Planet row lubricating structure

Abstract

The planet row lubricating structure comprises a shaft body, the shaft body is sleeved with a planet carrier, a planet shaft is installed in the planet carrier, and a planet wheel is installed on the planet shaft through a rolling bearing. The planet carrier is characterized in that one end of the planet carrier is in non-contact fit with the shaft body, and an oil storage groove is defined by the end and the outer edge of the shaft body; an annular oil collecting groove is formed in the end, close to one side of the oil storage groove, of the planet carrier. The annular oil collecting groove comprises a sectional type variable-diameter inner hole. An oil duct is arranged in the planetary shaft, is inclined from one end of the annular oil collecting groove to the planetary gear, penetrates through the interior of the planetary shaft, is communicated with the annular oil collecting groove and extends to the rolling bearing; the rolling bearing is provided with a groove-shaped structure so that lubricating oil can pass through the groove-shaped structure conveniently. The planet row lubricating structure is compact in overall structure, capable of coexisting with various lubricating modes, high in universality and high in reliability.

Description

Technical Field

[0001] The utility model relates to a planetary gear set lubrication structure, belonging to the technical field of planetary gear sets. Background Art

[0002] A planetary gear transmission is composed of a planetary gear mechanism and actuators such as clutches, brakes, and one-way clutches. The planetary gear mechanism usually consists of several rows of planets. The lubrication method of a planetary gear reducer is one of the important measures to ensure its normal operation. The purpose of lubrication is to reduce friction, reduce wear, increase service life, and play roles of cooling, cleaning, and vibration damping.

[0003] After retrieval, CN203686088U discloses a novel planetary gear set. The planetary gear shaft of this planetary gear set is connected to two arms of the planet carrier; the planet carrier and the planetary gear shaft are axially positioned by retaining rings; the planetary gears are arranged on the planetary gear shafts and meshed with needle roller bearings; a spacer sleeve is provided between the planetary gears and the planetary gear shafts; a gasket is provided between the planet carrier and the planetary gear shafts. The planet carrier and the planetary gear shaft are axially positioned by retaining rings, which can prevent the defect of easy loosening when using screw positioning, and the positioning is reliable and safe; the planetary gear shaft adopts a stepped shaft, which can prevent the planet carrier from scratching the surface of the planetary gear shaft; lubrication grooves are opened on the end faces of the planetary gears, and oil passage holes are drilled in the inner holes, which is beneficial to the lubrication of the planetary gear bearings and increases the bearing life. However, the lubrication structure of this type of planetary gear set is relatively simple and cannot be applied to the use of a novel transmission. And the existing structure cannot fully lubricate the planetary gear bearings by gear splash, and it is necessary to design an active lubrication structure like this to solve the lubrication problem. Summary of the Utility Model

[0004] Aiming at the above deficiencies of the prior art, the utility model provides a planetary gear set lubrication structure, which reasonably arranges a shaft body, a planet carrier, planetary gears, planetary shafts, etc. An oil passage is arranged inside the planetary shaft, and an annular oil collecting groove is arranged on the planet carrier to collect oil. Then, by the centrifugal force generated by the rotation of the planet carrier, the lubricating oil is pressed into the oil passage, and then flows to the planetary gear copper gasket through the gap between the planetary gear and the rolling bearing; then it flows to the planetary gear gasket through the oil groove on the inner hole of the planetary gear copper gasket, and then flows out through the oil groove on the end face of the planetary gear gasket, forming a lubrication circuit. This structure is simple and effective, easy to implement, and can also be used in combination with other lubrication methods.

[0005] The technical means adopted by the utility model to solve the above problems are as follows:

[0006] Disclosed is a lubrication structure for a planetary gear set, including a shaft body. A planet carrier is sleeved outside the shaft body. A planet shaft is installed inside the planet carrier, and a planet gear is installed on the planet shaft through a rolling bearing. One end of the planet carrier is in non-contact fit with the shaft body, and an oil storage groove is formed by enclosing the outer edge of the shaft body. An annular oil collecting groove is provided at the end of the planet carrier close to the oil storage groove side, and the annular oil collecting groove includes a segmented variable-diameter inner hole. An oil passage is provided inside the planet shaft. The oil passage is obliquely arranged from one end of the annular oil collecting groove towards the planet gear direction and penetrates through the inside of the planet shaft. The oil passage is communicated with the annular oil collecting groove and extends towards the rolling bearing direction. The rolling bearing is provided with a groove-shaped structure to facilitate the passage of lubricating oil.

