Planetary gear mechanism and differential

Abstract

A planetary gear mechanism, comprising a planetary gear (2), a planetary gear carrier (1), and a spacer (3) provided between the planetary gear and the planetary gear carrier, wherein the planetary gear carrier is provided with a recessed portion (11) extending in the radial direction (R) of the planetary gear carrier, the spacer is a ring-shaped sheet, one side surface (33) of the spacer is provided with an oil guide groove (31), the oil guide groove faces the planetary gear and extends in the radial direction, the oil guide groove enables a radial inner side and a radial outer side of the spacer to be communicated, the oil guide groove can accommodate oil or allow oil to pass through, the other side surface (34) of the spacer is provided with a protruding portion (32), and the protruding portion is embedded in the recessed portion, so that the spacer cannot rotate relative to the planetary gear carrier. Further disclosed is a differential. A good lubricating effect can be achieved by means of the oil guide groove capable of accommodating oil, and the spacer is prevented from rotating by means of the cooperation of the protruding portion and the recessed portion, thereby reducing the wear of the planetary gear carrier.

Description

Planetary gear mechanism and differential TECHNICAL FIELD

[0001] The present application relates to the field of planetary gear transmission, in particular to a planetary gear mechanism and a differential. BACKGROUND

[0002] In the planetary gear mechanism, the planetary gears can be rotatably connected to the planetary gear carrier through a pin shaft, and the pin shaft can support the planetary gears through a needle bearing.

[0003] When the planetary gear mechanism is working, the relative rotation speed of the planetary gears and the planetary gear carrier is high, and the planetary gear carrier is usually made of cast iron. The cast iron material is relatively soft and has low hardness, which causes the planetary gear carrier to be easily worn.

[0004] In one possible technical solution, a flat gasket is arranged between the planetary gears and the planetary gear carrier to reduce the wear of the planetary gear carrier. However, in actual use, the planetary gears can cause the gasket to rotate relative to the planetary gear carrier, which means that the flat gasket has very low reliability in resisting relative rotation and can still cause wear of the planetary gear carrier.

[0005] Patent CN202349109U discloses a planetary retainer assembly, which uses the structure of two flat gaskets to reduce the probability of relative rotation between the planetary gears and the planetary gear carrier. However, the two flat gaskets increase the cost and neither has the anti-rotation function, and the reliability of resisting relative rotation is very low. In addition, the two flat gaskets also increase the axial space.

[0006] Patent CN208331171U discloses a differential assembly with a planetary gear gasket anti-rotation structure, and patent CN204300241U discloses a wheel edge speed reducer assembly with a planetary gear gasket anti-rotation structure, which achieves the anti-rotation effect through a protruding structure. However, the protrusion of the gasket can only be manually aligned and installed, and is only suitable for installation of an open mechanism, that is, the gasket, gear, bearing and other components need to be sequentially installed in the axial direction, so that the structure is not easy to realize batch assembly production. In addition, the gasket has no promoting effect on lubrication.

[0007] SUMMARY

[0008] Therefore, the present application aims to provide a planetary gear mechanism to reduce the wear of the planetary gear carrier.

[0009] The embodiments of the present application provide a planetary gear mechanism, which comprises a planetary gear, a planetary gear carrier and a gasket arranged between the planetary gear and the planetary gear carrier, wherein the gasket is arranged in a recess of the planetary gear carrier.

[0010] The planetary gear carrier is provided with a recess extending in the radial direction thereof,

[0011] The gasket is annular and has an oil guide groove on one side thereof, the oil guide groove faces the planetary gear and extends in the radial direction, the oil guide groove communicates the radial inner side and the radial outer side of the gasket, and the oil guide groove can contain oil or allow oil to pass through,

[0012] The other side of the gasket is provided with a protrusion, the protrusion is embedded in the recess, and the gasket cannot rotate relative to the planetary gear carrier.

[0013] In at least one possible implementation, the oil guide groove and the protrusion are formed on opposite sides of the same position of the gasket.

