Planetary speed reducing mechanism and mechanical transmission device

Abstract

The utility model relates to the technical field of transmission systems, and discloses a planetary reducing mechanism and a mechanical transmission device. The planetary speed reducing mechanism comprises a shell, a sun wheel assembly, a planet wheel assembly and an oil filling pipe. An oil return cavity is formed in the shell; the sun gear assembly is rotatably arranged in the shell; the planet wheel assembly is rotatably arranged in the oil return cavity, a lubricating runner is formed between the planet wheel assembly and the sun wheel assembly, an oil outlet of the lubricating runner is located on a planet shaft of the planet wheel assembly, the planet wheel assembly is further connected with an output shaft, the output shaft is provided with a first shaft hole extending in the axial direction, and the first shaft hole is communicated with an oil inlet of the lubricating runner; the oil injection pipe is inserted into the first shaft hole. According to the planetary speed reducing mechanism, active lubrication and passive lubrication are integrated, the lubrication effect is improved, the use amount of lubricating oil is reduced, oil guide parts do not need to be introduced, the overall structure is simple, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of transmission systems, and in particular to a planetary reduction mechanism and a mechanical transmission device. Background Art

[0002] The planetary reduction mechanism is a commonly used reduction mechanism in the gearbox. The input shaft of the planetary reduction mechanism is connected to the motor shaft. The motor input speed is relatively high. It is necessary to ensure that the planetary gears and bearings are well lubricated and the heat on the friction pair surface is removed in time to prevent the planetary gears and bearings from being burned due to high temperature and causing performance degradation or even failure.

[0003] In the prior art, planetary gear lubrication is divided into active lubrication and passive lubrication. Active lubrication has problems such as complex oil channels, oil pressure loss on the way, and oil loss. Passive lubrication mainly includes oil immersion, splashing, oil pan throwing and other methods, which have problems such as limited lubrication effect, uncontrollable oil volume, and space size limitations. Utility Model Content

[0004] The purpose of the present application is to provide a planetary reduction mechanism and a mechanical transmission device to solve the shortcomings of the planetary reduction mechanism in the prior art that only uses active lubrication or passive lubrication.

[0005] To achieve the above objectives, in a first aspect, the present application provides a planetary reduction mechanism, comprising:

[0006] A housing having an oil return chamber therein;

[0007] A sun gear assembly is rotatably disposed in the oil return chamber and is used for connecting to an external power input mechanism;

[0008] a planetary gear assembly rotatably disposed in the housing and forming a lubrication channel with the sun gear assembly, wherein an oil outlet of the lubrication channel is located on a planetary shaft of the planetary gear assembly, and the planetary gear assembly is further connected to an output shaft, wherein the output shaft is provided with a first shaft hole extending in an axial direction, and the first shaft hole is connected to an oil inlet of the lubrication channel; and

[0009] The oil filling pipe is inserted into the first shaft hole.

[0010] As a further improvement of the above technical solution:

[0011] In a possible implementation manner, the lubrication flow channel includes an oil collecting groove provided on the planet carrier of the planetary gear assembly;

[0012] The oil collecting groove is located on the inner side wall of the planetary carrier, and the oil collecting groove is connected to the first shaft hole, and the oil inlet is provided at the bottom of the oil collecting groove.

[0013] In a possible implementation manner, the oil collecting groove is arranged around the rotation axis of the planet carrier, and the number of the oil inlets is adapted to the number of the planet shafts.

[0014] In a possible implementation manner, the first shaft hole is provided through both ends of the output shaft;

[0015] The sun gear assembly comprises an input shaft for an external power input mechanism, wherein the input shaft is provided with a second shaft hole extending axially from one end close to the oil injection pipe, and the second shaft hole is connected to the first shaft hole.

[0016] In a possible implementation manner, the input shaft and the planet carrier are rotationally matched through a third bearing to form an assembly space, and the assembly space is connected to the oil collecting tank;

[0017] Wherein, the input shaft is further provided with a first oil outlet hole, and two ends of the first oil outlet hole are respectively connected to the second shaft hole and the assembly space.

[0018] In a possible implementation manner, the input shaft is provided with a sun gear body meshing with a planetary gear body in the planetary gear assembly;

[0019] Wherein, the input shaft is provided with the first oil outlet hole connected with the second shaft hole on both sides of the sun gear body.

