Planet carrier and transmission device

Abstract

The utility model provides a planet carrier and a transmission device. The planet carrier includes a first holder and a second holder. The first retaining piece is used for supporting the first planet wheel to rotate on the axial side of the first planet wheel. And the second retainer is used for supporting the first planet wheel to rotate on the other axial side of the first planet wheel. The first holder includes a first connection portion. The first connecting portion extends in the axial direction and engages on the second holder. At least one of the first retainer and the second retainer is provided with a stamped groove configured to receive an axial end of the first planet gear. In this way, the planet carrier can have a smaller weight.

Description

Technical Field

[0001] The present application relates to the field of transmission devices, and more specifically to a planetary carrier and a transmission device. Background Art

[0002] Chinese invention patent application CN103328864A discloses a planetary gear carrier. The first retaining member can be made of a plate-like member, punched out by stamping, or made by bending, cutting, etc. The second retaining member can be made of a plate-like member, punched out by stamping. The second joint portion of the joint between the first retaining member and the second retaining member is a joint formed by welding. However, there is still room for improvement in the lightweight aspect of the above-mentioned planetary gear carrier. Utility Model Content

[0003] The present application provides a planetary carrier as follows, comprising a first retaining member and a second retaining member, wherein the first retaining member is used to support the first planetary gear for rotation on one axial side of the first planetary gear, and the second retaining member is used to support the first planetary gear for rotation on the other axial side of the first planetary gear, the first retaining member comprises a first connecting portion, the first connecting portion extends along the axial direction and is engaged on the second retaining member, and at least one of the first retaining member and the second retaining member is provided with a stamped groove, and the stamped groove is configured to receive the axial end of the first planetary gear.

[0004] In an optional solution, the second retaining member is provided with the stamping groove.

[0005] In another optional scheme, the second retaining member also includes a second connecting portion, the stamping groove and the second connecting portion are formed at the same circumferential position of the second retaining member, and the planetary carrier also includes a third retaining member, the second retaining member is used to support the second planetary gear to rotate on one axial side of the second planetary gear, and the third retaining member is used to support the second planetary gear to rotate on the other axial side of the second planetary gear, and the second connecting portion is engaged on the third retaining member.

[0006] In another optional solution, the first connecting portion and the second retaining member are joined by welding.

[0007] In another optional solution, the first connecting portion and the stamping groove are staggered in the circumferential direction of the planet carrier.

[0008] In another optional solution, the second retaining member includes a plate-shaped base, and a notch is provided on the periphery of the base, and the notch receives the first connecting portion.

[0009] In another optional solution, the radial width of the notch is greater than or equal to the radial thickness of the first connecting portion.

[0010] The present application also provides a transmission device as follows, comprising: the above-mentioned planetary carrier; the first planetary gear; and a second planetary gear, which is supported on the planetary carrier and arranged axially outside the first retaining member and the second retaining member.

[0011] In an optional solution, one of the first planet gear and the second planet gear is configured to input torque to the planet carrier, and the other of the first planet gear and the second planet gear is configured to receive torque from the planet carrier.

[0012] In another optional solution, a third planetary gear is further included, wherein the third planetary gear is supported on the planet carrier and meshes with the second planetary gear.

[0013] By adopting the above technical solution, by making the stamped groove receive the axial end of the first planetary gear, the axial spacing between the first retaining member and the second retaining member can be shortened, so that the first connecting portion can have a smaller axial length. The shorter first connecting portion can save material usage, thereby helping to reduce the weight of the retaining frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a partial structure of a planet carrier according to an embodiment of the present application.

[0015] Figure 2 yes Figure 1 Schematic diagram of the first retaining element of the planet carrier.

[0016] Figure 3 yes Figure 1 Schematic diagram of the second retaining member of the planet carrier.

[0017] Description of Reference Numerals

[0018] 30 Planet carrier

[0019] 32 first retaining member

[0020] 34 second retaining member

[0021] 36 First base

[0022] 38 First axis hole

[0023] 40 First connection part

[0024] 42 Second base

[0025] 44 Second axis hole

[0026] 46 Third axis hole

[0027] 48 Fourth axis hole

[0028] 50 Stamping slot

[0029] 52 First Gap

[0030] 54 Second connection

[0031] A-axis

[0032] C Circumferential DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0034] Figure 1 3 is a schematic diagram of a partial structure of the planet carrier 30. The planet carrier 30 may include a first retaining member 32, a second retaining member 34, and a third retaining member (not shown in the figure). The first retaining member 32, the second retaining member 34, and the third retaining member may be coaxially arranged, and the second retaining member 34 may be welded to the first retaining member 32 and the third retaining member.

[0035] Figure 2 is a schematic diagram of the first retaining member 32 .