[0014] In at least one possible implementation, the gasket is provided with two oil guide grooves, the two oil guide grooves are oppositely arranged and aligned in a straight line.

[0015] In at least one possible implementation, the gasket is provided with a wear-resistant coating only on the one side.

[0016] In at least one possible implementation, the inner circumferential surface of the gasket is a complete circle without concave-convex structures.

[0017] In at least one possible implementation, the outer circumferential portion of the planetary gear carrier has a plurality of openings, and the gasket and the planetary gear are loaded into the planetary gear carrier from the openings in the radial direction.

[0018] In at least one possible implementation, only one gasket is arranged between the axial side of one planetary gear and the planetary gear carrier.

[0019] In at least one possible implementation, the planetary gear has a movement space in the axial direction thereof, and the depth of the recess in the axial direction is greater than or equal to the movement space of the planetary gear in the axial direction.

[0020] In at least one possible implementation, the depth of the recess in the axial direction of the planetary gear carrier is greater than or equal to the height of the protrusion protruding from the other side, and / or

[0021] The width of the recess is greater than or equal to the width of the protrusion.

[0022] The embodiments of the present application also propose a differential mechanism comprising the planetary gear mechanism according to any one of the above technical solutions.

[0023] The oil guide groove capable of containing oil can achieve better lubrication effect, and the cooperation of the protrusion and the recess prevents the gasket from rotating, thereby reducing the wear of the planetary gear carrier.

[0024] Other features and aspects of the present application will become apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and together with the description, serve to explain the principles of the application.

[0026] FIG. 1 illustrates a partial structural schematic view of a planetary gear mechanism according to an embodiment of the present application.

[0027] FIG. 2 illustrates a partial structural schematic view of a planetary gear mechanism according to an embodiment of the present application.

[0028] FIG. 3 illustrates a partial structural schematic view of a planetary gear carrier of a planetary gear mechanism according to an embodiment of the present application.

[0029] FIG. 4 illustrates an enlarged front view of a planetary gear carrier of a planetary gear mechanism according to an embodiment of the present application.

[0030] FIG. 5 illustrates a partial cross-sectional view of a planetary gear mechanism according to an embodiment of the present application.

[0031] FIG. 6 illustrates a structural schematic view of a gasket of a planetary gear mechanism according to an embodiment of the present application.

[0032] FIG. 7 illustrates a structural schematic view of a gasket of a planetary gear mechanism according to an embodiment of the present application.

[0033] FIG. 8 illustrates a side view of a gasket of a planetary gear mechanism according to an embodiment of the present application.

[0034] LIST OF REFERENCE NUMERALS 1 planetary gear carrier 11 recess 12 planetary gear carrier gasket mating surface 13 gear shaft mounting hole 2 planetary gear 3 gasket 31 oil guide groove 32 protrusion 33 one side surface 34 other side surface DETAILED DESCRIPTION

[0035] Exemplary embodiments, features and aspects of the present application will be explained in detail below with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements or elements having a similar function. Although aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted.

[0036] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0037] In addition, for a better understanding of the present application, numerous specific details are given in the following detailed description. The person skilled in the art will understand that the present application can also be implemented without certain specific details. In other instances, methods, means, elements and circuits, which are well known to the person skilled in the art, are not described in detail in order to emphasize the subject matter of the present application.

[0038] As shown in Figs. 1 to 8, embodiments of the present application propose a planetary gear mechanism, which can be a differential or a part of a differential, for example. The planetary gear mechanism can include a sun gear, a planet carrier 1, a planet gear 2, and a spacer 3.

[0039] A plurality of planet gears 2 can be rotatably connected to the planet carrier 1 by gear shafts, the plurality of planet gears 2 being engaged with the sun gear. The spacer 3 can be provided between the planet gear 2 and the planet carrier 1, only one spacer 3 being provided between one planet gear 2 and the planet carrier 1 on one axial side of the planet gear 2. The sun gear can also be replaced by or represented as two half-axle gears.

