Lubricating system of mine truck gearbox

Abstract

The invention discloses a lubricating system of a mine truck gearbox. The lubricating system is comprehensive in lubricating coverage range, simple in oil way design and convenient to maintain in the later period, the use risk is reduced, the lubricating efficiency is improved, the cost is reduced, and the reliability of the system is improved. The gearbox shell assembly comprises a main shell, an upper cover, a rear shell, a supporting plate and an end cover, and the main shell, the upper cover and the rear shell are spliced to form a gearbox cavity; the input shaft and the output shaft are coaxially arranged; the upper middle shaft and the power take-off shaft are coaxially arranged; the lower intermediate shaft and the oil pump power take-off shaft are coaxially arranged; and an oil pump; the input shaft and the output shaft are coaxially arranged in the middle of the gearbox cavity in the height direction, the upper intermediate shaft is located on the upper portion of the gearbox cavity in the height direction, and the lower intermediate shaft is located on the lower portion of the gearbox cavity in the height direction. The oil pump gear is connected with an inner rotor of the oil pump.

Description

Technical Field

[0001] The invention relates to the technical field of gearbox lubrication, and in particular to a lubrication system for a mining truck gearbox. Background Art

[0002] The lubricating oil in the gearbox has the functions of reducing friction, reducing wear, dissipating heat, cleaning, and preventing corrosion of the gearbox parts, which has an important impact on the performance and service life of the gearbox. If the gearbox's lubrication system does not cover all parts, especially the parts that were not originally immersed in the lubricating oil, or the lubricating oil circulation is unreasonable, it will seriously affect the heat dissipation of the gearbox and even cause the parts to burn in a short period of time. At the same time, if the rotating parts in the gearbox are not lubricated enough, the friction will increase, which will seriously affect the transmission efficiency of the gearbox.

[0003] As the speed and torque of the gearbox continue to increase, the requirements for the lubrication system are also getting higher and higher. However, the existing lubrication system has the problems of incomplete lubrication coverage of parts, inconvenient post-maintenance, and failure to consider abnormal lubrication under different working conditions such as vehicle uphill and downhill, which can easily lead to oil pipe blockage or oil leakage caused by excessive oil pressure. In addition, conventional lubrication systems generally require oil pipes, which not only need to be fixed in the gearbox, but also occupy a large space, which will affect the layout of other parts. In particular, the existing mining truck gearbox, its lubrication system occupies a large space, which leads to a large size of the entire gearbox, and some parts are not fully lubricated, resulting in wear. For this reason, it is urgent to develop a reliable mining truck gearbox lubrication system. Summary of the invention

[0004] In view of the above problems, the present invention provides a lubrication system for a mining truck gearbox, which has comprehensive lubrication coverage, simple oil circuit design, and convenient later maintenance, reduces the risk of use, improves lubrication efficiency, reduces costs, and improves system reliability.

[0005] A lubrication system for a mining truck gearbox, characterized in that it comprises:

[0006] The gearbox housing assembly includes a main housing, an upper cover, a rear housing, a support plate, and an end cover. The main housing, the upper cover, and the rear housing are assembled to form a gearbox cavity. The support plate is used to set corresponding bearing positioning holes so that each shaft can be reliably positioned. The end cover is installed at the corresponding output position of the output shaft;

[0007] Coaxially arranged input shaft and output shaft;

[0008] Coaxially arranged upper intermediate shaft and power take-off shaft;

[0009] Coaxially arranged lower intermediate shaft and oil pump power take-off shaft;

[0010] and oil pumps;

[0011] The input shaft and the output shaft are coaxially arranged and located in the middle of the gearbox cavity in the height direction, the upper intermediate shaft is located in the upper part of the gearbox cavity in the height direction, and the lower intermediate shaft is located in the lower part of the gearbox cavity in the height direction. The oil pump power take-off shaft is meshed and connected to the oil pump gear through the oil pump power take-off gear, and the oil pump gear is connected to the inner rotor of the oil pump through the transmission shaft;

[0012] The support plate is provided with a first guide oil passage from bottom to top, the rear housing is provided with a second guide oil passage from top to bottom connected to the oil collecting ring corresponding to the output shaft, the upper cover is provided with a first oil injection oil passage and a third guide oil passage along the axial direction, the starting end of the first oil injection oil passage is connected to the first guide oil passage, the starting end of the third guide oil passage is connected to the first guide oil passage, the front end plate of the main housing is provided with a fourth guide oil passage from top to bottom, the fourth guide oil passage is respectively connected to the respective bearing positions located above the lubricating oil level on the corresponding front end plate, the starting end of the fourth guide oil passage is connected to the third guide oil passage, the first oil injection oil passage is provided with a plurality of spray holes, a central diffusion oil passage is formed between the input shaft and the output shaft, the central diffusion oil passage includes a central shaft oil passage and a radial distribution oil passage, the central diffusion oil passage is connected to the gears, spacers and bearings on the input shaft and the output shaft, the oil collecting ring introduces the lubricating oil guided from the second guide oil passage into the inlet of the central shaft oil passage, the lower intermediate shaft and the oil pump power take-off shaft are immersed below the lubricating oil level;

