outside air enters the circular air duct after being filtered through a metal filter, and then enters the curved cooling air duct through a bend. The curved arrangement of the curved cooling air duct improves the cooling effect inside the reduction gearbox.

[0019] This invention has a simple structure. During deceleration, it provides kinetic energy to drive the fan to rotate. Outside air is filtered through a metal filter and then ventilated, which accelerates the ventilation effect and can be used for cooling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the ventilation structure of a speed reducer proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of the disassembly sealing cover proposed in this utility model;

[0022] Figure 3 The present utility model proposes Figure 2 A top-view structural diagram;

[0023] Figure 4 This is a three-dimensional structural diagram of the circular air duct and the bent pipe proposed in this utility model;

[0024] Figure 5 A three-dimensional structural diagram of the dustproof plate, metal filter screen, mounting rod and magnetic sheet is provided for this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the rotating shaft, the second reduction gear, and the fan proposed in this utility model.

[0026] In the diagram: 1. Reduction gearbox; 2. Sealing cover; 3. Input shaft; 4. First reduction gear; 5. Rotating shaft; 6. Second reduction gear; 7. Third reduction gear; 8. Output shaft; 9. Circular air duct; 10. Dustproof plate; 11. Filter hole; 12. Metal filter screen; 13. Bend; 14. Curved cooling air duct; 15. Fixing block; 16. Mounting groove; 17. Mounting rod; 18. Magnet; 19. Fan. Detailed Implementation

[0027] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0028] Example 1

[0029] The following is combined Figures 1-6 This application will be described in further detail.

[0030] A venting structure for a speed reducer includes:

[0031] A reduction gearbox 1 is used for output shaft reduction. It has an open top structure and is equipped with a sealing cover 2. An input shaft 3 is rotatably mounted on the right side of the reduction gearbox 1, and an output shaft 8 is rotatably mounted on the left side of the reduction gearbox 1.

[0032] The reduction mechanism is located inside the reduction gearbox 1 and connected to the input shaft 3 and the output shaft 8, and is used for transmission reduction.

[0033] A circular air duct 9 is welded to the outside of the reduction gearbox 1. The outside of the circular air duct 9 is open and equipped with a dustproof mechanism. A fan 19 is installed inside the circular air duct 9.

[0034] The curved cooling air duct 14 is installed inside the reduction gearbox 1 and is connected to the circular air duct 9 to cool the lubricating oil.

[0035] Reference Figure 1 In this embodiment, the reduction mechanism includes a first reduction gear 4, a second reduction gear 6, and a third reduction gear 7. The first reduction gear 4 is fixedly installed on the input shaft 3. The second reduction gear 6 meshes with the first reduction gear 4 and the second reduction gear 6 meshes with the third reduction gear 7. The third reduction gear 7 is fixedly installed on the output shaft 8. The diameter of the first reduction gear 4 is smaller than the diameter of the second reduction gear 6, and the diameter of the second reduction gear 6 is smaller than the diameter of the third reduction gear 7.

[0036] Reference Figure 1 In this embodiment, a rotating shaft 5 is fixedly installed on the second reduction gear 6. The rotating shaft 5 is rotatably installed inside the circular air duct 9 through a bearing. The outer end of the rotating shaft 5 extends into the circular air duct 9 and is fixedly installed with the fan 19.

[0037] Reference Figure 1 In this embodiment, the inner end of the circular air duct 9 is connected to a bend 13, which extends into the interior of the reduction gearbox 1 and is connected to a curved cooling air duct 14. The curved cooling air duct 14 is arranged in a curved shape inside the reduction gearbox 1, and its outlet extends to the outside of the reduction gearbox 1. The dustproof mechanism includes a dustproof plate 10, which is installed on the outside of the circular air duct 9. The dustproof plate 10 has a pre-reserved filter hole 11, and a metal filter screen 12 is provided in the filter hole 11. The metal filter screen 12 can play a dustproof role.