[0007] Further, the annular oil collecting groove includes an inlet end and an outlet end, and the inner diameters of the inlet end and the outlet end are different. The inner diameter of the inlet end is larger than that of the outlet end.

[0008] Further, the opening of the inlet end faces the shaft body. The inlet end is a segmented variable-diameter inner hole, and the inner diameter gradually becomes smaller from the shaft body side towards the planet shaft side.

[0009] Further, the oil passage includes an oil passage inlet and an oil passage outlet. The oil passage inlet abuts against the outlet end of the annular oil collecting groove. The inner diameter of the oil passage inlet is greater than or equal to that of the outlet end.

[0010] Further, the planet gear is in clearance fit with the rolling bearing. The oil passage outlet is communicated with the groove-shaped structure, and the groove-shaped structure is arranged at the middle position of the planet gear.

[0011] Further, a copper gasket for the planet gear is arranged between the planet gear and the planet carrier. The copper gasket for the planet gear is an annular gasket. One end of the copper gasket for the planet gear is attached to the end face of the planet gear. The copper gasket for the planet gear is in clearance fit with the planet shaft.

[0012] Further, the copper gasket for the planet gear includes a first inner hole. Oil grooves are arranged on both end faces of the copper gasket for the planet gear. The oil grooves are arc-shaped grooves extending outward from the inner wall of the first inner hole.

[0013] Further, a planet gear gasket is attached to the other end of the copper gasket for the planet gear, and the planet gear gasket abuts against the planet shaft.

[0014] Further, the planet gear gasket includes a second inner hole. An oil groove is arranged on the second inner hole and extends from the second inner hole towards the outer edge. The oil groove is an arc-shaped groove concave from the surface of the planet gear gasket.

[0015] Further, the arc-shaped groove is two strip-shaped groove bodies arranged in parallel and penetrating through the end face of the planet gear gasket. The arc-shaped grooves arranged at both end faces of the planet gear gasket are perpendicular to each other.

[0016] Further, the planetary shaft is positioned on the planet carrier through an elastic pin to restrict the rotation and removal of the planetary shaft.

[0017] The beneficial effects of the present utility model compared with the prior art are as follows:

[0018] The planetary gear set lubrication structure provided by the present utility model uses the annular oil collecting groove provided on the planet carrier to collect oil, and then uses the centrifugal force generated by the rotation of the planet carrier to press the lubricating oil into the oil passage, and then flows through the gap between the planetary gear and the rolling bearing to the copper gasket of the planetary gear; then flows through the oil groove on the inner hole of the copper gasket of the planetary gear to the planetary gear gasket, and then flows out through the oil groove on the end face of the planetary gear gasket to form a lubrication circuit.

[0019] The overall structure of the planetary gear set lubrication structure of the present utility model is compact, can coexist with various lubrication methods, has strong versatility and high reliability. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the planetary gear set lubrication structure of the present utility model.

[0021] Figure 2 is a front view of the planetary gear gasket of the planetary gear set lubrication structure of the present utility model.

[0022] Figure 3 is a side view of the planetary gear gasket of the planetary gear set lubrication structure of the present utility model.

[0023] Figure 4 is a front view of the copper gasket of the planetary gear of the planetary gear set lubrication structure of the present utility model.

[0024] Wherein, 1. shaft body, 2. planet carrier, 21. annular oil collecting groove, 211. inlet end, 212. outlet end, 3. planetary shaft, 31. oil passage, 311. oil passage inlet, 312. oil passage outlet, 4. planetary gear gasket, 41. second inner hole, 42. second oil groove, 5. copper gasket of planetary gear, 51. first inner hole, 52. first oil groove, 6. rolling bearing, 61. groove-shaped structure, 7. planetary gear, 8. elastic pin, 100. oil storage groove. Detailed Embodiments

[0025] The present utility model will be further described below with reference to the drawings. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. Embodiment 1

