Gearbox ventilation structure and gearbox

Abstract

The utility model discloses a gearbox ventilation structure and a gearbox, and belongs to the technical field of engineering machinery, the gearbox ventilation structure comprises a box body, the box body is provided with a flange plate, the flange plate is used for being assembled and fixed with a shell of a motor, and the flange plate and the shell of the motor define a closed cavity; an air channel is formed in the flange plate, and two openings, namely a first air channel opening and a second air channel opening, are formed in the flange plate by the air channel; the first air channel opening is communicated with the cavity, the second air channel opening is connected with a hollow pipe, the hollow pipe is arranged outside the flange plate, the inner cavity forms a communicated labyrinth structure, the two ends of the hollow pipe are opened to form a first pipe opening and a second pipe opening, the first pipe opening is communicated with the second air channel opening, and the second pipe opening is connected with a respirator and communicated with the outside through the respirator; a filter screen is arranged in the respirator and used for exchanging gas in the cavity with external gas and blocking external pollutants. According to the ventilation structure, oil leakage of the gearbox can be effectively prevented while internal and external gas exchange and external pollutant blocking of the gearbox are both considered.

Description

TECHNICAL FIELD

[0001] The utility model belongs to engineering machinery technical field relates to a gearbox, specifically, relate to a kind of ventilation structure on gearbox. BACKGROUND

[0002] Gearbox is a kind of mechanism for changing the speed and torque from engine or motor, it can be fixed or change its output shaft and input shaft between transmission ratio, to expand the range of output speed and torque, realize the efficient transmission of power.

[0003] Because of the gear set, bearing and other rotating parts are arranged in gearbox, therefore, it is necessary to add hydraulic oil to lubricate these rotating parts, to reduce wear and tear, and play the role of heat dissipation cooling to avoid component overheating, oxygen isolation to prevent metal corrosion. At the same time, hydraulic oil also bears the function of power transmission and shift control in automatic gearbox.

[0004] Because the oil temperature fluctuates obviously inside the gearbox when it is running, usually between-40℃ to 100℃. When the oil temperature rises continuously to reach thermal equilibrium, it will cause the gas in the cavity to expand and the oil mist to be atomized, and then cause the pressure of the cavity of the gearbox to rise, causing danger. In order to balance the internal and external air pressure of the gearbox, it is necessary to set a ventilation structure on the gearbox, so that the airflow in the cavity of the gearbox can keep unobstructed with the outside, which can play an important role in oil circulation, sealing and normal work of parts.

[0005] The traditional ventilation structure usually sets a ventilation valve or filter valve on the gearbox, which exchanges gas through physical barrier to ensure the stability of the internal pressure of the gearbox, and also prevents the dust, water vapor and other pollutants from entering the inside of the gearbox, causing the oil to deteriorate, the mechanical parts to wear faster, the system reliability to decrease and other problems.

[0006] The common problem of traditional ventilation structure is that when the gearbox is running at high speed, the oil in the cavity is thrown up, causing part of the oil to be thrown out to the outside through the ventilation structure, causing the gearbox to leak oil, not only polluting the environment, but also causing the oil in the gearbox to be missing, affecting the normal operation of the gearbox.

[0007] The above information disclosed in the background is only used to increase the understanding of the background of the application, therefore, it can include prior art known by those skilled in the art. SUMMARY

[0008] The utility model discloses in view of at least one technical problem existing in prior art, proposes a kind of gearbox ventilation structure, while giving consideration to the gas exchange inside and outside gearbox and barrier outside pollutant invasion, can effectively prevent gearbox from leaking oil.

