Planetary gear lubricating structure and gear differential mechanism

Abstract

The utility model provides a planetary gear lubricating structure capable of improving the lubricating effect between a planetary gear and a planetary pin and a gear differential. The planetary gear lubricating structure comprises a planetary gear (2) and a planetary pin (3), and the planetary gear (2) is arranged on the planetary pin (3) in a sleeved mode. The planetary pin (3) is provided with: an inner passage (32) that penetrates the planetary pin (3) in the axial direction (X) of the planetary pin (3) and forms the planetary pin (3) into a hollow structure having an inner wall (31); an oil hole (33) that passes through the planetary pin (3) in a direction intersecting the axial direction (X) and that connects a gap between the planetary gear (2) and the planetary pin (3) and the internal passage (32); and a guide portion formed on an inner wall (31) of the planetary pin (3) and connected to the oil hole (33), the guide portion being capable of storing the lubricating oil entering the hollow structure and guiding the lubricating oil to the oil hole (33).

Description

Technical Field

[0001] This application relates to a planetary gear lubrication structure and a gear differential. Background Art

[0002] A gear differential is a device used in a mechanical transmission system. For example, in an automotive transmission system, the gear differential can be used for both straight driving and turning driving of a vehicle.

[0003] During the operation of the gear differential, it is necessary to lubricate the components inside the gear differential. For example, it is necessary to lubricate the planetary gears. As a lubrication structure, for example, a forced lubrication device for planetary gear bearings disclosed in the patent document CN102829165B can be adopted.

[0004] However, in the case of sliding friction between the planetary gear and the planetary pin, it is very difficult for the lubrication method disclosed in the above patent document CN102829165B to supply lubricating oil between the planetary gear and the planetary pin. Therefore, it is very difficult to lubricate between the planetary gear and the planetary pin, resulting in the contact area between the planetary gear and the planetary pin being easily damaged and the service life being reduced. Summary of the Utility Model

[0005] The purpose of this application is to provide a planetary gear lubrication structure and a gear differential that can improve the lubrication effect between the planetary gear and the planetary pin.

[0006] According to this application, a planetary gear lubrication structure is provided, which includes a planetary gear and a planetary pin. The planetary gear is sleeved on the planetary pin. The planetary pin includes: an internal passage that penetrates the planetary pin along the axial direction of the planetary pin, so that the planetary pin is formed into a hollow structure with an inner wall; an oil hole that penetrates the planetary pin along a direction intersecting with the axial direction and connects the gap between the planetary gear and the planetary pin to the internal passage; and a guiding portion that is formed on the inner wall of the planetary pin and connected to the oil hole. The guiding portion can store the lubricating oil entering the hollow structure and guide the lubricating oil to the oil hole.

[0007] In at least one embodiment, the guiding portion has a large-diameter end and a small-diameter end. As going from the small-diameter end towards the large-diameter end, the inner diameter of the guiding portion increases. The oil hole has an internal opening that opens towards the internal passage. In the axial direction, the internal opening straddles the large-diameter end.

[0008] In at least one embodiment, the internal passage includes a large-diameter portion, a small-diameter portion, and an inclined portion serving as the guiding portion. Axially, the large-diameter portion is located in the central region of the internal passage, the small-diameter portions are located in the two side regions of the central region, and the inclined portion connects the large-diameter portion and the small-diameter portions.

[0009] In at least one embodiment, axially, the large-diameter end of the inclined portion is located at the center of the internal opening of the oil hole.

[0010] In at least one embodiment, the oil hole has an internal opening facing the internal passage, and an internal chamfer is formed by expanding the diameter at the internal opening of the oil hole, and the internal chamfer serves as the guiding portion.

[0011] In at least one embodiment, an annular oil storage groove is formed at the oil hole. As the guiding portion, the inner diameter of the oil storage groove is larger than the inner diameter at other positions of the internal passage, and the axial width of the oil storage groove is greater than or equal to the diameter of the oil hole.

[0012] In at least one embodiment, axially, at least two sets of the oil holes are formed, and in the circumferential direction of the planetary pin, each set of the oil holes has four oil holes arranged equidistantly from each other.

[0013] In at least one embodiment, a spiral groove is formed on the inner wall of the planetary gear. Axially, the distance between adjacent two sets of the oil holes is d, and the pitch of the spiral groove is P, satisfying P < d / 2.

[0014] In at least one embodiment, the planetary gear and the planetary pin are in direct contact, and there is no bearing between the planetary gear and the planetary pin.