[0040] As shown in Figs. 1 to 5, the planet carrier 1 can be provided with a plurality of gear shaft mounting holes 13 into which gear shafts can be inserted to mount the planet gears 2 to the planet carrier 1.

[0041] An axial side of the planet carrier 1 can be provided with a planet carrier spacer mating surface 12, which can be ring-shaped, the planet carrier spacer mating surface 12 surrounding the gear shaft mounting holes 13. The planet carrier spacer mating surface 12 can protrude from a main body portion of the planet carrier 1.

[0042] The planet carrier spacer mating surface 12 can be in contact with the spacer 3 to position the spacer 3. The planet carrier spacer mating surface 12 can be formed by finish machining, such as milling, to have a high flatness.

[0043] The planet carrier 1 can be provided with a recess 11 recessed with respect to the planet carrier spacer mating surface 12, the recess 11 being recessed from the planet carrier spacer mating surface 12 to an axial outer side of the planet carrier 1 (the side away from the axial center position of the planet carrier 1). The recess 11 is shaped to cooperate with a protrusion 32 of the spacer 3, the protrusion 32 of the spacer 3 being able to be fitted into the recess 11 to prevent the spacer 3 from rotating with respect to the planet carrier 1.

[0044] The mating precision of the recess 11 and the gasket 3 is low, the recess 11 can be directly formed by casting, without a finishing step such as milling, and the provision of the recess 11 does not increase the process steps and manufacturing cost of the planetary gear carrier 1. Of course, the recess 11 can be formed by a finishing step such as milling, or the recess 11 can be further processed by a finishing step such as milling on the basis of casting, which is still a solution disclosed in the present application.

[0045] The outer peripheral portion of the planetary gear carrier 1 has a plurality of openings, and the gasket 3 and the planetary gears 2 are fitted into the planetary gear carrier 1 from the openings in the radial direction R.

[0046] As shown in FIGS. 5 to 8, the gasket 3 can be a ring-shaped sheet.

[0047] One side surface 33 of the gasket 3 can be provided with an oil guide groove 31, and the other side surface 34 of the gasket 3 can be provided with a protrusion 32. Here, the one side surface 33 of the gasket 3 can be the axially inner side surface of the gasket 3, i.e., the side surface facing the planetary gears 2, and thus the oil guide groove 31 is toward the side where the planetary gears 2 are located. The oil guide groove 31 can extend in the radial direction of the gasket 3, and the oil guide groove 31 can communicate the radially inner side and the radially outer side of the gasket 3, and can accommodate oil. The oil accommodated in the oil guide groove 31 or flowing through the oil guide groove 31 is between the gasket 3 and the planetary gears 2, and can lubricate the friction position of the gasket 3 and the planetary gears 2, thereby reducing wear.

[0048] The oil guide groove 31 can guide the oil to flow more through the gasket 3 and the planetary gears 2, and less through the planetary gear carrier 1 and the gasket 3, thereby better utilizing the oil to lubricate the friction between the gasket 3 and the planetary gears 2.

[0049] Further, the inner peripheral surface and the outer peripheral surface of the gasket 3 are both complete, circular without concave-convex structures, i.e., the gasket 3 can be a circular ring-shaped sheet. The gasket 3 can be sleeved on the gear shaft, the inner peripheral surface of the gasket 3 can be gap-fitted with the gear shaft, and the oil can pass through the gap between the gasket 3 and the gear shaft.

[0050] Further, as shown in FIGS. 4 and 8, the depth H2 of the recess 11 in the axial direction A of the planetary gear carrier 1 can be greater than or equal to the height H1 by which the protrusion 32 of the gasket 3 protrudes from the other side surface 34 of the gasket 3. The width W2 of the recess 11 can be greater than or equal to the width W1 of the protrusion 32 of the gasket 3. The protrusion 32 can be completely embedded in the recess 11, so that the other side surface 34 of the gasket 3 contacts the gasket mating surface 12 of the planetary gear carrier, and the flatness of the gasket mating surface 12 of the planetary gear carrier is high, which is conducive to improving the assembly precision.

