Gear box and gear box

Abstract

The present application provides a gear box and a gear box, which relate to the field of rail transit gear boxes. The gear box includes: a cavity, part of which is formed into a layer of oil pool; a second layer of oil pool, which is connected to the first inner wall of the cavity; an oil filling hole, which is arranged on the second inner wall of the cavity; and the gear box also includes: a guide structure, which connects the oil filling hole and the second layer of oil pool, and is arranged so that there is a clear space between the second layer of oil pool and the second inner wall. The gear box uses the guide structure to ensure that the oil filling hole fills the second layer of oil pool with oil, and can use the clear space to clean the surface of the gear box after casting that cannot be cleaned due to the obstruction of the second layer of oil pool in the prior art, thereby improving the processability of the gear box. And there is no need to set a process hole to clean the inner wall of the box between the second layer of oil pool and the first layer of oil pool as in the prior art, so as to avoid oil leakage from the process hole, simplify the box structure, improve the casting process, and reduce production costs.

Description

Technical Field

[0001] The present application relates to the field of rail transit gearboxes, and in particular to a gearbox body and a gearbox. Background Art

[0002] Rail transit gearboxes are usually lubricated by splash lubrication. This splash lubrication process is usually that the bearings splash the lubricating oil through the large gears to lubricate the parts in the gearbox. For some two-stage reduction gearboxes, due to the height difference between the top circle of the first-stage large gear and the top circle of the second-stage large gear, in order to better lubricate the gears and bearings, an oil pool for lubricating the first-stage gear and an oil pool for lubricating the second-stage gear will be set on the box body. Usually, the first-stage gear lubrication can directly use the bottom shell of the box body as the oil pool, and the second-stage gear lubrication requires another lubricating oil pool to be set on the top of the first-stage gear lubricating oil pool for lubrication.

[0003] When filling the gearbox with oil, it is most convenient to fill the oil through the tail of the gearbox. Therefore, the oil filling hole of the rail transit gearbox is generally set at the tail of the gearbox. At the same time, due to the requirements of the casting process, the main parting surface of the box casting is generally in the middle of the box, and the center of the oil filling hole is overlapped with the parting surface to facilitate the casting of the box. This also leads to the position of the oil filling hole being limited to the middle position of the tail of the box. In this case, it is necessary to seek a new two-layer oil pool structure to optimize the processability of the box.

[0004] like Figure 6 and Figure 7 In the structure of the existing two-layer oil pool shown, the two-layer oil pool is connected to both inner side walls of the box body, and oil can be directly injected into the two-layer oil pool through the oil injection hole. The inner surface between the two-layer oil pool and the bottom shell of the box body (i.e., the first-layer oil pool) is difficult to clean. In one solution, it is proposed to open another process hole at the tail of the first-layer oil pool to clean the casting residue. However, improper sealing of the process hole at a later stage increases the risk of additional lubricating oil leakage and increases production costs. Summary of the invention

[0005] The first purpose of the present application is to provide a gear housing to achieve better processability.

[0006] The second object of the present application is to provide a gearbox, comprising the above gearbox body.

[0007] In a first aspect, the present application provides a gear housing, the gear housing comprising:

[0008] a cavity, a portion of the cavity being formed as a layer of oil pool;

[0009] A second oil pool connected to the first inner wall of the cavity;

[0010] An oil filling hole is provided on the second inner wall of the cavity;

[0011] The gear housing also includes:

[0012] The guide structure connects the oil filling hole and the second oil pool and is configured so that there is a clear space between the second oil pool and the second inner wall.

[0013] Preferably, part of the second-layer oil pool, part of the guide structure and part of the first inner side wall jointly contribute to defining the clear space.

[0014] Preferably, in the direction in which the second-layer oil pool extends outward from the first inner side wall, the size of the guide structure is smaller than the size of the second-layer oil pool.

[0015] Preferably, the direction in which the oil injected into the cavity from the oil injection hole flows along the guide structure toward the second-layer oil pool is defined as the predetermined direction;

[0016] The guide structure is formed with a guide portion extending along the predetermined direction, and the guide portion at least helps to prevent the oil from escaping from the guidance of the guide structure.