[0009] To solve the above technical problems, the utility model adopts the following technical solutions to be realized:

[0010] In one aspect, the utility model provides a gearbox ventilation structure, the gearbox has a box body, and a flange plate is arranged on the box body; the flange plate is used for assembling and fixing with the shell of a motor and encloses a closed cavity with the shell of the motor; the ventilation structure comprises:

[0011] An air passage is arranged on the flange plate and forms two openings on the flange plate, which are a first air passage opening and a second air passage opening; wherein the first air passage opening is communicated with the cavity, and the second air passage opening is formed on the outer wall of the flange plate;

[0012] A hollow pipe is arranged outside the flange plate, and a labyrinth structure is formed in the inner cavity of the hollow pipe; the hollow pipe is open at both ends to form a first pipe opening and a second pipe opening; the first pipe opening is communicated with the second air passage opening;

[0013] A respirator is communicated with the second pipe opening of the hollow pipe and internally arranged with a filter screen, which is used for the exchange of gas in the cavity and the outside air and blocks the outside pollutants.

[0014] In some embodiments of the present application, for the input shaft of the gearbox, the shaft can be supported by the bearing of the gearbox box and extended into the cavity for connecting the output shaft of the motor; an oil injection channel can be arranged in the box body, and a drainage oil channel can be arranged on the flange plate; the drainage oil channel is communicated with the oil injection channel to receive the oil from the oil injection channel and inject into the cavity to lubricate the bearing and other related components and take away the heat.

[0015] In some embodiments of the present application, a pair of aligned oil return holes can be arranged on the corresponding positions of the flange plate and the box body to form an oil return channel, which is used for returning the oil in the cavity to the box body to avoid the oil level in the cavity being too high and further reduce the risk of oil leakage when exhausting.

[0016] In some embodiments of the present application, in order to avoid the oil in the cavity entering the air passage as much as possible, the middle area of the flange plate can be concave to form a cavity, a radial shoulder extending to the center of the cavity can be formed on the inner wall of the cavity, the first air passage opening can be arranged on the shoulder, and the shoulder can form a gap between the motor shell after the motor is installed on the flange plate to reduce the probability of the oil in the cavity being thrown into the air passage.

[0017] In some embodiments of the present application, the gap can be set between 4mm and 8mm, which can reduce the possibility of the oil in the cavity being thrown into the air passage as much as possible without affecting the exchange of gas in the cavity and the outside air.

[0018] In some embodiments of the present application, the air passage can be designed as a zigzag shape, and the second air passage opening can be arranged higher than the first air passage opening. The zigzag-shaped air passage can block the oil entering the air passage, and reduce the amount of oil reaching the second air passage opening.

[0019] In some embodiments of the present application, the hollow tube can be arranged such that the second tube opening is higher than the first tube opening after being installed at the second air passage opening, so as to prevent the oil entering the hollow tube from bypassing the communicating labyrinth structure and overflowing.

[0020] In some embodiments of the present application, in order to form a communicating labyrinth structure in the inner cavity of the hollow tube, at least two baffles can be arranged in the inner cavity of the hollow tube. The adjacent baffles are arranged along the axial direction of the hollow tube, and the adjacent baffles extend from the opposite side walls of the inner cavity of the hollow tube to the center of the hollow tube and terminate beyond the center of the hollow tube. The terminal edge is suspended, and the peripheral side edge of the baffle except the terminal edge is connected to the inner cavity wall of the hollow tube. In this way, the gas and oil entering the hollow tube can only pass through the terminal edge of each baffle when reaching each baffle, forming a detour path. Since the second tube opening of the hollow tube is higher than the first tube opening, the oil entering the hollow tube through the first tube opening can be blocked by the baffles and fall back to the air passage, thereby solving the oil leakage problem of the gearbox.

[0021] In some embodiments of the present application, in order to facilitate the formation of the labyrinth structure in the hollow tube, the hollow tube can be divided into a docked upper segment and a lower segment. The lower segment is connected to the second air passage opening, and the upper segment is connected to the breather. The baffles are arranged in the inner cavities of the upper segment and the lower segment and adjacent to the docking position of the upper segment and the lower segment, so as to facilitate processing.

