A lubricating oil circuit structure of a gear box

Abstract

The invention discloses a lubricating oil circuit structure of a gearbox, which makes the gearbox structure compact and can lubricate the bearings and gears of the gearbox reasonably. The structure comprises an upper box body, a lower box body and an oil pipe system, a low-speed shaft and a high-speed gear shaft are installed between the upper box body and the lower box body through bearings, an input gear is installed on the low-speed shaft, and the input gear is meshed with the high-speed gear shaft, an oil inlet is provided at one end of the lower box body, an oil outlet and an oil filling port are provided on the inner wall of the lower box body, an annular bearing oil inlet groove is provided on the upper box body and the lower box body corresponding to the bearing, the oil inlet is connected to the oil outlet, and the oil filling port is connected to the bearing oil inlet groove, the oil pipe system comprises an oil inlet pipe, an oil outlet pipe, an upper gear oil spray pipe and a lower gear oil spray pipe, the oil inlet pipe is connected to the oil outlet, the oil outlet pipe is connected to the oil inlet pipe and the oil filling port, the upper gear oil spray pipe sprays oil from the upper side toward the meshing position of the input gear and the high-speed gear shaft, and the lower gear oil spray pipe sprays oil from the lower side toward the meshing position of the input gear and the high-speed gear shaft.

Description

Technical Field

[0001] The invention relates to the technical field of gear transmissions, and in particular to a lubricating oil circuit structure of a gear box. Background Art

[0002] The speed gearbox is an indispensable key component for the implementation of mechanical transmission in the equipment manufacturing industry. Because gear transmission has the advantages of high transmission accuracy, wide applicable transmission power range, and can realize the transmission between any two axes in space such as parallel axes, intersecting axes, and staggered axes, gear transmission has been widely used in the development of metallurgy, electric power, construction machinery, energy and other industries.

[0003] A complete gearbox is often composed of key components such as the box body, gears, bearings and shafts. If the gear meshing transmission has a poor lubrication effect, it will cause problems such as increased gear transmission power loss, high noise, and large vibration, and even damage the gears in severe cases. If the bearings are not lubricated well, the surface temperature of the bearing pads will rise sharply, which can easily burn the bearings. In addition, because the gearbox lubrication requires the layout of the oil circuit, if the layout is inappropriate, the entire gearbox structure will be messy, and even seriously affect the maintenance of the gearbox. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a lubricating oil circuit structure of a gear box, so that the gear box structure is compact and the bearings and gears of the gear box can be lubricated reasonably.

[0005] The object of the present invention is achieved in that:

[0006] A lubricating oil circuit structure of a gearbox comprises an upper case body and a lower case body of the gearbox, a low-speed shaft is installed between the upper case body and the lower case body via a low-speed front bearing and a low-speed rear bearing, a high-speed gear shaft is installed between the upper case body and the lower case body via a high-speed front bearing and a high-speed rear bearing, an input gear is installed on the low-speed shaft, and the input gear is meshed with the high-speed gear shaft,

[0007] An oil inlet is provided at one end of the lower box body, and oil outlets and oil filling ports are symmetrically provided on both sides of the inner wall of the lower box body. Annular bearing oil inlet grooves are provided on the upper box body and the lower box body corresponding to the low-speed front bearing, the low-speed rear bearing, the high-speed front bearing, and the high-speed rear bearing for lubricating the bearings. The oil outlet is adjacent to the oil inlet, and the oil inlet is connected to the two oil outlets through an oil inlet branch. The oil filling port is located between the low-speed shaft and the high-speed gear shaft, and the oil filling port is connected to the two bearing oil inlet grooves on the corresponding side through an oil filling branch. The oil pipe system is also included, and the oil pipe system has two symmetrically arranged inlet pipes. An oil pipe, two oil outlet pipes, and an upper gear oil spray pipe and a lower gear oil spray pipe, the two oil inlet pipes are respectively connected to the oil outlet ports on the corresponding sides, and are used to output lubricating oil to the oil pipe system, the two oil outlet pipes are respectively connected to the oil inlet pipe and the oil filling port on the corresponding sides, and are used to inject lubricating oil into the bearing oil inlet groove through the oil filling branch, the upper gear oil spray pipe and the lower gear oil spray are respectively connected to the two oil inlet pipes, the upper gear oil spray pipe is used to spray oil from above to the meshing position of the input gear and the high-speed gear shaft, and the lower gear oil spray pipe is used to spray oil from below to the meshing position of the input gear and the high-speed gear shaft.