[0017] Preferably, the gear housing further comprises:

[0018] A collecting structure, wherein the collecting structure is at least arranged on the second inner wall and is at least used for collecting the oil splashed to the inner part of the cavity into the second-layer oil pool.

[0019] Preferably, the collecting structure is connected to the guiding structure.

[0020] Preferably, a plane passing through the axis of the oil filling hole is defined as a reference plane;

[0021] The collecting structure includes a collecting member disposed on a first side and / or a second side of the reference plane.

[0022] Preferably, the collecting member is formed with a collecting portion for collecting the oil;

[0023] A portion of the second inner sidewall is formed as a portion of the collecting member for defining the collecting portion; or a portion of the collecting member for defining the collecting portion is connected to the second inner sidewall.

[0024] Preferably, the collecting structure is configured to transport the oil to the guiding structure by utilizing gravity.

[0025] In a second aspect, the present application provides a gearbox, comprising the gearbox body as described above.

[0026] The gear housing provided in this embodiment uses a guide structure to ensure that the oil filling hole fills the second oil pool with oil, and the guide structure is set to allow a clear space between the second oil pool and the second inner wall, so that the clear space can be used to clean the casting residues and oxide scales and other debris that cannot be cleaned in the prior art due to the shielding of the second oil pool after the gear housing is cast, thereby improving the processability of the gear housing. In addition, it is not necessary to set a process hole to clean the casting residues and oxide scales and other debris between the second oil pool and the first oil pool as in the prior art, thus avoiding the occurrence of oil leakage from the process hole, optimizing the cover plate of the process hole, simplifying the housing structure, improving the casting process, and reducing the processing cost.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A schematic diagram showing a top view of a gear housing;

[0030] Figure 2 Shows Figure 1 Schematic diagram of a cross-sectional view from a medium AA perspective;

[0031] Figure 3 Shows Figure 2 A schematic diagram of a cross-sectional view from the perspective of the middle BB;

[0032] Figure 4 Shows Figure 2 A schematic diagram of a gear and lubricating oil is provided;

[0033] Figure 5 A schematic diagram showing a cross-sectional view of the gear housing from another perspective with a portion of the shaft system installed;

[0034] Figure 6 A schematic diagram showing a cross-sectional view of a gear housing in the prior art is shown;

[0035] Figure 7 A schematic diagram of a top view of a gear housing in the prior art is shown.

[0036] Reference numerals:

[0037] 1-box body; 11-first inner wall; 12-second inner wall; 2-first layer oil pool; 21-first oil plug; 3-second layer oil pool; 31-second oil plug; 4-guiding structure; 5-oil filling hole; 6-collecting component; 7-clear space; 81-first stage gear; 82-second stage gear; 9-shaft component. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] The gear housing provided in this embodiment includes a housing body, a two-layer oil pool, a guide structure, a collection structure, a first-layer oil pool and an oil injection hole. The connection relationship and working principle of these structures will be described in detail below.

[0043] like Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram showing a top view of a gear housing, Figure 2 Shows Figure 1 Schematic diagram of a cross-sectional view from the AA perspective. Specifically, see in particular Figure 2 The box body 1 is formed with a cavity, the cavity is used to install the gear, the gear has an axial direction, Figure 1 The cross-sectional view given in is obtained by cutting the gear housing with a plane perpendicular to the aforementioned axial direction and passing through the axis of the oil filling hole 5 described below. Figure 1 ,exist Figure 1 In the example given, the box body 1 has two semicircular notches, which are used to install the aforementioned gears and corresponding shafts, bearings and seals. Therefore, it can be understood that the two semicircular notches correspond to the two-stage gears respectively. For the convenience of description, refer to Figure 4 ( Figure 4 The positional relationship between the two-stage gears and the two-layer oil pools and the setting of the lubricating oil are given, and the gear on the left is defined as the first-stage gear 81, and the gear on the right is defined as the second-stage gear 82.

