A gearbox

Abstract

The present invention discloses a gearbox, and relates to the technical field of gearboxes. The gearbox comprises a housing, a transmission shaft and a bearing, wherein the bearing is arranged in the housing, the transmission shaft is passed through the bearing, and one side end surface of the bearing, the transmission shaft and the housing form an oil cavity, and is characterized in that an oil inlet passage and an oil discharge passage are arranged on the housing, and both the oil inlet passage and the oil discharge passage are connected to the oil cavity, the oil inlet passage is used to spray oil to the bearing, and a first one-way valve is arranged in the oil discharge passage, and the oil in the oil cavity can flow out of the oil cavity through the first one-way valve. The gearbox can fully cool and lubricate the bearing when the bearing rotates at a high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a gearbox. Background Art

[0002] During wind power generation, the blade speed of the wind turbine generator is generally low. In order to convert the low speed of the blade into the high speed of the generator rotor, a device that can increase the speed is needed, namely a gearbox. The gearbox includes a low-speed shaft and a high-speed shaft, and realizes the process of speed change and torque change through internal gears and other transmission structures. The speed of the high-speed shaft is very high, and its bearings will generate a lot of heat during the force and rotation process, causing the bearing temperature to rise. Existing gearboxes mostly use the method of spraying oil on the bearings for lubrication and cooling, and can also take away fine particles caused by bearing wear.

[0003] However, the high-speed rotating bearing will form a seal on the oil, preventing the oil from passing through the bearing, which will cause the bearing temperature to continue to rise and the oil viscosity to continue to decrease, and the temperature difference between the inner and outer rings to continue to increase and the working clearance to continue to decrease. The decrease in viscosity will cause the bearing rolling elements to come into direct metal contact with the inner and outer rings, thereby accelerating the wear of the bearing rolling elements and the inner and outer rings, and eventually damage them. The continuous decrease in the working clearance of the bearing will in turn accelerate the further increase in the bearing temperature, causing the bearing to be easily damaged and reducing the service life of the gearbox.

[0004] In view of the above problems, it is necessary to develop a gearbox to solve the problem that the cooling oil is difficult to pass through the high-speed rotating bearings, resulting in poor cooling effect and severe wear. Summary of the invention

[0005] The object of the present invention is to provide a gearbox capable of cooling and lubricating a bearing when the bearing rotates at a high speed.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A gearbox comprises a housing, a transmission shaft and a bearing, wherein the bearing is arranged in the housing, the transmission shaft is passed through the bearing, one side end surface of the bearing, the transmission shaft and the housing form an oil chamber, an oil inlet passage and an oil discharge passage are arranged on the housing, both the oil inlet passage and the oil discharge passage are connected to the oil chamber, the oil inlet passage is used to spray oil to the bearing, a first one-way valve is arranged in the oil discharge passage, and the oil in the oil chamber can flow out of the oil chamber through the first one-way valve.

[0008] Preferably, it also includes:

[0009] An oil spray ring is arranged in the oil cavity and communicated with the oil inlet passage. A first oil spray nozzle is arranged on the oil spray ring, and an opening of the first oil spray nozzle faces the bearing.

[0010] Preferably, a plurality of the first oil injection nozzles are provided and arranged along the circumferential direction of the oil injection ring.

[0011] Preferably, the oil inlet passage is communicated with an upper portion of the oil chamber, and the oil discharge passage is communicated with a lower portion of the oil chamber.

[0012] Preferably, it also includes:

[0013] An oil inlet branch, one end of which is connected to the oil inlet passage;

[0014] a second oil spray nozzle, the second oil spray nozzle is connected to the other end of the oil inlet branch, and the opening of the second oil spray nozzle is toward the side of the bearing away from the first oil spray nozzle;

[0015] A second one-way valve is provided in the oil inlet branch, and the oil can be sprayed out from the second oil injection nozzle through the second one-way valve.

[0016] Preferably, both the first one-way valve and the second one-way valve are pressure valves.

[0017] Preferably, the threshold values ​​of the first one-way valve and the second one-way valve are equal.