[0015] According to the present application, there is provided a gear differential including the planetary gear lubrication structure as described above.

[0016] According to the present application, it is possible to provide a planetary gear lubrication structure and a gear differential that improve the lubrication effect between the planetary gear and the planetary pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional schematic view of the planetary gear lubrication structure according to an embodiment of the present application.

[0018] Figure 2 is a cross-sectional schematic view of the planetary pin in the planetary gear lubrication structure according to an embodiment of the present application.

[0019] Figure 3It is a cross-sectional schematic view of a modified example of a planet pin in a planetary gear lubrication structure according to an embodiment of the present application.

[0020] Figure 4 is Figure 3 a cross-sectional schematic view taken along line A-A in

[0021] Figure 5 It is a side view schematic diagram of a planetary gear in a planetary gear lubrication structure according to an embodiment of the present application.

[0022] Figure 6 is Figure 5 a cross-sectional schematic view taken along line B-B in

[0023] Explanation of reference numerals

[0024] 2: Planetary gear; 20: Inner wall of the planetary gear; 21: Spiral groove; 3: Planet pin; 30: Outer wall of the planet pin; 31: Inner wall of the planet pin; 32: Internal passage; 32a: One-side opening; 32b: The other-side opening; 321: Large-diameter part; 322: Small-diameter part; 323: Tapered part; 3231: Large-diameter end; 3232: Small-diameter end; 33: Oil hole; 33a: Internal opening; 33b: External opening; 331: Inner chamfer; X: Axial direction; Y: Radial direction. Detailed implementation manners

[0025] Hereinafter, the detailed implementation manners of the present application will be described with reference to the accompanying drawings. It should be noted that the following embodiments are only used to illustrate the technical solutions of the present application and do not limit the protection scope of the present application. Modifications, improvements, etc. made within the scope of the technical idea of the present application are all within the protection scope of the present application. Moreover, each drawing of the present application is a schematic diagram, and there may be a situation where the size ratio is inconsistent with the actual size ratio.

[0026] In addition, for the sake of convenience of description, as shown in the respective drawings, the axial direction of the planet pin 3 is marked as X, and the radial direction of the planet pin 3 is marked as Y.

[0027] The gear differential of the present application may include parts such as a planetary gear 2, a planet pin 3, a planetary carrier, and a side gear. As Figure 1 shown, the planetary gear 2 is sleeved on the planet pin 3. Specifically, the inner wall 20 of the planetary gear 2 is directly sleeved on the outer wall 30 of the planet pin 3, and there is a small gap between the inner wall 20 of the planetary gear 2 and the outer wall 30 of the planet pin 3. Here, there is no bearing between the planetary gear 2 and the planet pin 3. Other parts other than the planetary gear 2 and the planet pin 3 may adopt appropriate structures in the art, and detailed descriptions thereof are omitted here. Here, the planet pin 3 may be fixedly installed on the planetary carrier by, for example, interference fit. Here, the inner wall refers to the inner surface located on the inner side in the radial direction Y, and the outer wall refers to the outer surface located on the outer side in the radial direction Y.

[0028] When the planetary gear 2 revolves, the planetary gear 2 can be stationary relative to the planetary pin 3. When the planetary gear 2 rotates, the planetary gear 2 can rotate relative to the planetary pin 3. When the planetary gear 2 rotates, a sliding friction is generated between the inner wall 20 of the planetary gear 2 and the outer wall 30 of the planetary pin 3.

[0029] <Planetary gear lubrication structure>

[0030] In an embodiment of the present application, as Figure 1 and Figure 2 shown, the planetary pin 3 extends along the axial direction X and is formed as a hollow cylinder. An internal passage 32 and an oil hole 33 are formed inside the planetary pin 3. The internal passage 32 penetrates the planetary pin 3 along the axial direction X, so that the planetary pin 3 is formed as a hollow structure with an inner wall 31. The oil hole 33 penetrates the planetary pin 3 in a direction intersecting the axial direction X and connects the internal passage 32 with the outside of the planetary pin 3. Thus, the lubricating oil supplied into the internal passage 32 can be guided to the gap between the planetary gear 2 and the planetary pin 3 through the oil hole 33 to lubricate this gap. Preferably, the oil hole 33 penetrates the planetary pin 3 along the radial direction Y perpendicular to the axial direction X. Thus, the lubricating oil can be guided from the internal passage 32 to the gap between the planetary gear 2 and the planetary pin 3 as soon as possible. In addition, the lubricating oil in the present application includes various suitable fluids that can play a lubricating role. In addition, the structure for supplying lubricating oil into the internal passage 32 can adopt a suitable structure in the art, and the detailed description is omitted here.