[0044] Still see Figure 2 , as described above, Figure 2 The gearbox shown is a two-stage gearbox, and this will be used as an example in the following description. Figure 2 When the gearbox is working, the gearbox body Figure 2 Therefore, the bottom of the cavity of the box body 1, that is, the box bottom shell of the box body 1, can store lubricating oil and be used as a first-layer oil pool 2 for lubricating the first-stage gear 81. On this basis, in this embodiment, a second-layer oil pool 3 is formed above the first-layer oil pool 2 and at a position corresponding to the second-stage gear 82. The second-layer oil pool 3 is constructed to be able to store lubricating oil, for example, the second-layer oil pool 3 is constructed in a groove shape. Figure 1 , Figure 1 A schematic diagram of the top view of the gear box is given. Figure 1 When viewed from a perspective, the second oil pool 3 can be formed into a roughly rectangular shape, which is located Figure 1 The lower middle edge may be connected to the first inner wall 11 of the box body 1 .

[0045] Combination Figure 1 , Figure 2 and Figure 4 In the embodiment, the sources of the lubricating oil in the second oil pool 3 include two sources, one of which is the lubricating oil brought up by the gears when they rotate and splashed to the inner side of the gear box. The other source is the lubricating oil added to the second oil pool 3 through the oil injection hole 5. The latter case will be described first, and the former case will be specifically described in the subsequent description.

[0046] See also Figure 2 , the oil filling hole 5 is located at Figure 1The right side of the box body 1 (i.e., the tail of the box body, see the description in the background technology section), which penetrates the box body 1, so as to inject lubricating oil into the box body 1 through the oil injection hole 5. In the embodiment, the second oil pool 3 is connected to the guide structure 4, and the guide structure 4 is connected to the second inner side wall 12 of the box body 1 and corresponds to the position of the oil injection hole 5. In this way, when the lubricating oil is injected into the box body 1 through the oil injection hole 5, the lubricating oil is guided by the guide structure 4 and flows into the second oil pool 3 under the action of its own gravity, which makes the guide structure 4 form a substantial "oil channel".

[0047] See also Figure 1 , Figure 1 A schematic diagram of the structure of the guide structure 4 from a top view is given in FIG. Figure 2 ,exist Figure 1 and Figure 2 In the example given, the guide structure 4 can be formed into a substantially plate shape. In order to facilitate the specific description of the guide structure 4, the flow direction of the lubricating oil flowing to the second-layer oil pool 3 through the oil injection hole 5 is referred to as the oil injection direction. Figure 3 The figure is obtained by cutting the guide structure 4 and the collecting member 6 described below with a plane perpendicular to the oil injection direction. The upper surface of the plate-shaped guide structure 4 may further be formed with a recessed portion extending along the oil injection direction, for example, Figure 3 This helps to ensure that the lubricating oil is effectively restrained and guided by the guide structure 4, so that even when the oil injection operation is performed at a certain oil injection speed, the lubricating oil will not overflow from the edge of the guide structure 4 perpendicular to the oil injection direction and fail to flow into the second-layer oil pool 3.

[0048] See also Figure 1 The dimension of the plate-shaped guide structure 4 in the direction perpendicular to the oil injection direction can be defined as the width of the guide structure 4. In the embodiment, the width of the guide structure 4 is smaller than the width of the second layer oil pool 3. Figure 7 Compared with the existing two-layer oil pool shown in the figure, the gear box body will be lighter. At the same time, this arrangement is also conducive to setting the following clear space 7.

[0049] As described above, the inner wall of the housing body 1 connected to the second oil pool 3 is the first inner wall 11. In the embodiment, the guide structure 4 and the first inner wall 11 participate in defining a clear space 7. The clear space 7 here refers to the clear space 7 through which the first oil pool 2 can be observed after the gear housing is cast. The clear space 7 can be configured to clean the casting residues and oxide scales between the first oil pool 2 and the second oil pool 3, for example, by using a tool to penetrate the clear space 7 to clean the aforementioned casting residues and oxide scales. This makes it unnecessary to Figure 6As in the prior art shown in the figure, due to the obstruction of the second oil pool, it is forced to open a process hole on the first inner side wall of the housing body between the first oil pool and the second oil pool for cleaning. Therefore, the clear space 7 provided in this way allows the step of opening the process hole to be omitted when producing the gear housing, thereby improving production efficiency, avoiding the risk of additional lubricating oil leakage caused by the process hole, and eliminating the need to set a cover plate for the process hole, which is conducive to reducing production costs.