[0038] Working principle: During use, the input shaft 3 is connected to the drive motor. The gearbox 1 is filled with lubricating oil, which lubricates the gears and cools them. The input shaft 3 drives the rotating shaft 5 to rotate through the first reduction gear 4 and the second reduction gear 6. The second reduction gear 6 drives the output shaft 8 to rotate through the third reduction gear 7. Since the diameter of the first reduction gear 4 is smaller than the diameter of the second reduction gear 6, and the diameter of the second reduction gear 6 is smaller than the diameter of the third reduction gear 7, the rotational speed of the output shaft 8 is reduced. The rotating shaft 5 drives the fan 19 to rotate. Outside air enters the circular air duct 9 after being filtered through the metal filter screen 12, and then enters the curved cooling air duct 14 through the bend duct 13. The curved arrangement of the curved cooling air duct 14 provides ventilation, which can improve the cooling effect inside the gearbox 1. The gearbox 1 is in a sealed state, so there will be no oil leakage.

[0039] Example 2

[0040] Example 2 is the same as Example 1 in the rest, except that: four mounting rods 17 are fixedly installed on the inner side of the dustproof plate 10, and four fixing blocks 15 are installed on the inner wall of the circular air duct 9. Each of the four fixing blocks 15 has a mounting groove 16, and each of the four mounting grooves 16 has a magnet 18 embedded in its inner wall. The mounting rods 17 attract the corresponding magnets 18, which improves the stability of the connection between the mounting rods 17 and the fixing blocks 15 and facilitates the installation and disassembly of the dustproof plate 10. All structural shapes, sizes and materials of Example 1 are included in this application. In order to meet specific usage conditions, they can be selected and adjusted. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted appropriately.

[0041] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A breather structure for a speed reducer, characterized by, It includes: The reduction gear box (1) is used for output shaft reduction, the top is open structure and is provided with sealing cover (2), the right side of the reduction gear box (1) is rotatably installed with input shaft (3), and the left side of the reduction gear box (1) is rotatably installed with output shaft (8); The reduction mechanism is arranged in the inside of the reduction gear box (1) and is connected with the input shaft (3) and the output shaft (8), and is used for transmission reduction; The circular air duct (9) is welded on the outside of the reduction gear box (1), the outside of the circular air duct (9) is provided with dust prevention mechanism, and the circular air duct (9) is provided with fan (19) inside; The curved cooling air guide pipe (14) is arranged in the inside of the reduction gear box (1) and is communicated with the circular air duct (9), and is used for cooling lubricating oil.

2. The breather structure for a speed reducer according to claim 1, wherein The reduction mechanism includes first reduction gear (4), second reduction gear (6) and third reduction gear (7), the first reduction gear (4) is fixedly installed with the input shaft (3), the second reduction gear (6) is engaged with the first reduction gear (4), the second reduction gear (6) is engaged with the third reduction gear (7), and the third reduction gear (7) is fixedly installed with the output shaft (8).

3. The breather structure for a speed reducer according to claim 2, wherein The diameter of the first reduction gear (4) is less than the diameter of the second reduction gear (6), and the diameter of the second reduction gear (6) is less than the diameter of the third reduction gear (7).

4. The breather structure for a speed reducer according to claim 2, wherein The rotating shaft (5) is fixedly installed on the second reduction gear (6) and is rotatably installed in the circular air duct (9) through bearing.

5. The breather structure for a speed reducer according to claim 4, wherein The outer end of the rotating shaft (5) extends into the circular air duct (9) and is fixedly installed with the fan (19).

6. The breather structure for a speed reducer according to claim 1, wherein The inner end of the circular air duct (9) is communicated with the elbow pipe (13), the elbow pipe (13) extends to the inside of the reduction gear box (1) and is communicated with the curved cooling air guide pipe (14).

7. The breather structure for a speed reducer according to claim 1, wherein The curved cooling air guide pipe (14) is arranged in the inside of the reduction gear box (1), and the outlet of the curved cooling air guide pipe (14) extends to the outside of the reduction gear box (1).

8. The breather structure for a speed reducer according to claim 1, wherein The dust prevention mechanism includes dustproof plate (10), the dustproof plate (10) is installed on the outside of the circular air duct (9), the dustproof plate (10) is reserved with filter hole (11), and the filter hole (11) is provided with metal filter screen (12).

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