Gearbox lubrication structure

Abstract

The present application discloses a lubrication structure of a gearbox, and relates to the technical field of lubrication structures. The present application includes a housing, an external member, and a coupling. The housing has a first cavity, and an inner shaft is provided in the housing; the external member has an outer shaft; the coupling connects the inner shaft and the outer shaft together, and the coupling has a second cavity; wherein an oil passage penetrating the inner shaft is provided on the inner shaft, and the oil passage connects the first cavity with the second cavity. The present application can lubricate the coupling through the lubricating oil inside the housing of the gearbox, thereby reducing maintenance costs.

Description

Technical Field

[0001] The present application relates to the technical field of lubrication structures, and in particular to a lubrication structure of a gear box. Background Art

[0002] In gearboxes, especially rail transit gearboxes, couplings are generally used to transmit the torque of the motor to the gearbox, ultimately driving the operation of trains and other equipment.

[0003] In the prior art, the coupling is usually lubricated by an independent lubrication system. A sealed cavity is provided in the coupling, and the coupling is lubricated by filling lubricating oil or grease in the sealed cavity, which results in high maintenance costs. Summary of the invention

[0004] The purpose of the present application is to provide a lubrication structure for a gear box, which can lubricate the coupling through the lubricating oil inside the gear box shell, thereby reducing maintenance costs.

[0005] The embodiment of the present application is implemented as follows:

[0006] A lubrication structure for a gearbox includes a box shell, an external component and a coupling, wherein the box shell has a first cavity, an internally connected shaft is provided in the box shell; the external component has an externally connected shaft; the coupling connects the internally connected shaft and the externally connected shaft together, and the coupling has a second cavity; wherein the internally connected shaft is provided with an oil passage that passes through the internally connected shaft, and the oil passage connects the first cavity with the second cavity.

[0007] In one embodiment, the coupling includes a connecting inner gear ring, an inner outer gear ring and an outer outer gear ring, the inner outer gear ring is meshed with the connecting inner gear ring for connecting to the inner shaft; the outer outer gear ring is meshed with the connecting inner gear ring for connecting to the outer shaft.

[0008] In one embodiment, the coupling includes an oil baffle plate having a first through hole for the circumscribed shaft or the circumscribed external gear ring to pass through, and the oil baffle plate is connected to the housing.

[0009] In one embodiment, a connecting member is provided on the external connecting member, and the connecting member is arranged around the external connecting shaft and connected to the box shell.

[0010] In one embodiment, a mounting hole is provided on the housing, and the lubrication structure of the gear box includes a bearing, a bearing seat and a transparent cover, the bearing seat is provided in the mounting hole, the bearing sleeve is provided on the inscribed shaft and installed in the bearing seat, the transparent cover has a second through hole for the inscribed shaft or the inscribed external gear ring to pass through, and is connected to the housing, wherein the oil baffle plate and the transparent cover form a third cavity, and the connecting piece and the oil baffle plate form a fourth cavity.

[0011] In one embodiment, an oil return chamber and a first oil return hole are provided on the shell wall of the box shell, the oil return chamber is communicated with the first chamber, and the first oil return hole communicates the oil return chamber with the third chamber.

[0012] In one embodiment, the cross section of the oil return chamber is trapezoidal, and the inner diameter of the oil return chamber decreases gradually along the direction from the first chamber to the third chamber.

[0013] In one embodiment, a second oil return hole is provided on the shell wall of the box shell, and the second oil return hole communicates with the oil return chamber and the fourth chamber.

[0014] In one embodiment, the oil passage is provided with a reamer at one end connected to the first chamber.

[0015] In one embodiment, a protrusion is provided on the inner wall of the oil passage at one end close to the first cavity.

[0016] In one embodiment, the lubrication structure of the gearbox includes a second shaft and an oil-slinging gear, wherein the second shaft is disposed in the box housing, and the oil-slinging gear is disposed on the second shaft for throwing oil into the oil passage.

[0017] In one embodiment, the oil-slinging gear and the oil passage are located on the same straight line.

[0018] In one embodiment, a first bevel gear is disposed on the inscribed shaft, a second bevel gear is disposed on the second shaft, and the first bevel gear is meshed with the second bevel gear.

[0019] Compared with the prior art, the present application has the following beneficial effects: the present application introduces the lubricating oil inside the gearbox housing into the coupling through the oil passage, so that the coupling can be lubricated by the lubricating oil inside the gearbox housing, reducing the maintenance cost, so that the coupling does not need to be disassembled for maintenance, and only the gearbox housing needs to be replaced with the lubricating oil, thus achieving maintenance-free coupling, and having a simple structure, and having good lubrication effect through test verification, greatly improving the service life of the coupling, and reducing maintenance costs. In addition, there is no need to set up an independent lubrication system in the coupling, thereby saving the axial space of the coupling, reducing the space occupied by the coupling, and reducing the volume of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a lubrication structure of a gear box according to an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of a lubrication structure of a gear box according to an embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of a lubrication structure of a gear box according to an embodiment of the present application;

[0024] Figure 4 A schematic structural diagram of a lubrication structure of a gear box according to an embodiment of the present application.

