Planet carrier, planet row and transmission

Abstract

The utility model relates to the technical field of planet rows, in particular to a planet carrier, a planet row and a transmission. The planet carrier comprises a planet carrier body, the planet carrier body comprises two supporting plates oppositely arranged in the axial direction of the planet carrier body, and a plurality of mounting holes used for mounting planet wheel shafts are evenly formed in the supporting plates in the circumferential direction; an oil passing groove is formed in the inner wall of at least one supporting plate, and the first end of the oil passing groove communicates with one mounting hole. According to the planet carrier, the oil passing grooves are formed in the inner walls of the supporting plates of the planet carrier, that is, the oil passing grooves are formed in the inner side faces, facing the other supporting plate, of the supporting plates, the inner oil way can be directly communicated with the planet wheel shaft oil way on the planet wheel shaft, through holes do not need to be formed in the planet carrier body in the radial direction, and the strength of the planet carrier is guaranteed; the machining difficulty of an oil way system can be reduced; the oil way structure is simpler, the cost is lower, and the precision required by machining is lower.

Description

Technical Field

[0001] The present application relates to the technical field of planetary gears, and in particular to a planetary carrier, a planetary gear and a transmission. Background Art

[0002] Planetary gears are widely used in current transmissions. Generally, planetary gears are composed of a planet carrier and a planetary gear set. The planetary gear set includes a sun gear, a plurality of planetary gears and a ring gear. The sun gear is located at the center, the ring gear is sleeved outside the sun gear, the planetary gear is located between the sun gear and the ring gear and meshes with the sun gear and the ring gear at the same time, and the plurality of planetary gears are mounted on the planet carrier through the planetary gear shaft.

[0003] In order to reduce the friction between the planetary gear and the planetary gear shaft, a bearing is set between the two. Currently, in order to lubricate and cool the bearings at this position, an additional oil-pocket structure is set to guide the lubricating oil from the main oil circuit on the sun gear or the transmission intermediate shaft into the planetary gear shaft oil circuit opened on the planetary gear shaft, and then the lubricating oil is introduced into the working space of the bearing through the planetary gear shaft oil circuit. This oil circuit design is more difficult, the structure is more complex, and the cost is higher. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a planetary carrier, a planetary gear and a transmission.

[0005] In a first aspect, the present application provides a planet carrier, comprising:

[0006] A planet carrier body, the planet carrier body comprising two support plates arranged opposite to each other in the axial direction of the planet carrier body, and a plurality of mounting holes for mounting planetary gear shafts are uniformly opened on the support plates along the circumferential direction;

[0007] An oil groove is provided on the inner wall of at least one of the support plates, a first end of the oil groove is connected to one of the mounting holes and is used to connect to the planetary gear shaft oil circuit on the planetary gear shaft in the mounting hole, and a second end of the oil groove extends toward the central axis of the planetary carrier body and is used to connect to the main oil circuit on the sun gear or the intermediate shaft.

[0008] Optionally, the width of the oil groove in a direction perpendicular to its extension direction is smaller than the diameter of the mounting hole.

[0009] Optionally, the number of the oil grooves is an integer multiple of the number of the mounting holes.

[0010] Optionally, the oil passage grooves are provided on the inner walls of the two support plates.

[0011] Optionally, the oil grooves on the two support plates correspond to each other one by one and are arranged opposite to each other in the axial direction of the planet carrier body.

[0012] Optionally, the oil groove extends in a radial direction of the support plate.

[0013] Optionally, the second end of the oil passage groove is provided with an open structure, and / or the first end of the oil passage groove is provided with an open structure, so that the oil passage groove forms a Laval nozzle structure;

[0014] The open structure and the oil passage groove are smoothly transitioned.

[0015] Optionally, the open structure is a fan-shaped arc surface structure that matches the outer wall of the mounting hole or the inner wall of the planet carrier body.

[0016] In a second aspect, the present application provides a planetary gear, comprising the planet carrier as described above, and further comprising a sun gear, a ring gear, planetary gears and a planetary gear shaft;

[0017] The planetary carrier body, the sun gear and the ring gear are coaxially sleeved; the planetary gear is rotatably arranged on the mounting hole through the planetary gear shaft, and at least one of the planetary gear shafts is provided with a planetary gear shaft oil circuit connected to the first end of the corresponding oil groove; the second end of the oil groove is used to connect to the main oil circuit on the sun gear or the intermediate shaft.