[0022] In some embodiments of the present application, the inner cavity of the lower segment of the hollow tube can be designed as a variable-diameter inner cavity with a narrow lower part and a wide upper part. In this way, when the internal pressure of the gearbox increases and exhausts, the high-pressure exhaust gas can partially release pressure when passing through the variable-diameter inner cavity, so as to smoothly exhaust. When the internal pressure of the gearbox decreases and inhales, the external air can partially increase pressure when passing through the variable-diameter inner cavity, so as to quickly balance the internal pressure of the gearbox.

[0023] In some embodiments of the present application, an extension hose can also be installed between the hollow tube and the breather, so as to raise the position of the breather. In this way, oil can be further prevented from leaking, and the breather can be easily maintained and cleaned.

[0024] In another aspect, the utility model also proposes a gearbox, including the box, the flange plate is equipped on the box, the flange plate is used for with the shell assembly fixed of motor, and with the shell of motor surrounds closed cavity, the air passage is opened on the flange plate, the air passage forms two openings on the flange plate, is first air passage mouth and second air passage mouth respectively, wherein, first air passage mouth communicates with the cavity, second air passage mouth forms on the outer wall of flange plate, second air passage mouth connects hollow tube, hollow tube is outside flange plate, the inner chamber forms the labyrinth structure of intercommunication, the both ends opening of hollow tube forms first pipe mouth and second pipe mouth, first pipe mouth communicates second air passage mouth, second pipe mouth connects respirator, the filter screen is built-in in respirator, is used for the exchange of gas in the cavity and outside gas and blocks outside pollutant.

[0025] Compared with the prior art, the advantages and positive effects of the utility model mainly reflect in:

[0026] 1, the utility model discloses the ventilation structure can quickly balance the inside and outside air pressure of gearbox, then effectively prevents the emergence of the problems such as the damage of sealing element, oil seal leakage, oil circulation and the normal work of the parts in the box caused by the overhigh air pressure in the box.

[0027] 2, the utility model opens the air passage on the flange plate of gearbox, leads out the high-pressure gas in the box, and sets up the hollow tube of intercommunication air passage on the outside of flange plate, passes through the configuration hollow tube higher than air passage, and sets up the labyrinth structure in the inner chamber of hollow tube, thereby can lead the high-pressure gas that leads out the box through air passage to drain upwards, then makes the oil that can fall back to the gearbox under the block of labyrinth structure along with the high-pressure gas that discharges the box, avoids leakage, thereby solves the oil leakage problem of the ventilation structure of existing gearbox.

[0028] 3, the utility model passes through installing respirator on hollow tube, sets up filter screen in respirator, thereby can prevent the outside pollutant from entering gearbox, keeps the oil in the gearbox pure, avoids the damage of the parts in the box caused by the invasion of outside pollutant.

[0029] 4, the utility model configures hollow tube and respirator on the outside of flange plate, when daily maintenance, only needs to take down and wash hollow tube and respirator from flange plate, convenient and fast, is favorable for improving the maintenance and maintenance efficiency of gearbox.

[0030] 5, the ventilation structure of the utility model considers the exchange of gas in and outside gearbox, blocks the outside pollutant from entering the box, prevents the oil in the box from leaking out and other multiple functions, simple structure, strong universality, can be applicable to different types of gearbox.

[0031] After reading the specific embodiment of the utility model in conjunction with the drawings, other features and advantages of the utility model will become more apparent. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the gearbox and motor assembly proposed in this utility model;

[0034] Figure 2 yes Figure 1 Exploded structural diagram;

[0035] Figure 3 yes Figure 1 Enlarged partial cross-sectional view from AA direction;

[0036] Figure 4 yes Figure 2 A schematic diagram of one embodiment of the motor in the image;

[0037] Figure 5 yes Figure 2 A partial structural schematic diagram of one embodiment of the gearbox input shaft;

[0038] Figure 6 yes Figure 2 A schematic diagram of the structure of one embodiment of the flange;

[0039] Figure 7 yes Figure 6 The diagram shows the structure of the flange from another perspective.

[0040] Figure 8 Is Figure 7 The diagram shows the structure after the hollow tube and the breather are installed on the flange.

