Planetary gear reduction box and motor vehicle

Abstract

The present application relates to the technical field of lubrication of reduction gearbox, and discloses a planetary gear reduction gearbox and a motor vehicle, the planetary gear reduction gearbox comprising a shell, a gear ring arranged on the shell, a planet carrier rotatably connected to the shell, a sun gear arranged on the planet carrier and rotatable coaxially with the planet carrier, and a planetary gear set rotatably connected to the planet carrier and meshing with the gear ring and the sun gear respectively, characterized in that the planetary gear reduction gearbox further comprises an oil collecting disc, the oil collecting disc comprising a bottom disc and a first oil retaining ring, the bottom disc being provided with a mounting hole and a first oil guiding hole close to the outer periphery, the bottom disc being mounted on the planet carrier by the mounting hole and being rotatable synchronously with the planet carrier, the first oil guiding hole corresponding to the meshing position of the planet gear and the gear ring; the first oil retaining ring being arranged on the outer periphery of the bottom disc and protruding from the plane of the bottom disc, thereby improving the lubrication effect of the meshing area between the planetary gear and the gear ring.

Description

Technical Field

[0001] This invention relates to the field of speed reducer lubrication technology, and particularly to a planetary gear reducer and a motor vehicle. Background Technology

[0002] With the increasingly widespread application of new energy sources, new energy vehicles such as electric motorcycles and electric cars are gradually evolving from their initial emergence to a more complete system. New energy vehicles integrate a drive motor, planetary gear reducer, motor input shaft, and output shaft to form a centralized motor drive system. The drive motor drives the wheels through the motor input shaft, reduction gearbox, and output shaft, while the planetary gear reducer reduces the speed and torque provided by the drive motor, thus increasing the torque output.

[0003] A conventional planetary gear reducer includes a housing, planet carrier, planet gears, sun gear, ring gear, and differential gear. The ring gear is fixed to the housing, while the planet gears and differential gear are mounted on the planet carrier. As the planet carrier rotates, the planet gears rotate around the sun gear. The sun gear connects to the input shaft of the drive motor, serving as the driving gear. Therefore, the meshing positions of the planet gears with the sun gear and with the ring gear are constantly changing. Lubrication between the planet gears and the sun gear, and between the planet gears and the ring gear, is typically achieved through oil splashing. However, due to the compact internal structure and small gaps between components, oil has difficulty passing through these gaps and accurately lubricating the gear meshing areas, especially the planet gear and ring gear meshing area, resulting in poor lubrication. Summary of the Invention

[0004] The main objective of this invention is to provide a planetary gear reducer that improves the lubrication effect in the gear meshing area.

[0005] To achieve the above objectives, the present invention provides a planetary gear reducer, comprising a housing, a gear ring disposed on the housing, a planet carrier rotatably connected to the housing, a sun gear disposed on the planet carrier and rotatably coaxial with the planet carrier, and a set of planetary gears rotatably connected to the planet carrier and meshing with the gear ring and the sun gear respectively. The planetary gear reducer is characterized in that it further comprises an oil collection tray, the oil collection tray comprising:

[0006] The chassis has mounting holes and a first oil guide hole near its outer periphery. The chassis is mounted to the planetary carrier via the mounting holes and rotates synchronously with the planetary carrier. The first oil guide hole corresponds to the meshing point of the planetary gears and the ring gear.

[0007] The first oil baffle ring is located on the outer periphery of the chassis and protrudes from the plane of the chassis.

[0008] Optionally, the chassis has a first oil guide groove protruding away from the first oil baffle ring. The first oil guide groove is connected to the first oil guide hole and is inclined along the direction of the mounting hole pointing towards the outer periphery of the chassis.

[0009] Optionally, the first oil baffle ring is inclined toward the mounting hole, and the end of the first oil baffle ring facing away from the chassis is contracted to form a first oil collecting baffle.

