Spline lubricating structure of transmission system of mining transport vehicle

Abstract

The utility model provides a spline lubrication structure of a transmission system of a mining transport vehicle, which comprises a traction motor, the traction motor comprises a traction motor output shaft, the traction motor output shaft is connected with one end of a spline connecting sleeve, the other end of the spline connecting sleeve is connected with one end of a speed reducer input shaft, and an axial through hole channel is arranged in the speed reducer input shaft. A sun gear is coaxially arranged at the other end of the speed reducer input shaft, an oil guide hole is formed in the sun gear, the sun gear is axially connected with an oil guide end cover in an aligned mode, an oil guide groove is formed in the oil guide end cover, and the oil guide hole, the oil guide groove and one end of a hole channel are communicated with one another. In addition, the continuity and the uniformity of the lubricating process can be guaranteed through the gap design in the spline connecting sleeve, the lubricating effect is guaranteed, meanwhile, due to the fact that the number of used bolts is small, the mounting and dismounting processes are simplified, the complexity of a lubricating system is reduced, and the reliability and the maintenance convenience of the whole transmission system are improved.

Description

Technical Field

[0001] The utility model belongs to the field of mining transport vehicles and relates to a spline lubrication structure, mainly to a spline lubrication structure of a transmission system of a mining transport vehicle. Background Art

[0002] With the booming global and domestic economies, the demand for coal, as well as ferrous and nonferrous metal ores, has continued to rise both domestically and internationally. This trend has spurred the development of large-scale mining haulers, which emerged as the times progressed. Initially, mining areas used traditional mechanical mining haulers, but as demand grew, large-tonnage mining haulers began to enter mining areas and became the mainstream.

[0003] Traditional mechanical mining haulers face limitations in large-tonnage applications. To overcome these limitations, electric-driven mining haulers have been introduced. These vehicles are renowned for their large tonnage, powerful power, excellent gradeability, and high haul efficiency. Despite their modest speeds, they offer impressive quality and utilization. These characteristics have made them a primary transportation tool in open-pit mines, significantly reducing mining costs and meeting the needs of mining operations both domestically and internationally.

[0004] From a transmission system perspective, the application of electric drive technology in ultra-large mining haulers has already taken a dominant position in this market segment due to its unique advantages. With its high efficiency, stability, and ease of maintenance, electric drive systems provide powerful power support for large mining haulers, further promoting the modernization and efficiency of the mining industry.

[0005] Traditionally, key connections, such as flat keys and wedge keys, are used to connect traction motors to input shafts. These connections are simple and low-cost, but can lead to wear or damage due to stress concentration at the connection when subjected to high loads or high-speed rotation.

[0006] To improve the rigidity and load-bearing capacity of the connection while reducing stress concentration, spline connection technology came into being. Spline connection transmits torque between two shafts through a series of interlocking tooth structures. Its design allows for a larger contact area and more uniform torque distribution.

[0007] While spline connections are highly effective in mechanical transmission, they also face lubrication challenges. Without proper lubrication, the tooth structure of a spline connection, operating under high loads, can lead to increased wear at the spline connection, reducing transmission efficiency, especially in high-speed or heavy-load applications.

[0008] Traditional lubrication methods, such as oil bath lubrication or splash lubrication, are unable to meet the lubrication needs of spline connections due to uneven distribution of the lubricant or inadequate lubrication. In addition, these methods may cause other problems due to excessive lubricant or contamination. Summary of the Invention

[0009] In view of the shortcomings of the existing technology, the purpose of the present invention is to propose a spline lubrication structure for the transmission system of a mining transport vehicle to solve the technical problem that the spline lubrication structure in the existing technology is difficult to achieve both lubrication effect and structural simplification.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] A spline lubrication structure of a mining transport vehicle transmission system includes a traction motor, wherein the traction motor includes a traction motor output shaft, the traction motor output shaft is connected to one end of a spline connecting sleeve, the other end of the spline connecting sleeve is connected to one end of a reducer input shaft, and an axially through-going channel is provided in the reducer input shaft.