[0018] Preferably, a speed change assembly is further included, the transmission shaft is provided with a circle of gear teeth, and the speed change assembly includes:

[0019] A fixed shaft, the fixed shaft being arranged in the gearbox;

[0020] A gear is rotatably sleeved on the fixed shaft, the gear is meshed with the gear teeth and the diameter of the gear is different from the diameter of the transmission shaft.

[0021] Preferably, it also includes a planetary gear train, the planetary gear train comprising:

[0022] An inner gear ring, the inner gear ring is fixedly arranged in the box body;

[0023] A planet carrier, the planet carrier is rotatably arranged on the fixed shaft;

[0024] A planetary gear, the planetary gear is rotatably disposed on the planetary carrier, and the planetary gear is meshed with the inner gear ring;

[0025] A sun gear is fixedly connected to the gear and rotates coaxially with the gear, and the sun gear is meshed with the planetary gear.

[0026] Preferably, an oil pump is further included, an oil pool for storing the oil is provided inside the box, an output end of the oil pump is connected to the oil inlet passage, and the oil pump can pump the oil in the oil pool into the oil inlet passage.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides a gearbox. In the gearbox, a rotating shaft is rotatably arranged in a housing through a bearing, and one side end face of the bearing, a transmission shaft and a housing together form an oil chamber, and an oil inlet passage and an oil discharge passage are arranged on the housing. The oil is sprayed toward the bearing from the oil inlet passage, and the oil lubricates the bearing when passing through the bearing gap, and at the same time takes away heat and wear particles. When the bearing rotates at high speed with the transmission shaft, a sealing surface is formed, which makes it impossible for the oil to pass through the bearing, and a large amount of oil will accumulate in the oil chamber. As the oil in the oil chamber increases, the internal pressure of the oil chamber gradually increases, and the oil can pass through the bearing under the action of a large pressure. When the rotation speed of the rotating shaft continues to increase, the sealing effect is further enhanced, and the oil is completely sealed in the oil chamber. When the pressure reaches the threshold of the first one-way valve, the first one-way valve opens, and the oil in the oil chamber is discharged and takes away the heat, which plays a certain protective role on the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the gearbox provided by the present invention;

[0030] Figure 2 It is a structural schematic diagram of the oil chamber and the transmission shaft provided by the present invention.

[0031] 100, box body;

[0032] 1. Bearing; 2. Oil chamber; 3. Transmission shaft; 4. Oil injection ring; 5. Speed ​​change assembly; 6. First planetary gear train; 7. Second planetary gear train; 8. Oil pool;

[0033] 21. Oil inlet passage; 22. Oil discharge passage; 23. First non-return valve; 24. Oil inlet branch; 25. Second fuel injector; 26. Second non-return valve; 41. First fuel injector; 51. Fixed shaft; 52. Gear; 61. First inner gear ring; 62. First planetary carrier; 63. First planetary gear; 64. First sun gear; 71. Second inner gear ring; 72. Second planetary carrier; 73. Second planetary gear; 74. Second sun gear. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0039] This embodiment provides a gearbox. Figure 1 and Figure 2 As shown, the gearbox includes a bearing 1, a housing 100, and a transmission shaft 3. The bearing 1 is arranged in the housing 100, and the transmission shaft 3 is passed through the bearing 1. One end surface of the bearing 1, the transmission shaft 3 and the housing 100 form an oil chamber 2. The housing 100 is provided with an oil inlet passage 21 and an oil outlet passage 22 connected to the oil chamber 2. The oil inlet passage 21 is used to spray oil to the bearing 1, and a first one-way valve 23 is provided in the oil outlet passage 22. The oil in the oil chamber 2 can flow out of the oil chamber 2 through the first one-way valve 23.