[0010] Optionally, the oil collection plate further includes a second oil baffle ring, and the chassis also has a second oil guide hole;

[0011] The second oil baffle ring is disposed on the chassis and protrudes from the plane of the chassis in the same direction as the first oil baffle ring. The second oil baffle ring is located between the mounting hole and the first oil baffle ring. The second oil guide hole is located on the side of the second oil baffle ring facing away from the first oil baffle ring and is disposed close to the second oil baffle ring. The second oil guide hole corresponds to the pin shaft of the planetary gear.

[0012] Optionally, the chassis has a second oil guide groove protruding away from the first oil baffle ring, and the second oil guide groove is connected to the second oil guide hole.

[0013] Optionally, the second oil baffle ring has a second oil collecting baffle and a flow guide;

[0014] The second oil collecting baffle is formed at one end of the second oil baffle ring facing away from the chassis and extends toward the mounting hole. The guide member connects the side wall of the second oil baffle ring facing away from the first oil baffle ring and the side wall of the second oil collecting baffle facing the chassis. The guide member is opposite to the second oil guide hole.

[0015] Optionally, the guide member has a guide surface, which connects the second oil collecting baffle and the inner wall of the second oil baffle ring. The guide surface gradually approaches the axis of the second drain hole from the end of the guide member connected to the oil collecting baffle towards the end of the guide member away from the second oil collecting baffle.

[0016] Optionally, the oil collection tray further includes a connecting locking pin, which is located at the end of the first oil baffle ring facing the chassis and passes through the chassis to engage with the chassis.

[0017] Optionally, the planetary gear reducer further includes an oil supply structure, which forms an oil supply channel, and the oil outlet of the oil supply channel corresponds to the chassis in the axial direction of the planetary carrier.

[0018] The present invention also proposes a motor vehicle including the aforementioned planetary gear reducer.

[0019] In the technical solution of the present invention, the oil collection tray is installed on the planetary carrier through the mounting hole opened in the chassis and rotates synchronously with the planetary carrier. The first oil baffle ring is located on the outer periphery of the chassis and protrudes from the plane of the chassis. When the planetary carrier rotates, the lubricating oil in the oil collection tray will move towards the edge of the chassis under the action of centrifugal force and be blocked by the first oil baffle ring to the outer edge of the chassis, that is, the connection between the chassis and the first oil baffle ring. The first oil guide hole is located close to the outer periphery of the chassis. When the planetary carrier rotates, under the action of centrifugal force, it is continuously discharged from the first oil guide hole, continuously and accurately lubricating the meshing part between the planetary gear and the gear ring, thereby improving the lubrication effect of the meshing part between the planetary gear and the gear ring. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a structure of an embodiment of the planetary gear reducer provided by the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of part of the structure from a first-view perspective;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure from a second perspective;

[0024] Figure 4 for Figure 2 A cross-sectional view of the structure.

[0025] Explanation of icon numbers:

[0026]

[0027]

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0032] This invention proposes a planetary gear reducer. Figures 1 to 4 This is one embodiment of the present invention.

[0033] In an embodiment of the present invention, the planetary gear reducer is as follows: Figures 1 to 4 As shown, the planetary gear reducer 1000 includes a housing, a gear ring 2 disposed on the housing, a planet carrier 3 rotatably connected to the housing, a sun gear 4 disposed on the planet carrier 3 and rotating coaxially with the planet carrier 3, and a planetary gear set 1 rotatably connected to the planet carrier 3 and meshing with the gear ring 2 and the sun gear 4 respectively. The planetary gear reducer 1000 also includes an oil collection tray 5, which includes a base 51 and a first oil guide ring 52. The base 51 has a mounting hole 511 and a first oil guide hole 512 near its outer periphery. The base 51 is mounted on the planet carrier 3 through the mounting hole 511 and rotates synchronously with the planet carrier 3. The first oil guide hole 512 corresponds to the meshing area of ​​the planet gear and the gear ring 2. The first oil guide ring 52 is disposed on the outer periphery of the base 51 and protrudes from the plane of the base 51.