[0020] In a possible implementation manner, a second oil outlet hole is provided on a peripheral wall of the oil filling pipe inserted into the first axial hole, and an outlet end of the oil filling pipe faces the second axial hole.

[0021] In a possible implementation manner, the lubrication flow channel further includes a first flow channel provided on the planet carrier of the planetary gear assembly and a second flow channel provided on the planet shaft;

[0022] Among them, the number of the first flow channels is adapted to the number of the planetary shafts, one end of the first flow channel is connected to the first shaft hole, and the other end is connected to the corresponding second flow channel, and the second flow channel is connected to the oil outlet arranged on the planetary shaft.

[0023] To achieve the above-mentioned purpose, in a second aspect, the present application further provides a mechanical transmission device, comprising a lubricating oil supply mechanism and a planetary reduction mechanism according to the above-mentioned first aspect.

[0024] As a further improvement of the above technical solution:

[0025] The mechanical transmission device also includes a gear transmission box, the housing is mounted on the housing of the gear transmission box, the gear transmission box is in driving connection with the output shaft, and an oil storage chamber for storing lubricating oil is provided in the housing;

[0026] One end of the lubricating oil supply mechanism is connected to an oil supply pipe, and the other end is connected to the oil filling pipe, and the oil supply pipe extends into the oil storage chamber;

[0027] Wherein, the oil storage chamber is communicated with the oil return chamber.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present application provides a planetary reduction mechanism and a mechanical transmission device, wherein the planetary reduction mechanism injects lubricating oil into the first shaft hole through an oil filling pipe, and the lubricating oil enters the lubrication flow channel formed between the planetary gear assembly and the sun gear assembly under the action of centrifugal force, and then is discharged from the oil outlet on the corresponding planetary shaft to lubricate the planetary gear body and bearing in the planetary gear assembly, thereby realizing active lubrication. Furthermore, the lubricating oil after active lubrication will flow back to the oil return chamber of the shell for storage, so that the lubricating oil in the oil return chamber can be stirred by the high-speed rotation of the planetary gear assembly for passive lubrication. In this way, the planetary reduction mechanism provided by the present application integrates active lubrication and passive lubrication, greatly improving the lubrication effect, reducing the amount of lubricating oil used, and does not require the addition of oil guide components, does not increase the axial size, and has a simple overall structure, reducing costs.

[0030] Furthermore, the liquid level of the lubricating oil in the oil return chamber can be controlled so that the liquid level of the lubricating oil is lower than the lowest position of the planetary shaft, thereby reducing the oil stirring loss caused by the high-speed rotation of the planetary gear assembly.

[0031] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0033] Figure 1 A schematic structural diagram of a planetary reduction mechanism provided in an embodiment of the present application is shown;

[0034] Figure 2 Shows Figure 1 A local enlarged schematic diagram of the middle A;

[0035] Figure 3 Shows Figure 1 A local enlarged schematic diagram of point B in the middle.

[0036] Description of reference numerals:

[0037] 100, housing; 110, oil return chamber;

[0038] 200, internal gear ring;

[0039] 300, sun gear assembly; 310, input shaft; 311, second shaft hole; 312, first oil outlet hole; 320, sun gear body; 330, second bearing; 340, assembly gap; 350, third bearing; 360, assembly space;

[0040] 400, planetary gear assembly; 410, planet carrier; 420, output shaft; 421, first shaft hole; 430, planetary shaft; 440, first bearing; 450, planetary gear body;

[0041] 500, oil filling pipe; 510, outlet end; 520, second oil outlet hole;

[0042] 600, lubrication channel; 601, oil inlet; 602, oil outlet; 610, first channel; 620, second channel; 630, oil collecting tank. DETAILED DESCRIPTION

[0043] The specific implementation of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present application, and is not used to limit the embodiment of the present application.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0045] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0046] Example

[0047] See also Figure 1 , Figure 2 and Figure 3 , this embodiment provides a planetary reduction mechanism that can be used in a mechanical transmission device.

[0048] In this embodiment, the planetary reduction mechanism includes a housing 100, an oil filling pipe 500, an inner gear ring 200, a sun gear assembly 300 and a planetary gear assembly 400 arranged in the housing 100. The housing 100 is provided with an oil return chamber 110, and the oil return chamber 110 can store a certain amount of lubricating oil. The inner gear ring 200 is fixedly installed in the housing 100; the sun gear assembly 300 is rotatably arranged in the housing 100 for an external power input mechanism (such as a motor, a motor or an engine); the planetary gear assembly 400 is rotatably arranged on the housing 100 and accommodated in the oil return chamber 110.