[0018] In a third aspect, the present application provides a transmission, comprising the planetary gear set as described above, and also comprising an intermediate shaft, on which the sun gear is sleeved.

[0019] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0020] The planetary carrier provided by the present application can directly connect the internal oil circuit and the planetary gear shaft oil circuit on the planetary gear shaft by opening an oil groove on the inner wall of the support plate of the planetary carrier, that is, opening an oil groove on the inner side surface of the support plate facing the other support plate, without opening a through hole radially on the planetary carrier body, thereby ensuring the strength of the planetary carrier itself and reducing the processing difficulty of the oil circuit system; at the same time, by opening the oil groove radially on the support plate, the strength of the entire support plate when playing a radial supporting role can be improved, and the use of the oil groove can form an avoidance effect when installing the planetary gear shaft and the planetary gear, which is convenient for installation. This oil circuit structure is also simpler, less expensive, and requires lower processing precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 This is a schematic structural diagram of a support plate in the planet carrier body according to an embodiment of the present application;

[0024] Figure 2 This is a schematic structural diagram of another support plate in the planet carrier body according to an embodiment of the present application;

[0025] Figure 3 for Figure 1 Sectional view at AA in the middle;

[0026] Figure 4 This is a schematic diagram of the structure in which the planet carrier described in an embodiment of the present application is installed in a transmission.

[0027] Among them, 1. planetary carrier body; 11. support plate; 111. mounting hole; 112. oil groove; 1121. open structure; 2. planetary gear shaft; 21. planetary gear shaft oil circuit; 3. sun gear; 31. sun gear oil circuit; 4. intermediate shaft; 41. intermediate shaft oil circuit; 5. planetary gear. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0030] Planetary gears are widely used in current transmissions. Generally, planetary gears are composed of a planet carrier and a planetary gear set. The planetary gear set includes a sun gear, a plurality of planetary gears and a ring gear. The sun gear is located at the center, the ring gear is sleeved outside the sun gear, the planetary gear is located between the sun gear and the ring gear and meshes with the sun gear and the ring gear at the same time, and the plurality of planetary gears are mounted on the planet carrier through the planetary gear shaft.

[0031] In order to reduce the friction between the planetary gear and the planetary gear shaft, a bearing is set between the two. Currently, in order to lubricate and cool the bearings at this position, an additional oil-pocket structure is set to guide the lubricating oil from the main oil circuit on the sun gear or the transmission intermediate shaft into the planetary gear shaft oil circuit opened on the planetary gear shaft, and then the lubricating oil is introduced into the working space of the bearing through the planetary gear shaft oil circuit. This oil circuit design is more difficult, the structure is more complex, and the cost is higher.

[0032] Based on this, the present embodiment provides a planetary carrier, a planetary gear and a transmission. By opening an oil groove on the inner wall of the support plate of the planetary carrier, that is, opening an oil groove on the inner side of the support plate facing another support plate, the internal oil circuit and the planetary gear shaft oil circuit on the planetary gear shaft can be directly connected, and there is no need to open a through hole in the radial direction on the planetary carrier body, thereby ensuring the strength of the planetary carrier itself and reducing the processing difficulty of the oil circuit system; at the same time, by opening an oil groove in the radial direction of the support plate, the strength of the entire support plate when playing a radial supporting role can be improved, and the use of the oil groove can form an avoidance effect when installing the planetary gear shaft and the planetary gear, which is convenient for installation. This oil circuit structure is also simpler, with lower cost and lower processing precision requirements. The following is a detailed description of it through specific embodiments:

[0033] Reference Figures 1 to 4 As shown, a planetary carrier provided in this embodiment includes: a planetary carrier body 1, the planetary carrier body 1 includes two support plates 11 arranged opposite to each other in the axial direction of the planetary carrier body 1, and a plurality of mounting holes 111 for mounting the planetary gear shaft 2 are evenly opened along the circumferential direction on the support plates 11; an oil groove 112 is opened on the inner wall of at least one of the support plates 11, and the first end of the oil groove 112 is connected to one of the mounting holes 111 and is used to connect to the planetary gear shaft oil path 21 on the planetary gear shaft 2 in the mounting hole 111, and the second end of the oil groove 112 extends toward the central axis of the planetary carrier body 1, and is used to connect to the main oil path on the sun gear 3 or the intermediate shaft 4.