[0034] In the technical solution of the present invention, the oil collection plate 5 is mounted on the planetary carrier 3 through the mounting hole 511 opened in the base plate 51 and rotates synchronously with the planetary carrier 3. The first oil baffle ring 52 is located on the outer periphery of the base plate 51 and protrudes from the plane of the base plate 51. When the planetary carrier 3 rotates, the lubricating oil in the oil collection plate 5 will move towards the edge of the base plate 51 under the action of centrifugal force and be blocked by the first oil baffle ring 52 at the outer edge of the base plate 51, that is, at the connection between the base plate 51 and the first oil baffle ring 52. The first oil guide hole 512 is located close to the outer periphery of the base plate 51. When the planetary carrier 3 rotates, under the action of centrifugal force, it is continuously discharged from the first oil guide hole 512, continuously and accurately lubricating the meshing part between the planetary gear and the gear ring 2, thereby improving the lubrication effect of the meshing part between the planetary gear and the gear ring 2.

[0035] Normally, the meshing area between the planetary gear and the ring gear 2 extends beyond the outer periphery of the planet carrier 3. If the first oil guide hole 512 is directly opposite the aforementioned meshing area, the size of the planetary gear reducer 1000 needs to be slightly increased to accommodate the installation of the first oil baffle ring 52. This would increase design costs. To ensure that lubricating oil can be accurately discharged from the meshing area between the planetary gear and the ring gear 2 through the first oil guide hole 512, and to avoid affecting the size of the planetary gear reducer 1000, in one embodiment, the chassis 51 forms a first oil guide groove 513 protruding away from the first oil baffle ring 52. The oil guide groove 513 is connected to the first oil guide hole 512 and is inclined along the direction of the mounting hole 511 pointing towards the outer periphery of the chassis 51. On the one hand, the first oil guide groove 513 is equivalent to lengthening the outlet of the lubricating oil, so that the position of the lubricating oil discharged from the oil collection plate 5 is closer to the above-mentioned meshing area, which can reduce the loss of lubricating oil splash caused by centrifugal force. On the other hand, the inclined first oil guide groove 513 can make the position of the first oil outlet hole closer to the center, and the radius of the first oil baffle ring 52 can also be reduced to a certain extent. It is only necessary to make the end of the first oil guide groove 513 directly opposite the above-mentioned meshing area.

[0036] In one embodiment, the first oil baffle ring 52 is inclined toward the mounting hole 511, and the end of the first oil baffle ring 52 facing away from the chassis 51 is tapered to form a first oil collecting edge 521. The first oil collecting edge 521 is used to prevent lubricating oil from being thrown out from the end of the first oil baffle ring 52 facing away from the chassis 51 under the high-speed rotation of the planetary carrier 3. This inclined design allows the lubricating oil to flow faster toward the first oil guide hole 512 when it moves along the inner side of the inclined surface under the action of centrifugal force. Furthermore, the inclined design of the first oil baffle ring 52 can effectively reduce the overall envelope size of the oil collecting plate 5, leaving more operational space for the structural design of the planetary gear reducer and increasing the applicable scenarios.

[0037] To achieve lubrication of the planetary pin 7, in one embodiment, the oil collection plate 5 further includes a second oil retainer ring 53, and the chassis 51 also forms a second oil guide hole 514. The second oil retainer ring 53 is disposed on the chassis 51 and protrudes from the plane of the chassis 51 in the same direction as the first oil retainer ring 52. The second oil retainer ring 53 is located between the mounting hole 511 and the first oil retainer ring 52. The second oil guide hole 514 is located on the side of the second oil retainer ring 53 facing away from the first oil retainer ring 52 and is disposed close to the second oil retainer ring 53. The second oil guide hole 514 corresponds to the planetary pin 7. When the planet carrier 3 rotates, the second oil retainer ring 53 blocks the lubricating oil in the area of ​​the chassis 51 between the mounting hole 511 and the second oil retainer ring 53, and causes the lubricating oil to collect at the second oil retainer ring 53. The lubricating oil is then guided to the planetary pin 7 through the second oil guide hole 514 disposed close to the second oil retainer ring 53 for lubrication.