[0041] Figure 9 This is a schematic diagram of one embodiment of a hollow tube;

[0042] Figure 10 yes Figure 9 A cross-sectional view of the hollow tube along the BB direction;

[0043] Figure 11 This is a schematic diagram of one embodiment of a respirator.

[0044] In the figure, 100, gearbox; 110, box body; 111, screw hole; 120, input shaft; 130, bearing; 140, oil return hole; 141, oil injection oil channel; 142, drainage oil channel; 143, oil return hole; 200, flange; 201, outer wall; 202, inner wall; 210, cavity; 220, air channel; 221, first air channel opening; 222, second air channel opening, 230, shoulder; 231, gap; 240, bolt; 241, threaded hole; 250, sealing ring; 260, sealing ring; 300, motor; 310, shell; 320, spline; 330, bolt; 400, hollow pipe; 401, first pipe opening; 402, second pipe opening; 403, butt joint position; 410, inner cavity; 420, partition; 421, end edge; 430, upper section; 440, lower section; 500, respirator. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally formed, or it can be connected inside the components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0049] In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more than two.

[0050] The transmission of the engineering vehicle is the core component of the power transmission system, mainly used for adjusting the output torque and speed of the motor to adapt to the high load demand under complex working conditions.

[0051] ‌The transmission needs to cooperate with the motor to transmit power, and in the structural design, the flange plate 200 is usually installed on the box body 110 of the transmission 100, combined Figure 1 、 Figure 2 As shown, or the flange plate 200 is integrated with the box body 110, connected with the shell 310 of the motor 300 through the flange plate 200, to realize the assembly and fixation between the transmission 100 and the motor 300.

[0052] After the motor 300 is installed on the flange plate 200, the shell 310 of the motor and the flange plate 200 will form a closed cavity 210, as Figure 3 As shown, the output shaft of the motor 300 needs to be connected to the rotating mechanism in the transmission 100 through the cavity 210, for example, the spline 320 can be installed on the output shaft of the motor 300, as Figure 4 As shown, the input shaft 120 of the transmission 100 is connected through the spline 320, as Figure 5 As shown, to transmit power from the motor 300 to the transmission 100. In the transmission 100, the input shaft 120 is supported on the box body 110 by the bearing 130, and the gear can be installed on the input shaft 120, selectively engaged with different gear sets in the box body 110, to change the transmission ratio, to realize the transmission.

[0053] Like the input shaft 120, the bearing 130, the spline 320, the gear set and other rotating parts, these rotating parts need to add hydraulic oil for lubrication when working, to reduce wear and tear, and play the role of heat dissipation cooling to avoid overheating of parts, and isolation of oxygen to prevent metal corrosion. Therefore, the transmission 100 needs to inject hydraulic oil when in use, and the oil is distributed in the box body 110 and the cavity 210.

[0054] When the transmission 100 works, the temperature of the hydraulic oil will continue to rise, causing the gas in the box body 110 and the cavity 210 to expand and the oil mist to be atomized, which will cause the air pressure in the box body 110 and the cavity 210 to rise, affecting the safety of the transmission 100. In order to solve this problem, a ventilation structure needs to be provided on the transmission 100 to balance the internal and external air pressure.

[0055] The ventilation structure of the embodiment is arranged on the flange plate 200, which does not affect the inherent structure of the transmission 100, so as to improve the universality of the ventilation structure on different transmissions.

[0056] Specifically, as shown in Figure 3 , Figure 6 to Figure 8 , the ventilation structure of the embodiment mainly includes airway 220, hollow tube 400, respirator 500 and other key parts. Among them, airway 220 is opened on flange plate 200 to lead high-pressure gas in gearbox 100 to the outside. Hollow tube 400 and respirator 500 are installed outside flange plate 200, hollow tube 400 is used to block the oil in cavity 210 from being thrown out, and respirator 500 is used to block external pollutants and keep the environment in the gearbox pure while exchanging the internal and external gases of gearbox 100.

