Gearbox shell and gearbox

Abstract

The utility model relates to the technical field of gearboxes, and particularly discloses a gearbox shell and a gearbox, the gearbox shell comprises a box body and a shell body, and the box body is provided with an opening; the end face of one side, in the horizontal direction, of the shell is fixedly connected with the box to seal the opening, and a gear set and oil are arranged in the box. The end face of the other side, in the horizontal direction, of the shell is used for being matched with the driving motor in a sleeved mode, the shell is further provided with a through hole communicating the inner cavity with the opening, a rotating shaft of the driving motor is in transmission connection with the gear set through the through hole, the shell is provided with a ventilation pipeline, the inner cavity communicates with the external environment through the ventilation pipeline, and a respirator is arranged in the ventilation pipeline. Due to the fact that the ventilation pipeline is arranged in the inner cavity, the oil liquid is located in the box body, when the gear set stirs the oil liquid, only a small part of the oil liquid can enter the inner cavity, the problem that the oil liquid leaks through the ventilation hole can be effectively solved, the oil liquid entering the inner cavity can be guided into the box body again through the oil return opening, and therefore the oil liquid is prevented from leaking. And therefore, the oil can be effectively prevented from entering the driving motor.

Description

Technical Field

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

[0002] In existing electric loaders, in order to reduce the space for installing the drive motor and the gearbox and reduce the weight of the entire vehicle, the drive motor and the gearbox are usually integrated into one.

[0003] Since there are several transmission gears in the gearbox, when the drive motor drives the gearbox shaft to run at high speed, the air pressure and oil pressure in the gearbox will be too high. At present, in order to solve the problem of excessive air pressure and oil pressure in the gearbox, a breather hole for installing a breather is usually set on the gearbox case, and the breather is set in the breather hole to ensure the pressure inside and outside the case. However, when the high-pressure gas in the case is discharged through the breather, part of the high-pressure oil will be discharged through the breather, which will cause oil leakage from the breather.

[0004] In addition, due to the need for bearing lubrication, there will be oil accumulation in the inner cavity space formed by the connection between the gearbox and the motor. Under high temperature and high pressure conditions, there is a risk of accumulated oil flowing into the motor.

[0005] Therefore, there is an urgent need to improve the gearbox housing and optimize the breathing structure of the gearbox to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a gearbox housing and a gearbox to solve the problem in the related art that while the high-pressure gas in the box is discharged through the breather, part of the high-pressure oil will be discharged through the breather, thereby causing oil leakage, and due to the need for bearing lubrication, there will be oil accumulation in the inner cavity space formed by the connection between the gearbox and the motor. Under high temperature and high pressure conditions, the accumulated oil will flow into the motor.

[0007] In one aspect, the utility model provides a gearbox housing, the gearbox housing comprising:

[0008] A box body, wherein the box body is provided with an opening;

[0009] A shell, one side end face of the shell along the horizontal direction is fixedly connected to the box body to close the opening, and the box body is used to arrange a gear set and oil; the other side end face of the shell along the horizontal direction is used to be fixedly connected to the drive motor and enclose an inner cavity, and the shell is also provided with a through hole connecting the inner cavity and the opening, and the rotating shaft of the drive motor is used to pass through the through hole and be connected to the gear set in a driving manner. The shell is provided with an air ventilate pipeline, which connects the inner cavity with the external environment, and a respirator is used to be arranged in the air ventilate pipeline. The shell is also provided with an oil return port, which connects the inner cavity with the opening, and the oil return port is located below the through hole.

[0010] As an optimal technical solution for the gearbox housing, the inner cavity is located in the shell, and the shell is further provided with an annular fitting surface located on the outer periphery of the inner cavity, and the fitting surface is provided with an annular groove around its circumference, and the shell is provided with an air vent connecting the annular groove and the external environment, and the shell is provided with a through hole connecting the annular groove and the inner cavity, and the axis of the through hole is arranged at an angle to the axis of the air vent, the fixing ring of the drive motor is used to fit with the fitting surface and be fixedly connected to the shell, and the groove wall of the annular groove is used to form an annular tube with the fixing ring, the air vent, the annular tube and the through hole are connected in sequence and constitute the air vent pipeline, and the air vent is used to set a respirator.

[0011] As a preferred technical solution for the gearbox housing, the mating surface is provided with a groove along the horizontal direction, and the groove wall of the groove is used to surround the fixing ring to form the through hole.

[0012] As a preferred technical solution for the gearbox housing, the cavity wall of the inner cavity is provided with a stopper, and the housing of the drive motor is used to extend into the inner cavity and be engaged with the stopper along the horizontal direction;

[0013] The depth of the groove along the horizontal direction is greater than the depth of the stop relative to the fitting surface along the horizontal direction.