[0036] The first retainer 32 may include a first base portion 36. The first base portion 36 may be substantially in the shape of a circular plate and arranged perpendicularly to the axial direction A of the planet carrier 30.

[0037] The first base portion 36 may include a plurality of first shaft holes 38 . The first shaft holes 38 may penetrate the first base portion 36 along the axial direction A, and the plurality of first shaft holes 38 may be evenly spaced in the circumferential direction C of the planet carrier 30 .

[0038] The first retaining member 32 may further include a plurality of first connecting portions 40. The first connecting portion 40 may be a plate extending in the axial direction A and having a thickness in the radial direction of the planet carrier 30. One end of the first connecting portion 40 on one axial side may be connected to the outer periphery of the first base portion 36, and the other end of the first connecting portion 40 on the axial side may be welded to the second retaining member 34.

[0039] The first retaining member 32 may be entirely stamped from a sheet material, such as a metal sheet. The first base portion 36 and the first connecting portion 40 may have substantially the same thickness.

[0040] Figure 3 is a schematic diagram of the second retaining member 34 .

[0041] The second holder 34 may include a second base 42 (an example of a base). The second base 42 may be substantially disk-shaped and arranged perpendicularly to the axial direction A. The second base 42 may be provided on the other side of the first base 36 in the axial direction and arranged coaxially with the first base 36 .

[0042] The second base portion 42 may include a plurality of second shaft holes 44 . The second shaft holes 44 may penetrate the second base portion 42 along the axial direction A, and the plurality of second shaft holes 44 may be evenly spaced apart in the circumferential direction C. Each second shaft hole 44 may be coaxially disposed with one first shaft hole 38 .

[0043] The second base portion 42 may further include a plurality of third shaft holes 46. The third shaft holes 46 may penetrate the second base portion 42 along the axial direction A, and the plurality of third shaft holes 46 may be evenly spaced in the circumferential direction C.

[0044] The second base portion 42 may further include a plurality of fourth shaft holes 48. The fourth shaft holes 48 may penetrate the second base portion 42 along the axial direction A, and the plurality of fourth shaft holes 48 may be evenly spaced in the circumferential direction C.

[0045] The second shaft hole 44 , the third shaft hole 46 , and the fourth shaft hole 48 may be staggered in the circumferential direction C, and each third shaft hole 46 may be disposed between adjacent second shaft holes 44 and fourth shaft holes 48 .

[0046] The second base 42 may further include a plurality of punching grooves 50. The punching grooves 50 may be disposed at the outer periphery of the second base 42 and may be recessed toward the other axial side. The axial cross section (a cross section perpendicular to the axial direction A) of the punching grooves 50 may be substantially semicircular and open toward the radially outer side of the second base 42. The second axial holes 44 may be disposed at the axial bottom of the punching grooves 50, and each punching groove 50 may correspond to one second axial hole 44. The third axial hole 46 and the fourth axial hole 48 may be staggered from the punching grooves 50 in the circumferential direction C.

[0047] The second base 42 may further include a plurality of first notches 52 (examples of notches). The first notches 52 may be disposed on the outer periphery of the second base 42, and the plurality of first notches 52 may be evenly spaced in the circumferential direction C. The first notches 52 and the stamping grooves 50 may be arranged alternately along the circumferential direction C, that is, the first notches 52 and the stamping grooves 50 are staggered in the circumferential direction C. Each first notch 52 may receive the other axial end of a first connection portion 40, and a welding spot may be disposed between the inner circumferential surface of the first connection portion 40 and the radial wall surface of the first notch 52 (the wall surface perpendicular to the radial direction). Of course, this also means that the first connection portion 40 and the stamping groove 50 are staggered in the circumferential direction C.

[0048] Further, the radial width of the first notch 52 may be greater than or equal to the radial thickness of the first connection portion 40, so that the first connection portion 40 is not radially further outward than the outer periphery of the second base portion 42. In this way, the planet carrier 30 can have a more compact structure, thereby facilitating the reduction of the weight of the planet carrier 30. Preferably, the first retaining member 32 and the second retaining member 34 may have the same maximum diameter.

[0049] Of course, in other embodiments, the first connection portion 40 may not be a part of the first retaining member 32, but a part of the second retaining member 34. For example, one axial end of the first connection portion 40 may be welded to the first retaining member 32, and the other axial end of the first connection portion 40 may be integrally formed on the outer periphery of the second base portion 42. Accordingly, the first notch 52 may be provided on the first base portion 36, and engages one axial end of the first connection portion 40.

