Planetary gear speed reducer
By setting up oil coupling parts and oil circuits in the planetary gear reducer, the lubricating oil is collected and redistributed, the problems of poor lubrication and oil leakage are solved, the lubricating effect of the ring gear and planetary gear is improved, and the service life of the reducer is extended .
Patent Information
- Application Number
- CN202411484919.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2024-12-24
AI Technical Summary
When the planetary gear reducer rotates at high speed, the lubricating oil forms a vortex due to centrifugal force, resulting in poor lubrication and oil leakage, which in turn causes problems such as high gear temperature, bearing burning and shortening of life.
Design a planetary gear reducer. By setting oil couplings in the shell, lubricating the lubricating oil thrown out of the upper part of the cylindrical gear and lubrication of the ring gear and planetary gear through the newly established oil path, including setting on the inner wall of the shell Annular grooves and oil-through holes form flow channels of lubricating oil to ensure effective lubrication of ring gears and planetary gears.
Effectively save lubricating oil, improve the lubricating effect of the ring gear and planetary gear, extend the service life of the reducer, avoid lubricating oil leakage, improve the stability of the oil surface, and prevent wear and burn caused by poor lubrication. .
Smart Images
Figure CN119178020A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of reducers, in particular to a planetary gear reducer. Background Art
[0002] When the planetary gear reducer is running, the sun gear, connecting gear sleeve and upper bearing located on the center line all rotate synchronously with the motor at high speed. At the same time, the large planetary carrier also rotates around the center line. At this time, the lubricating oil in the inner cavity of the reducer rotates along the inner wall of the casing to form a vortex under the action of the centrifugal force generated by the rotation of the above-mentioned parts. There are the following problems in this process: on the one hand, poor lubrication of some parts in the reducer can easily lead to high temperature of gears, burning of bearings, etc.; on the other hand, the lubricating oil is easy to fly out from the upper end of the casing, which is prone to lubricating oil leakage, resulting in a shortened life of the reducer. Summary of the invention
[0003] The present invention aims at the technical problems existing in the prior art and provides a planetary gear reducer, which collects the lubricating oil thrown out from the upper part of the cylindrical gear to lubricate the devices in the housing, such as the ring gear and the planetary gear, thereby effectively saving the lubricating oil and extending the service life of the reducer.
[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a planetary gear reducer comprises a housing, an oil receiving piece and a gear ring located in the housing, the oil receiving piece receives the lubricating oil thrown out from the upper part of the cylindrical gear in the inner cavity of the housing, so that a part of the lubricating oil in the oil receiving piece is used to lubricate the outer circumferential surface of the gear ring, and another part of the lubricating oil enters the inner wall of the gear ring along the first oil through hole in the circumferential direction of the gear ring through the annular groove on the inner wall of the housing to lubricate the planetary gear.
[0005] As a further technical solution, the oil receiving member is arranged on a boss on the inner wall of the housing and is located above the gear ring; The top end surface of the oil receiving member is located below the top end surface of the cylindrical gear, and the upper end surface of the oil receiving member is opened to receive the lubricating oil thrown out from the cylindrical gear.
[0006] As a further technical solution, there is a gap between the bottom end surface of the oil receiving piece and the upper outer circumferential surface of the gear ring, and the second oil hole on the oil receiving piece is opposite to the gap, so that a part of the lubricating oil in the oil receiving piece flows to the outer circumferential surface of the upper part of the gear ring through the second oil hole.
[0007] As a further technical solution, a third oil through hole is provided on a side of the oil receiving member close to the boss, and the third oil through hole is communicated with the annular groove.
[0008] As a further technical solution, the annular groove is opposite to the outer circumferential surface of the gear ring to form a channel for the flow of lubricating oil, and the center line of the annular groove in the width direction coincides with the center line of the gear ring in the width direction.
[0009] As a further technical solution, the width of the annular groove is smaller than the width of the outer circumferential surface of the gear ring.
[0010] As a further technical solution, the bottom end surface of the oil receiving member is an arc-shaped surface to match the outer circumferential surface of the upper portion of the gear ring.
[0011] As a further technical solution, the height of the second oil hole is greater than that of the third oil hole, so that the lubricating oil in the oil receiving member moves from the direction of the second oil hole to the direction of the third oil hole.