[0008] Preferably, an oil pump is installed on the lower housing, and the oil pump shaft of the oil pump extends into the lower housing. An oil pump driven gear is provided on the oil pump shaft of the oil pump, and an oil pump driving gear is provided on the low-speed shaft. The oil pump driving gear is meshed with the oil pump driven gear to drive the oil pump, and the oil pump is used to pump the oil in the lower housing into the oil inlet to form a circulation.

[0009] Preferably, the lubrication space of the oil pump shaft is connected to the bearing oil inlet groove of the low-speed rear bearing through an oil inlet channel, and a cut-off nozzle is threadedly fitted at one end of the oil inlet channel adjacent to the bearing oil inlet groove. The cut-off nozzle is provided with an oil hole along the axial direction to play a throttling role.

[0010] Preferably, the oil inlet is located at the end where the low-speed shaft is located, the upper gear oil injection pipe and the lower gear oil injection pipe are located at the end where the high-speed gear shaft is located, the upper gear oil injection pipe is located on the outside above the high-speed gear shaft, and the lower gear oil injection pipe is located on the inside below the high-speed gear shaft.

[0011] Preferably, the oil inlet pipe / oil outlet pipe is connected to the oil outlet / oil filling port via a ferrule-type articulated pipe joint.

[0012] Preferably, the upper gear oil spray pipe and the lower gear oil spray pipe are respectively provided with a plurality of spray holes for spraying lubricating oil.

[0013] Due to the adoption of the above technical scheme, the present invention can reasonably lubricate the bearings and gears of the gearbox, prevent the bearings and gears from being damaged to varying degrees due to improper lubrication, and at the same time make the gearbox structure compact to avoid affecting the gearbox maintenance due to the oil circuit layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an appearance diagram of a gear box of the present invention;

[0015] Figure 2 It is a horizontal section view of the oil inlet of the gear box of the present invention;

[0016] Figure 3a It is a partial cross-sectional view of the bearing oil inlet oil circuit of the gear box lubrication oil circuit of the present invention;

[0017] Figure 3b It is a partial cross-sectional view of the oil circuit of the gear box oil pump of the present invention;

[0018] Figure 4 It is a partial cross-sectional view of the oil circuit of the gear box oil pump of the present invention;

[0019] Figure 5 This is a structural diagram of the lubricating oil pipe of the present invention.

[0020] Reference numerals

[0021] The attached drawings include: lower box 1, lubricating oil pipe 2, low-speed shaft 3, low-speed front bearing 4, high-speed front bearing 5, high-speed gear shaft 6, high-speed front oil seal 7, high-speed rear bearing 8, high-speed rear oil seal 9, low-speed rear bearing 10, low-speed rear oil seal 11, oil pump 12, and oil pump shaft 13. DETAILED DESCRIPTION

[0022] See also Figure 1-Figure 5 , is an embodiment of a lubricating oil circuit structure of a gear box.

[0023] Figure 1 This is an appearance diagram of a gearbox of the present invention, which is a gearbox divided horizontally into upper and lower parts, and the upper and lower cases are connected by screws. Because the upper case needs to be disassembled when the gearbox is repaired, in order not to affect the repair, the present invention arranges the lubricating oil circuit entirely in the lower case, and the observation window is used to observe the gear meshing and oil injection lubrication conditions.