[0031] As Figure 1 and Figure 2 shown, in an embodiment of the present application, the internal passage 32 includes a large-diameter portion 321, two small-diameter portions 322, and two inclined portions 323. On the axial direction X, the large-diameter portion 321 is located in the central region of the internal passage 32, the two small-diameter portions 322 are respectively located in the two side regions of the central region, and the two inclined portions 323 are respectively located between the two small-diameter portions 322 on both sides and the large-diameter portion 321, connecting the small-diameter portions 322 on both sides with the large-diameter portion 321 respectively. For the inner diameter of the internal passage 32, the inner diameter at the large-diameter portion 321 is larger than that of the small-diameter portion 322, and the inner diameter at the inclined portion 323 is variable.

[0032] The inclined portion 323 has a large-diameter end 3231 located on the side where the large-diameter portion 321 is located and a small-diameter end 3232 located on the side where the small-diameter portion 322 is located. For the inner diameter of the internal passage 32, on the axial direction X, as going from the small-diameter end 3232 towards the large-diameter end 3231, the inner diameter at the inclined portion 323 increases. Here, the inner diameter at the inclined portion 323 can either increase gradually or increase stepwise.

[0033] In the present application, the large-diameter portion 321, the small-diameter portion 322, and the inclined portion 323 can be formed, for example, by machining the internal passage 32 of the planetary pin 3 using a lathe. However, it is not limited thereto, and other appropriate machining methods can also be adopted.

[0034] In addition, in an embodiment of the present application, as Figure 1 and Figure 2 shown, the oil hole 33 has an internal opening 33a formed in the inner wall 31 of the planetary pin 3 and an external opening 33b formed in the outer wall 30 of the planetary pin 3. The internal opening 33a opens toward the internal passage 32, and in the axial direction X, the internal opening 33a straddles the large-diameter end 3231 of the inclined portion 323. Preferably, in the axial direction X, the large-diameter end 3231 of the inclined portion 323 is closer to the inner side than the small-diameter end 3232 and is located at the center of the internal opening 33a of the oil hole 33. Here, the two open ends on the axial X of the internal passage 32 are defined as the outer side, and the central side on the axial X of the internal passage 32 is defined as the inner side. In addition, taking the internal opening 33 as a circular opening as an example, the center of the internal opening 33a refers to the center of the circle. Thus, the lubricating oil in the internal passage 32 can be reliably guided into the oil hole 33 by the inclined portion 323. However, it is not limited thereto, and it can also be set that, in the axial direction X, the internal opening 33a is disposed adjacent to the large-diameter end 3231. Here, "adjacent" includes both the case where the opening edge of the internal opening 22a is tangent to the large-diameter end 3231 and the case where the opening edge of the internal opening 22a is separated from the large-diameter end 3231.

[0035] Preferably, at least two oil holes 33 are formed in the axial direction X, that is, oil holes 33 are respectively formed at the inclined portions 323 on both sides. It can be understood that the "at least two oil holes 33 are formed in the axial direction X" here means that at least two oil holes 33 are offset in the axial direction X, that is, located at different axial positions. Thus, it is possible to cope with planetary gears of different sizes. Specifically, as Figure 2 shown, the distance in the axial direction X between the centers of the internal openings 33a of the two oil holes 33 is set as d. When the size of the planetary gear 2 in the axial direction X is greater than d, the gap between the planetary gear 2 and the planetary pin 3 can be lubricated by the two oil holes 33. When the size of the planetary gear 2 in the axial direction X is less than or equal to d, the gap between the planetary gear 2 and the planetary pin 3 can be lubricated by one oil hole 33.

[0036] As Figure 1 and Figure 2As shown, eight oil holes 33 can be formed in the planetary pin 3 in a double-row four-hole manner, and the internal opening 33a of each oil hole 33 is respectively located at the inclined portion 323. Specifically, in the axial direction X, four oil holes 33 are formed at the inclined portion 323 on one side of the large diameter portion 321, and the four oil holes 33 are arranged at equal intervals from each other in the circumferential direction of the planetary pin 3, and the four oil holes 33 are set as the first row. In addition, four oil holes 33 are formed at the inclined portion 323 on the other side of the large diameter portion 321, and the four oil holes 33 are arranged at equal intervals from each other in the circumferential direction of the planetary pin 3, and the four oil holes 33 are set as the second row. In this way, four oil holes 33 are arranged at equal intervals in the circumferential direction of the planetary pin 3 in the first row and the second row, respectively, so that directional installation is not required during installation, which is convenient for assembly.