[0012] As a further technical solution, the second oil holes are provided in a plurality of groups along the width direction of the gear ring.
[0013] As a further technical solution, the inner side of the ring gear is meshed with the planetary gears.
[0014] The beneficial effects of the present invention are: 1. After collecting the lubricating oil thrown out from the upper part of the cylindrical gear, the newly added oil circuit is used to lubricate the ring gear and planetary gear, which improves the lubrication effect of the ring gear and planetary gear in the housing and prolongs the service life of the reducer; 2. The present invention sets an oil receiving piece inside the original reducer and sets a first oil through hole on the gear ring, forming a lubricating oil path from the upper part of the cylindrical gear through the oil receiving piece, the gear ring, and the planetary gear in sequence, so as to collect the lubricating oil thrown out by centrifugal force inside the housing during operation, and then lubricate the outer cylindrical surface of the gear ring and the planetary gear meshing with the inner ring of the gear ring through the newly set lubricating oil path, on the one hand, reducing the amount of lubricating oil thrown onto the inner wall of the housing, and avoiding the occurrence of oil leakage caused by the lubricating oil thrown out of the housing; on the other hand, using the new internal lubricating oil path to lubricate the gear ring and the planetary gear, thereby improving their working efficiency; 3. The design of the new oil circuit improves the relative stability of the oil level inside the housing, avoiding the problem of too high oil level affecting the transmission efficiency and too low oil level causing poor lubrication. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of a planetary gear reducer of the present invention with part of the housing removed; Figure 2 This is a schematic structural diagram of a planetary gear reducer of the present invention with part of the housing removed from another perspective; Figure 3 for Figure 2Schematic diagram of the cross-sectional structure from the middle AA perspective; Figure 4 It is a schematic diagram of the internal structure of a part of the shell; Figure 5 is a schematic diagram of the structure of the gear ring; Figure 6 It is a structural schematic diagram of the oil receiving part; Figure 7 for Figure 6 Schematic diagram of the structure from the left perspective.
[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Shell 1; Oil receiving member 2, second oil through hole 21, third oil through hole 22, arc surface 23; Gear ring 3, first oil hole 31; Cylindrical gear 4, annular groove 5, planetary gear 6, boss 7, screw 8. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.
[0018] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.
[0019] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.
[0020] Embodiment 1 A planetary gear reducer, see Figure 1 , Figure 4 , including a housing 1, and an oil receiving member 2 and a ring gear 3 located in the housing 1. The oil receiving member 2 receives the lubricating oil thrown out from the upper part of the cylindrical gear 4 in the inner cavity of the housing 1, so that a part of the lubricating oil in the oil receiving member 2 is used to lubricate the outer circumferential surface of the ring gear 3, and the other part of the lubricating oil enters the inner wall of the ring gear 3 along the first oil through hole 31 in the circumferential direction of the ring gear 3 through the annular groove 5 on the inner wall of the housing 1 to lubricate the planetary gear 6. The new oil circuit design of this embodiment allows the reducer to receive the lubricating oil thrown out from the upper part of the cylindrical gear 4 during operation, and use the lubricating oil to lubricate the ring gear 3 and the planetary gear 6, on the one hand, avoiding the situation where the lubricating oil is thrown out and the lubricating oil is reduced; on the other hand, it improves the lubricating effect of the ring gear 3 and the planetary gear 6, prevents wear and burning caused by poor lubrication when the vehicle is running at high speed and for a long time, and extends their service life.
[0021] More specifically, see Figure 3 The inner side of the gear ring 3 is meshed with the planetary gear 6, so the lubricating oil enters the inner side of the gear ring 3 through the outside of the gear ring 3 to lubricate the planetary gear 6 meshed with the gear ring 3.
[0022] For example, see Figure 4 The annular groove 5 is formed by a concave inner wall of the housing 1 , and its opening direction faces the gear ring 3 .
[0023] In the specific implementation process, in order not to change the overall structure of the original reducer, refer to Figure 1 , Figure 2 The oil receiving piece 2 is arranged on the boss 7 on the inner wall of the housing 1 and is located above the ring gear 3; the top end surface of the oil receiving piece 2 is located below the top end surface of the cylindrical gear 4, and the upper end surface of the oil receiving piece 2 is opened to receive the lubricating oil thrown out from the cylindrical gear 4.