[0014] As a preferred technical solution for the gearbox housing, the air vent is arranged at the highest position of the housing in the vertical direction.

[0015] As a preferred technical solution for the gearbox housing, the angle between the axis of the through hole and the axis of the air vent is a preset value α, 20°<α<90°.

[0016] As a preferred technical solution for the gearbox housing, a groove wall of the annular groove is provided with a plurality of first reinforcing ribs at intervals around the circumference of the housing, and the plurality of first reinforcing ribs extend in the radial direction of the housing.

[0017] As a preferred technical solution for the gearbox housing, a plurality of second reinforcing ribs are arranged on the cavity wall of the inner cavity at intervals around the circumference of the shell, and the plurality of second reinforcing ribs extend in the radial direction of the shell.

[0018] As a preferred technical solution for the gearbox housing, the housing is an integrally formed part.

[0019] On the other hand, the utility model also provides a gearbox, including the gearbox housing described in the above scheme, wherein a gear set and oil are arranged in the housing, and the other side end surface of the housing along the horizontal direction is fixedly connected to the drive motor.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a gearbox housing and a gearbox, the gearbox housing includes a box body and a shell, the box body is provided with an opening; one side end face of the shell body along the horizontal direction is fixedly connected to the box body to close the opening, and a gear set and oil are arranged in the box body; the other side end face of the shell body along the horizontal direction is used to be fixedly connected to the drive motor and enclosed to form an inner cavity, the shell body is also provided with a through hole connecting the inner cavity and the opening, the rotating shaft of the drive motor is used to pass through the through hole and be connected to the gear set in a transmission manner, the shell body is provided with a breathable pipeline, the breathable pipeline connects the inner cavity with the external environment, and a respirator is arranged in the breathable pipeline. When the drive motor drives the gear set to work, the gear set will stir the oil in the box body, and in this process, the air pressure and oil pressure in the box body will increase. Since the inner cavity is connected to the opening through the through hole, and the inner cavity is connected to the external environment through the breathable pipeline, the high-pressure gas can enter the inner cavity along the through hole and then be discharged through the breathable pipeline. Since the air permeable pipeline is arranged in the inner cavity and the oil is located in the box, when the gear set stirs the oil, only a small part of the oil can enter the inner cavity. At the same time, the shell is also provided with an oil return port, which connects the inner cavity with the open port. The oil return port is located below the through hole, and the oil entering the inner cavity can be re-introduced into the box. This can effectively prevent the oil from entering the drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a gearbox housing in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the housing in the embodiment of the utility model;

[0024] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0025] Figure 4 for Figure 2 Cross-sectional view at the middle BB.

[0026] In the figure:

[0027] X, horizontal direction;

[0028] 100. Gear set;

[0029] 1. Box body;

[0030] 2. Shell; 21. Air vent; 211. Respirator; 22. Through hole; 23. Stopper; 24. Annular groove; 25. Inner cavity; 251. Through hole; 26. Fitting surface; 27. First reinforcing rib; 28. Second reinforcing rib; 29. ​​Oil return port. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the present invention can be understood according to specific circumstances.

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

[0035] like Figure 1 to Figure 4 As shown, the present embodiment provides a gearbox housing, which includes a case 1 and a shell 2, wherein the case 1 is provided with an opening; one side end face of the shell 2 along the horizontal direction X is fixedly connected to the case 1 to close the opening, and the case 1 is used to set a gear set 100 and oil; the other side end face of the shell 2 along the horizontal direction X is used to be fixedly connected to the drive motor and enclose an inner cavity 25, and the case 2 is also provided with a through hole 251 connecting the inner cavity 25 and the opening, and the rotating shaft of the drive motor is used to pass through the through hole 251 and be connected to the gear set 100 in a transmission manner, and the case 2 is provided with a breathable pipeline, which connects the inner cavity 25 with the external environment, and a respirator 211 is used to be set in the breathable pipeline. When the drive motor drives the gear set 100 to work, the gear set 100 will stir the oil in the case 1, and in this process, the air pressure and oil pressure in the case 1 both increase. Since the inner cavity 25 is connected to the open port through the through hole 251, and the inner cavity 25 is connected to the external environment through the air-permeable pipeline, the high-pressure gas can enter the inner cavity 25 along the through hole 251, and then be discharged through the air-permeable pipeline. Since the air-permeable pipeline is arranged in the inner cavity 25, the oil is located in the housing 1, and when the gear set 100 stirs the oil, only a small part of the oil can enter the inner cavity 25. At the same time, the housing 2 is also provided with an oil return port 29, which connects the inner cavity 25 and the open port. The oil return port 29 is located below the through hole 251, and the oil entering the inner cavity 25 can be re-introduced into the housing 1. This can effectively prevent the oil from entering the drive motor.