[0024] Figure 2 It is a horizontal section diagram of the oil inlet of the gearbox of the present invention, wherein there are input gears and oil pump driving gears on the low-speed shaft 3, and the oil pump driven gear is installed on the oil pump shaft 13, wherein the input gear is meshed with the high-speed gear shaft 6 (with a pinion), the oil pump driving gear is meshed with the oil pump driven gear, the low-speed front bearing 4 and the low-speed rear bearing 10 support the low-speed shaft 3, and the high-speed front bearing 5 and the high-speed rear bearing 10 support the high-speed gear shaft 6. The oil passages a, b, c, d, and e are connected according to the diagram, and for the convenience of processing, they are all drilled from the outside of the lower box body 1, and the starting section of the hole is threaded. After processing, the starting sections of the oil passages a, b, c, d, and e are blocked with plugs, and the lubricating oil pipe 2 is installed on the inside of the gearbox to make the gearbox structure more compact.

[0025] Figure 3a It is a partial cross-sectional view of the bearing oil inlet circuit of the gear box lubrication oil circuit of the present invention. The front and rear bearings are both provided with annular bearing oil inlet grooves which are connected to the bearing lubrication pipeline.

[0026] Figure 3b This is a partial cross-sectional view of the oil circuit of the gearbox oil pump of the present invention. The lubrication space of the oil pump shaft 13 is connected to the bearing oil inlet groove of the low-speed rear bearing 10 through an oil inlet channel. The end of the oil inlet channel adjacent to the bearing oil inlet groove is threadedly matched with a shut-off nozzle. The shut-off nozzle is axially provided with oil holes to play a throttling role. Since the oil pump shaft 13 has low power and low speed, it requires less lubricating oil, so the oil inlet channel is relatively small. However, since the hole distance is relatively long, the elongated hole is not easy to process. If the aperture is large, the amount of oil coming in from the oil pump will be relatively large, which can easily lead to oil shortage in high- and low-speed bearings and gears. Therefore, in order to facilitate the processing of the oil inlet channel, the present invention increases the aperture of the oil inlet channel, and the starting section of the hole is threaded, and then the shut-off nozzle is installed in the oil inlet channel. The specific structure of the shut-off nozzle is as follows: Figure 4 As shown, the outer ring has threads, a small oil hole inside, and a hexagonal head, which solves the problem that the oil inlet channel of the oil pump shaft 13 is difficult to process due to the slender aperture, while avoiding the problem of lack of oil in high and low speed bearings and gears due to excessive aperture.

[0027] Figure 5 : This is a structural diagram of the lubricating oil pipe of the present invention, which consists of flexible joints S1, S2, S3, S4, oil pipes, upper gear oil injection pipes and lower gear oil injection pipes, wherein the flexible joints S1, S2, S3, S4 are ferrule-type hinged pipe joints, and there are 4 1 mm small holes (spray holes) on the upper gear oil injection pipe and the lower gear oil injection pipe. The small holes of the upper gear oil injection pipe are directed toward the meshing position between the input gear and the high-speed gear shaft 6, and the small holes of the lower gear oil injection pipe are directed toward the meshing position between the input gear and the high-speed shaft 6.

[0028] The oil circuits a, b, c, d, e, the lubricating oil pipe 2, the bearing oil inlet circuit, and the oil pump circuit are the gearbox oil circuit structure of the present invention, which provide lubrication for the gearbox bearings, gears and pumps.

[0029] First, install the unions S1, S2, S3, and S4 on the lower box. Figure 5 Weld the lubricating oil pipe structure, clean the welded oil pipe and connect it to the flexible joints S1, S2, S3, and S4 respectively. After connection, assemble the gearbox bearing, box body and other parts.