[0050] The second retaining member 34 may further include a plurality of second connecting portions 54. The second connecting portion 54 may be a plate extending in the axial direction A and having a thickness in the radial direction of the planet carrier 30. One axial end of the second connecting portion 54 may be connected to the outer periphery of the second base 42, and the other axial end of the second connecting portion 54 may be welded to the third retaining member. The stamping groove 50 and the second connecting portion 54 may overlap in the circumferential direction C, and each stamping groove 50 may correspond to one second connecting portion 54.

[0051] The entire second retaining member 34 may be stamped from a sheet material, for example, may be stamped from a metal sheet. The second base portion 42 and the second connecting portion 54 may have substantially the same thickness.

[0052] The third retainer may be generally disk-shaped as a whole and arranged perpendicularly to the axial direction A. The third retainer may be provided on the other axial side of the second base portion 42 and arranged coaxially with the first base portion 36 and the second base portion 42 .

[0053] The third retaining member may include a plurality of fifth axial holes. The fifth axial holes may penetrate the third retaining member along the axial direction A, and each fifth axial hole may be coaxially arranged with one first axial hole 38 and one second axial hole 44 .

[0054] The third retaining member may further include a plurality of sixth axial holes. The sixth axial holes may penetrate the third retaining member along the axial direction A, and each sixth axial hole may be coaxially arranged with one third axial hole 46 .

[0055] The third retaining member may further include a plurality of seventh axial holes. The seventh axial holes may penetrate the third retaining member along the axial direction A, and the plurality of seventh axial holes may be coaxially arranged with one fourth axial hole 48 .

[0056] The third retaining member may further include a plurality of second notches. The second notches may be provided at the outer periphery of the third retaining member, and the plurality of second notches may be evenly spaced in the circumferential direction C. Each second notch may receive the other axial end of a second connecting portion 54, and a welding spot may be provided between the inner circumferential surface of the second connecting portion 54 and the radial wall surface (wall surface perpendicular to the radial direction) of the second notch.

[0057] Further, the radial width of the second notch may be greater than or equal to the radial thickness of the second connection portion 54, so that the second connection portion 54 is not radially further outward than the outer periphery of the third retaining member. In this way, the planet carrier 30 can have a more compact structure, thereby facilitating the reduction of the weight of the planet carrier 30. Preferably, the second retaining member 34 and the third retaining member may have the same maximum diameter.

[0058] The entire third retaining member can be obtained by stamping a sheet material, for example, by stamping a metal sheet.

[0059] The present application also provides a transmission device including the planet carrier 30, in particular a transmission device suitable for electric vehicles or hybrid vehicles. For example, the transmission device can be used as a part of an electric drive axle, and the motor can transmit torque to the wheels via the transmission device.

[0060] The transmission device may further include a plurality of first planetary shafts. The first planetary shafts may be inserted into the first shaft hole 38, the second shaft hole 44 and the fifth shaft hole, and supported on the first retaining member 32, the second retaining member 34 and the third retaining member.

[0061] The transmission device may further include a plurality of first planetary gears. The first planetary gears may be disposed between the first retaining member 32 and the second retaining member 34 (i.e., axially inward of the first retaining member 32 and the second retaining member 34), and may be mounted on the first planetary shaft via a rotating bearing, so that the first planetary gears may rotate relative to the first planetary shaft. The stamping groove 50 may receive the other axial end of the first planetary gear.

[0062] It can be understood that by allowing the stamping groove 50 to receive the other axial end of the first planetary gear, the axial spacing between the first base portion 36 and the second base portion 42 can be shortened, so that the first connecting portion 40 can have a smaller axial length. A shorter first connecting portion 40 can save material usage, thereby helping to reduce the weight of the retainer 30.

[0063] Of course, in other embodiments, the stamping groove 50 may also be provided on the first base 36 to receive the axial end of one side of the first planetary gear. It should be noted that, although this method can also shorten the first connecting portion 40, compared with the arrangement method of providing the stamping groove 50 on the second base 42, providing the stamping groove 50 on the first base 36 may increase the axial length of the entire planetary carrier 30, which is not conducive to the compact arrangement of the electric drive axle.

[0064] The transmission device may further include a first sun gear. The first sun gear may be disposed between the first retaining member 32 and the second retaining member 34 and arranged coaxially with the planet carrier 30. The plurality of first planetary gears may mesh with the first sun gear from a radially outer side of the first sun gear.

[0065] The transmission device may further include a ring gear, which may be sleeved on the planet carrier 30, and the plurality of first planetary gears may mesh with the ring gear from the radial inner side of the ring gear.

[0066] The planet carrier 30, the first planet shaft, the first planet gear, the first sun gear and the ring gear can constitute a transmission. The first sun gear can be used as the input end of the transmission, and the planet carrier 30 can be used as the output end of the transmission. In the use scenario mentioned above, the motor can be connected to the first sun gear via a drive shaft.