[0050] In addition, see Figure 1 In the embodiment, the guide structure 4 extends between the second oil pool 3 and the inner wall of the box body 1 where the oil filling hole 5 is opened, and plays the role of a "bridge" to guide the lubricating oil. Figure 7 In the embodiment, the second oil pool is completely connected to the second inner wall of the housing body. Since the present embodiment provides the above-mentioned net space 7, when the gear housing of the same size and the edge of the second oil pool facing away from the second inner wall are in the same position, the second oil pool 3 has a smaller volume, which also reduces the overall weight of the gear housing. In addition, the amount of oil stored in the second oil pool 3 is also reduced, which enables the second oil pool 3 to obtain the same oil level as in the prior art by adding less lubricating oil relative to the prior art, effectively improving the utilization rate of the lubricating oil.

[0051] Based on the above-described features, another source of lubricating oil of the second-layer oil pool 3 and its related structure will be described in detail below. The other source of lubricating oil of the second-layer oil pool 3 mentioned here refers to the "lubricating oil brought up when the gear rotates and splashed to the inner side of the gear box" mentioned above. In this embodiment, the collection structure is used to collect the lubricating oil into the second-layer oil pool 3.

[0052] Specifically, see Figure 1 , the collecting structure may be at least arranged on the inner side wall of the box body 1 where the oil injection hole 5 is opened, for example, the collecting structure is only arranged on the inner side wall of the box body 1 where the oil injection hole 5 is opened. Here, the plane passing through the axis of the oil injection hole 5 is used as the reference plane, and the collecting structure may include two collecting members 6 respectively located on both sides of the reference plane, and the collecting members 6 are further formed with a collecting groove. The side of the collecting member 6 in a direction perpendicular to its own extension direction (the extension direction may also be formed as the extension direction of the collecting groove) may be connected to the second inner side wall 12 (this may be beneficial to improve the rigidity of the collecting member 6), or part of the second inner side wall 12 may be formed as the side of the collecting member 6 in a direction perpendicular to the aforementioned extension direction. For the latter arrangement, it may be more conducive to the casting of the collecting member 6.

[0053] It can be understood that, when two collecting members 6 are arranged in the above manner, Figure 1The collecting member 6 in the middle and lower part and the part of the second oil pool 3 also participate in defining the net space 7. Of course, as another option, only Figure 1 The collecting member 6 in the middle and upper part is used to obtain a larger clear space 7, thereby further improving the efficiency of cleaning the casting residues, oxide scale and other debris.

[0054] Further, see Figure 1 The collecting member 6 is connected to the guiding structure 4 so that the collecting member 6 can transport the lubricating oil splashed to the inner side of the box body 1 to the guiding structure 4 through the collecting groove, and then the guiding structure 4 guides this part of the lubricating oil to the second oil pool 3. Preferably, as Figure 3 As shown, when viewed along the oil injection direction, the collecting member 6 is inclined downward (this is still Figure 5 This is particularly shown in the figure), which is conducive to efficiently conveying the lubricating oil to the guide structure 4. In the embodiment, due to the reduction in the volume of the second-layer oil pool 3, there may be a situation where the amount of lubricating oil splashed to the inner side of the box body 1 by the second-layer oil pool 3 is slightly reduced, but the setting of the collecting member 6 well avoids the occurrence of such a situation, which is particularly beneficial for maintaining the oil level of the second-layer oil pool 3.