[0024] More specifically, see Figure 1 , Figure 3 , Figure 6 The oil receiving member 2 is a rectangular parallelepiped with an opening at the top. To facilitate oil collection, the length direction of the oil receiving member 2 is the same as the width direction of the cylindrical gear 4 and the gear ring 3, and there is a gap between the end of the oil receiving member 2 close to the cylindrical gear 4 and the outer wall of the cylindrical gear 4; Further, see Figure 1 The boss 7 is located at the upper part of the annular groove 5. In order to improve the stability of the oil receiving part 2, two bosses 7 are provided, and the annular groove 5 is located between the two bosses 7 and connected to the oil receiving part 2 by a screw 8, so as to facilitate the later replacement of the oil receiving part 2.
[0025] In the specific implementation process, see Figure 3 There is a gap between the bottom end surface of the oil receiving member 2 and the upper outer circumferential surface of the gear ring 3, and the second oil through hole 21 on the oil receiving member 2 is opposite to the gap, so that part of the lubricating oil in the oil receiving member 2 flows to the outer circumferential surface of the upper part of the gear ring 3 through the second oil through hole 21. That is, there is no second oil through hole 21 on the side of the oil receiving member 2 close to the cylindrical gear 4 (see Figure 1 , Figure 6 ), so that the lubricating oil enters the oil receiving member 2 and flows to the other end, and flows from the second oil through hole 21 to the outer circumferential surface of the upper part of the gear ring 3 to lubricate it.
[0026] More specifically, see Figure 3 , Figure 6 A third oil hole 22 is provided on the oil receiving member 2 on one side close to the boss 7, and the third oil hole 22 is communicated with the annular groove 5, so that a part of the lubricating oil in the oil receiving member 2 enters the annular groove 5 through the third oil hole 22, and while lubricating the outer cylindrical surface of the gear ring 3, the part of the lubricating oil can be continuously transported to the planetary gear 6 through the first oil hole 31 to lubricate it.
[0027] In order for the lubricating oil in the oil receiving member 2 to smoothly enter the annular groove 5 through the third oil through hole 22, see Figure 6 , Figure 7 The third oil hole 22 is arranged at the junction of the adjacent side wall and the bottom wall of the oil receiving member 2, that is, the lower and higher ends of the third oil hole 22 are respectively located on the bottom wall and the side wall of the oil receiving member 2.
[0028] It should be noted that, combined with Figure 1-Figure 4 The annular groove 5 is opposite to the outer circumferential surface of the gear ring 3 to form a channel for the flow of lubricating oil, and the circular center line of the annular groove 5 in the width direction coincides with the circular center line of the gear ring 3 in the width direction; in order to allow the lubricating oil in the channel to smoothly enter the first oil hole 31 and lubricate the portion of the gear ring 3 opposite to the annular groove 5, the width of the annular groove 5 is smaller than the width of the outer circumferential surface of the gear ring 3, but larger than the diameter of the first oil hole 31.
[0029] Combination Figure 1 , Figure 6In order to effectively lubricate both sides of the upper part of the gear ring 3 in the width direction, several groups of the second oil holes 21 are arranged along the width direction of the gear ring 3. That is, the left and right sides of the upper part of the gear ring 3 in the width direction are respectively provided with the second oil holes 21; and in order to smoothly move the lubricating oil in the oil receiving member 2 to the end away from the cylindrical gear 4, the number of holes in the group of second oil holes 21 close to the cylindrical gear 4 is less than the number of holes in the group of second oil holes 21 away from the cylindrical gear 4, and several groups of the second oil holes 21 are arranged in a staggered manner; For example, in the direction from the cylindrical gear 4 to the gear ring 3, the oil receiving member 2 is provided with a first group of second oil holes, a second group of second oil holes, and a third group of second oil holes in sequence, and the number of holes is 2, 2, and 3 in sequence (see Figure 6 ); For example, the three second oil holes in the third group are arranged at intervals along the circumferential direction of the ring gear 3.
[0030] In the specific implementation process, see Figure 7 In order to allow the lubricating oil in the oil receiving member 2 to smoothly enter the annular groove 5 from the third oil through hole 22, the bottom end surface of the oil receiving member 2 is an arcuate surface 23 to match the outer circumferential surface of the upper portion of the gear ring 3. At the same time, the height of the second oil through hole 21 is greater than the height of the third oil through hole 22, so that the lubricating oil in the oil receiving member 2 moves from the second oil through hole 21 to the third oil through hole 22, that is, the lubricating oil in the oil receiving member 2 moves from the higher end to the lower end.
