Underwater planetary gear reducer

Abstract

This utility model discloses an underwater planetary reducer, including a housing, a transmission mechanism, and a sealing assembly. An output flange with a gear ring on its inner circumferential wall is installed inside the housing. The transmission mechanism includes a stepped output shaft, a sun gear, and multiple planetary gears. The input end of the output shaft is fitted inside the output flange. A hollow rotating sealing flange is fitted over the middle of the output shaft, with one end of the sealing flange near the input end of the output shaft connected to the output flange. The output end of the sun gear is fitted inside the input end of the output shaft. Multiple planetary gears are located inside the gear ring, spaced apart circumferentially along the sun gear. The planetary gears are inserted radially into the input end of the output shaft, meshing with the sun gear and the gear ring. The sealing assembly includes a mechanical seal, a first skeleton oil seal, and a second skeleton oil seal. The mechanical seal is located between the sealing flange and the output shaft. The first and second skeleton oil seals are both located between the input end of the output shaft and the output flange, distributed sequentially along the axial direction. This achieves triple water ingress protection and improves sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, specifically to a planetary speed reducer for underwater use. Background Technology

[0002] Traditional planetary gearboxes require waterproof sealing when used underwater. They typically use a single mechanical seal to prevent water from entering the gearbox. However, mechanical seals have poor sealing quality and short service life. After a period of operation, the seal may fail, causing water to enter the planetary gearbox, leading to grease lubrication failure and ultimately damaging the planetary gearbox. Utility Model Content

[0003] The main purpose of this invention is to propose an underwater planetary gear reducer, which aims to solve the above-mentioned problems.

[0004] To achieve the above objectives, this utility model proposes an underwater planetary gear reducer, comprising:

[0005] The housing has an output flange fixedly installed inside it, and the inner peripheral wall of the output flange is provided with a toothed ring.

[0006] A transmission mechanism includes an output shaft, a sun gear, and multiple planetary gears. The output shaft is stepped, with its input end fitted inside an output flange. A hollow rotating sealing flange is fitted over the middle of the output shaft, with one end of the sealing flange near the input end of the output shaft fixedly connected to the output flange. The output end of the sun gear is fitted inside the input end of the output shaft. Multiple planetary gears are disposed within a gear ring and spaced circumferentially along the sun gear. Each planetary gear is radially inserted into the input end of the output shaft and meshes with the sun gear and the gear ring.

[0007] The sealing assembly includes a mechanical seal, a first skeleton oil seal, and a second skeleton oil seal. The mechanical seal is disposed between the sealing flange and the output shaft. The first skeleton oil seal and the second skeleton oil seal are both disposed between the input end of the output shaft and the output flange, and the first skeleton oil seal and the second skeleton oil seal are distributed sequentially along the axial direction of the output shaft.

[0008] Optionally, the first skeleton oil seal is positioned relative to the second skeleton oil seal near the output end of the output shaft;

[0009] The first skeleton oil seal is provided with lubricating grease on both sides of the output shaft in the axial direction.

[0010] Optionally, a gasket is provided inside the output flange, the gasket is located between the first skeleton oil seal and the second skeleton oil seal, and together with the output shaft, the first skeleton oil seal and the second skeleton oil seal, forms a first accommodating space, the first accommodating space containing the lubricating grease.

[0011] Optionally, the output flange has a stop protruding from the output shaft at one end near the output end of the output shaft;

[0012] A second accommodating space is formed between the stop portion and the first skeleton oil seal, and the second accommodating space contains the lubricating grease.

[0013] Optionally, there is a gap between the stop portion and the output shaft, and the gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0014] Optionally, the underwater planetary reducer further includes at least one water level sensor, which is disposed on the sealing flange and located between the mechanical seal and the first skeleton oil seal. The water level sensor is used for electrical connection with an external controller.

[0015] Optionally, the housing is further provided with an input flange, which is located at the end of the output flange away from the sealing flange. A first bearing is provided between the input flange and the sun gear, and a second bearing is provided between the input flange and the input end of the output shaft.

