Oil-gas separation labyrinth structure of speed reducer

Abstract

The utility model discloses an oil-gas separation labyrinth structure of a speed reducer, which comprises a concave cavity which is arranged on the side wall of the upper part in a front shell of the speed reducer and is concaved outwards to serve as a labyrinth uterine cavity, the concave cavity forms a protruding part outside the front shell, the top of the protruding part is provided with an air hole for the concave cavity to be communicated with the outside, and a ventilation cap is arranged on the air hole. The oil-gas separation labyrinth structure further comprises a shielding plate which is fixed to an opening of the concave cavity in the front shell and used for preventing splashing lubricating oil from being directly splashed into the concave cavity, and the lower side of the shielding plate is provided with an oil-gas channel which is communicated with the concave cavity and an inner cavity of the speed reducer, wherein the bottom face of the oil-gas channel is an inclined face. The device has the advantages that the space in the reducer box is not occupied; the direct impact of high-speed dense splashing lubricating oil in the speed reducer box can be completely avoided, so that the concave cavity serving as the labyrinth forms a space capable of enabling oil gas to move upwards relatively quietly; and the space which possibly interferes with the installation of other parts outside the speed reducer shell is not occupied.

Description

Technical Field

[0001] This utility model relates to an oil-gas separation labyrinth structure for a speed reducer, belonging to the technical field of speed reduction equipment. Background Technology

[0002] New energy vehicles are powered by an electric motor that drives a reducer to rotate. The reducer then connects to the wheels via a half-shaft to provide power to the vehicle.

[0003] The high-speed meshing of gears within the reducer causes a rapid rise in internal temperature, increasing the air pressure inside the reducer housing. To prevent lubricating oil from penetrating the oil seals under high pressure, a venting device must be installed on the top wall of the reducer to balance the internal air pressure. Since the reducer housing contains a large amount of splashed lubricating oil stirred up from the lubricating oil at the bottom of the reducer by the main reduction gear, a labyrinth-like structure is installed at the top of the reducer housing to separate oil and gas, preventing the splashed oil droplets from being ejected through the venting device.

[0004] The input end of the new energy reducer is connected to the motor. In the past decade or so, in order to improve motor efficiency, motors have developed towards higher speeds, resulting in increased gear speeds within the reducer's internal cavity. This causes the lubricating oil at the bottom of the reducer cavity to splash at high speed and density. At the same time, compared to traditional gearboxes, the new energy reducer has a more compact structure. If the labyrinth were placed at the top of the reducer housing as before, it would inevitably increase the total space inside the reducer housing, leading to a larger reducer size, which contradicts the development requirements of miniaturization and lightweight reduction equipment. Furthermore, placing the separation labyrinth directly within the reducer housing space with high-speed, dense splashing lubricating oil would inevitably reduce the oil-gas separation effect, because the oil-gas separation labyrinth, being close to the high-speed, dense splashing lubricating oil, would find it more difficult to achieve complete oil-gas separation within a limited space and stroke. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to separate the high-speed, dense splashing lubricating oil in the limited space inside the reducer gearbox.

[0006] To address the above problems, the technical solution proposed by this utility model is as follows:

[0007] A labyrinth structure for oil-gas separation in a speed reducer includes a recessed cavity on the upper side wall of the front housing of the speed reducer, which serves as the labyrinth cavity. The recessed cavity forms a protrusion on the outer side of the front housing. An air hole communicating between the recessed cavity and the outside is provided at the top of the protrusion. A vent cap is provided on the air hole.

[0008] The oil-gas separation labyrinth structure also includes a shielding plate fixed to the opening of the concave cavity in the front housing to prevent splashing lubricating oil from directly splashing into the concave cavity. The lower side of the shielding plate is provided with an oil-gas channel with a sloping bottom surface that connects the concave cavity and the inner cavity of the reducer.

[0009] A baffle is provided in the upper cavity of the oil and gas passage, extending from the left side wall of the cavity to the right side, and there is an oil and gas gap between the baffle and the right side wall of the cavity.

[0010] Above the first baffle, there is a second baffle extending from the right side wall of the concave cavity to the left and downward, and there is an oil-gas gap two between the second baffle and the left side wall of the concave cavity.

[0011] An oil-blocking protrusion facing to the right is provided on the left side wall of the cavity above the second baffle.

[0012] The shielding plate has screw through holes at its edge and corresponding threaded screw holes on the front housing at the edge of the cavity. The shielding plate is fixed by screws.

[0013] The recessed direction of the cavity is towards the motor mounting position of the front housing, and its protrusion is located in the gap between the front housing and the mounted motor. Beneficial effects

[0014] 1. It does not occupy space inside the gearbox;

[0015] 2. It can completely avoid the direct impact of high-speed and dense splashing lubricating oil in the reducer box, so that the concave cavity, which is like a labyrinth, forms a space that allows oil and gas to move upward relatively quietly.