[0038] To improve the accuracy of the second oil guide hole 514 in guiding lubricating oil to the planetary gear pin, the chassis 51 is formed with a second oil guide groove 515 protruding away from the first oil baffle ring 52. The second oil guide groove 515 is connected to the second oil guide hole 514. The second oil guide groove 515 is equivalent to reducing the distance between the second oil guide hole 514 and the planetary gear pin, reducing the influence of centrifugal force when discharging lubricating oil, and increasing the amount of lubricating oil that can accurately reach the planetary gear pin.

[0039] To facilitate the flow of lubricating oil into the second guide hole, in one embodiment, the second oil baffle ring 53 has a second oil collecting baffle 531 and a guide member 532. The second oil collecting baffle 531 is formed at one end of the second oil baffle ring 53 facing away from the chassis 51 and extends toward the mounting hole 511. The guide member 532 connects the side wall of the second oil baffle ring 53 facing away from the first oil baffle ring 52 and the side wall of the second oil collecting baffle 531 facing the chassis 51. The guide member 532 and the second oil collecting baffle 531 are connected to the second oil collecting baffle 531. The two oil guide holes 514 are opposite each other; the second oil collecting baffle 531 can prevent lubricating oil from being thrown out from the end of the second oil baffle ring 53 facing away from the chassis 51 when the planetary carrier 3 rotates at high speed, and the guide member 532 connects the side wall of the second oil baffle ring 53 facing away from the first oil baffle ring 52 and the side wall of the second oil collecting baffle 531 facing the chassis 51, and can accurately guide the lubricating oil on the side wall of the second oil baffle ring 53 and the second oil collecting baffle 531 into the second oil guide hole 514.

[0040] To specifically achieve the guiding function of the guide member 532, in one embodiment, the guide member 532 is formed with a guiding surface. The guiding surface connects the inner wall of the second oil collecting baffle 531 and the second oil baffle ring 53. The guiding surface gradually approaches the axis of the second drainage hole from the end of the guide member 532 connected to the oil collecting baffle towards the end of the guide member 532 away from the second oil collecting baffle 531, so as to guide the lubricating oil into the drainage hole through the guiding surface. The specific shape of the guide member 532 is not limited, as long as it can form a guiding surface that simultaneously connects the inner wall of the second oil collecting baffle 531 and the second oil baffle ring 53. Furthermore, the guiding surface is preferably smoothly connected to the inner wall of the second oil collecting baffle 531 and the second oil baffle ring 53 to obtain higher oil collection efficiency. In this embodiment, the flow guide 532 is approximately a triangular prism. One side of the flow guide 532 is connected to the second oil collecting baffle 531, and one bottom surface is connected to the inner sidewall of the second oil baffle ring 53. The other two sides serve as two flow guide surfaces, which respectively guide the flow when the planetary carrier 3 rotates in two different directions.

[0041] If necessary, the guide member 532 may also be provided between the inner wall of the first oil collecting baffle 521 and the first oil baffle ring 52.

[0042] To achieve the installation and fixation of the first oil baffle ring 52 on the chassis 51, in one embodiment, the oil collection tray 5 further includes a connecting locking pin 54. The connecting locking pin 54 is located at the end of the first oil baffle ring 52 facing the chassis 51 and passes through the chassis 51 to engage with it, thereby achieving the installation and fixation of the first oil baffle ring 52 on the chassis 51. Specifically, the connecting locking pin 54 comprises three circumferentially arranged elastic pins spaced apart from each other, each with a limiting protrusion at its end. When the connecting locking pin 54 passes through the chassis 51, the three elastic pins move closer together, causing the limiting protrusions to converge and reducing the outer radius of each limiting protrusion to pass through the chassis 51. After passing through, the elastic pins move away from each other under elastic force, increasing the outer radius of the three limiting protrusions and locking them onto the chassis 51. The second oil baffle ring 53 is connected and locked in the same way as the first oil baffle ring 52.