[0040] The gearbox sprays oil to the bearing 1 through the oil inlet passage 21 to lubricate and cool the bearing 1. When the transmission shaft 3 drives the bearing 1 to rotate at a relatively low speed, the oil can pass through the bearing 1 to lubricate and cool the bearing 1 and take away the wear particles. When the transmission shaft 3 rotates at a relatively high speed, it is difficult for the oil to pass through the bearing 1, and thus it accumulates in the oil chamber 2. As the amount of oil in the oil chamber 2 increases, the pressure gradually increases, and the oil will pass through the bearing 1 under the action of the pressure. When the speed of the transmission shaft 3 continues to increase, it is even more difficult for the oil to pass through the bearing 1. As the pressure rises, when the threshold of the first one-way valve 23 is reached, the first one-way valve 23 is opened, and the oil is discharged through the first one-way valve 23, so that new oil enters the oil chamber 2, which can cool the bearing 1 and prevent the accumulation of oil from cooling the bearing 1, causing the temperature of the bearing 1 to continue to rise.

[0041] like Figure 2 As shown, the gearbox also includes an oil injection ring 4, which is arranged in the oil chamber 2 and communicated with the oil inlet passage 21. The oil injection ring 4 is provided with a first oil injection nozzle 41, and the opening of the first oil injection nozzle 41 faces the bearing 1. The oil enters the oil injection ring 4 through the oil inlet passage 21, and then is sprayed onto the bearing 1 through the first oil injection nozzle 41 to cool and lubricate the bearing 1. The operator can control the injection of the oil by opening and closing the first oil injection nozzle 41. At the same time, since the oil injection hole of the first oil injection nozzle 41 is small, the speed of the oil injection can be accelerated, and the oil can pass through the bearing 1 more easily. Among them, the first oil injection nozzle 41 can be an electromagnetic valve. When the electromagnetic coil is energized, the needle valve is sucked up, and the first oil injection nozzle 41 is opened to spray the oil.

[0042] Preferably, the oil injection ring 41 can also be cast on the housing 100, and the oil inlet passage 21 and the oil outlet passage 22 can be cast in a pre-embedded manner.

[0043] In order to achieve better cooling and lubricating effect on the bearing 1, a plurality of first oil spray nozzles 41 are provided and arranged along the circumference of the oil spray ring 4, so as to cool and lubricate multiple parts of the bearing 1 at the same time, so that the bearing 1 can be cooled down quickly, and at the same time, wear particles in multiple parts of the bearing 1 can be removed.

[0044] In order to improve the lubrication and cooling effect of the oil on the bearing 1, a plurality of first oil spray nozzles 41 are arranged at the upper part of the oil chamber 2. When the oil is sprayed onto the bearing 1, it flows downward under the action of gravity, which can increase the area of ​​the oil flowing through the bearing 1. It can be understood that in order to facilitate the oil in the oil chamber 2 to flow out of the oil chamber 2 after reaching a certain pressure, the first one-way valve 23 and the oil discharge passage 22 are arranged at the lower part of the oil chamber 2.

[0045] When the transmission shaft 3 rotates at a high speed, even if the oil in the oil chamber 2 is discharged from the first one-way valve 23, it can play a certain cooling role on the bearing 1, but the temperature of the bearing 1 is still high, and the oil in the bearing 1 cannot be replenished, resulting in wear of the bearing 1 during use. To solve this problem, the gearbox also includes an oil inlet branch 24, a second oil spray nozzle 25 and a second one-way valve 26. One end of the oil inlet branch 24 is connected to the oil inlet passage 21, and the second oil spray nozzle 25 is connected to the other end of the oil inlet branch 24, and the opening of the second oil spray nozzle 25 faces the side of the bearing 1 away from the first oil spray nozzle 41. The second one-way valve 26 is arranged in the oil inlet branch 24, and the oil can be sprayed out by the second oil spray nozzle 25 through the second one-way valve 26. When the pressure in the oil chamber 2 increases and exceeds the threshold of the second one-way valve 26, the oil in the oil inlet branch 24 causes the second one-way valve 26 to open, and the oil is sprayed from the second one-way valve 26 to the bearing 1, which plays a role in cooling and lubricating the bearing 1. In other embodiments, the second oil spray nozzle 25 may also be an oil spray disc having the same structure as the oil spray disc in the oil chamber 2 . The two oil spray discs are located on both sides of the bearing 1 and are symmetrically arranged with respect to the bearing 1 .