[0030] Turn on the gearbox oil supply pump, and the oil enters the oil passages a, b, c, d, and e from the gearbox oil inlet, and then enters the lubricating oil pipe from the joints S1 and S2 respectively. A part of the oil in the lubricating oil pipe enters the bearing oil inlet groove through the joints S3 and S4 respectively through the bearing oil inlet oil passage to lubricate the bearing, and another part of the oil in the lubricating oil pipe is sprayed out from the small holes of the upper and lower oil spray pipes to lubricate the gears. Most of the oil entering the bearing oil inlet groove of the low-speed rear bearing 10 is used for lubrication of the low-speed rear bearing 10, and a small part of the lubricating oil is supplied to the oil pump for lubrication through the oil pump oil passage and the intercepting nozzle.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A lubricating oil circuit structure of a gearbox, comprising an upper case body and a lower case body of the gearbox, a low-speed shaft is installed between the upper case body and the lower case body through a low-speed front bearing and a low-speed rear bearing, a high-speed gear shaft is installed between the upper case body and the lower case body through a high-speed front bearing and a high-speed rear bearing, an input gear is installed on the low-speed shaft, and the input gear is meshed with the high-speed gear shaft, characterized in that: An oil inlet is provided at one end of the lower box body, and oil outlets and oil filling ports are symmetrically provided on both sides of the inner wall of the lower box body. Annular bearing oil inlet grooves are provided on the upper box body and the lower box body corresponding to the low-speed front bearing, the low-speed rear bearing, the high-speed front bearing, and the high-speed rear bearing for lubricating the bearings. The oil outlet is adjacent to the oil inlet, and the oil inlet is connected to the two oil outlets through an oil inlet branch. The oil filling port is located between the low-speed shaft and the high-speed gear shaft, and the oil filling port is connected to the two bearing oil inlet grooves on the corresponding side through an oil filling branch. The oil pipe system is also included, and the oil pipe system has two symmetrically arranged inlet pipes. An oil pipe, two oil outlet pipes, and an upper gear oil spray pipe and a lower gear oil spray pipe, the two oil inlet pipes are respectively connected to the oil outlet ports on the corresponding sides, and are used to output lubricating oil to the oil pipe system, the two oil outlet pipes are respectively connected to the oil inlet pipe and the oil filling port on the corresponding sides, and are used to inject lubricating oil into the bearing oil inlet groove through the oil filling branch, the upper gear oil spray pipe and the lower gear oil spray are respectively connected to the two oil inlet pipes, the upper gear oil spray pipe is used to spray oil from above to the meshing position of the input gear and the high-speed gear shaft, and the lower gear oil spray pipe is used to spray oil from below to the meshing position of the input gear and the high-speed gear shaft.

2. The lubricating oil circuit structure of a gear box according to claim 1, characterized in that: An oil pump is installed on the lower box body, and the oil pump shaft of the oil pump extends into the lower box body. An oil pump driven gear is arranged on the oil pump shaft of the oil pump, and an oil pump driving gear is arranged on the low-speed shaft. The oil pump driving gear is meshed with the oil pump driven gear to drive the oil pump. The oil pump is used to pump the oil in the lower box body into the oil inlet to form a circulation.

3. The lubricating oil circuit structure of a gear box according to claim 2, characterized in that: The lubrication space of the oil pump shaft is connected to the bearing oil inlet groove of the low-speed rear bearing through an oil inlet channel. The oil inlet channel is threadedly matched with a cut-off nozzle at one end adjacent to the bearing oil inlet groove. The cut-off nozzle is provided with oil holes along the axial direction to play a throttling role.

4. The lubricating oil circuit structure of a gear box according to claim 1, characterized in that: The oil inlet is located at the end where the low-speed shaft is located, the upper gear oil injection pipe and the lower gear oil injection pipe are located at the end where the high-speed gear shaft is located, the upper gear oil injection pipe is located on the outside above the high-speed gear shaft, and the lower gear oil injection pipe is located on the inside below the high-speed gear shaft.

5. The lubricating oil circuit structure of a gear box according to claim 1, characterized in that: The oil inlet pipe / oil outlet pipe is connected to the oil outlet / oil filling port via a sleeve-type hinged pipe joint.

6. The lubricating oil circuit structure of a gear box according to claim 1, characterized in that: The upper gear oil spray pipe and the lower gear oil spray pipe are respectively provided with a plurality of spray holes for spraying lubricating oil.

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