[0051] The oil guide groove 31 and the protrusion 32 of the gasket 3 can be located at the same position, and the oil guide groove 31 and the protrusion 32 are the front and back of the same position of the gasket. The gasket 3 can be manufactured by stamping, and the protrusion 32 is formed on the other side 34 of the gasket 3 while the oil guide groove 31 is recessed on one side 33 of the gasket 3. Such a gasket 3 has high production efficiency and low production cost.

[0052] In the case of a certain depth of the oil guide groove 31, the width W1 of the protrusion 32 can be determined by the stamping process.

[0053] The planetary gear 3 can have a certain space for movement along its axial direction A, which enables the planetary gear 3 to rotate freely. The space for movement of the planetary gear 3 along its axial direction A is determined by actual requirements, and for example, the space for movement of the planetary gear 3 along its axial direction A can be 0.5 to 1 mm.

[0054] The depth H2 of the recess 11 along the axial direction A can be greater than or equal to the space for movement of the planetary gear 3 along the axial direction A, for example, the depth H2 of the recess 11 along the axial direction A can be greater than or equal to 1 mm. In this way, the protrusion 32 of the gasket 3 can be prevented from being pulled out of the recess 11 of the planetary gear carrier 1 when the planetary gear 3 moves along the axial direction A.

[0055] The gasket 3 can be provided with a wear-resistant coating on one side and without a wear-resistant coating on the other side, that is, the gasket can be provided with a wear-resistant coating only on the side 33 facing the planetary gear 2, and thus the cost is low. The present application does not limit the type of wear-resistant coating, and a material having friction resistance can be used.

[0056] The gasket 3 can be provided with two oil guide grooves 31, and the two oil guide grooves 31 are oppositely arranged and aligned in a straight line.

[0057] Further, the oil guide groove 31 can extend along the radial direction of the planetary gear carrier 1, and the centrifugal force of the rotation of the planetary gear carrier 1 can cause the oil to flow along the oil guide groove 31 from the radial inner side to the radial outer side of the planetary gear carrier 1 when the planetary gear mechanism is working. In addition, the gasket 3 can be pushed into the installation position along the recess 11 from the radial outer side of the planetary gear carrier 1.

[0058] The installation steps of the planetary gear 2 and the gasket 3 are described below.

[0059] The planetary gear 2 and the gasket 3 are pushed together along the radial direction of the planetary gear carrier 1 to the installation position using an assembly tool, the central hole of the planetary gear 2 and the gasket 3 is aligned with the gear shaft mounting hole 13 of the planetary gear carrier 1, and then the gear shaft is installed along the axial direction. The above installation method is a closed installation, the installation steps are less, and batch production assembly is easy to realize. The installation of the gasket 3 does not require a large axial space, so the overall structure is compact.

[0060] The embodiments of the present application also provide a differential mechanism, which can include the planetary gear mechanism described above. In addition, the differential mechanism can also include two half shafts.

[0061] The planetary gear mechanism of the present application can achieve the following beneficial effects.

[0062] (1) The oil guide groove 31 that can accommodate oil can achieve better lubrication effect, and the convex part 32 and the concave part cooperate to prevent the gasket from rotating, thereby reducing the wear of the planetary gear carrier.

[0063] (2) The oil guide groove 31 and the convex part 32 are formed together by stamping, which is simple in structure and low in manufacturing cost.

[0064] (3) The gasket is provided with a wear-resistant coating on one side, which is low in cost.

[0065] (4) The gasket 3 can be installed in a closed manner, and no additional axial space is required for installing the gasket 3, so that the overall structure is compact, the installation steps are few, and batch production and assembly can be easily realized.

[0066] The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present application under the teaching of the present application without departing from the scope of the present application. In addition, the following is explained.

[0067] (1) The embodiments of the present application introduce the structure of a planetary gear mechanism, but the present application is not limited thereto, and the gasket and related structure of the planetary gear mechanism disclosed herein can also be used in various other structures of planetary gear mechanisms, and the present application does not limit this.