[0046] Preferably, both the first one-way valve 23 and the second one-way valve 26 are pressure valves. The pressure valve has a simple structure, high reliability, meets the 20-year service life, and can calculate the preset threshold value. When the pressure in the oil chamber 2 reaches the threshold value, it can be opened without human intervention, which greatly improves efficiency and reduces costs.

[0047] Furthermore, the thresholds of the first one-way valve 23 and the second one-way valve 26 are equal. When the oil in the oil chamber 2 can still pass through the bearing 1 under the action of pressure, there is no need to open the second one-way valve 26. When the oil cannot pass through the bearing 1 due to the excessive rotation speed of the bearing 1, as the pressure increases, the first one-way valve 23 and the second one-way valve 26 are opened at the same time, and the high-temperature oil in the oil chamber 2 is discharged. The incoming oil and the oil sprayed by the second oil spray nozzle 25 cool the two ends of the bearing 1, which can ensure the normal operation of the bearing 1 and extend its service life.

[0048] like Figure 1 As shown, the gearbox also includes a speed change assembly 5, a circle of gear teeth is arranged on the transmission shaft 3, the speed change assembly 5 includes a fixed shaft 51 and a gear 52, the fixed shaft 51 is arranged in the gearbox, the gear 52 is rotatably sleeved on the fixed shaft 51, the gear 52 is meshed with the gear teeth of the transmission shaft 3, and the diameter of the gear 52 is different from the diameter of the transmission shaft 3. The gearbox realizes synchronous rotation through the meshing of the gear 52 and the gear teeth on the transmission shaft 3, and because the diameter of the gear 52 is different from the diameter of the transmission shaft 3, the rotation speeds of the two are different, thus achieving the effect of speed change and torque change.

[0049] In order to further improve the speed range of the gearbox, the gearbox also includes a planetary gear train. Since the gearbox can be provided with multiple planetary gear trains, for ease of understanding, it is referred to as the first planetary gear train 6 here, and the first planetary gear train 6 includes a first inner ring gear 61, a first planet carrier 62, a first planetary gear 63 and a first sun gear 64. The first inner ring gear 61 is fixedly arranged in the housing 100, the first planet carrier 62 is rotatably arranged on the fixed shaft 51, the first planetary gear 63 is rotatably arranged on the first planet carrier 62, and the first planetary gear 63 is meshed with the first inner ring gear 61, the first sun gear 64 is fixedly connected to the gear 52 and rotates coaxially, and the first sun gear 64 is meshed with the first planetary gear 63.

[0050] Here, the example of external force driving the first planet carrier 62 to rotate is taken, and at this time, the gearbox is an acceleration gearbox. Since the first inner gear ring 61 is fixed, when the external force drives the first planet carrier 62 to rotate, the first planetary gear 63 revolves around the first sun gear 64 while rotating itself, driving the first sun gear 64 to rotate, and the first sun gear 64 is fixedly connected to the gear 52 and rotates coaxially, which can drive the transmission shaft 3 to rotate, and the transmission shaft 3 outputs a high speed. It can be understood that the transmission shaft 3 can also accept the action of external force as an input shaft. At this time, the gearbox is a reduction gearbox, and the first planet carrier 62 outputs a low speed.

[0051] Preferably, a plurality of first planetary gears 63 are rotatably arranged on the first planet carrier 62, and the plurality of first planetary gears 63 are evenly spaced around the first sun gear 64. The plurality of first planetary gears 63 can make the first planetary gear train 6 more balanced in force during operation, and can achieve a larger transmission ratio while maintaining stability.

[0052] It can be understood that the gearbox further includes a second planetary gear train 7, which includes a second inner gear ring 71, a second planet carrier 72, a second planetary gear 73 and a second sun gear 74. The structure of the second planetary gear train 7 is the same as that of the first planetary gear train 6, and the second sun gear 74 is fixedly connected to the first planet carrier 62 and rotates coaxially. The transmission ratio can be further improved by providing the second planetary gear train 7.

[0053] Preferably, there are multiple planetary gear trains, and the inner gear rings of the planetary gear trains are fixedly arranged in the housing 100. In two adjacent planetary gear trains, the planet carrier of one planetary gear train is connected to the sun gear of the other planetary gear train. Through the transmission of multiple planetary gear trains, the speed and torque changing capabilities of the gearbox can be greatly improved.