[0049] Furthermore, a lubrication channel 600 is formed between the planetary gear assembly 400 and the sun gear assembly 300, and the lubrication channel 600 has an oil inlet 601 and an oil outlet 602. The oil outlet 602 of the lubrication channel 600 is located on the planetary shaft 430 of the planetary gear assembly 400, and the planetary shaft 430 is provided with a first bearing 440, and a planetary gear body 450 is mounted on the first bearing 440, and the planetary gear body 450 is respectively meshed with the inner gear ring 200 and the sun gear body 320 in the sun gear assembly 300.

[0050] In this embodiment, the planetary gear assembly 400 is further connected to an output shaft 420, and a first shaft hole 421 extending in the axial direction is provided on the end surface of the output shaft 420, and the first shaft hole 421 is connected to the oil inlet 601 of the lubricating flow channel 600. One end of the oil filling pipe 500 is inserted into the first shaft hole 421, and the other end is externally connected to a lubricating oil supply mechanism, and the lubricating oil supply mechanism supplies lubricating oil to the oil filling pipe 500.

[0051] In this way, the lubricating oil supply mechanism supplies lubricating oil to the oil filling pipe 500, and the lubricating oil enters the first shaft hole 421. Then, with the help of the high-speed rotation of the output shaft 420, the lubricating oil enters the lubricating flow channel 600 by using centrifugal force, and the lubricating oil flows through the lubricating flow channel 600 and flows out from the oil outlet 602 on the corresponding planetary shaft 430, thereby lubricating the first bearing 440 on the planetary shaft 430 and lubricating the planetary wheel body 450 on the planetary shaft 430, thereby realizing active lubrication.

[0052] Furthermore, the lubricating oil discharged from the oil outlet 602 on the planetary shaft 430 eventually flows back to the oil return chamber 110 for storage, so that the lubricating oil in the oil return chamber 110 can be stirred by the high-speed rotation of the planetary gear assembly 400 for passive lubrication. In this way, the planetary reduction mechanism provided in this embodiment integrates active lubrication and passive lubrication, greatly improving the lubrication effect, reducing the amount of lubricating oil, and does not require additional oil guide components, does not increase the axial size, and has a simple overall structure, reducing costs.

[0053] Furthermore, the planetary reduction mechanism provided in this embodiment can promptly remove the heat from the friction pair surface, prevent the planetary gear body 450 and the bearing from being ablated due to high temperature and causing performance degradation or even failure, thereby extending the service life.

[0054] Furthermore, the level of the lubricating oil in the oil return chamber 110 can be made lower than the lowest position of the planetary shaft 430 , thereby reducing the oil stirring loss caused by the high-speed rotation of the planetary gear assembly 400 .

[0055] In order to more clearly describe the technical solution of the present application, the planetary reduction mechanism provided in this embodiment is described below, specifically as follows:

[0056] The lubrication channel 600 includes an oil collecting groove 630 disposed on the planet carrier 410 of the planetary gear assembly 400. The oil collecting groove 630 is located on the inner side wall of the planet carrier 410, and the oil collecting groove 630 is connected to the first shaft hole 421. The bottom of the oil collecting groove 630 is provided with an oil inlet 601. In this way, the lubricating oil entering the first shaft hole 421 will first be collected in the oil collecting groove 630, and then enter the oil inlet 601.

[0057] Furthermore, the oil collecting groove 630 is arranged around the rotation axis of the planet carrier 410, that is, the oil collecting groove 630 is an annular oil groove, the number of oil inlets 601 matches the number of planet shafts 430, and each planet shaft 430 is provided with an oil outlet 602, thereby ensuring that the bearings and planetary gear bodies 450 on each planet shaft 430 can be lubricated. At the same time, the oil collecting groove 630 can collect the lubricating oil and then distribute it to each oil inlet 601, ensuring that the lubricating oil entering each oil inlet 601 meets the lubricating demand and the lubricating oil is distributed more evenly.