[0067] The transmission device may further include a plurality of second planetary shafts. The second planetary shafts may be inserted into the third shaft hole and the sixth shaft hole, and supported on the second retaining member 34 and the third retaining member.

[0068] The transmission device may further include a plurality of second planetary gears. The second planetary gears may be disposed between the second retaining member 34 and the third retaining member (i.e., axially outside the first retaining member 32 and the second retaining member 34), and may be mounted on the second planetary shaft via a rotating bearing so that the second planetary gears may rotate relative to the second planetary shaft.

[0069] It can be understood that the axial outer side of the first retaining member 32 and the second retaining member 34 is not limited to the other axial side of the second retaining member 34 (the side away from the first retaining member 32), but can also be one axial side of the first retaining member 32 (the side away from the second retaining member 34).

[0070] The transmission device may further include a second sun gear. The second sun gear may be disposed between the second holder 34 and the third holder and arranged coaxially with the planet carrier 30. A plurality of second planetary gears may mesh with the second sun gear from a radially outer side of the second sun gear.

[0071] The transmission device may further include a plurality of third planetary shafts. The third planetary shafts may be inserted into the fourth shaft hole and the seventh shaft hole, and supported on the second retaining member 34 and the third retaining member.

[0072] The transmission device may further include a plurality of third planetary gears. The third planetary gears may be disposed between the second retaining member 34 and the third retaining member and mounted on the third planetary shaft via a rotating bearing so that the third planetary gears can rotate relative to the third planetary shaft. Each third planetary gear may mesh with a second planetary gear.

[0073] The transmission device may further include a third sun gear. The third sun gear may be disposed between the second holder 34 and the third holder, and arranged coaxially with the planet carrier 30. A plurality of third planetary gears may mesh with the third sun gear from a radially outer side of the third sun gear.

[0074] The planet carrier 30, the second planet shaft, the second planet gear, the second sun gear, the third planet shaft, the third planet gear and the third sun gear can constitute a differential. The planet carrier 30 can serve as the input end of the differential, and the second sun gear and the third sun gear can serve as two output ends of the transmission. In the usage scenario mentioned above, for example, the second sun gear and the third sun gear can be connected to two wheels via two different half shafts, respectively.

[0075] Here, the second planetary gear, the second sun gear, the third planetary gear and the third sun gear may adopt the same or similar arrangement as that of Chinese invention patent application CN109952455A, which will not be described in further detail here, and the entire contents of CN109952455A are incorporated herein by reference.

[0076] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application.

Claims

1. A planet carrier, comprising a first retaining member and a second retaining member, wherein the first retaining member is used to support the first planetary gear for rotation on one axial side of the first planetary gear, and the second retaining member is used to support the first planetary gear for rotation on the other axial side of the first planetary gear, wherein the first retaining member comprises a first connecting portion, the first connecting portion extends along the axial direction and is engaged with the second retaining member, wherein: At least one of the first retainer and the second retainer is provided with a stamped groove configured to receive an axial end portion of the first planet gear.

2. The planet carrier according to claim 1, characterized in that: The second retaining member is provided with the punching groove.

3. The planet carrier according to claim 2, characterized in that: The second retaining member further includes a second connecting portion, and the stamping groove and the second connecting portion are formed at the same position in the circumferential direction of the second retaining member. The planet carrier also includes a third retaining member, the second retaining member is used to support the second planetary gear for rotation on one axial side of the second planetary gear, the third retaining member is used to support the second planetary gear for rotation on the other axial side of the second planetary gear, and the second connecting portion is engaged on the third retaining member.

4. The planet carrier according to any one of claims 1 to 3, characterized in that The first connection portion and the second retaining member are joined by welding.

5. The planet carrier according to any one of claims 1 to 3, characterized in that The first connection portion and the stamping groove are staggered in the circumferential direction of the planet carrier.

6. The planet carrier according to any one of claims 1 to 3, characterized in that The second retaining member includes a plate-shaped base, a notch is provided on the outer periphery of the base, and the notch receives the first connecting portion.

7. The planet carrier according to claim 6, characterized in that: A radial width of the notch is greater than or equal to a radial thickness of the first connecting portion.

8. A transmission device, characterized in that: include: The planet carrier according to any one of claims 1 to 7; the first planetary gear; as well as The second planetary gear is supported on the planetary carrier and is arranged axially outside the first retaining member and the second retaining member.

9. The transmission device according to claim 8, characterized in that: One of the first planet gear and the second planet gear is configured to input torque to the planet carrier, and The other of the first planet gear and the second planet gear is configured to receive torque from the planet carrier.

10. The transmission device according to claim 8, characterized in that: The system further includes a third planetary gear, which is supported on the planet carrier and meshes with the second planetary gear.

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