[0016] The sealing assembly further includes a third skeleton oil seal, which is disposed between the input flange and the sun gear, and located between the first bearing and the second bearing.

[0017] Optionally, a retaining ring groove is provided on the outer peripheral wall of the sun gear. The retaining ring groove extends circumferentially along the sun gear and is located on the side of the first bearing away from the output shaft. A shaft elastic retaining ring is provided in the retaining ring groove.

[0018] Optionally, the transmission mechanism further includes a planetary carrier, which is connected to the input end of the output shaft and is provided with a plurality of pins. Each pin is fitted with a planetary gear, and a third bearing is provided between the pin and the planetary gear.

[0019] Optionally, a fourth bearing is provided between the output flange and the input end of the output shaft.

[0020] In the technical solution of this utility model, the mechanical seal is used as the main seal, and the first skeleton oil seal and the second skeleton oil seal are used as auxiliary seals to achieve triple water ingress protection for the underwater planetary reducer, which greatly improves the underwater sealing performance of the underwater planetary reducer. Thus, when the mechanical seal fails to waterproof, the first skeleton oil seal and the second skeleton oil seal can still provide waterproofing, thereby preventing the underwater planetary reducer from being damaged by internal water ingress and ensuring that the underwater planetary reducer can continue to work normally without the need for the underwater planetary reducer to be shut down for maintenance. Attached Figure Description

[0021] 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, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of the underwater planetary reducer provided by this utility model.

[0023] Explanation of icon numbers:

[0024]

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Traditional planetary gearboxes require waterproof sealing when used underwater. They typically use a single mechanical seal to prevent water from entering the gearbox. However, mechanical seals have poor sealing quality and short service life. After a period of operation, the seal may fail, causing water to enter the planetary gearbox, leading to grease lubrication failure and ultimately damaging the planetary gearbox.

[0030] In view of this, the present invention provides an underwater planetary reducer 100. Figure 1 This invention provides an embodiment of the underwater planetary reducer 100.

[0031] Please see Figure 1The underwater planetary reducer 100 includes a housing, a transmission mechanism 1, and a sealing assembly 2. An output flange 3 is fixedly installed inside the housing, and a gear ring is provided on the inner circumferential wall of the output flange 3. The transmission mechanism 1 includes an output shaft 11, a sun gear 12, and multiple planet gears 13. The output shaft 11 is stepped, and its input end is fitted inside the output flange 3. A hollow rotating sealing flange 14 is fitted over the middle of the output shaft 11. The end of the sealing flange 14 near the input end of the output shaft 11 is fixedly connected to the output flange 3. The output end of the sun gear 12 is fitted inside the input end of the output shaft 11. The multiple planet gears 13... The planetary gears 13 are disposed within the gear ring and are distributed circumferentially around the sun gear 12. Each planetary gear 13 is inserted radially into the input end of the output shaft 11 and is adapted to mesh with the sun gear 12 and the gear ring. The sealing assembly 2 includes a mechanical seal 21, a first skeleton oil seal 22, and a second skeleton oil seal 23. The mechanical seal 21 is disposed between the sealing flange 14 and the output shaft 11. The first skeleton oil seal 22 and the second skeleton oil seal 23 are both disposed between the input end of the output shaft 11 and the output flange 3, and the first skeleton oil seal 22 and the second skeleton oil seal 23 are distributed sequentially along the axial direction of the output shaft 11.

[0032] In this utility model's technical solution, the mechanical seal 21 is used as the main seal, and the first skeleton oil seal 22 and the second skeleton oil seal 23 are used as auxiliary seals to achieve triple water ingress protection for the underwater planetary reducer 100, greatly improving the underwater sealing performance of the underwater planetary reducer 100. Thus, when the mechanical seal 21 fails to waterproof, the first skeleton oil seal 22 and the second skeleton oil seal 23 can still waterproof, thereby preventing the underwater planetary reducer 100 from being damaged by internal water ingress, ensuring that the underwater planetary reducer 100 can continue to work normally without the need for the underwater planetary reducer 100 to be shut down for maintenance.