[0054] The gearbox is provided with an oil pool 8 for storing oil, and the gearbox also includes an oil pump, the output end of which is connected to the oil inlet passage 21, and the oil pump can pump the oil in the oil pool 8 into the oil inlet passage 21. The gearbox stores oil for cooling and lubrication, and the oil pumped by the oil pump will flow back to the oil pool 8 for recycling after cooling and lubricating the bearing 1 and other components.

[0055] Preferably, the oil entering the oil drain passage 22 through the first one-way valve 23 can flow to other structures that need lubrication and cooling to continue to participate in the lubrication and cooling of the gearbox, and finally flow back to the oil pool 8.

[0056] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A gearbox, comprising a housing (100), a transmission shaft (3) and a bearing (1), wherein the bearing (1) is arranged in the housing (100), the transmission shaft (3) passes through the bearing (1), and an end surface of one side of the bearing (1), the transmission shaft (3) and the housing (100) form an oil chamber (2), characterized in that: An oil inlet passage (21) and an oil discharge passage (22) are provided on the housing (100); the oil inlet passage (21) and the oil discharge passage (22) are both in communication with the oil chamber (2); the oil inlet passage (21) is used to spray oil onto the bearing (1); a first one-way valve (23) is provided in the oil discharge passage (22); the oil in the oil chamber (2) can flow out of the oil chamber (2) through the first one-way valve (23); An oil injection ring (4), the oil injection ring (4) being arranged in the oil chamber (2) and communicating with the oil inlet passage (21), the oil injection ring (4) being provided with a first oil injection nozzle (41), the opening of the first oil injection nozzle (41) facing the bearing (1); An oil inlet branch (24), one end of the oil inlet branch (24) being in communication with the oil inlet passage (21); a second oil spray nozzle (25), the second oil spray nozzle (25) being in communication with the other end of the oil inlet branch (24), and the opening of the second oil spray nozzle (25) being directed toward a side of the bearing (1) away from the first oil spray nozzle (41); a second one-way valve (26), the second one-way valve (26) being arranged in the oil inlet branch (24), and the oil can be sprayed out from the second oil spray nozzle (25) through the second one-way valve (26); The threshold values ​​of the first one-way valve (23) and the second one-way valve (26) are equal.

2. The gearbox according to claim 1, characterized in that: A plurality of the first oil injection nozzles (41) are provided and are arranged along the circumference of the oil injection ring (4).

3. The gearbox according to claim 1, characterized in that: The oil inlet passage (21) is in communication with the upper portion of the oil chamber (2), and the oil discharge passage (22) is in communication with the lower portion of the oil chamber (2).

4. The gearbox according to claim 1, characterized in that: The first one-way valve (23) and the second one-way valve (26) are both pressure valves.

5. The gearbox according to claim 1, characterized in that: It also includes a speed change assembly (5), wherein the transmission shaft (3) is provided with a circle of gear teeth, and the speed change assembly (5) includes: A fixed shaft (51), the fixed shaft (51) being arranged in the gearbox; A gear (52), the gear (52) being rotatably sleeved on the fixed shaft (51), the gear (52) being meshed with the gear teeth, and the diameter of the gear (52) being different from the diameter of the transmission shaft (3).

6. The gearbox according to claim 5, characterized in that: Also included is a planetary gear train, the planetary gear train comprising: An inner gear ring, the inner gear ring being fixedly arranged in the box body (100); a planet carrier, the planet carrier being rotatably disposed on the fixed shaft (51); A planetary gear, the planetary gear is rotatably disposed on the planetary carrier, and the planetary gear is meshed with the inner gear ring; A sun wheel is fixedly connected to the gear (52) and rotates coaxially, and the sun wheel is meshed with the planetary gear.

7. The gearbox according to any one of claims 1 to 6, characterized in that: It also includes an oil pump. An oil pool (8) for storing the oil is provided inside the box (100). The output end of the oil pump is connected to the oil inlet passage (21). The oil pump can pump the oil in the oil pool (8) into the oil inlet passage (21).

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