[0036] Specifically, the hole wall of the through hole 251 has an interference fit with the outer ring of the bearing, the rotating shaft of the driving motor is passed through the inner ring of the bearing and has an interference fit with the inner ring, and the bearing is coated with lubricating grease. Therefore, the above arrangement can prevent part of the oil from entering the inner cavity 25 from the housing 1.

[0037] As for the specific structure of the air vent, optionally, the inner cavity 25 is located in the shell 2, and the shell 2 is also provided with an annular fitting surface 26 located on the outer periphery of the inner cavity 25, and an annular groove 24 is concavely provided on the fitting surface 26 around its circumference, and the shell 2 is provided with an air vent 21 connecting the annular groove 24 and the external environment, and the shell 2 is provided with a through hole 22 connecting the annular groove 24 and the inner cavity 25, and the axis of the through hole 22 is set at an angle to the axis of the air vent 21, and the fixing ring of the driving motor is used to fit with the fitting surface 26 and be fixedly connected to the shell 2, and the groove wall of the annular groove 24 is used to be surrounded by the fixing ring to form an annular tube, the air vent 21, the annular tube and the through hole 22 are connected in sequence and constitute an air vent, and the air vent 21 is used to set a respirator 211. In this embodiment, the high-pressure gas in the inner cavity 25 carries a small amount of high-pressure oil vapor gaseous mixture into the annular tube through the through hole 22. During the diffusion of the gaseous mixture in the annular tube, part of the gaseous oil will be liquefied and attached to the annular tube wall. Then, the gaseous mixture will enter the air vent 21. Since the air vent 21 is provided with a respirator 211, the gaseous mixture is discharged through the respirator 211. The axis of the through hole 22 is arranged at an angle to the axis of the air vent 21, which can prevent the gaseous mixture in the inner cavity 25 from directly entering the air vent 21 without sufficient gas-liquid separation after entering the annular tube through the through hole 22.

[0038] In other embodiments, the annular groove 24 may also be provided on the fixing ring of the driving motor.

[0039] Specifically, the function of the respirator 211 is to maintain the gas pressure balance inside the gearbox, dissipate heat, prevent water and dust, and improve the quality of intake and exhaust air.

[0040] Optionally, along the horizontal direction X, the sleeve surface 26 is provided with a groove, and the groove wall of the groove is used to surround the fixing ring to form a through hole 22. In this embodiment, the through hole 22 is formed by the groove and the fixing ring, and this arrangement facilitates cleaning of the groove. In other embodiments, the through hole 22 can also be directly formed on the housing 2, such as by drilling cuttings or reserving the through hole 22 during casting.

[0041] Optionally, the cavity wall of the inner cavity 25 is provided with a stopper 23, and the housing of the driving motor is used to extend into the inner cavity 25 and engage with the stopper 23 along the horizontal direction X; the depth of the groove along the horizontal direction X is greater than the depth of the stopper 23 relative to the fitting surface 26 along the horizontal direction X. In this embodiment, when the driving motor is inserted into the inner cavity 25, the housing of the driving motor abuts against the cavity wall of the inner cavity 25, and at this time, the housing of the driving motor will play a role in blocking the groove. In order to prevent the housing of the driving motor from completely blocking the groove, the depth of the groove along the horizontal direction X is further made greater than the depth of the stopper 23 relative to the fitting surface 26 along the horizontal direction X, so as to ensure that when the driving motor abuts against the stopper 23 along the horizontal direction X, the inner cavity 25 can still be connected to the annular tube through the through hole 22.

[0042] Optionally, the air hole 21 is arranged at the highest position in the vertical direction of the housing 2. In this embodiment, after the gaseous mixture enters the annular tube, the gas continues to rise, and the oil is liquefied as the temperature decreases, and the liquefied oil gradually drops. Therefore, the air hole 21 is arranged at the highest position in the vertical direction of the housing 2, which can more fully achieve the separation of gas and liquid.

[0043] Preferably, the angle between the axis of the through hole 22 and the axis of the vent hole 21 is a preset value α, 20°<α<90°, and in other embodiments, 90°≤α≤180°.

[0044] Optionally, the groove wall of the annular groove 24 is provided with a plurality of first reinforcing ribs 27 at intervals around the circumference of the housing 2, and the plurality of first reinforcing ribs 27 extend radially of the housing 2. In this embodiment, this arrangement can enhance the strength of the position where the annular groove 24 is located on the fitting surface 26, thereby improving the overall strength of the housing 2.