[0025] Icons: 100 - lubrication structure of gearbox; 200 - housing; 210 - mounting hole; 220 - oil return chamber; 230 - first oil return hole; 240 - second oil return hole; 250 - bearing seat; 251 - bearing; 252 - bushing; 260 - cover; 261 - second through hole; 262 - first bolt; 300 - external part; 310 - external shaft; 320 - connecting part; 400 - internal shaft; 410 - oil channel; 411 - expansion hole; 412 - protrusion; 41 3-first bevel gear; 500-coupling; 510-connecting inner gear ring; 520-inner outer gear ring; 530-outer outer gear ring; 540-oil baffle; 541-first through hole; 542-third bolt; 550-locking nut; 600-second shaft; 610-second bevel gear; 611-second bolt; 620-oil throwing gear; 710-first cavity; 720-second cavity; 730-third cavity; 740-fourth cavity; P1-straight line; P2-oil level. DETAILED DESCRIPTION

[0026] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0029] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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, and it can be the internal connection of two elements.

[0030] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0031] Please refer to Figure 1 , which is a schematic diagram of the structure of a lubrication structure 100 of a gearbox according to an embodiment of the present application. A lubrication structure 100 of a gearbox includes a housing 200, an external member 300 and a coupling 500, wherein the housing 200 has a first cavity 710, an inner shaft 400 is provided in the housing 200; the external member 300 has an outer shaft 310; the coupling 500 connects the inner shaft 400 and the outer shaft 310 together, and the coupling 500 has a second cavity 720; wherein an oil passage 410 penetrating the inner shaft 400 is provided on the inner shaft 400, and the oil passage 410 connects the first cavity 710 with the second cavity 720.

[0032] In this embodiment, the lubricating oil inside the gearbox housing 200 is introduced into the coupling 500 through the oil passage 410, so that the coupling 500 can be lubricated by the lubricating oil inside the gearbox housing 200, thereby reducing the maintenance cost, so that the coupling 500 does not need to be disassembled for maintenance, and only the gearbox housing 200 needs to be replaced with lubricating oil, thereby achieving maintenance-free coupling 500, and having a simple structure. Moreover, through experimental verification, the lubrication effect is good, the service life of the coupling 500 is greatly improved, and the maintenance cost is reduced. In addition, there is no need to set up an independent lubrication system in the coupling 500, thereby saving the axial space of the coupling 500, reducing the space occupied by the coupling 500, and reducing the volume of the gearbox.

[0033] In the embodiment, the external component 300 can be a driving device such as a driving motor or a hydraulic motor, and the internal shaft 400 is the input shaft of the gearbox. The external component 300 can be an output device such as a tool or a wheel, and the internal shaft 400 is the output shaft of the gearbox. The lubrication structure 100 of the gearbox can be applied to gearboxes such as rail transit gearboxes, reducers, or machine tool gearboxes.

[0034] Please refer to Figure 2 , which is a schematic diagram of the structure of the lubrication structure 100 of the gearbox shown in an embodiment of the present application. The lubrication structure 100 of the gearbox includes a second shaft 600 and an oil-slinging gear 620. The second shaft 600 is arranged in the housing 200. The oil-slinging gear 620 is arranged on the second shaft 600 and is used to throw the oil into the oil passage 410. A first bevel gear 413 is arranged on the inscribed shaft 400, and a second bevel gear 610 is arranged on the second shaft 600. The first bevel gear 413 is meshed with the second bevel gear 610. Among them, the oil-slinging gear 620 is arranged below the second bevel gear 610, and the pitch circle diameter of the oil-slinging gear 620 is smaller than the pitch circle diameter of the second bevel gear 610.

[0035] In an operation process, the gearbox lubrication structure 100 is applied to a rail transit gearbox and uses splash lubrication. When the train is running, the external shaft 310 drives the internal shaft 400 to rotate through the coupling 500, the internal shaft 400 drives the second bevel gear 610 to rotate through the first bevel gear 413, the second bevel gear 610 drives the second shaft 600 to rotate, and the oil-slinging gear 620 rotates with the rotation of the second shaft 600.

[0036] The rotating second bevel gear 610 stirs up the lubricating oil inside the gearbox housing 200, and part of the lubricating oil flows along the second bevel gear 610 to the oil-throwing gear 620. When the oil-throwing gear 620 rotates, it throws the oil into the oil passage 410, and the lubricating oil enters the coupling 500 through the oil passage 410, thereby providing lubrication for the coupling 500.