[0037] like Figure 2 As shown, when the planetary gear 2 is working, as shown by arrow D1, the lubricating oil enters the internal channel 32 from the opening 32a on one side of the internal channel 32, flows along the inner wall of the internal channel 32 toward the opening 32b on the other side of the internal channel 32, and flows through the small diameter portion 322, the inclined portion 323, and the large diameter portion 321 in sequence. After passing through the large diameter portion 321, at the inclined portion 323 near the opening 32b on the other side, the lubricating oil collides with the inclined portion 323 and changes the flow direction, flows toward the oil hole 33, and then flows into the gap between the planetary gear 2 and the planetary pin 3 to lubricate the gap. In addition, as shown by arrow D2, a part of the lubricating oil can flow directly toward the oil hole 33 along the inclined portion 323.

[0038] Thus, the lubricating oil in the internal passage 32 can be guided into the oil hole 33 by the inclined portion 323 , thereby preventing the lubricating oil from directly passing over the oil hole 33 and flowing out from the other opening 32 b of the internal passage 32 .

[0039] However, the present invention is not limited to this, and other appropriate structures may be used as long as the lubricating oil can be guided into the oil hole 33. For example, as a modified example of the planetary pin 3, the internal channel 32 may include a large diameter portion 321, a small diameter portion 322, and an inclined portion 323, and the planetary pin 34 may be replaced with a structure in which the internal channel 32 includes a large diameter portion 321, a small diameter portion 322, and an inclined portion 323. Figure 3 and Figure 4 The structure shown.

[0040] Specifically, if Figure 3 and Figure 4As shown, the inner diameter of the inner passage 32 can be formed to be constant. The oil hole 33 is formed with an inner opening 33a at the inner wall 31 of the planetary pin 3, and an outer opening 33b is formed at the outer wall 30 of the planetary pin 3. An inner chamfer 331 is formed at the inner opening 33a of the oil hole 33 to enlarge the diameter, that is, at the inner chamfer 331, the inner diameter of the oil hole 33 is increased. In other words, at the inner opening 33a of the oil hole 33, an inclined surface is formed by enlarging the diameter by the inner chamfer 331, and the inclined surface connects the inner wall 31 of the planetary pin 3 with the inner wall of the oil hole 33.

[0041] Therefore, when the planetary gear 2 is working, the lubricating oil enters the internal channel 32 from the opening 32a on one side of the internal channel 32, flows along the inner wall 31 of the planetary pin 3 toward the opening 32b on the other side of the internal channel 32, and flows along the inclined surface formed by the enlarged diameter toward the oil hole 33 when flowing through the inner chamfer 331, and then flows into the gap between the planetary gear 2 and the planetary pin 3 to lubricate the gap. Therefore, it is also possible to prevent the lubricating oil from directly passing over the oil hole 33 and flowing out from the opening 32b on the other side of the internal channel 32.

[0042] In the present application, for example, a ball milling cutter or the like can be used to expand the inner opening 33a of the oil hole 33 to form an inner chamfer 331. During the processing, burrs need to be removed to prevent metal impurities from being mixed in. However, this is not limited to this, and other appropriate processing methods can also be used.

[0043] exist Figure 3 and Figure 4 In the modified example shown, the specific formation position and number of the oil holes 33 can be different from Figure 1 and Figure 2 The structures shown are the same and repeated description is omitted here.

[0044] In addition, it is also possible to provide an oil hole 33 at least at the centrifugal outermost position of the planetary pin 3 in the circumferential direction of the planetary pin 3, thereby making it possible to increase the amount of lubricating oil entering the oil hole 33 by utilizing centrifugal force. Here, the centrifugal outermost position refers to the position on the planetary pin 3 that is farthest from the meshing position of the planetary gear 2 and the sun gear along the radial direction Y.