[0012] The other end of the reducer input shaft is coaxially provided with a sun gear, and the sun gear is provided with an oil guide hole, which is communicated with the hole channel.

[0013] The sun gear is connected to the oil guide end cover in an axially aligned manner. The oil guide end cover is provided with an oil guide groove which is communicated with the hole.

[0014] The present invention also has the following technical features:

[0015] The traction motor output shaft is provided with a first threaded hole on one side near the oil guide end cover, and a hexagonal flange bolt is provided in the first threaded hole, and one end of the hexagonal flange bolt is placed in the first threaded hole to limit the reducer input shaft, and a notch is provided on the inner surface of the end of one end of the reducer input shaft, and the notch is located at the other end of the channel, and a sun gear mounting sleeve is coaxially installed on the other end of the hexagonal flange bolt, and the sun gear mounting sleeve consists of a hollow first cylinder and a second cylinder, the first cylinder and the second cylinder have the same inner diameters, and there is a first gap between the inner surfaces of the first cylinder and the second cylinder and the hexagonal flange bolt, the side surface of the first cylinder contacts the outer surface of one side of the traction motor output shaft near the oil guide end cover, the outer surface of the second cylinder contacts the inner surface of one end of the notch, and there is a second gap between the outer surface of one side of the upper end of the second cylinder and the side surface of the notch, and the outer surface of the other side of the upper end of the second cylinder is connected to the sun gear positioning retaining ring.

[0016] The sun gear positioning ring is composed of a hollow third cylinder and a fourth cylinder. The inner diameters of the third cylinder and the fourth cylinder are the same. The outer surface of the third cylinder contacts the inner surface of the other end of the notch. The fourth cylinder is provided with a first inner hole. The middle end of one end of the reducer input shaft is provided with a second threaded hole. The outer diameter of the fourth cylinder is smaller than the outer diameter of the reducer input shaft. The inner diameter of the first inner hole is larger than the inner diameter of the second threaded hole. Bolts are provided in the first inner hole and the second threaded hole. The bolts tightly connect the end of the fourth cylinder and one end of the reducer input shaft. There is a third gap between the bolt and the inner surface of the first inner hole.

[0017] A fourth gap is formed among the first cylinder, the second cylinder, the third cylinder, the fourth cylinder, the traction motor output shaft, the reducer input shaft and the spline connection sleeve.

[0018] A first external spline is provided on one end of the traction motor output shaft connected to the spline connecting sleeve, a second external spline is provided on the outer surface of one end of the reducer input shaft, and an internal spline is provided on the inner surface of the spline connecting sleeve. The first external spline and the second external spline are connected through the internal spline.

[0019] A motor rotating shaft is arranged inside the traction motor output shaft.

[0020] The second inner holes are evenly distributed circumferentially on the oil guide end cover.

[0021] The oil guide end cover and the reducer input shaft are connected by bolts.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] (I) The structure of the oil guide groove and the oil guide hole leading to the channel in the utility model can effectively achieve double lubrication inside the spline connection sleeve, while ensuring the lubrication effect, simplifying the complexity of the lubrication system, and improving the reliability of the entire transmission system and the convenience of maintenance.

[0024] (II) The internal clearance design of the spline connection sleeve in the present invention can also ensure the continuity and uniformity of the lubrication process; the present invention ensures the directness and efficiency of lubrication by directly delivering lubricant to the spline connection area, reducing the wear caused by uneven lubrication. Since the lubrication is more precise and sufficient, the wear of the spline connection is significantly reduced, thereby extending the service life of the traction motor output shaft and the reducer input shaft.

[0025] (III) The present invention achieves continuous lubrication between the output shaft of the traction motor, the spline connection sleeve and the interior of the reducer input shaft within a limited installation space, effectively solving the problem of spline lubrication. In addition, since a smaller number of bolts are used, the installation and disassembly process is simplified.

[0026] (IV) The lubrication system design proposed in the present invention takes into account different working conditions and environmental conditions, has strong adaptability and flexibility, is easy to integrate with the existing mining transport vehicle transmission system, and can achieve performance improvement without large-scale modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the spline lubrication structure of the mining transport vehicle transmission system.