[0057] In order to reduce the oil entering airway 220 as much as possible, in some embodiments, airway 220 can be opened at the top of flange plate 200, as shown in Figure 3 The two ends of airway 220 are opened, as shown in Figure 6 , Figure 7 , one end opening towards cavity 210 is called first airway port 221, and the other end opening towards the outside is called second airway port 222.

[0058] In some embodiments, airway 220 can be designed as a polyline, for example, it can be designed as L-shaped, V-shaped, zigzag-shaped, etc., as shown in Figure 3 , and the height of second airway port 222 is higher than that of first airway port 221 to block part of the oil, so that it can be blocked and fall back into cavity 210 when passing through airway 220, thereby reducing the amount of oil entering hollow tube 400.

[0059] In order to reduce the probability of oil in cavity 210 entering airway 220, the position of first airway port 221 can be configured according to the distance between the shell 310 of motor 300 and the inner wall 202 of the cavity of flange plate 200, so that there is only a narrow gap 231 between first airway port 221 and the shell 310 of motor 300, which can reduce the possibility of oil entering airway 220 through the narrow gap 231.

[0060] Specifically, as shown in Figure 6As shown, the middle region of the flange plate 200 is concave (i.e. recessed away from the motor 300), forming a cavity. A shoulder 230 is formed on the inner wall 202 of the cavity, extending radially to the center of the flange plate 200, and the first air passage opening 221 is formed on the shoulder 230. After the motor 300 is installed on the flange plate 200, the shoulder 230 can form a narrow gap 231 with the shell 310 of the motor 300, and the gap 231 can communicate with the closed cavity 210 formed by the flange plate 200 and the motor shell 310. In this way, not only can the gas in the cavity 210 smoothly enter the air passage 220 through the gap 231 to meet the demand of gas exchange, but also the amount of oil in the cavity 210 entering the air passage 220 can be reduced, thereby reducing the probability of oil leakage of the gearbox.

[0061] In some embodiments, the gap can be configured to be between 4mm and 8mm, for example, the gap can be set to about 5mm to meet the needs of ventilation and oil blocking.

[0062] The air passage 220 extends along a broken line path from the shoulder 230 to the outer wall 201 of the flange plate 200, and the second air passage opening 222 is formed on the outer wall 201, as shown in Figure 7 , so that the second air passage opening 222 communicates with the outside.

[0063] In some embodiments, the second air passage opening 222 can be located on the outer wall 201 at the top of the flange plate 200, and the second air passage opening 222 can be higher than the first air passage opening 221, so that part of the oil entering the air passage 220 can first fall back into the cavity 210 under the blocking of the air passage 220, thereby reducing the amount of oil entering the hollow tube 400.

[0064] In this embodiment, the hollow tube 400 is arranged outside the flange plate 300, as shown in Figure 8 , and is detachably connected (e.g. threaded connection) to the second air passage opening 222, so that it can be easily removed for later maintenance and repair work.

[0065] In this embodiment, the hollow tube 400 extends upward after being installed on the second air passage opening 222, and a labyrinth structure is arranged inside the hollow tube 400 to block the oil entering the hollow tube 400, so that the oil can all fall back into the cavity 210 of the flange plate 200, thereby solving the problem of oil leakage of the gearbox 100.

[0066] Specifically, as shown in Figure 9 , Figure 10As shown, two ends of the hollow tube 400 can be configured to be open to form a first tube opening 401 and a second tube opening 402. The first tube opening 401 and the second tube opening 402 are in communication with the inner cavity 410 of the hollow tube 400, so that the hollow tube 400 forms a through tube with both ends.

[0067] A plurality of baffles 420 are arranged in the inner cavity 410 of the hollow tube 400. The plurality of baffles 420 are arranged in an interleaved manner to form a communication labyrinth structure, so that the oil is effectively blocked without hindering the normal exchange of gas.