[0013] An oil filter is arranged at the bottom center of the gearbox housing, and the oil filter is connected to the oil inlet of the oil pump through a pipeline, and the oil outlets of all oil pumps are connected to the inlet of the first guide oil circuit through pipelines.

[0014] It is further characterized by:

[0015] The oil filter is equipped with an overflow valve to prevent oil leakage caused by oil pipe blockage or excessive oil pressure when the vehicle is going uphill or downhill;

[0016] The main housing is provided with an oil filter maintenance window corresponding to the lower part of the oil filter. The oil filter maintenance window is a sealing cover plate structure. When the oil filter maintenance is required, the sealing cover plate structure is opened to replace the oil filter or the lubricating oil.

[0017] An external cooling device is also provided at the bottom of the main shell body corresponding to the position directly below the oil pump. The oil pumped out by the oil pump is connected to the lubricating oil input port of the external cooling device through a pipeline, and the lubricating oil output port of the external cooling device is further connected to the inlet of the first guide oil circuit through a pipeline, which enables reliable and rapid cooling according to the oil temperature of the lubricating oil, ensuring that the lubricating oil is lubricated and cooled at a reasonable temperature.

[0018] The present invention lubricates the entire gearbox by means of rotating oil stirring and oil pump actively pumping oil. The oil pump gear is connected to the inner rotor of the oil pump through the transmission shaft, so that when the gearbox is working, the oil pump is also working at the same time. The lubricating oil at the bottom of the gearbox cavity is sucked into the oil pump after passing through the oil filter. The oil pump then pumps the lubricating oil into the upper cover and the rear housing of the gearbox. The first oil injection oil circuit of the upper cover sprays oil to the gears and bearings on the upper intermediate shaft which are at a higher position and cannot stir the oil. On the other hand, the third guide oil circuit inside the upper cover guides the oil to the fourth guide oil circuit of the front end plate to lubricate the corresponding bearings and lubricate the bearings which cannot be sprayed with oil. The second guide oil circuit in the rear housing is connected to the oil collecting ring on the output shaft. The lubricating oil enters the center shaft oil circuit through the oil collecting ring, and then reaches parts such as gears, spacers, and bearings through the radially distributed oil circuits on the input shaft and output shaft. The lower parts in the gearbox are already immersed in the lubricating oil and do not require active lubrication. This lubrication system covers all parts that need lubrication, and covers bearings that are relatively deep on the input and output shafts. The oil filter is located in the middle of the bottom of the gearbox, and the oil pump can draw oil through the oil filter regardless of whether the vehicle is going uphill or downhill. Its lubrication coverage is comprehensive, the oil circuit design is simple, and later maintenance is convenient, which reduces the risk of use, improves lubrication efficiency, reduces costs, and improves system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the oil circuit arrangement of the present invention;

[0020] Figure 2 It is a transmission connection schematic diagram of the present invention;

[0021] The names corresponding to the serial numbers in the figure are as follows:

[0022] First guide oil circuit 1, second guide oil circuit 2, first oil injection oil circuit 3, third guide oil circuit 4, fourth guide oil circuit 5, center axis oil circuit 6, radial distribution oil circuit 7;

[0023] Gearbox housing assembly 10, main housing 11, upper cover 12, rear housing 13, support plate 14, end cover 15, input shaft 20, output shaft 30, oil collecting ring 31, upper intermediate shaft 40, power take-off shaft 50, lower intermediate shaft 60, oil pump power take-off shaft 70, oil pump power take-off gear 71, oil pump 80, oil pump gear 81, gearbox cavity 90, oil filter 100, oil filter maintenance window 110, external cooling device 120. DETAILED DESCRIPTION

[0024] A lubrication system for a mining truck gearbox, see Figure 1-Figure 2 , which includes a gearbox housing assembly 10; a coaxially arranged input shaft 20 and an output shaft 30; a coaxially arranged upper intermediate shaft 40 and a power take-off shaft 50; a coaxially arranged lower intermediate shaft 60 and an oil pump power take-off shaft 70; and an oil pump 80;

[0025] The gearbox housing assembly 10 includes a main housing 11, an upper cover 12, a rear housing 13, a support plate 14, and an end cover 15. The main housing 11, the upper cover 12, and the rear housing 13 are assembled to form a gearbox cavity 90. The support plate 14 is used to set corresponding bearing positioning holes so that each shaft can be reliably positioned. The end cover 15 is installed at the corresponding output position of the output shaft 30.