[0045] Alternatively, it can also be set that, in the circumferential direction of the planetary pin 3, the oil hole 33 is formed at a position other than the above-mentioned meshing position. Thereby, the situation of stress concentration caused by the oil hole 33 can be prevented. In this case, for example, six oil holes 33 can be formed in the planetary pin 3 in a double-row and three-hole manner, and all these six oil holes 33 are formed at positions other than the above-mentioned meshing position. Specifically, for example, it can be set that, in the axial direction X, three oil holes 33 are formed at the inclined portion 323 on one side of the large-diameter portion 312, and these three oil holes 33 are arranged at intervals in the circumferential direction at positions other than the above-mentioned meshing position, and these three oil holes 33 are set as the first row. In addition, three oil holes 33 are formed at the inclined portion 323 on the other side of the large-diameter portion 312, and these three oil holes 33 are arranged at intervals in the circumferential direction at positions other than the above-mentioned meshing position, and these three oil holes 33 are set as the second row.

[0046] In addition, in an embodiment of the present application, as Figure 5 and Figure 6 shown, a spiral groove 21 can also be formed on the inner wall 20 of the planetary gear 2, and the spiral groove 21 can be used to temporarily store lubricating oil. Specifically, when the planetary gear 2 is working, the lubricating oil guided to the gap between the planetary gear 2 and the planetary pin 3 can be temporarily stored in the spiral groove 21. As the planetary gear 2 rotates, the lubricating oil is brought to the gap by the spiral groove 21. Thereby, the range of diffusion of the lubricating oil in the gap between the planetary gear 2 and the planetary pin 3 can be increased, and the lubrication effect can be improved.

[0047] As Figure 1 、 Figure 5 and Figure 6 shown, two sets of the above-mentioned oil holes 33 are formed in the axial direction X, and a spiral groove 21 is formed on the inner wall 20 of the planetary gear 2. The pitch of the spiral groove 21 is set as P, and the distance in the axial direction X between the centers of the inner openings 33a of the two sets of oil holes 33 is set as d (refer to Figure 2 and Figure 3 ), and P < d / 2 is satisfied. Here, as Figure 6 shown, the pitch P refers to the distance in the axial direction X between the center lines of adjacent spiral grooves 21. In this way, in the axial direction X, it can be ensured that there are at least two spiral grooves 21 between two oil holes 33. Since two sets of oil holes 33 are formed in the axial direction X, the spiral direction of the spiral groove 21 does not need to be limited. No matter in which direction the planetary gear 2 rotates, the lubricating oil will be brought to the gap between the planetary gear 2 and the planetary pin 3 by the spiral groove 21. Thereby, the range of diffusion of the lubricating oil can be increased, and the lubrication effect can be improved.

[0048] <Function and effect>

[0049] In the present application, as described above, as a guiding portion for guiding lubricating oil into the oil hole 33, an inclined portion 323 or an internal chamfer 331 is provided. The guiding portion can store the lubricating oil entering the internal passage 32 and guide the lubricating oil to the oil hole 33. Thereby, the situation where the lubricating oil directly flows away from the other opening 32b of the internal passage 32 across the oil hole 33 can be prevented. The lubricating oil can be reliably guided into the oil hole 33, and further guided into the gap between the planetary gear 2 and the planetary pin 3, so as to sufficiently lubricate between the planetary gear 2 and the planetary pin 3. In addition, for the inner wall 20 of the planetary gear 2 and the outer wall 30 of the planetary pin 3, ordinary coatings can be used, which can reduce costs.

[0050] In addition, in the present application, as described above, in the case where the inclined portion 323 is provided, in the axial direction X, the large-diameter end 3231 of the inclined portion 323 is closer to the inside than the small-diameter end 3232 and is located at the center of the internal opening 33a of the oil hole 33. Thereby, the lubricating oil in the internal passage 32 can be reliably guided into the oil hole 33 by the inclined portion 323.

[0051] In addition, in the present application, as described above, eight oil holes 33 are formed in the planetary pin 3 in a double-row and four-hole manner. Thereby, the lubrication effect can be further improved, and it is not necessary to install in a specific orientation during installation, which is convenient for assembly.

[0052] In addition, in the present application, as described above, it can be set that spiral grooves 21 are formed on the inner wall 20 of the planetary gear 2, and the spiral grooves 21 can be used to temporarily store lubricating oil. Preferably, at least two sets of the above-mentioned oil holes 33 are formed in the axial direction X, and spiral grooves 21 are formed on the inner wall 20 of the planetary gear 2. The pitch of the spiral grooves 21 is set as P, and the axial distance on the X-axis between the centers of the internal openings 33a of two adjacent sets of oil holes 33 is set as d, and P < d / 2. Thereby, the lubrication effect can be further improved.

[0053] The present application is not limited to the above embodiments, and various changes and modifications can be made within the scope of the technical idea of the present application. Of course, such changes and modifications are all within the protection scope of the present application.