[0068] In some embodiments, the adjacent baffles 420 can be arranged in the axial direction of the hollow tube 400, and the adjacent baffles 420 can be arranged to extend from the opposite side walls of the inner cavity 410 of the hollow tube 400 to the center of the hollow tube 400 in parallel and terminate at a position beyond the center of the hollow tube 400. The termination edge 421 is suspended, and each baffle 420 is connected to the inner cavity wall of the hollow tube 400 except for the termination edge 420. Thus, a winding communication path is formed between the plurality of baffles 420, so that the gas can pass normally, and the oil is blocked by the baffles 420 and cannot pass.

[0069] Taking the hollow tube 400 as a circular tube and the two baffles 420 arranged in the inner cavity 410 as an example, as shown in Figure 10 As shown, the two baffles 420 can be configured as fan-shaped baffles greater than one-half of a circle, and the radius of the one-half of a circle is equal to the inner cavity radius of the hollow tube 400. The two baffles 420 are arranged in the inner cavity 410 of the hollow tube 400 in an interleaved manner with an interval therebetween. One of the baffles blocks the left half of the inner cavity 410 of the hollow tube in the radial direction, and the other baffle blocks the right half of the inner cavity 410 of the hollow tube in the radial direction. The straight edges of the two fan-shaped baffles 420 as the termination edges 421 both exceed the center position of the inner cavity 410 of the hollow tube (i.e., the two baffles 420 have an overlapping portion), so that a communication labyrinth structure can be formed, and the gas and oil entering the hollow tube 400 can only pass through the termination edge 421 of each baffle 420 when reaching each baffle 420.

[0070] The first tube opening 401 of the hollow tube 400 is in communication with the second air passage opening 222 of the air passage 220, and the second tube opening 402 of the hollow tube 400 is configured to be higher than the first tube opening 401. Thus, the oil entering the hollow tube 400 through the first tube opening 401 can be blocked by the baffles 420 and fall back to the air passage 220, thereby solving the oil leakage problem of the gearbox 100.

[0071] In order to simplify the processing technology, the hollow tube 400 can be designed as a multi-section structure, for example, as an upper section and a lower section. The bottom opening of the lower section 440 is the first tube opening 401, which is used to connect the second air passage opening 222 of the air passage 220. The top opening of the lower section 440 is connected to the bottom opening of the upper section 430. The top opening of the upper section 430 is the second tube opening 402, which is used to connect the respirator 500. A partition plate 420 is arranged in the inner cavity of the upper section and the lower section, and the arrangement position is preferably adjacent to the joint position 403 of the upper section 430 and the lower section 440. Thus, for the hollow tube 400 made of metal, the welding operation or the forming process can be facilitated.

[0072] In some embodiments, the inner cavity of the lower section 440 of the hollow tube can be designed as a variable-diameter inner cavity with a narrow lower section and a wide upper section, as shown in FIG. 4B. Thus, when the internal pressure of the gearbox 100 increases and exhaust is performed, the high-pressure exhaust can partially release pressure when passing through the variable-diameter inner cavity, thereby being able to smoothly exhaust to a certain extent. When the internal pressure of the gearbox 100 decreases and forms a negative pressure, and air needs to be sucked, the external air can partially increase the pressure when passing through the variable-diameter inner cavity, thereby being able to accelerate the speed of balancing the internal and external air pressures of the gearbox. Figure 10

[0073] The respirator 500 is installed on the second tube opening 402 of the hollow tube 400. The respirator 500 can adopt an existing product on the market, as shown in FIG. 5A. Figure 11 Since the respirator 500 is internally provided with a filter screen, it can block the external dust, water vapor and other pollutants, so as to prevent them from entering the inside of the gearbox 100 through the hollow tube 400 and the air passage 220, thereby causing the oil in the gearbox to deteriorate, the mechanical parts to wear faster, and the system reliability to decrease.

[0074] In order to facilitate cleaning or replacement of the respirator 500, the respirator 500 can be detachably connected to the second tube opening 402 of the hollow tube 400 by using a detachable connection mode (for example, a threaded connection mode). The respirator 500 communicates with the outside, filters and exchanges the air at the same time.