[0068] (2) Not limited to the examples in the drawings, the planetary gear can be a straight gear, a helical gear, etc.

[0069] It should be understood that at least part of the aspects or features of the above-mentioned embodiments, examples or examples can be appropriately combined.

[0070] It can be understood that in the present application, when the number of components or members is not particularly limited, the number thereof can be one or more, and here the plurality refers to two or more. For the case where the number of components or members is described as a specific number such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limited, and it can be understood as a plurality, i.e. two or more, but this does not mean that the present application excludes the case of one.

[0071] In the present application, unless specifically stated or limited otherwise, the terms "mounting", "assembly", "assembling", "connecting", "connection", "coupling", "joining", "abutting", "communicating", "communicate", "conducting", "fixing", "fastening" and the like shall be interpreted broadly, for example, they can be direct or indirect. For example, in terms of connection, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection via an intermediate medium; it can be internal communication of two elements, or interaction relationship between two elements, unless specifically stated or limited otherwise. For example, in terms of communication / conducting, it can be direct communication / conducting, or indirect communication / conducting via an intermediate medium. The specific meanings of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0072] In the present application, unless specifically stated or limited otherwise, one member being disposed in / mounted in / located in / contained in / placed in another member, etc. can be either of the following two cases: a part or most of the one member is located in the other member; and the one member is completely contained in the other member.

[0073] Although the present application has been described in detail using the above embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as modified embodiments without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is for the purpose of illustration only, and does not have any limiting meaning on the present application.

Claims

1. A planetary gear mechanism characterized by comprising: The planetary gear mechanism comprises a planetary gear (2), a planetary gear carrier (1), and a spacer (3) disposed between the planetary gear (2) and the planetary gear carrier (1), wherein, The planetary gear carrier (1) is provided with a recess (11) extending along its radial direction (R), The spacer (3) is an annular sheet, one side (33) of the spacer (3) is provided with an oil guide groove (31) facing the planetary gear (2) and extending along the radial direction, the oil guide groove (31) communicates the radial inner side and the radial outer side of the spacer (3), and the oil guide groove (31) can contain oil or allow oil to pass through, The other side (34) of the spacer (3) is provided with a protrusion (32) embedded in the recess (11), so that the spacer (3) cannot rotate relative to the planetary gear carrier (1).

2. The planetary gear mechanism according to claim 1, characterized in that, The oil guide groove (31) and the protrusion (32) are formed on the same position of the spacer (3) on both front and back surfaces.

3. The planetary gear mechanism according to claim 1, characterized by The spacer (3) is provided with two oil guide grooves (31), which are oppositely arranged and aligned in a straight line.

4. The planetary gear mechanism according to claim 1, characterized by The spacer (3) is provided with a wear-resistant coating only on the one side (33).

5. The planetary gear mechanism according to claim 1, characterized by The inner circumferential surface of the spacer (3) is a complete circular shape without concave-convex structure.

6. The planetary gear mechanism according to claim 1, characterized by The outer circumferential part of the planetary gear carrier (1) has a plurality of openings, and the spacer (3) and the planetary gear (2) are loaded into the planetary gear carrier (1) along the radial direction (R) from the openings.

7. The planetary gear mechanism according to claim 1, characterized by Only one spacer (3) is arranged between one axial side of the planetary gear (2) and the planetary gear carrier (1).

8. The planetary gear mechanism according to claim 1, characterized by The planetary gear (2) has a movement space along its axial direction (A), and the depth (H2) of the recess (11) along the axial direction (A) is greater than or equal to the movement space of the planetary gear (2) along the axial direction (A).

9. The planetary gear mechanism according to claim 1, characterized in that, The depth (H2) of the recess (11) along the axial direction (A) of the planetary gear carrier (1) is greater than or equal to the height (H1) of the protrusion (32) protruding from the other side (34), and / or The width (W2) of the recess (11) is greater than or equal to the width (W1) of the protrusion (32).

10. A differential characterized by, The planetary gear mechanism according to any one of claims 1 to 9.

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