[0034] The planetary carrier provided in the present embodiment can directly connect the internal oil circuit with the planetary gear shaft oil circuit 21 on the planetary gear shaft 2 by opening an oil groove 112 on the inner wall of the support plate 11 of the planetary carrier, that is, opening an oil groove 112 on the inner side surface of the support plate 11 facing the other support plate 11, without opening a through hole in the radial direction on the planetary carrier body 1, thereby ensuring the strength of the planetary carrier itself and reducing the processing difficulty of the oil circuit system; at the same time, by opening the oil groove 112 on the support plate 11, the strength of the entire support plate 11 when playing a supporting role can be improved, and the oil groove 112 can be used to form an avoidance effect when installing the planetary gear shaft 2 and the planetary gear 5, which is convenient for installation. This oil circuit structure is also simpler, lower in cost, and requires lower processing precision.

[0035] In some embodiments, the width of the oil groove 112 in a direction perpendicular to its extension direction is smaller than the diameter of the mounting hole 111, thereby ensuring that the oil groove 112 guides the oil accurately, preventing the oil from flowing from the oil groove 112 to the outer peripheral side of the planetary gear shaft 2, causing uncontrollable oil leakage. Specifically, the width of the oil groove 112 is smaller than the width of the planetary gear shaft oil passage 21 on the planetary gear shaft 2, ensuring that at least most of the oil flowing through the oil groove 112 flows into the planetary gear shaft oil passage 21.

[0036] In a further embodiment, the number of the oil grooves 112 is an integer multiple of the number of the mounting holes 111; that is, a plurality of oil grooves 112 may be arranged around each mounting hole 111 as long as the oil supply efficiency can be guaranteed.

[0037] In some embodiments, an oil groove 112 is provided on the inner wall of the two support plates 11; that is, the two support plates 11 arranged opposite to each other are provided with an oil groove 112 on the sides facing each other; in a further embodiment, the oil grooves 112 on the two support plates 11 correspond to each other one by one, and are arranged relatively to each other in the axial direction of the planetary carrier body 1, and the corresponding oil grooves 112 on both sides can be respectively connected to the openings of the planetary shaft oil circuit 21 at both ends of the corresponding planetary shaft 2, thereby further improving the oil supply efficiency and ensuring the cooling and lubrication effect.

[0038] In some embodiments, the oil groove 112 extends radially along the support plate 11; specifically, by utilizing the radial extension of the oil groove 112 along the support plate 11, the extension direction of the oil groove 112 can be matched with the oil throwing direction of the intermediate shaft oil circuit 41 or the sun gear oil circuit 31, further improving the cooling and lubrication effect of the planetary gear shaft 2.

[0039] In some embodiments, the second end of the oil groove 112 is provided with an open structure 1121, and / or the first end of the oil groove 112 is provided with an open structure 1121, so that the oil groove 112 forms a Laval nozzle structure; thereby further improving the oil intake of the side of the oil groove 112 facing the sun gear 3 and accelerating the oil discharge of the side of the oil groove 112 facing the planetary gear shaft 2, significantly improving the oil intake efficiency; further, the open structure 1121 and the oil groove 112 have a smooth transition; specifically, a smooth transition can be made through an arc surface or a slope, thereby improving the flow rate of the oil body and thus improving the oil intake efficiency.

[0040] In some embodiments, the open structure 1121 is a fan-shaped arc surface structure that matches the outer wall of the mounting hole 111 or the inner wall of the planet carrier body 1; Figure 1 , Figure 2 and Figure 4As shown, the fan-shaped arc surface structure can form a transition area connecting the oil groove 112 and the sun gear oil passage 31 or the oil groove 112 and the intermediate shaft oil passage 41, thereby ensuring the oil passing efficiency and forming an opening to ensure the formation of the Laval nozzle structure.