[0033] It should be noted that the working process of the underwater planetary reducer 100 provided by this utility model is as follows: the sun gear 12 is driven to rotate, the sun gear 12 is adapted to mesh with the planet gear 13, thereby driving the planet gear 13 to rotate, the planet gear 13 meshes with the output flange 3, and since the output flange 3 is fixed, the planet gear 13 drives the output shaft 11 to rotate, thus completing the transmission of torque force.

[0034] Furthermore, the first skeleton oil seal 22 is disposed near the output end of the output shaft 11 relative to the second skeleton oil seal 23; the first skeleton oil seal 22 is provided with lubricating grease on both sides of the output shaft 11 in the axial direction; in this way, the first skeleton oil seal 22 can be prevented from burning out due to dry friction.

[0035] Further, please refer to Figure 1 The output flange 3 is fitted with a gasket 4, which is located between the first skeleton oil seal 22 and the second skeleton oil seal 23, and together with the output shaft 11, the first skeleton oil seal 22 and the second skeleton oil seal 23, forms a first accommodating space. The first accommodating space contains the lubricating grease, that is, the first skeleton oil seal 22 is provided with lubricating grease on one side of the output shaft 11 in the axial direction.

[0036] For details, please refer to Figure 1 The output flange 3 has a stop portion protruding from the output shaft 11 at one end near the output end of the output shaft 11; the stop portion and the first skeleton oil seal 22 form a second accommodating space, and the second accommodating space contains the lubricating grease, that is, the first skeleton oil seal 22 is provided with lubricating grease on the other side of the axial direction of the output shaft 11, and the grease is prevented from leaking out by setting the stop portion.

[0037] Furthermore, in order to prevent the output flange 3 from rubbing against the output shaft 11, there is a gap between the stop portion and the output shaft 11, and the gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0038] For details, please refer to Figure 1 The underwater planetary reducer 100 also includes at least one water level sensor 5, which is disposed on the sealing flange 14 and located between the mechanical seal 21 and the first skeleton oil seal 22. The water level sensor 5 is used for electrical connection with an external controller.

[0039] Thus, the water level sensor 5 monitors whether the mechanical seal 21 has failed to waterproof, causing water to enter the sealing flange 14. If water is detected, the water level sensor 5 sends a signal to the external controller to remind the staff.

[0040] More specifically, in this invention, the number of water level sensors 5 is not limited; it can be one, two, three, etc.

[0041] For details, please refer to Figure 1The housing also includes an input flange 6, located at the end of the output flange 3 furthest from the sealing flange 14. A first bearing 7 is provided between the input flange 6 and the sun gear 12, and a second bearing 8 is provided between the input flange 6 and the input end of the output shaft 11. The sealing assembly 2 also includes a third skeleton oil seal, located between the input flange 6 and the sun gear 12, and between the first bearing 7 and the second bearing 8. Thus, the input flange 6 is bearing-connected to the sun gear 12, and the input flange 6 is bearing-connected to the output shaft 11, thereby improving the stability of the output shaft 11.

[0042] More specifically, in one embodiment of this utility model, the first bearing 7 is a ball bearing, and the second bearing 8 is a tapered roller bearing.

[0043] Specifically, in one embodiment of this utility model, the input flange 6 and the output flange 3 are fixedly connected by screws.

[0044] For details, please refer to Figure 1 The outer peripheral wall of the sun gear 12 is provided with a retaining ring groove, which extends along the circumference of the sun gear 12 and is located on the side of the first bearing 7 away from the output shaft 11. A shaft elastic retaining ring 9 is provided in the retaining ring groove.

[0045] For details, please refer to Figure 1 The transmission mechanism 1 further includes a planetary carrier, which is connected to the input end of the output shaft 11 and is provided with a plurality of pins 10. Each pin 10 is fitted with a planetary gear 13, and a third bearing 1A is provided between the pin 10 and the planetary gear 13.