[0028] Figure 2 This is a schematic diagram of the connection between the traction motor output shaft and the reducer input shaft in the spline lubrication structure of the mining transport vehicle transmission system.

[0029] Figure 3 This is a schematic diagram of the axial alignment of the reducer input shaft and the oil guide end cover in the spline lubrication structure of the mining transport vehicle transmission system.

[0030] Figure 4 This is a three-dimensional diagram of the oil guide end cover in the spline lubrication structure of the mining transport vehicle transmission system.

[0031] The meanings of the various numbers in the figure are: 1-traction motor, 2-traction motor output shaft, 3-spline connecting sleeve, 4-reducer input shaft, 5-channel, 6-sun gear, 7-oil guide hole, 8-oil guide end cover, 9-oil guide groove, 10-first threaded hole, 11-hexagonal flange bolt, 12-notch, 13-sun gear mounting sleeve, 1301-first cylinder, 1302-second cylinder, 14-first gap, 15-second gap, 16-sun gear positioning retaining ring, 1601-third cylinder, 1602-fourth cylinder, 17-first inner hole, 18-second threaded hole, 19-bolt, 20-third gap, 21-fourth gap, 22-first external spline, 23-second external spline, 24-inner spline, 25-motor shaft, 26-second inner hole.

[0032] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0033] It should be noted that, unless otherwise specified, all devices and components in the present invention are devices and components known in the prior art.

[0034] In accordance with the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0035] Example:

[0036] This embodiment provides a spline lubrication structure for a mining transport vehicle transmission system, including a traction motor 1, such as Figure 1 and Figure 3 As shown, the traction motor 1 includes a traction motor output shaft 2, which is connected to one end of a spline connecting sleeve 3, and the other end of the spline connecting sleeve 3 is connected to one end of a reducer input shaft 4. An axially through-hole 5 is provided in the reducer input shaft 4.

[0037] like Figure 1 and Figure 3 As shown, the other end of the reducer input shaft 4 is coaxially provided with a sun gear 6, and the sun gear 6 is provided with an oil guide hole 7, which is connected to the channel 5;

[0038] like Figure 1 and Figure 3 As shown, the sun gear 6 is axially aligned and connected to the oil guide end cover 8 , and the oil guide end cover 8 is provided with an oil guide groove 9 , which is connected to the channel 5 .

[0039] like Figure 2 As shown, a first threaded hole 10 is provided inside the side of the traction motor output shaft 2 close to the oil guide end cover 8, and a hexagonal flange bolt 11 is provided in the first threaded hole 10. One end of the hexagonal flange bolt 11 is placed in the first threaded hole 10 to limit the reducer input shaft 4. A notch 12 is provided on the inner surface of the end of one end of the reducer input shaft 4. The notch 12 is located at the other end of the channel 5. The other end of the hexagonal flange bolt 11 is coaxially mounted with a sun gear mounting sleeve 13. The sun gear mounting sleeve 13 consists of a hollow first cylinder 1301 and a second cylinder 1302. The first cylinder 1301 and the second cylinder 1302 have the same inner diameter, and there is a first gap 14 between the inner surface of the first cylinder 1301 and the second cylinder 1302 and the hexagonal flange bolt 11, the side surface of the first cylinder 1301 contacts the outer surface of the side of the traction motor output shaft 2 close to the oil guide end cover 8, the outer surface of the second cylinder 1302 contacts the inner surface of one end of the notch 12, and there is a second gap 15 between the outer surface of one side of the upper end of the second cylinder 1302 and the side surface of the notch 12, and the outer surface of the other side of the upper end of the second cylinder 1302 is connected to the sun gear positioning retaining ring 16.