[0058] The sun gear assembly 300 includes an input shaft 310 for an external power input mechanism, one end of the input shaft 310 extends outside the housing 100, and the other end is rotatably matched with the output shaft 420 through a second bearing 330 to form an assembly gap 340, and a sun gear body 320 is provided on the input shaft 310. In this embodiment, the input shaft 310 and the sun gear body 320 are an integral structure, that is, a gear shaft. Of course, a split structure can also be adopted, and the input shaft 310 and the sun gear body 320 are connected by a key.

[0059] One end of the assembly gap 340 is connected to the first shaft hole 421, and the other end is connected to the oil collecting groove 630. In this way, the lubricating oil collected in the first shaft hole 421 can enter the assembly gap 340 under the action of centrifugal force to lubricate the second bearing 330, and the lubricating oil entering the assembly gap 340 will flow into the oil collecting groove 630 after lubrication, and finally enter the oil inlet 601.

[0060] In this embodiment, the oil collecting groove 630 is located on the inner wall of the planet carrier 410 close to the end surface of the output shaft 420, so that the end surface of the planet carrier 410 can be used to block the lubricating oil, thereby improving the collection effect of the lubricating oil.

[0061] In some embodiments, the oil collecting groove 630 is formed by an inward depression of the circumference of the inner wall of the planet carrier 410 .

[0062] In other embodiments, the oil collecting groove 630 is surrounded by the output shaft 420 and the planetary carrier 410. Specifically, the end of the inner wall of the planetary carrier 410 extends in the axial direction to form an annular boss, and the end face of the output shaft 420 located inside the planetary carrier 410, the inner wall of the planetary carrier 410 and the end face of the annular boss form the oil collecting groove 630.

[0063] Furthermore, the first shaft hole 421 is provided through both ends of the output shaft 420; the input shaft 310 is provided with a second shaft hole 311 extending axially from one end close to the oil injection pipe 500, and the second shaft hole 311 is connected to the first shaft hole 421. In this way, the lubricating oil can enter the second shaft hole 311 from the first shaft hole 421 to cool the input shaft 310, and at the same time, the sun gear body 320 on the input shaft 310 is cooled.

[0064] The input shaft 310 and the planet carrier 410 are rotatably matched through the third bearing 350 to form an assembly space 360, and the assembly space 360 ​​is connected to the oil collecting tank 630. The sun gear body 320 is located in the assembly space 360 ​​and meshes with the planet gear body 450. Among them, the input shaft 310 is also provided with a first oil outlet hole 312, and the two ends of the first oil outlet hole 312 are respectively connected to the second shaft hole 311 and the assembly space 360. In this way, under the high-speed rotation of the input shaft 310, the lubricating oil in the second shaft hole 311 enters the assembly space 360 ​​through the first oil outlet hole 312 under the action of centrifugal force, thereby achieving lubrication and cooling of the third bearing 350 and the sun gear body 320.

[0065] Furthermore, the outlet end 510 of the oil injection pipe 500 faces the inlet of the second shaft hole 311, so that the lubricating oil can smoothly enter the second shaft hole 311, and then enter the assembly space 360 ​​to lubricate the sun gear body 320 and the third bearing 350. Of course, the oil injection pipe 500 can also be inserted into the second shaft hole 311 and have a clearance fit with the second shaft hole 311.

[0066] Optionally, a second oil outlet hole 520 is provided on the peripheral wall of the extending section of the oil filling pipe 500 inserted into the first shaft hole 421 , so that the lubricating oil can enter the first shaft hole 421 through the second oil outlet hole 520 .

[0067] In this embodiment, in order to improve the lubrication and cooling of the sun gear body 320, the input shaft 310 is provided with first oil outlet holes 312 connected to the second shaft hole 311 on both sides of the corresponding sun gear body 320. In this way, through the high-speed rotation of the input shaft 310, under the action of centrifugal force, the lubricating oil in the second shaft hole 311 enters the assembly space 360 ​​through the first oil outlet hole 312 to lubricate the sun gear body 320 and the third bearing 350. It should also be noted that the lubricating oil entering the assembly space 360 ​​is also blocked by the side wall of the planet carrier 410, enters the oil collecting groove 630, and then enters the oil inlet 601 through the oil collecting groove 630.

[0068] It can be understood that the sun gear body 320 needs to mesh with the planet gear body 450. In this way, the sun gear body 320 divides the assembly space 360 ​​into the following parts: Figure 1Thus, first oil outlet holes 312 are provided on both sides of the sun gear body 320 through the input shaft 310, so that sufficient lubricating oil can be introduced into both sides of the sun gear body 320 to better lubricate and cool the sun gear body 320.