[0046] Furthermore, the number of planetary gears 13 is 3-6, and correspondingly, the number of pins 10 is 3-6.

[0047] More specifically, in one embodiment of this utility model, the third bearing 1A is a roller bearing.

[0048] For details, please refer to Figure 1 A fourth bearing 1B is provided between the output flange 3 and the input end of the output shaft 11.

[0049] More specifically, in one embodiment of this utility model, the fourth bearing 1B is a tapered roller bearing.

[0050] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An underwater planetary reducer characterized by comprising: The underwater planetary gear reducer includes: The housing has an output flange fixedly installed inside it, and the inner peripheral wall of the output flange is provided with a toothed ring. A transmission mechanism includes an output shaft, a sun gear, and multiple planetary gears. The output shaft is stepped, with its input end fitted inside an output flange. A hollow rotating sealing flange is fitted over the middle of the output shaft, with one end of the sealing flange near the input end of the output shaft fixedly connected to the output flange. The output end of the sun gear is fitted inside the input end of the output shaft. Multiple planetary gears are disposed within a gear ring and spaced circumferentially along the sun gear. Each planetary gear is radially inserted into the input end of the output shaft and meshes with the sun gear and the gear ring. The sealing assembly includes a mechanical seal, a first skeleton oil seal, and a second skeleton oil seal. The mechanical seal is disposed between the sealing flange and the output shaft. The first skeleton oil seal and the second skeleton oil seal are both disposed between the input end of the output shaft and the output flange, and the first skeleton oil seal and the second skeleton oil seal are distributed sequentially along the axial direction of the output shaft.

2. The underwater planetary reducer as claimed in claim 1, characterized by, The first skeleton oil seal is positioned relative to the second skeleton oil seal near the output end of the output shaft; The first skeleton oil seal is provided with lubricating grease on both sides of the output shaft in the axial direction.

3. The underwater planetary reducer according to claim 2, wherein The output flange is fitted with a gasket, which is located between the first skeleton oil seal and the second skeleton oil seal, and together with the output shaft, the first skeleton oil seal, and the second skeleton oil seal, forms a first accommodating space, which contains the lubricating grease.

4. The underwater planetary reducer as claimed in claim 2, wherein The output flange has a stop protruding from the output shaft at one end near the output end of the output shaft. A second accommodating space is formed between the stop portion and the first skeleton oil seal, and the second accommodating space contains the lubricating grease.

5. The underwater planetary reducer as claimed in claim 4, wherein There is a gap between the stop and the output shaft, and the gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

6. The underwater planetary reducer as claimed in claim 2, wherein The underwater planetary reducer also includes at least one water level sensor, which is located on the sealing flange and between the mechanical seal and the first skeleton oil seal. The water level sensor is used for electrical connection with an external controller.

7. The underwater planetary reducer of claim 1, wherein The housing is also provided with an input flange, which is located at the end of the output flange away from the sealing flange. A first bearing is provided between the input flange and the sun gear, and a second bearing is provided between the input flange and the input end of the output shaft. The sealing assembly further includes a third skeleton oil seal, which is disposed between the input flange and the sun gear, and located between the first bearing and the second bearing.

8. The underwater planetary reducer of claim 7, wherein The outer peripheral wall of the sun gear is provided with a retaining ring groove, which extends along the circumference of the sun gear and is located on the side of the first bearing away from the output shaft. A shaft elastic retaining ring is provided in the retaining ring groove.

9. The underwater planetary reducer of claim 1, wherein The transmission mechanism also includes a planetary carrier, which is connected to the input end of the output shaft and is provided with multiple pins. Each pin is fitted with a planetary gear, and a third bearing is provided between the pin and the planetary gear.

10. The underwater planetary reducer as claimed in claim 1, wherein A fourth bearing is provided between the output flange and the input end of the output shaft.

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