[0045] Optionally, a plurality of second reinforcing ribs 28 are arranged on the cavity wall of the inner cavity 25 at intervals around the circumference of the shell 2, and the plurality of second reinforcing ribs 28 extend in the radial direction of the shell 2. In this embodiment, this arrangement can enhance the strength of the shell 2 at the position of the inner cavity 25.

[0046] Optionally, the housing 2 is an integrally formed part. In this embodiment, the above arrangement can improve the manufacturing accuracy and overall strength of the housing 2, improve the production efficiency of the housing 2, and reduce the production cost. Specifically, the housing 2 can be made by a casting process or an additive manufacturing process.

[0047] This embodiment also provides a gearbox, including the gearbox housing in the above solution, wherein a gear set 100 and oil are arranged in the housing 1, and the housing 2 is fixedly connected to the drive motor on the other side end surface along the horizontal direction X.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A gearbox housing, characterized in that: include: A box body (1), wherein the box body (1) is provided with an opening; A housing (2), wherein one end surface of the housing (2) along the horizontal direction (X) is fixedly connected to the box body (1) to close the opening, and the box body (1) is used to arrange a gear set (100) and oil; the other end surface of the housing (2) along the horizontal direction (X) is used to be fixedly connected to the drive motor and to enclose an inner cavity (25), and the housing (2) is also provided with a through hole (251) connecting the inner cavity (25) and the opening, and the rotating shaft of the drive motor is used to The housing (2) is provided with a ventilation pipeline, which connects the inner cavity (25) with the external environment, and a respirator (211) is arranged in the ventilation pipeline. The housing (2) is also provided with an oil return port (29), which connects the inner cavity (25) with the open port, and the oil return port (29) is located below the through hole (251).

2. The gearbox housing according to claim 1, characterized in that: The inner cavity (25) is located in the shell (2). The shell (2) is also provided with an annular fitting surface (26) located on the outer periphery of the inner cavity (25). An annular groove (24) is concavely provided on the fitting surface (26) around its circumference. The shell (2) is provided with an air vent (21) connecting the annular groove (24) and the external environment. The shell (2) is provided with a through hole (22) connecting the annular groove (24) and the inner cavity (25). The axis of the through hole (22) is arranged at an angle with the axis of the air vent (21). The fixing ring of the drive motor is used to fit with the fitting surface (26) and be fixedly connected to the shell (2). The groove wall of the annular groove (24) is used to surround the fixing ring to form an annular tube. The air vent (21), the annular tube and the through hole (22) are connected in sequence and constitute the air vent pipeline. The air vent (21) is used to set a respirator (211).

3. The gearbox housing according to claim 2, characterized in that: Along the horizontal direction (X), the fitting surface (26) is provided with a groove, and the groove wall of the groove is used to surround the fixing ring to form the through hole (22).

4. The gearbox housing according to claim 3, characterized in that: The cavity wall of the inner cavity (25) is provided with a stopper (23), and the housing of the drive motor is used to extend into the inner cavity (25) and be engaged with the stopper (23) along the horizontal direction (X); The depth of the groove along the horizontal direction (X) is greater than the depth of the stop (23) relative to the fitting surface (26) along the horizontal direction (X).

5. The gearbox housing according to claim 2, characterized in that: The vent hole (21) is arranged at the highest position of the shell (2) in the vertical direction.

6. The gearbox housing according to claim 5, characterized in that: The angle between the axis of the through hole (22) and the axis of the vent hole (21) is a preset value α, 20°<α<90°.

7. The gearbox housing according to any one of claims 2 to 6, characterized in that: The groove wall of the annular groove (24) is provided with a plurality of first reinforcing ribs (27) at intervals around the circumference of the shell (2), and the plurality of first reinforcing ribs (27) extend in the radial direction of the shell (2).

8. The gearbox housing according to any one of claims 1 to 6, characterized in that: A plurality of second reinforcing ribs (28) are arranged on the cavity wall of the inner cavity (25) at intervals around the circumference of the shell (2), and the plurality of second reinforcing ribs (28) extend in the radial direction of the shell (2).

9. The gearbox housing according to any one of claims 1 to 6, characterized in that: The housing (2) is an integrally formed part.

10. A gearbox, characterized in that: It comprises a gearbox housing as claimed in any one of claims 1 to 9, wherein a gear set (100) and oil are arranged in the housing, and the housing (2) is fixedly connected to the drive motor at the other end surface along the horizontal direction (X).

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