[0026] As Figure 1As shown, the planetary gear lubrication structure of this embodiment includes a shaft body 1, which is the center of the entire structure; a planet carrier 2 is provided on the shaft body 1, and the planet carrier 2 serves as the skeleton of the entire structure, integrating multiple structures into one. A planet shaft 3 is installed inside the planet carrier 2, and a planetary gear 7 is installed on the planet shaft 3 through a rolling bearing 6. One end of the planet carrier 2 is non-contactly matched with the shaft body 1, and is enclosed with the outer edge of the shaft body 1 to form an oil storage tank 100. An annular oil collecting groove 21 is provided at the end of the planetary carrier 2 near the oil storage tank 100, and the annular oil collecting groove 21 includes a segmented variable diameter inner hole; an oil channel 31 is provided inside the planetary shaft 3, and the oil channel 31 is inclined from one end of the annular oil collecting groove 21 toward the planetary gear 7 and runs through the inside of the planetary shaft 3, and the oil channel 31 is connected with the annular oil collecting groove 21 and extends toward the rolling bearing 6; the angle between the central axis of the oil channel 31 and the central axis of the shaft body 1 is 40°~60°, and the preferred angle in this embodiment is 45°; the rolling bearing 6 is provided with a groove structure 61, the planetary gear 7 and the rolling bearing 6 are clearance-matched, the oil channel outlet 312 is connected with the groove structure 61, and the groove structure 61 is arranged in the middle position of the planetary gear 7.

[0027] A planetary gear copper gasket 5 is provided between the planetary gear 7 and the planetary carrier 2. The planetary gear copper gasket 5 is an annular gasket. One end of the planetary gear copper gasket 5 is attached to the end face of the planetary gear 7. The planetary gear copper gasket 5 is in clearance with the planetary shaft 3. The other end of the planetary gear copper gasket 5 is attached to the planetary gear gasket 4, which is in contact with the planetary shaft 3. The planetary shaft 3 is positioned on the planetary carrier 2 by the elastic pin 8 to limit the rotation and escape of the planetary shaft 3. This structure uses the annular oil collecting groove 21 provided on the planetary carrier 2 to collect oil, and then the centrifugal force generated by the rotation of the planetary carrier 2 presses the lubricating oil into the oil channel 31, and then flows to the planetary gear copper gasket 5 through the gap between the planetary gear 7 and the rolling bearing 6; then flows to the planetary gear gasket 4 through the oil groove on the inner hole of the planetary gear copper gasket 5, and then flows out through the oil groove on the end face of the planetary gear gasket 4 to form a lubrication circuit.

[0028] The specific embodiment of the present invention is as follows: the annular oil collecting tank 21 is provided with an inlet end 211 and an outlet end 212, the inner diameters of the inlet end 211 and the outlet end 212 are different, and the inner diameter of the inlet end 211 is larger than the inner diameter of the outlet end 212. This design can effectively press the lubricating oil in the oil storage tank 100 into the oil passage 31 through the centrifugal force generated by the rotation of the planetary carrier 2. The opening of the inlet end 211 faces the shaft body 1, and the inner diameter of the inlet end 211 gradually decreases from the side of the shaft body 1 to the side of the planetary shaft 3. The structure of the entire annular oil collecting tank 21 plays a guiding and drainage role. The inlet end 211 at the bottom has a large opening and a smaller inner diameter, which can make it easier for the lubricating oil to enter from the side of the shaft body 1 to the side of the planetary shaft 3.

[0029] Moreover, the oil passage 31 is provided with an oil passage inlet 311 and an oil passage outlet 312. The oil passage inlet 311 abuts against the outlet end 212 of the annular oil collecting groove 21; the inner diameter of the oil passage inlet 311 is greater than or equal to the inner diameter of the outlet end 212. This design can effectively transfer the lubricating oil from the annular oil collecting groove 21 to the oil passage 31.

[0030] As Figure 2 and Figure 3 shown, the planetary gear copper gasket 5 in this embodiment includes a first inner hole 51. Oil grooves 52 are provided on both end faces of the planetary gear copper gasket 5. The oil grooves 52 are arc-shaped grooves 52 extending outward from the inner wall of the first inner hole 51. That is, arc-shaped grooves 52 for expanding the inner hole are evenly distributed in the circumferential direction of the inner hole. Four evenly distributed oil grooves 52 are provided on the inner hole of the planetary gear copper gasket 5. The lubricating oil in the gap between the planetary gear 7 and the rolling bearing 6 flows to the planetary gear gasket 4 through the four oil grooves 52 in the inner hole of the planetary gear copper gasket 5, so that the lubricating oil can more easily pass through the inside of the planetary gear copper gasket 5.