[0075] In some embodiments, an extension hose can be additionally arranged between the respirator 500 and the second tube opening 402 of the hollow tube 400, so as to elevate the position of the respirator 500, thereby further preventing oil from leaking and facilitating maintenance and cleaning of the respirator 500.

[0076] In addition, after the motor 300 is installed on the flange plate 200, in order to lubricate the bearing 130 installed on the input shaft 120 of the gearbox and the spline 320 connected to the output shaft of the motor, an oil injection channel 141 can be arranged in the gearbox body 110, as shown in FIG. 6A. Figure 3 ​The oil injection channel 141 is arranged to communicate with the oil injection channel 142, and the oil injection channel 142 is arranged to communicate with the closed cavity 210 formed by the flange plate 200 and the housing 310 of the motor. After the gearbox 100 is started, the oil for lubrication enters the oil injection channel 141, and then enters the oil injection channel 142, and then flows into the cavity 210 to lubricate the bearing 130, the spline 320 and other related components, and can take away the heat generated by these components during operation, to ensure normal operation of the equipment.

[0077] In addition, in order to avoid the oil level in the cavity 210 being too high, the embodiment is provided with an oil return hole 143 on the flange plate 200 and an oil return hole 140 on the gearbox 100, which are combined with each other to form an oil return channel. Figure 2 、 Figure 7 The two oil return holes 143 and 140 are arranged at corresponding positions of the flange plate 200 and the gearbox 100 and are aligned with each other. When the oil in the cavity 210 is higher than the height of the oil return hole 143, the oil will flow back from the cavity 210 to the gearbox 100 through the oil return channel and the gap between the rollers of the bearing 130, which not only limits the amount of oil injected into the cavity 210, but also prevents excessive oil injection, and by limiting the amount of oil injected into the cavity 210, the risk of oil leakage during exhaust can be further reduced.

[0078] Industrial applicability

[0079] In actual application, first, the flange plate 200 is installed on the gearbox 100. During installation, the installation angle of the flange plate 200 is adjusted so that the second air port 222 arranged on the outer wall 201 of the flange plate 200 faces upward, as shown in Figure 2 、 Figure 6 、 Figure 7 Then, the flange plate 200 is screwed onto the threaded hole 111 arranged on the gearbox 100 by using the bolt 240, and a sealing ring 250 is arranged between the flange plate 200 and the gearbox 100 to prevent oil leakage.

[0080] Then, the output shaft of the motor 300 is assembled to the input shaft of the gearbox 100 through the spline 320, and then the housing 310 of the motor is screwed onto the threaded hole 241 arranged on the flange plate 200 by using the bolt 330. A sealing ring 260 is arranged between the housing 310 of the motor and the flange plate 200 to prevent oil leakage.

[0081] Then, the first pipe port 401 of the hollow pipe 400 is installed on the second air port 222 of the flange plate 200, and the hollow pipe 400 is higher than the flange plate 200, and the second pipe port 402 of the hollow pipe 400 is higher than the first pipe port 401.

[0082] Next, the respirator 500 is installed at the second port 402 of the hollow tube 400, or installed at the second port 402 of the hollow tube 400 via an extension hose, and the position of the respirator is raised to complete the assembly process.

[0083] When the motor 300 is running, the motor's output shaft rotates, driving the input shaft 120 of the gearbox 100 to rotate via the spline 320. During rotation, the oil in the cavity 210 is fully thrown up. When some oil enters the first air passage 221 through the gap 231 and flows along the air passage 220 towards the second air passage 222, because the air passage 220 is designed as a zigzag shape and the second air passage 222 is higher than the first air passage 221, some oil will fall back into the cavity 210 first due to the obstruction of the air passage 220, and will not enter the hollow tube 400. This reduces the amount of oil entering the hollow tube 400 and lowers the probability of oil leakage.

[0084] A small amount of oil entering the hollow tube 400 flows upward from the first port 401. When it encounters the baffle 420, it is blocked by the baffle 420 and will not continue to flow towards the second port 402, thus solving the oil leakage problem of the gearbox 100.