[0040] like Figure 2As shown, the sun gear positioning ring 16 is composed of a hollow third cylinder 1601 and a fourth cylinder 1602. The inner diameters of the third cylinder 1601 and the fourth cylinder 1602 are the same. The outer surface of the third cylinder 1601 contacts the inner surface of the other end of the notch 12. The fourth cylinder 1602 is provided with a first inner hole 17. The middle end of one end of the reducer input shaft 4 is provided with a second threaded hole 18. The outer diameter of the fourth cylinder 1602 is smaller than the outer diameter of the reducer input shaft 4. The inner diameter of the first inner hole 17 is larger than the inner diameter of the second threaded hole 18. Bolts 19 are provided in the first inner hole 17 and the first threaded hole 18. The bolts 19 tightly connect the fourth cylinder 1602 and the end of one end of the reducer input shaft 4. There is a third gap 20 between the bolt 18 and the inner surface of the first inner hole 16.

[0041] like Figure 2 As shown, a fourth gap 21 is formed between the first cylinder 1301 , the second cylinder 1302 , the third cylinder 1601 , the fourth cylinder 1602 , the traction motor output shaft 2 , the reducer input shaft 4 and the spline connection sleeve 3 .

[0042] like Figure 2 As shown, a first external spline 22 is provided on one end of the traction motor output shaft 2 connected to the spline connecting sleeve 3, a second external spline 23 is provided on the outer surface of one end of the reducer input shaft 4, and an internal spline 24 is provided on the inner surface of the spline connecting sleeve 3. The first external spline 22 and the second external spline 23 are connected through the internal spline 24.

[0043] like Figure 2 As shown, a motor rotating shaft 25 is provided inside the traction motor output shaft 2 .

[0044] like Figure 4 As shown, the second inner holes 26 are evenly distributed circumferentially on the oil guide end cover 8.

[0045] like Figure 4 As shown, the oil guide end cover 8 and the reducer input shaft 4 are connected by bolts 19, which can facilitate the subsequent disassembly of the reducer input shaft 4, making it convenient to add lubricating oil to the channel 5. At the same time, when the reducer input shaft 4 fails, it is also convenient to disassemble and repair.

[0046] Specifically in this embodiment, the spline connection sleeve 3 connects the traction motor output shaft 2 and the reducer input shaft 4 respectively, ensuring a close fit of the machinery.

[0047] Specifically in this embodiment, the oil guide groove 9 provided on the oil guide end cover 8 can guide the lubricating oil to the channel 5 in the reducer input shaft 4. By utilizing the axial floating principle of the reducer input shaft 4, the lubricating oil can smoothly reach the interior of the spline connection sleeve 3, thereby achieving continuous and effective lubrication of the spline connection part.

[0048] Specifically, in this embodiment, the sun gear 6 is connected to the oil guide end cover 8 in an axially aligned manner, ensuring that the lubricating oil can smoothly enter the oil guide groove 9 through the oil guide hole 7 and then flow into the channel 5 .

[0049] Specifically in this embodiment, the first external spline 22 and the second external spline 23 are connected by the internal spline 24, and the sun gear mounting sleeve 13 and the sun gear locating retaining ring 16 are tightly fixed by the bolts 19, which not only accurately determines the axial position of the reducer input shaft 4, but also allows a second gap 15 between the sun gear mounting sleeve 13 and the reducer input shaft 4, so that the reducer input shaft 4 can achieve axial micro-motion.

[0050] Specifically, in this embodiment, when the traction motor 1 generates output, the traction motor output shaft 2 rotates, which in turn drives the reducer input shaft 4, thereby causing the sun gear 6 and the oil guide cover 8 to rotate. As the sun gear 6 rotates, it draws some lubricating oil into the channel 5 through the oil guide holes 7 in its tooth grooves. Simultaneously, during operation of the transport vehicle, lubricating oil also flows into the channel 5 through the oil guide grooves 9. By leveraging the floating nature of the sun gear on the reducer input shaft 4, the lubricating oil can smoothly enter the interior of the splined connection sleeve 3.