[0041] On the second aspect, the present application provides a planetary gear train, comprising the planetary carrier as described above, and also comprising a sun gear 3, a ring gear, a planetary gear 5 and a planetary gear shaft 2; the planetary carrier body 1, the sun gear 3 and the ring gear are coaxially sleeved; the planetary gear 5 is rotatably set on the mounting hole 111 through the planetary gear shaft 2, and at least one planetary gear shaft 2 is provided with a planetary gear shaft oil passage 21 connected to the first end of the corresponding oil groove 112; the second end of the oil groove 112 is used to connect to the main oil passage on the sun gear 3 or the intermediate shaft 4; since the planetary gear train includes the above-mentioned planetary carrier, the planetary gear train also has the beneficial effects of the above-mentioned planetary carrier having a simple structure, low processing difficulty and convenient assembly.

[0042] On the third aspect, the present application provides a transmission, including the planetary gear as described above, and also including an intermediate shaft 4, on which the sun gear 3 is sleeved; since the transmission includes the planetary gear as described above, the transmission also has the beneficial effects of the planetary gear, namely, simple structure, low processing difficulty and convenient assembly.

[0043] The specific implementation method and implementation principle are the same as those in the above embodiment, and can bring the same or similar technical effects, which will not be described one by one here. For details, please refer to the description of the above planetary carrier embodiment.

[0044] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A planet carrier, comprising: A planet carrier body (1), the planet carrier body (1) comprising two support plates (11) arranged opposite to each other in the axial direction of the planet carrier body (1), the support plates (11) being provided with a plurality of mounting holes (111) for mounting planetary gear shafts (2) uniformly along the circumferential direction; characterized in that: An oil groove (112) is provided on the inner wall of at least one of the support plates (11), a first end of the oil groove (112) being connected to one of the mounting holes (111) and being used to connect to the planetary gear shaft oil path (21) on the planetary gear shaft (2) in the mounting hole (111), and a second end of the oil groove (112) extending toward the central axis of the planetary carrier body (1) and being used to connect to the main oil path on the sun gear (3) or the intermediate shaft (4).

2. The planet carrier according to claim 1, characterized in that: The width of the oil passage groove (112) in a direction perpendicular to its extension is smaller than the diameter of the mounting hole (111).

3. The planet carrier according to claim 1, characterized in that: The number of the oil grooves (112) is an integer multiple of the number of the mounting holes (111).

4. The planet carrier according to claim 1, characterized in that: The oil passage grooves (112) are provided on the inner walls of the two support plates (11).

5. The planet carrier according to claim 4, characterized in that: The oil passage grooves (112) on the two support plates (11) correspond to each other one by one and are arranged opposite to each other in the axial direction of the planet carrier body (1).

6. The planet carrier according to claim 1, characterized in that: The oil passage groove (112) extends in the radial direction of the support plate (11).

7. The planet carrier according to any one of claims 1 to 6, characterized in that: The second end of the oil passage groove (112) is provided with an open structure (1121), and / or the first end of the oil passage groove (112) is provided with an open structure (1121), so that the oil passage groove (112) forms a Laval nozzle structure; The open structure (1121) and the oil passage groove (112) are smoothly transitioned.

8. The planet carrier according to claim 7, characterized in that: The open structure (1121) is a fan-shaped arc surface structure that matches the outer wall of the mounting hole (111) or the inner wall of the planet carrier body (1).

9. A planetary gear, characterized in that: A planet carrier according to any one of claims 1 to 8, further comprising a sun gear (3), a ring gear, a planet gear (5) and a planet gear shaft (2); The planet carrier body (1), the sun gear (3) and the ring gear are coaxially sleeved; the planet gear (5) is rotatably arranged on the mounting hole (111) via the planet gear shaft (2); at least one of the planet gear shafts (2) is provided with a planet gear shaft oil path (21) connected to the first end of the corresponding oil groove (112); the second end of the oil groove (112) is used to connect to the main oil path on the sun gear (3) or the intermediate shaft (4).

10. A transmission, characterized in that: The planetary gear train according to claim 9 further comprises an intermediate shaft (4), wherein the sun gear (3) is sleeved on the intermediate shaft (4).

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