[0085] After the gearbox 100 has been running for a period of time, the pressure inside the housing 110 increases. The gas inside the housing is discharged to the outside through the air passage 220, hollow tube 400 and breather 400 to reduce the pressure inside the housing 110 and ensure the normal operation of the gearbox 100 and motor 300.

[0086] Conversely, when the pressure inside the housing 110 decreases and forms a negative pressure, the outside air can be filtered out of pollutants by the respirator 400, enter the hollow tube 400, and then enter the cavity 210 through the hollow tube 400 and the airway 220, and further enter the gearbox housing 110 through the cavity 210 to balance the internal and external air pressure of the housing 110.

[0087] During routine cleaning and maintenance, the hollow tube 400 and the breather 500 can be directly removed from the flange 200 for cleaning or replacement, thereby improving the efficiency of cleaning and maintenance.

[0088] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A gearbox ventilation structure, the gearbox having a housing, on which a flange is disposed; the flange is used for assembly and fixation with a motor housing, and together with the motor housing, forms a closed cavity; Its features are, The ventilation structure includes: The air passage is formed on the flange and has two openings, namely the first air passage opening and the second air passage opening; wherein, the first air passage opening is connected to the cavity and the second air passage opening is formed on the outer wall of the flange. A hollow tube with an external flange and an internal cavity forming a connected labyrinth structure. The hollow tube has openings at both ends to form a first port and a second port, with the first port connected to the second airway port. The respirator is connected to the second port of the hollow tube and has a built-in filter for exchanging gas between the cavity and the outside gas and blocking external pollutants.

2. The gearbox ventilation structure according to claim 1, characterized in that, The gearbox has an input shaft that is supported by bearings on the housing and extends into the cavity for connecting the output shaft of the motor. An oil injection channel is provided in the housing, and a drain oil channel is provided on the flange. The drain oil channel is connected to the oil injection channel, receives oil from the oil injection channel, and injects it into the cavity.

3. The gearbox ventilation structure according to claim 2, characterized in that, A pair of aligned oil return holes are provided at corresponding positions on the flange and the housing to form an oil return channel, which is used to allow the oil in the cavity to flow back to the housing.

4. The gearbox ventilation structure according to claim 1, characterized in that, The airway is zigzag-shaped, with the second airway opening higher than the first airway opening; After the hollow tube is installed at the second airway opening, its second opening is higher than its first opening.

5. The gearbox ventilation structure according to any one of claims 1 to 4, characterized in that, The flange has a recessed cavity in the middle area, and a shoulder is formed on the inner wall of the cavity, extending radially toward the center of the cavity. The first air passage is opened on the shoulder, and a gap is formed between the shoulder and the motor housing after the motor is installed on the flange.

6. The gearbox ventilation structure according to claim 5, characterized in that, The gap is between 4mm and 8mm.

7. The gearbox ventilation structure according to any one of claims 1 to 4, characterized in that, At least two partitions are provided in the inner cavity of the hollow tube. Adjacent partitions are spaced apart along the axial direction of the hollow tube. The adjacent partitions extend parallel to each other from the opposite sidewall of the inner cavity of the hollow tube toward the center of the hollow tube and terminate beyond the center of the hollow tube. The terminating edge is suspended. The peripheral side of the partition, except for the terminating edge, is connected to the inner cavity wall of the hollow tube.

8. The gearbox ventilation structure according to claim 7, characterized in that, The hollow tube is divided into an upper section and a lower section, the lower section is connected to the second airway opening, and the upper section is connected to the respirator; The partition includes two, which are placed in the inner cavities of the upper and lower sections respectively and are adjacent to the docking positions of the upper and lower sections; The lower section has a variable-diameter cavity that is narrower at the bottom and wider at the top.

9. The gearbox ventilation structure according to any one of claims 1 to 4, characterized in that, An extension hose is installed between the hollow tube and the respirator to elevate the respirator.

10. A gearbox, characterized in that, It is equipped with a gearbox ventilation structure as described in any one of claims 1 to 9.

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