Claims

1. A spline lubrication structure for a transmission system of a mining transport vehicle, comprising a traction motor (1), characterized in that: The traction motor (1) includes a traction motor output shaft (2), the traction motor output shaft (2) is connected to one end of a spline connection sleeve (3), the other end of the spline connection sleeve (3) is connected to one end of a reducer input shaft (4), and an axially through-going hole (5) is provided in the reducer input shaft (4); The other end of the reducer input shaft (4) is coaxially provided with a sun gear (6), the sun gear (6) is provided with an oil guide hole (7), and the oil guide hole (7) is connected to the hole (5); The sun gear (6) is axially aligned and connected to the oil guide end cover (8). The oil guide end cover (8) is provided with an oil guide groove (9), which is communicated with the hole (5).

2. The spline lubrication structure of the transmission system of a mining transport vehicle according to claim 1, characterized in that: A first threaded hole (10) is provided inside the side of the traction motor output shaft (2) close to the oil guide end cover (8), and a hexagonal flange bolt (11) is provided in the first threaded hole (10). One end of the hexagonal flange bolt (11) is placed in the first threaded hole (10) to limit the reducer input shaft (4). A notch (12) is provided on the inner surface of the end of one end of the reducer input shaft (4), and the notch (12) is located at the other end of the channel (5). A sun gear mounting sleeve (13) is coaxially installed on the other end of the hexagonal flange bolt (11). The sun gear mounting sleeve (13) consists of a hollow first cylinder (1301) and a second cylinder (1302). The inner diameters of the first cylinder (1301) and the second cylinder (1302) are the same; a first gap (14) exists between the inner surfaces of the first cylinder (1301) and the second cylinder (1302) and the hexagonal flange bolt (11); the side surface of the first cylinder (1301) contacts the outer surface of one side of the traction motor output shaft (2) close to the oil guide end cover (8); the outer surface of the second cylinder (1302) contacts the inner surface of one end of the notch (12); a second gap (15) exists between the outer surface of one side of the upper end of the second cylinder (1302) and the side surface of the notch (12); and the outer surface of the other side of the upper end of the second cylinder (1302) is connected to the sun gear positioning retaining ring (16); The sun gear positioning ring (16) is composed of a hollow third cylinder (1601) and a fourth cylinder (1602). The inner diameters of the third cylinder (1601) and the fourth cylinder (1602) are the same. The outer surface of the third cylinder (1601) contacts the inner surface of the other end of the notch (12). The fourth cylinder (1602) is provided with a first inner hole (17). The middle end of one end of the reducer input shaft (4) is provided with a second threaded hole. (18), the outer diameter of the fourth cylinder (1602) is smaller than the outer diameter of the reducer input shaft (4), the inner diameter of the first inner hole (17) is larger than the inner diameter of the second threaded hole (18), a bolt (19) is provided in the first inner hole (17) and the second threaded hole (18), the bolt (19) tightly connects the end of the fourth cylinder (1602) and one end of the reducer input shaft (4), and a third gap (20) exists between the bolt (19) and the inner surface of the first inner hole (17); A fourth gap (21) is formed between the first cylinder (1301), the second cylinder (1302), the third cylinder (1601), the fourth cylinder (1602), the traction motor output shaft (2), the reducer input shaft (4) and the spline connection sleeve (3).

3. The spline lubrication structure of the transmission system of a mining transport vehicle according to claim 1, characterized in that: A first external spline (22) is provided on one end of the traction motor output shaft (2) connected to the spline connection sleeve (3), a second external spline (23) is provided on the outer surface of one end of the reducer input shaft (4), an internal spline (24) is provided on the inner surface of the spline connection sleeve (3), and the first external spline (22) and the second external spline (23) are connected via the internal spline (24).

4. The spline lubrication structure of the transmission system of a mining transport vehicle according to claim 1, characterized in that: A motor rotating shaft (25) is provided inside the traction motor output shaft (2).

5. The spline lubrication structure of the transmission system of a mining transport vehicle according to claim 1, characterized in that: The oil guide end cover (8) is provided with second inner holes (26) uniformly distributed circumferentially.

6. The spline lubrication structure of the transmission system of a mining transport vehicle according to claim 1, characterized in that: The oil guide end cover (8) and the reducer input shaft (4) are connected via bolts (19).

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