[0054] For example, in a variant example, an annular oil storage groove can be formed at the oil hole 33 as an oil storage portion or a guiding portion. The inner diameter of the oil storage groove is larger than the inner diameter of other positions of the internal passage 32. The axial width of the oil storage groove on the X-axis can be greater than or equal to the diameter of the oil hole 33. For example, on the axial direction X, the oil hole 33 can be completely located within the oil storage groove.

[0055] In another variant example, Figure 1 and Figure 2The inclined portion 323 therein forms a step (or shoulder) between the large-diameter portion 321 and the small-diameter portion 322, and the oil hole 33 can be located in the large-diameter portion 321 and be arranged close to the small-diameter portion.

[0056] In yet another variant, a spiral groove or other form of oil guiding groove can be formed on the outer wall of the planet pin 3. Considering that the planet pin 3 is usually fixedly installed relative to the planet carrier and thus appears relatively stationary, forming the spiral groove or other form of oil guiding groove on the inner wall of the planet gear is more conducive to the dispersion of lubricating oil. Additionally, from the perspective of structural strength, it is also more beneficial to form the spiral groove or other form of oil guiding groove on the inner wall of the planet gear, especially for small gear structures.

[0057] According to the present application, a planetary gear lubrication structure and a gear differential that can improve the lubrication effect between the planetary gear and the planet pin can be provided.

[0058] Of course, the gear lubrication structure of the present application can also be applied to other fields or occasions. For example, it can be used for the lubrication of the planetary gears of a transmission mechanism. Here, the transmission mechanism and the vehicle power system can be the subject matter of the present application, and the transmission mechanism or the vehicle power system can include the above-mentioned planetary gear lubrication structure or gear differential.

Claims

1. A planetary gear lubrication structure, characterized in that: It includes a planetary gear and a planetary pin, wherein the planetary gear is sleeved on the planetary pin. The planetary pin comprises: An internal channel, which penetrates the planetary pin along the axial direction of the planetary pin, so that the planetary pin is formed into a hollow structure with an inner wall; an oil hole that penetrates the planetary pin in a direction intersecting the axial direction and connects a gap between the planetary gear and the planetary pin with the internal passage; and A guide portion is formed at the inner wall of the planetary pin and connected to the oil hole, the guide portion being capable of storing lubricating oil entering the hollow structure and guiding the lubricating oil to the oil hole.

2. The planetary gear lubrication structure according to claim 1, characterized in that: The guide portion has a large diameter end and a small diameter end, and the inner diameter of the guide portion increases as it goes from the small diameter end toward the large diameter end. The oil hole has an inner opening that opens toward the inner passage, and in the axial direction, the inner opening spans the large-diameter end.

3. The planetary gear lubrication structure according to claim 2, characterized in that: The internal passage includes a large diameter portion, a small diameter portion, and an inclined portion as the guide portion. In the axial direction, the large diameter portion is located in a central region of the internal passage, the small diameter portion is located in regions on both sides of the central region, and the inclined portion connects the large diameter portion and the small diameter portion.

4. The planetary gear lubrication structure according to claim 3, characterized in that: In the axial direction, the large diameter end of the inclined portion is located at the center of the inner opening of the oil hole.

5. The planetary gear lubrication structure according to claim 1, characterized in that: The oil hole has an inner opening that opens toward the inner passage, and an inner chamfer is formed at the inner opening of the oil hole to expand its diameter, and the inner chamfer serves as the guide portion.

6. The planetary gear lubrication structure according to claim 1, characterized in that: An annular oil storage groove is formed at the oil hole as the guide portion, the inner diameter of the oil storage groove is larger than the inner diameter of other positions of the internal channel, and the axial width of the oil storage groove is larger than or equal to the diameter of the oil hole.

7. The planetary gear lubrication structure according to claim 1, characterized in that: In the axial direction, at least two groups of oil holes are formed. In the circumferential direction of the planetary pin, each group of the oil holes has four oil holes arranged at equal intervals from each other.

8. The planetary gear lubrication structure according to claim 7, characterized in that: A spiral groove is formed on the inner wall of the planetary gear. In the axial direction, the distance between two adjacent groups of oil holes is d, and the pitch of the spiral groove is P, satisfying P <d / 2。 9. The planetary gear lubrication structure according to claim 1, characterized in that: The planetary gears are in direct contact with the planetary pins, and there is no bearing between the planetary gears and the planetary pins.

10. A gear differential, characterized in that: The invention comprises the planetary gear lubrication structure according to any one of claims 1 to 9.

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