[0037] In this embodiment, the oil passage 410 is located on the center line of the input gear shaft, and the oil-flinging gear 620 and the oil passage 410 are located on the same straight line P1, that is, the installation position of the oil-flinging gear 620 is aligned with the oil passage 410, so that the distance between the oil-flinging gear 620 and the oil passage 410 is closer, which is beneficial for the oil-flinging gear 620 to throw the oil into the oil passage 410, so that the lubricating oil entering the oil passage 410 is more balanced.

[0038] In the embodiment, the first bevel gear 413 and the inscribed shaft 400 can be integrally formed, or they can be fixed together by key connection, thread connection, etc. The oil-slinging gear 620 and the second shaft 600 can be integrally formed, or they can be fixed together by key connection, thread connection, etc. The second bevel gear 610 and the second shaft 600 can be integrally formed, or they can be fixed together by key connection, thread connection, etc. In the present embodiment, the second bevel gear 610 is fixed to the second shaft 600 by a second bolt 611.

[0039] The oil passage 410 is provided with a reaming hole 411 at the end connected with the first cavity 710, and the reaming hole 411 can be formed by chamfering the opening of the oil passage 410. The oil passage 410 is provided with a protrusion 412 on the inner wall of the end close to the first cavity 710, and the protrusion 412 is annular and is arranged close to the reaming hole 411. Therefore, the oil passage 410 has the reaming hole 411 at the opening, so that the lubricating oil can easily enter the oil passage 410, and the oil passage 410 reaches the protrusion 412 after the reaming hole 411. At this time, the aperture of the oil passage 410 is reduced, so that the lubricating oil entering the oil passage 410 is not easy to flow back. In this embodiment, the surface of the protrusion 412 is in an arc shape.

[0040] The coupling 500 includes a connecting inner gear ring 510, an inner outer gear ring 520 and an outer outer gear ring 530. The inner outer gear ring 520 is sleeved on the inner shaft 400 and connected to the inner shaft 400 by means of threads, tooth meshing, etc. The outer outer gear ring 530 is sleeved on the outer shaft 310 and connected to the outer shaft 310 by means of threads, tooth meshing, etc. The inner outer gear ring 520 and the outer outer gear ring 530 are both connected to the connecting inner gear ring 510, so that the inner shaft 400 is transmission-connected to the outer shaft 310. Among them, the connecting inner gear ring 510, the inner outer gear ring 520 and the outer outer gear ring 530 are coaxially arranged.

[0041] Please refer to Figure 3 , which is a schematic diagram of the structure of the lubrication structure 100 of the gearbox shown in an embodiment of the present application. A mounting hole 210 for mounting the inscribed shaft 400 is provided on the housing 200, and the lubrication structure 100 of the gearbox includes a bearing seat 250, a transparent cover 260, a sleeve 252 and at least one bearing 251, and the bearing seat 250 is arranged in the mounting hole 210. The bearing 251 is sleeved on the inscribed shaft 400 and installed in the bearing seat 250. The sleeve 252 is sleeved on the inscribed shaft 400 and is used to fix the bearing 251. The transparent cover 260 has a second through hole 261 for the inscribed shaft 400 or the inscribed outer gear ring 520 to pass through, and is fixedly connected to the housing 200 and the bearing seat 250 by a first bolt 262. In this embodiment, the inscribed outer gear ring 520 is penetrated in the second through hole 261.

[0042] The coupling 500 includes an oil baffle plate 540, which has a first through hole 541 for the circumscribed shaft 310 or the circumscribed external gear ring 530 to pass through. The oil baffle plate 540 is connected to the housing 200 by a third bolt 542, and is used to prevent the lubricating oil from splashing onto the external component 300, and prevent the lubricating oil inside the housing 200 of the gear box from leaking outward. In this embodiment, the circumscribed external gear ring 530 is inserted into the first through hole 541. The aperture of the first through hole 541 is greater than or equal to the circumscribed external gear ring 530.

[0043] The external member 300 is provided with a connecting member 320, which may be a cylindrical structure, arranged around the external shaft 310 and connected to the housing 200, and used to seal the connection between the gear housing 200 and the external member 300, thereby preventing the lubricating oil from leaking outward. The external member 300 and the connecting member 320 may be integrated.

[0044] The area enclosed by the oil baffle plate 540 and the transparent cover 260 is the third cavity 730 , and the area enclosed by the connecting member 320 and the oil baffle plate 540 is the fourth cavity 740 .