[0031] The planetary gear gasket 4 in this embodiment includes a second inner hole 41. Oil grooves 42 extending from the second inner hole 41 to the outer edge are provided on the second inner hole 41. The oil grooves 42 are arc-shaped grooves 42 concave from the surface of the planetary gear gasket 4. Oil grooves 42 are provided on both end faces of the planetary gear gasket 4. The arc-shaped grooves 42 are two strip-shaped grooves parallel to each other and penetrating through the end face of the planetary gear gasket 4; the arc-shaped grooves 42 disposed on the two end faces of the planetary gear gasket 4 are perpendicular to each other. The width of a single arc-shaped groove 42 is preferably 1 / 10 - 1 / 8 of the diameter length of the entire planetary gear gasket 4, which not only ensures the use strength and reliability of the entire planetary gear gasket 4, but also enables the lubricating oil to smoothly pass through the oil grooves 42. Setting the arc-shaped grooves 42 on the two end faces of the planetary gear gasket 4 perpendicular to each other is beneficial to guiding the lubricating oil in multiple directions, making the entire lubricating oil path have good circulation performance, improving the lubrication performance of the entire planetary gear lubrication structure, and prolonging the bearing life.

[0032] The above are only the embodiments of the present invention. The present invention is not limited to the fields involved in this embodiment. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the content of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A planetary gear lubrication structure, comprising a shaft body (1), a planet carrier (2) being provided on the shaft body (1), a planet shaft (3) being installed inside the planet carrier (2), and a planet wheel (7) being installed on the planet shaft (3) via a rolling bearing (6); characterized in that: One end portion of the planet carrier (2) is in non-contact engagement with the shaft body (1) and is enclosed with the outer edge of the shaft body (1) to form an oil storage tank (100); An annular oil collecting groove (21) is provided at the end of the planet carrier (2) near the oil storage groove (100), and the annular oil collecting groove (21) comprises a segmented variable diameter inner hole; an oil passage (31) is provided inside the planet shaft (3), and the oil passage (31) is inclined from one end of the annular oil collecting groove (21) toward the planetary gear (7) and penetrates the inside of the planet shaft (3); the oil passage (31) is connected to the annular oil collecting groove (21) and extends toward the rolling bearing (6); The rolling bearing (6) is provided with a groove structure (61) to facilitate the passage of lubricating oil.

2. The planetary gear lubrication structure according to claim 1, characterized in that: The annular oil collecting groove (21) comprises an inlet end (211) and an outlet end (212); the inlet end (211) and the outlet end (212) have different inner diameters; the inner diameter of the inlet end (211) is greater than the inner diameter of the outlet end (212).

3. The planetary gear lubrication structure according to claim 2, characterized in that: The opening of the inlet end (211) faces the shaft body (1), and the inner diameter of the inlet end (211) gradually decreases from one side of the shaft body (1) to one side of the planetary shaft (3).

4. The planetary gear lubrication structure according to claim 3, characterized in that: The oil channel (31) comprises an oil channel inlet (311) and an oil channel outlet (312); the oil channel inlet (311) abuts against the outlet end (212) of the annular oil collecting groove (21); the inner diameter of the oil channel inlet (311) is greater than or equal to the inner diameter of the outlet end (212).

5. The planetary gear lubrication structure according to claim 4, characterized in that: The planetary gear (7) and the rolling bearing (6) are clearance-matched, the oil channel outlet (312) is in communication with the groove-shaped structure (61), and the groove-shaped structure (61) is arranged in the middle of the planetary gear (7).

6. The planetary gear lubrication structure according to any one of claims 1 to 5, characterized in that: A planetary gear copper gasket (5) is provided between the planetary gear (7) and the planetary carrier (2), and the planetary gear copper gasket (5) is an annular gasket; one end of the planetary gear copper gasket (5) is fitted on the end face of the planetary gear (7); and the planetary gear copper gasket (5) is clearance-matched with the planetary shaft (3).

7. The planetary gear lubrication structure according to claim 6, characterized in that: The planetary gear copper gasket (5) comprises an inner hole (51), and oil grooves (52) are arranged on both end surfaces of the planetary gear copper gasket (5), wherein the oil grooves (52) are arc-shaped grooves that expand outward from the inner wall of the inner hole (51).

8. The planetary gear lubrication structure according to claim 7, characterized in that: The other end of the planetary gear copper gasket (5) is bonded with a planetary gear gasket (4), and the planetary gear gasket (4) abuts against the planetary shaft (3).

9. The planetary gear lubrication structure according to claim 8, characterized in that: The planetary wheel gasket (4) comprises a second inner hole (41), and a second oil groove (42) extending from the second inner hole (41) to the outer edge is provided on the second inner hole (41), and the second oil groove (42) is an arc-shaped groove concave in the surface of the planetary wheel gasket (4).

10. The planetary gear lubrication structure according to claim 9, characterized in that: The arc grooves 2 are two parallel strip-shaped groove bodies that penetrate the end surface of the planetary gear gasket (4); the arc grooves 2 disposed on the end surfaces at both ends of the planetary gear gasket (4) are disposed perpendicular to each other.

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