[0043] To supply lubricating oil to the oil collection tray 5, in one embodiment, the planetary gear reducer 1000 further includes an oil supply structure 6. The oil supply structure 6 is used to connect to an external oil conveying device. The oil supply structure 6 forms an oil supply channel, and the oil outlet of the oil supply channel corresponds axially to the chassis 51 on the planetary carrier 3. More specifically, the oil supply channel has two oil outlets, which respectively correspond to the areas of the oil collection tray 5 between the first oil baffle ring and the second oil baffle ring 53, and the area between the second oil baffle ring 53 and the mounting hole 511, so as to simultaneously supply oil to the two areas, thereby lubricating the meshing area of ​​the planetary gear and the gear ring 2, as well as the planetary gear pin.

[0044] The present invention also proposes a motor vehicle, which includes the planetary gear reducer 1000. The specific structure of the planetary gear reducer 1000 is as described in the above embodiments. Since the present motor vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0045] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A planetary gear reducer, comprising a housing, a ring gear disposed on the housing, a planet carrier rotatably connected to the housing, a sun gear disposed on the planet carrier and rotatably coaxial with the planet carrier, and a planetary gear set rotatably connected to the planet carrier and meshing with the ring gear and the sun gear respectively, wherein the planetary gear set comprises at least two stages of planetary gears, characterized in that, The planetary gear reducer also includes an oil collection tray, which comprises: The chassis has mounting holes and a first oil guide hole near its outer periphery. The chassis is mounted to the planetary carrier via the mounting holes and rotates synchronously with the planetary carrier. The first oil guide hole corresponds to the meshing point of the planetary gears and the ring gear. The first oil baffle ring is located on the outer periphery of the chassis and protrudes from the plane of the chassis. The oil collection plate also includes a second oil baffle ring, and the chassis also has a second oil guide hole; The second oil baffle ring is disposed on the chassis and protrudes from the plane of the chassis in the same direction as the first oil baffle ring. The second oil baffle ring is located between the mounting hole and the first oil baffle ring. The second oil guide hole is located on the side of the second oil baffle ring facing away from the first oil baffle ring and is disposed close to the second oil baffle ring. The second oil guide hole corresponds to the pin shaft of the planetary gear.

2. The planetary gear reducer as described in claim 1, characterized in that, The chassis has a first oil guide groove protruding away from the first oil baffle ring. The first oil guide groove is connected to the first oil guide hole and is inclined along the direction of the mounting hole pointing to the outer periphery of the chassis.

3. The planetary gear reducer as described in claim 1 or 2, characterized in that, The first oil baffle ring is inclined toward the mounting hole, and the end of the first oil baffle ring facing away from the chassis is contracted to form a first oil collecting baffle.

4. The planetary gear reducer as described in claim 1 or 2, characterized in that, The chassis has a second oil guide groove protruding away from the first oil baffle ring, and the second oil guide groove is connected to the second oil guide hole.

5. The planetary gear reducer as described in claim 1 or 2, characterized in that, The second oil baffle ring has a second oil collecting baffle and a flow guide; The second oil collecting baffle is formed at one end of the second oil baffle ring facing away from the chassis and extends toward the mounting hole. The guide member connects the side wall of the second oil baffle ring facing away from the first oil baffle ring and the side wall of the second oil collecting baffle facing the chassis. The guide member is opposite to the second oil guide hole.

6. The planetary gear reducer as described in claim 5, characterized in that, The guide member has a guide surface, which connects the second oil collecting baffle and the inner wall of the second oil baffle ring. The guide surface gradually approaches the axis of the second drain hole from the end of the guide member connected to the oil collecting baffle towards the end of the guide member away from the second oil collecting baffle.

7. The planetary gear reducer as described in claim 1 or 2, characterized in that, The oil collection tray also includes a connecting locking pin, which is located at the end of the first oil baffle ring facing the chassis and passes through the chassis to engage with the chassis.

8. The planetary gear reducer as described in claim 1 or 2, characterized in that, The planetary gear reducer also includes an oil supply structure, which forms an oil supply channel, and the oil outlet of the oil supply channel corresponds to the chassis along the axial direction of the planetary carrier.

9. A motor vehicle, characterized in that, Includes the planetary gear reducer as described in any one of claims 1 to 8.

Images