[0026] The input shaft 20 and the output shaft 30 are located in the middle of the gearbox cavity 90 in the height direction, the upper intermediate shaft 40 and the power take-off shaft 50 are located in the upper part of the gearbox cavity 90 in the height direction, the lower intermediate shaft 60 and the oil pump power take-off shaft 70 are located in the lower part of the gearbox cavity 90 in the height direction, the oil pump power take-off shaft 70 is meshed and connected to the oil pump gear 81 through the oil pump power take-off gear 71, and the oil pump gear 81 is connected to the inner rotor of the oil pump 80 through the transmission shaft;

[0027] The support plate 14 is provided with a first guide oil passage 1 from bottom to top, the rear housing 13 is provided with a second guide oil passage 2 from top to bottom connected to the oil collecting ring 31 corresponding to the output shaft 30, the upper cover 12 is provided with a first oil injection passage 3 and a third guide oil passage 4 along the axial direction, the starting end of the first oil injection passage 3 is connected to the first guide oil passage 1, and the starting end of the third guide oil passage 4 is connected to the first guide oil passage 1, and the front end plate of the main housing 11 is provided with a fourth guide oil passage 5 from top to bottom, and the fourth guide oil passage 5 is respectively connected to the respective corresponding oil guides located on the front end plate. At the bearing position above the liquid surface, the starting end of the fourth guide oil passage 5 is connected to the third guide oil passage 4, the first oil spray passage 3 is provided with a plurality of spray holes, a central diffusion oil passage is formed between the input shaft 20 and the output shaft 30, the central diffusion oil passage includes a central shaft oil passage 6 and a radial distribution oil passage 7, the central diffusion oil passage 7 is connected to the gears, spacers and bearings on the input shaft 20 and the output shaft 30, the oil collecting ring 31 introduces the lubricating oil guided from the second guide oil passage 2 to the inlet of the central shaft oil passage 6, the lower intermediate shaft 60 and the oil pump power take-off shaft 70 are immersed below the lubricating oil surface;

[0028] An oil filter 100 is provided at the bottom center of the gearbox housing 10 , and the oil filter 100 is connected to the oil inlet of the oil pump 80 through a pipeline, and the oil outlet of the oil pump 80 is connected to the inlet of the first guide oil circuit 1 through a pipeline.

[0029] In a specific embodiment, the oil filter 100 is equipped with a relief valve to prevent oil leakage caused by oil pipe blockage or excessive oil pressure during the vehicle's uphill and downhill driving;

[0030] The main housing 11 is provided with an oil filter maintenance window 110 corresponding to the lower portion of the oil filter 100. The oil filter maintenance window 110 is a sealing cover plate structure. When the oil filter maintenance is required, the sealing cover plate structure is opened to replace the oil filter 100 or replace the lubricating oil.

[0031] An external cooling device 120 is also provided at the bottom of the main housing 11, corresponding to the position directly below the oil pump 80. The oil pumped out by the oil pump 80 is connected to the lubricating oil input port of the external cooling device 120 through a pipeline, and the lubricating oil output port of the external cooling device 120 is further connected to the inlet of the first guide oil circuit 1 through a pipeline, which enables reliable and rapid cooling according to the lubricating oil temperature, ensuring that the lubricating oil is lubricated and cooled at a reasonable temperature.

[0032] The present invention lubricates the entire gearbox by means of rotating oil stirring and oil pump actively pumping oil. The oil pump gear is connected to the inner rotor of the oil pump through the transmission shaft, so that when the gearbox is working, the oil pump is also working at the same time. The lubricating oil at the bottom of the gearbox cavity is sucked into the oil pump after passing through the oil filter. The oil pump then pumps the lubricating oil into the upper cover and the rear housing of the gearbox. The first oil injection oil passage of the upper cover sprays oil to the gears and bearings on the upper intermediate shaft which are located at a higher position and cannot stir the oil. On the other hand, the third guide oil passage inside the upper cover guides the oil to the fourth guide oil passage of the front end plate to lubricate the corresponding bearings and lubricate the bearings which cannot be sprayed with oil. The second guide oil passage in the rear housing The oil circuit is connected to the oil collecting ring on the output shaft. The lubricating oil enters the central shaft oil circuit through the oil collecting ring, and then reaches the gears, spacers, bearings and other parts through the radially distributed oil circuits on the input shaft and the output shaft. The parts at a lower position in the gearbox are immersed in the lubricating oil and do not need active lubrication. This lubrication system covers all parts that need lubrication, and covers the bearings at a relatively deep position of the input shaft and the output shaft. The oil filter is located in the middle of the bottom of the gearbox. Whether the vehicle is going uphill or downhill, the oil pump can suck oil through the oil filter. In addition, an oil filter maintenance window is provided on the bottom cover plate near the oil filter to facilitate the replacement and maintenance of the oil filter. The present invention simplifies the oil circuit structure, eliminates the oil pipe, and performs an integrated design. The lubricating oil directly reaches the parts through the internal oil circuit of the shell, saving cost and space. In addition, the lubrication system is provided with an interface for an external cooling device. If the heat dissipation efficiency needs to be improved later, a separate cooling device can be directly connected externally.