[0031] The embodiment of the present invention is achieved as follows: 1. When the reducer is working, the cylindrical gear 4 rotates, and the lubricating oil in the inner cavity of the housing 1 is thrown into the oil receiving member 2 under the action of centrifugal force; 2. A portion of the lubricating oil in the oil receiving member 2 passes through the second oil hole 21 to lubricate the outer circumferential surface of the upper portion of the ring gear 3, and another portion of the lubricating oil enters the annular groove 5 through the third oil hole 22. When lubricating the outer circumferential surface of the portion of the ring gear 3 corresponding to the annular groove 5, the lubricating oil enters the inner wall through the first oil hole 31 to lubricate the planetary gear 6 meshing with the ring gear 3.
[0032] The newly added oil circuit of the present invention utilizes the lubricating oil inside the housing to lubricate the devices inside the housing (such as the ring gear and the planetary gear) without changing the overall structure of the reducer. On the one hand, it avoids the reduction of the reducer due to the lubricating oil being thrown out by the cylindrical gear during movement. On the other hand, it effectively prevents the occurrence of wear and burning caused by poor lubrication when the vehicle runs at high speed or for a long time.
[0033] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0034] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A planetary gear reducer, characterized in that: The invention comprises a housing (1), an oil receiving piece (2) and a gear ring (3) located in the housing (1), wherein the oil receiving piece (2) receives lubricating oil thrown out from the upper part of a cylindrical gear (4) in the inner cavity of the housing (1), so that a part of the lubricating oil in the oil receiving piece (2) is used to lubricate the outer circumferential surface of the gear ring (3), and another part of the lubricating oil enters the inner wall of the gear ring (3) along a first oil through hole in the circumferential direction of the gear ring (3) through an annular groove (5) on the inner wall of the housing (1) to lubricate the planetary gear (6).
2. A planetary gear reducer according to claim 1, characterized in that: The oil receiving member (2) is arranged on a boss (7) on the inner wall of the housing (1) and is located above the gear ring (3); The top end surface of the oil receiving piece (2) is located below the top end surface of the cylindrical gear (4), and the upper end surface of the oil receiving piece (2) is opened to receive lubricating oil thrown out from the cylindrical gear (4).
3. A planetary gear reducer according to claim 2, characterized in that: There is a gap between the bottom end surface of the oil receiving piece (2) and the upper portion of the outer circumferential surface of the gear ring (3), and the second oil through hole (21) on the oil receiving piece (2) is opposite to the gap, so that a portion of the lubricating oil in the oil receiving piece (2) flows through the second oil through hole (21) to the upper outer circumferential surface of the gear ring (3).
4. A planetary gear reducer according to claim 3, characterized in that: A third oil through hole (22) is provided on a side of the oil receiving member (2) close to the boss (7), and the third oil through hole (22) is in communication with the annular groove (5).
5. A planetary gear reducer according to claim 4, characterized in that: The annular groove (5) is opposite to the outer circumferential surface of the gear ring (3) to form a channel for the flow of lubricating oil, and the center line of the annular groove (5) in the width direction coincides with the center line of the gear ring (3) in the width direction.
6. A planetary gear reducer according to claim 5, characterized in that: The width of the annular groove (5) is smaller than the width of the outer circumferential surface of the gear ring (3).
7. A planetary gear reducer according to claim 4, characterized in that: The bottom end surface of the oil receiving piece (2) is an arc-shaped surface so as to match the outer circumferential surface of the upper portion of the gear ring (3).
8. A planetary gear reducer according to claim 7, characterized in that: The height of the second oil hole (21) is greater than the height of the third oil hole (22), so that the lubricating oil in the oil receiving member (2) moves from the direction of the second oil hole (21) to the direction of the third oil hole (22).
9. A planetary gear reducer according to claim 4, characterized in that: The second oil holes (21) are provided in a plurality of groups along the width direction of the gear ring (3).
10. The planetary gear reducer according to claim 1, characterized in that: The inner side of the ring gear (3) is meshed with the planetary gear (6).