[0069] In some examples, the plurality of first oil outlet holes 312 are distributed axially around the input shaft 310 to ensure the flow of lubricating oil into the assembly space 360 ​​.

[0070] Optionally, the plurality of first oil outlet holes 312 are evenly distributed around the axial direction of the input shaft 310 to ensure uniformity of lubricating oil entering the assembly space 360 ​​.

[0071] In this embodiment, the lubrication channel 600 further includes a first channel 610 disposed on the planet carrier 410 of the planetary gear assembly 400 and a second channel 620 disposed on the planetary shaft 430. The number of the first channels 610 matches the number of the planetary shafts 430. One end of the first channel 610 is connected to the oil collecting groove 630 and forms an oil inlet 601. The oil collecting groove 630 is connected to the first shaft hole 421 through the assembly gap 340. The oil collecting groove 630 is also connected to the second shaft hole 311 through the assembly space 360. The other end of the first channel 610 is connected to the corresponding second channel 620, and the second channel 620 is connected to the oil outlet 602 disposed on the planetary shaft 430. The extension direction of the second channel 620 intersects with the axial direction of the planetary shaft 430.

[0072] In the planetary reduction mechanism provided in this embodiment, there are two lines for active lubrication of lubricating oil, wherein:

[0073] The first lubrication route is: the lubricating oil enters the first shaft hole 421, enters the assembly gap 340 under the action of centrifugal force to lubricate the second bearing 330, then enters the oil collecting groove 630, the first flow channel 610 and the second flow channel 620 in sequence, and then is discharged from the oil outlet 602 to lubricate the first bearing 440 and the planetary gear body 450, and finally enters the oil return chamber 110.

[0074] The second lubrication route is: the lubricating oil enters the second shaft hole 311, and under the action of centrifugal force, enters the assembly space 360 ​​through the first oil outlet hole 312 to lubricate the third bearing 350 and the sun gear body 320, and then enters the oil collecting groove 630, the first flow channel 610 and the second flow channel 620 in sequence, and then is discharged from the oil outlet 602 to lubricate the first bearing 440 and the planetary gear body 450, and finally enters the return oil chamber 110.

[0075] It should be noted that the above-mentioned lubricating oil can not only lubricate the transmission structure, but also take away heat to achieve cooling.

[0076] Compared with the prior art, the planetary reduction mechanism provided in this embodiment has the following advantages:

[0077] (1) The planetary reduction mechanism provided in this embodiment can meet the lubrication requirements of the internal structure of the planetary reduction mechanism at high speeds, utilizes a combination of active lubrication and passive lubrication, and provides multi-channel lubrication, thereby improving the efficiency of lubricating oil use, reducing the amount of lubricating oil used, and reducing gear oil churning losses, while ensuring lubrication and cooling effects;

[0078] (2) The planetary reduction mechanism provided in this embodiment is mainly active lubrication mode, supplemented by passive lubrication. Two lubrication lines are provided in the active lubrication mode, and the paths of the lubricating oil of the last two lubrication lines are converged, thereby improving the lubricating oil use efficiency and lubrication reliability;

[0079] (3) The planetary reduction mechanism provided in this embodiment only adds an oil collecting groove 630 on the inner wall of the planet carrier 410, without adding any new parts, thereby not increasing the axial size. The overall structure is simple and compact, and the cost is lower.

[0080] Furthermore, this embodiment also provides a mechanical transmission device, which includes a lubricating oil supply mechanism and a planetary reduction mechanism according to the above embodiment.

[0081] The mechanical transmission device further includes a gear transmission box, the housing 100 is mounted on the housing of the gear transmission box, the gear transmission box is in transmission connection with the output shaft 420, and an oil storage chamber for storing lubricating oil is provided in the housing.

[0082] One end of the lubricating oil supply mechanism is connected to an oil supply pipe, and the other end is connected to an oil filling pipe 500, and the oil supply pipe extends into the oil storage chamber. The oil storage chamber is connected to the oil return chamber 110. The lubricating oil supply mechanism is driven by an oil pump to provide power.

[0083] It can be understood that the oil storage chamber is connected to the oil return chamber 110, so that the liquid level of the lubricating oil in the oil return chamber 110 can be controlled by the oil pump of the lubricating oil supply mechanism, so that the liquid level of the lubricating oil in the oil return chamber 110 is lower than the lowest position of the planetary shaft 430, thereby reducing the oil stirring loss caused by the high-speed rotation of the planetary gear assembly 400.