[0033] Its beneficial effects are as follows:

[0034] 1. This lubrication system covers all friction parts such as bearings, gears, and spacers;

[0035] 2. Considering the convenience of oil absorption when the vehicle is going uphill or downhill, the oil filter is arranged in the center and equipped with a relief valve to prevent oil leakage caused by excessive oil pressure due to oil pipe blockage or excessive speed;

[0036] 3. It has a sealed cover structure to facilitate oil filter replacement and after-sales maintenance;

[0037] 4. The upper cover integrates the oil circuit and eliminates the oil pipe, which reduces costs and increases reliability;

[0038] 5. The lubricating oil passes through the oil collecting ring on the output shaft and enters the shaft to lubricate all the spacers, gears and bearings;

[0039] 6. An external cooling interface is reserved to facilitate later cooling needs and install a heat exchanger.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A lubrication system for a mining truck gearbox, characterized in that: It includes: The gearbox housing assembly includes a main housing, an upper cover, a rear housing, a support plate, and an end cover. The main housing, the upper cover, and the rear housing are assembled to form a gearbox cavity. The support plate is used to set corresponding bearing positioning holes so that each shaft can be reliably positioned. The end cover is installed at the corresponding output position of the output shaft; Coaxially arranged input shaft and output shaft; Coaxially arranged upper intermediate shaft and power take-off shaft; Coaxially arranged lower intermediate shaft and oil pump power take-off shaft; and oil pumps; The input shaft and the output shaft are coaxially arranged and located in the middle of the gearbox cavity in the height direction, the upper intermediate shaft is located in the upper part of the gearbox cavity in the height direction, and the lower intermediate shaft is located in the lower part of the gearbox cavity in the height direction. The oil pump power take-off shaft is meshed and connected to the oil pump gear through the oil pump power take-off gear, and the oil pump gear is connected to the inner rotor of the oil pump through the transmission shaft; The support plate is provided with a first guide oil passage from bottom to top, the rear housing is provided with a second guide oil passage from top to bottom connected to the oil collecting ring corresponding to the output shaft, the upper cover is provided with a first oil injection oil passage and a third guide oil passage along the axial direction, the starting end of the first oil injection oil passage is connected to the first guide oil passage, the starting end of the third guide oil passage is connected to the first guide oil passage, the front end plate of the main housing is provided with a fourth guide oil passage from top to bottom, the fourth guide oil passage is respectively connected to the respective bearing positions located above the lubricating oil level on the corresponding front end plate, the starting end of the fourth guide oil passage is connected to the third guide oil passage, the first oil injection oil passage is provided with a plurality of spray holes, a central diffusion oil passage is formed between the input shaft and the output shaft, the central diffusion oil passage includes a central shaft oil passage and a radial distribution oil passage, the central diffusion oil passage is connected to the gears, spacers and bearings on the input shaft and the output shaft, the oil collecting ring introduces the lubricating oil guided from the second guide oil passage into the inlet of the central shaft oil passage, the lower intermediate shaft and the oil pump power take-off shaft are immersed below the lubricating oil level; An oil filter is arranged at the bottom center of the gearbox housing, and the oil filter is connected to the oil inlet of the oil pump through a pipeline, and the oil outlets of all oil pumps are connected to the inlet of the first guide oil circuit through pipelines.

2. The lubrication system of a mining truck gearbox according to claim 1, characterized in that: The oil filter is equipped with a relief valve.

3. The lubrication system of a mining truck gearbox according to claim 1, characterized in that: The main housing is provided with an oil filter maintenance window corresponding to the lower portion of the oil filter, and the oil filter maintenance window is a sealing cover plate structure.

4. The lubrication system of a mining truck gearbox according to claim 1, characterized in that: An external cooling device is also provided at the bottom of the main shell corresponding to the position directly below the oil pump. The oil pumped out by the oil pump is connected to the lubricating oil input port of the external cooling device through a pipeline, and the lubricating oil output port of the external cooling device is further connected to the inlet of the first guide oil circuit through a pipeline.

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