[0045] An oil return chamber 220 and a first oil return hole 230 are provided on the shell wall of the housing 200. The oil return chamber 220 is communicated with the first chamber 710, and the first oil return hole 230 communicates the oil return chamber 220 with the third chamber 730. The lubricating oil entering the second chamber 720 of the coupling 500 will enter the third chamber 730 through the rotation between the inner gear ring 510, the inner outer gear ring 520 and the outer outer gear ring 530. At this time, the lubricating oil can flow into the oil return chamber 220 through the first oil return hole 230, and flow back to the first chamber 710 of the housing 200. In this embodiment, the oil return chamber 220 is arranged below the mounting hole 210, which is conducive to oil return. The inner surface of the oil baffle 540 is arc-shaped and has an inclined surface to facilitate oil return. A plurality of first oil return holes 230 are provided, and all are inclined to facilitate oil return.

[0046] A second oil return hole 240 is provided on the shell wall of the housing 200, and the second oil return hole 240 connects the oil return chamber 220 and the fourth chamber 740. When the aperture of the first through hole 541 is larger than the circumscribed outer gear ring 530, a gap is left between the oil baffle plate 540 and the circumscribed outer gear ring 530, and a small amount of lubricating oil will flow into the fourth chamber 740 through the gap. At this time, the lubricating oil can flow into the oil return chamber 220 through the second oil return hole 240, and flow back to the first chamber 710 of the housing 200. Among them, the setting of the oil return chamber 220, the first oil return hole 230 and the second oil return hole 240 enables the lubricating oil to return to the bottom of the housing 200 of the gear box in time, and the coupling 500 will not generate oil stirring loss.

[0047] In this embodiment, the cross-section of the oil return chamber 220 is trapezoidal, and the inner diameter of the oil return chamber 220 decreases successively along the direction from the first chamber 710 to the third chamber 730, that is, the inner wall of the oil return chamber 220 has a certain inclination angle, which is beneficial for the lubricating oil to quickly flow from the oil return chamber 220 back to the first chamber 710 of the housing 200.

[0048] Please refer to Figure 4 , which is a schematic diagram of the structure of the lubrication structure 100 of the gearbox according to an embodiment of the present application. A locking nut 550 is threadedly connected to the end of the internal shaft 400. The locking nut 550 is arranged between the internal outer gear ring 520 and the external outer gear ring 530, and abuts against the internal outer gear ring 520. The locking nut 550 is used for axial positioning of the internal shaft 400. In one embodiment, the height of the oil level P2 in the first chamber 710 of the housing 200 is lower than the height of the oil return chamber 220.

[0049] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lubrication structure for a gear box, characterized in that: include: A box shell has a first cavity, and an inscribed shaft is arranged in the box shell; An external connecting member having an external connecting shaft, on which a connecting member is disposed, the connecting member is disposed around the external connecting shaft and is connected to the box shell; and A coupling connects the inner shaft and the outer shaft together, the coupling has a second cavity, the inner shaft is provided with an oil passage penetrating the inner shaft, the oil passage connects the first cavity with the second cavity, the coupling comprises: a connecting inner gear ring; an inner outer gear ring meshing with the connecting inner gear ring and used to be connected to the inner shaft; an outer outer gear ring meshing with the connecting inner gear ring and used to be connected to the outer shaft; and an oil baffle having a first through hole for the outer shaft or the outer outer gear ring to pass through, the oil baffle being connected to the housing; A bearing seat, wherein the housing is provided with a mounting hole, and the bearing seat is arranged in the mounting hole; A bearing, sleeved on the inscribed shaft and installed in the bearing seat; A transparent cover having a second through hole for the inner-connected shaft or the inner-connected outer gear ring to pass through, and connected to the box shell; The oil baffle plate and the transparent cover form a third cavity, the connecting piece and the oil baffle plate form a fourth cavity, the oil channel is provided with an expansion hole at the end connected to the first cavity, and the oil channel is provided with a protrusion on the inner wall of the end close to the first cavity.

2. The lubrication structure of the gear box according to claim 1, characterized in that: An oil return chamber and a first oil return hole are provided on the shell wall of the box shell. The oil return chamber is communicated with the first chamber, and the first oil return hole communicates the oil return chamber with the third chamber.

3. The lubrication structure of the gear box according to claim 2, characterized in that: The cross section of the oil return chamber is trapezoidal, and the inner diameter of the oil return chamber decreases gradually along the direction from the first chamber to the third chamber.

4. The lubrication structure of the gear box according to claim 2, characterized in that: A second oil return hole is provided on the shell wall of the box shell, and the second oil return hole communicates with the oil return chamber and the fourth chamber.

5. The lubrication structure of the gear box according to any one of claims 1 to 4, characterized in that: include: A second shaft is disposed in the housing; as well as The oil-slinging gear is arranged on the second shaft and is used for swinging the oil into the oil passage.

6. The lubrication structure of the gear box according to claim 5, characterized in that: The inscribed shaft is provided with a first bevel gear, the second shaft is provided with a second bevel gear, and the first bevel gear is meshed with the second bevel gear.

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