[0055] like Figure 5 As shown, Figure 5 A cross-sectional view of a part of the shaft system installed in the gear box can be given, and the cutting method can be understood as cutting using a plane passing through the axis of the second-stage gear 82. Specifically, Figure 5 The second stage gear 82 and the shaft member 9 are shown in FIG. 1 , as well as their relative positional relationship with the second layer oil pool 3. Figure 5 As mentioned above, the collecting member 6 is inclined downward, so that the lubricating oil is effectively transported to the guiding structure 4 by the gravity of the lubricating oil itself. Figure 5 ,Although Figure 5 The lubricating oil is not shown in the figure, but when the second oil pool 3 is filled with oil, the lubricating oil will flow into the first oil pool 2. Figure 5 The oil drain port for draining the oil from the second oil pool 3 is shown, and the oil drain port is closed by a second oil plug 31. Figure 5 Also shown is an oil drain port for draining oil from the oil pool 2 , which is closed by a first oil plug 21 .

[0056] The gear housing provided in this embodiment has a clear space 7 between the second oil pool 3 and the inner side wall of the housing body 1 with the oil injection hole 5, so there is no need to set a process hole to clean the casting residues and scale between the second oil pool 3 and the first oil pool 2, thus avoiding the oil leakage of the process hole, optimizing the cover of the process hole, achieving weight reduction and reducing the processing cost. By setting a guide structure 4, the oil injection hole 5 is connected with the second oil pool 3, effectively solving the technical problem that the position of the oil injection hole 5 cannot be changed due to the limitation of the casting process, which limits the optimization of the structure of the second oil pool 3 (as mentioned in the background technology, the main parting surface of the housing casting is generally in the middle of the housing, and the center of the oil injection hole 5 is overlapped with the parting surface for easy housing casting), ensuring that the oil injection can still be guaranteed to be unaffected after the structure of the second oil pool 3 is optimized. In addition, the gear housing provided in this embodiment has a reduced volume of the second-layer oil pool 3, which further reduces the weight of the housing, reduces production costs, and also reduces energy consumption and oil injection during equipment operation, thereby saving lubricating oil.

[0057] This embodiment also provides a gear box, including the gear box body as above, and the beneficial effects also include the above beneficial effects, which will not be repeated here.

[0058] The above description is only a preferred embodiment of the present application, and does not limit the protection scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or direct / indirect application in other related technical fields are included in the protection scope of the present application.

Claims

1. A gear housing, comprising: a cavity, a portion of the cavity being formed as a layer of oil pool; A second oil pool connected to the first inner wall of the cavity; An oil filling hole is provided on the second inner wall of the cavity; Characterized in that the gear box also includes: a guide structure, connecting the oil filling hole and the second oil pool, and arranged so that there is a clear space between the second oil pool and the second inner side wall, wherein a portion of the second oil pool, a portion of the guide structure and a portion of the first inner side wall jointly define the clear space; The direction in which the oil injected into the cavity from the oil injection hole flows along the guide structure toward the second-layer oil pool is defined as a predetermined direction, and the guide structure is formed with a guide portion extending along the predetermined direction, and the guide portion at least helps to prevent the oil from escaping from the guidance of the guide structure; A collecting structure is provided at least on the second inner wall and is used to collect the oil splashed to the inner part of the cavity into the second oil pool.

2. The gear housing according to claim 1, characterized in that: In a direction in which the second-layer oil pool extends outward from the first inner side wall, a size of the guide structure is smaller than a size of the second-layer oil pool.

3. The gear housing according to claim 1, characterized in that: The collecting structure is connected to the guiding structure.

4. The gear housing according to claim 3, characterized in that: Define a plane passing through the axis of the oil filling hole as a reference plane; The collecting structure includes a collecting member disposed on a first side and / or a second side of the reference plane.

5. The gear housing according to claim 4, characterized in that: The collecting member is formed with a collecting portion for collecting the oil; A portion of the second inner side wall is formed as a portion of the collecting member for defining the collecting portion; Alternatively, a portion of the collecting member for defining the collecting portion is connected to the second inner side wall.

6. The gear housing according to claim 3, characterized in that: The collecting structure is configured to transport the oil toward the guiding structure using gravity.

7. A gear box, characterized in that: The gearbox comprises a gearbox body according to any one of claims 1 to 6.

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