[0084] It should be noted that the mechanical transmission device may be a gear box, a belt transmission device, a sprocket transmission device or a worm gear transmission device.

[0085] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0086] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A planetary reduction mechanism, characterized in that: include: The housing (100) has an oil return chamber (110) inside; A sun gear assembly (300) is rotatably disposed in the housing (100) and is used for connecting to an external power input mechanism; a planetary gear assembly (400) rotatably disposed in the oil return chamber (110) and forming a lubrication channel (600) with the sun gear assembly (300); an oil outlet (602) of the lubrication channel (600) is located on a planetary shaft (430) of the planetary gear assembly (400); the planetary gear assembly (400) is further connected to an output shaft (420); the output shaft (420) is provided with a first shaft hole (421) extending in an axial direction; the first shaft hole (421) is connected to an oil inlet (601) of the lubrication channel (600); and The oil injection pipe (500) is inserted into the first shaft hole (421).

2. The planetary reduction mechanism according to claim 1, characterized in that: The lubrication channel (600) comprises an oil collecting groove (630) arranged on the planet carrier (410) of the planetary gear assembly (400); The oil collecting groove (630) is located on the inner side wall of the planetary carrier (410), and the oil collecting groove (630) is connected to the first shaft hole (421), and the bottom of the oil collecting groove (630) is provided with the oil inlet (601).

3. The planetary reduction mechanism according to claim 2, characterized in that: The oil collecting groove (630) is arranged around the rotation axis of the planet carrier (410), and the number of the oil inlets (601) is adapted to the number of the planet shafts (430).

4. The planetary reduction mechanism according to claim 2, characterized in that: The first shaft hole (421) is provided through both ends of the output shaft (420); The sun gear assembly (300) comprises an input shaft (310) for an external power input mechanism, wherein the input shaft (310) is provided with a second shaft hole (311) extending axially from one end close to the oil injection pipe (500), and the second shaft hole (311) is connected to the first shaft hole (421).

5. The planetary reduction mechanism according to claim 4, characterized in that: The input shaft (310) and the planet carrier (410) are rotatably matched via a third bearing (350) to form an assembly space (360), and the assembly space (360) is connected to the oil collecting tank (630); The input shaft (310) is also provided with a first oil outlet hole (312), and two ends of the first oil outlet hole (312) are respectively connected to the second shaft hole (311) and the assembly space (360).

6. The planetary reduction mechanism according to claim 5, characterized in that: The input shaft (310) is provided with a sun gear body (320) meshing with a planetary gear body (450) in the planetary gear assembly (400); Wherein, the input shaft (310) is provided with the first oil outlet hole (312) connected to the second shaft hole (311) on both sides of the sun gear body (320).

7. The planetary reduction mechanism according to claim 4, characterized in that: A second oil outlet hole (520) is provided on the peripheral wall of the oil injection pipe (500) inserted into the first shaft hole (421), and the outlet end (510) of the oil injection pipe (500) faces the second shaft hole (311).

8. The planetary reduction mechanism according to any one of claims 1 to 7, characterized in that: The lubrication flow channel (600) further comprises a first flow channel (610) arranged on the planet carrier (410) of the planetary gear assembly (400) and a second flow channel (620) arranged on the planet shaft (430); The number of the first flow channels (610) matches the number of the planetary shafts (430); one end of the first flow channel (610) is connected to the first shaft hole (421); the other end of the first flow channel (610) is connected to the corresponding second flow channel (620); and the second flow channel (620) is connected to the oil outlet (602) provided on the planetary shaft (430).

9. A mechanical transmission device, characterized in that: It comprises a lubricating oil supply mechanism and a planetary reduction mechanism according to any one of claims 1-8.

10. The mechanical transmission device according to claim 9, characterized in that: The mechanical transmission device further comprises a gear transmission box, the housing (100) is mounted on a housing of the gear transmission box, the gear transmission box is in transmission connection with the output shaft (420), and an oil storage chamber for storing lubricating oil is provided in the housing; One end of the lubricating oil supply mechanism is connected to an oil supply pipe, and the other end is connected to the oil filling pipe (500), and the oil supply pipe extends into the oil storage chamber; Wherein, the oil storage chamber is communicated with the oil return chamber (110).

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