[0016] 3. It does not occupy the space outside the reducer housing that may interfere with the installation of other components. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the inner side of the front housing of the transmission;

[0018] Figure 2 This is a three-dimensional schematic diagram of the motor end connected to the outer side of the front housing of the transmission, showing the air vents on the protrusion;

[0019] Figure 3 This is a three-dimensional schematic diagram of the motor end connected to the outer side of the front housing of the transmission, showing the vent cap at the location of the air hole on the protrusion;

[0020] Figure 4 for Figure 1 A partial schematic diagram, showing the cavity;

[0021] Figure 5 for Figure 1 A partial schematic diagram, showing the shielding plate covering the cavity opening.

[0022] In the diagram: 1. Cavity; 2. Protrusion; 201. Air hole; 202. Vent cap; 3. Shielding plate; 4. Oil and gas passage; 401. Bottom surface; 5. Baffle one; 501. Oil and gas gap one; 6. Baffle two; 601. Oil and gas gap two; 7. Oil-blocking protrusion; 8. Threaded screw hole; 9. Screw; 10. Front housing; 11. Inside the reducer box. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figure 1 As shown in Figure 3, a labyrinth structure for oil-gas separation in a speed reducer includes a recessed cavity 1 on the upper sidewall of the front housing 10 of the speed reducer, which serves as the labyrinth cavity. A protrusion 2 is formed on the outer side of the front housing 1. An air vent 201 communicating with the outside is provided at the top of the protrusion 2, and a vent cap 202 is provided on the air vent 201. In this way, the labyrinth, originally located inside the speed reducer housing 11, is effectively moved outside the speed reducer housing, eliminating the need to occupy the cavity inside the speed reducer housing 11. Simultaneously, it is kept away from the high-speed, dense splashing lubricating oil inside the speed reducer housing 11, which facilitates the separation of lubricating oil and gas in the oil-gas mixture (a mixture of lubricating oil and air) entering the recessed cavity 1.

[0025] Furthermore, the oil-gas separation labyrinth structure also includes a shielding plate 3 fixed to the opening of the inner cavity 1 of the front housing to prevent splashed lubricating oil from directly splashing into the cavity 1. The lower side of the shielding plate 3 is provided with an oil-gas channel 4 with a sloping bottom surface 401 connecting the cavity 1 and the inner cavity of the reducer. In this way, the high-speed, densely splashed lubricating oil in the reducer housing 11 cannot directly enter the cavity 1, which serves as a labyrinth, while the gas in the transmission housing containing tiny droplets of splashed lubricating oil can enter the cavity 1 through the oil-gas channel 4. The lubricating oil separated from the oil-gas can then flow back into the reducer housing 11 along the sloping bottom surface 401 of the oil-gas channel.

[0026] A baffle 5 extending from the left side wall of the cavity 1 to the right is provided in the upper cavity 1 of the oil-gas passage 4, with an oil-gas gap 501 between the baffle 5 and the right side wall of the cavity 1. Above the baffle 5, a baffle 6 extending from the right side wall of the cavity 1 to the left and downward is provided, with an oil-gas gap 601 between the baffle 6 and the left side wall of the cavity 1. An oil-blocking protrusion 7 extending to the right is provided on the left side wall of the cavity 1 above the baffle 6. The baffle 5, the baffle 6, and the oil-blocking protrusion 7 are designed to allow the oil and gas entering the cavity 1 from the oil-gas passage 4 to have a longer and more tortuous travel path within the cavity 1, enabling it to come into more contact with various solid surfaces within the cavity 1, allowing the lubricating oil droplets contained in the gas to condense on the solid surfaces, thereby achieving the effect of oil-gas separation.

[0027] The shielding plate 3 has screw through holes at its edge, and the front housing at the edge of the cavity 1 has corresponding threaded screw holes 8. The shielding plate 3 is fixed by screws 9.

[0028] Preferably, the recessed direction of the cavity 1 is towards the direction of the front housing 10 toward the motor mounting position, and its protrusion 2 is located in the gap between the front housing 10 and the mounted motor. In this way, even if the oil-gas separation labyrinth structure is located outside the reducer housing, it will not occupy space that might interfere with the setting of other mechanisms.

[0029] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. An oil and gas separation labyrinth structure of a retarder, characterized by: The invention relates to a labyrinth cavity (1) which is recessed on the upper side wall of the front housing (10) of a speed reducer and is used as a labyrinth cavity, the labyrinth cavity (1) forms a protrusion (2) on the outer side of the front housing, a gas hole (201) is arranged on the top of the protrusion (2) to connect the labyrinth cavity (1) with the outside, and a gas permeable cap (202) is arranged on the gas hole (201).

2. The oil and gas separation labyrinth structure of a speed reducer according to claim 1, characterized by: A shielding plate (3) is arranged in the mouth of the labyrinth cavity (1) in the front housing to prevent the splashed lubricating oil from directly splashing into the labyrinth cavity (1), the lower side of the shielding plate (3) is provided with an oil-gas passage (4) which has an inclined bottom surface and connects the labyrinth cavity (1) with the inner cavity of the speed reducer.

3. The oil and gas separation labyrinth structure of a speed reducer according to claim 2, characterized by: A baffle plate one (5) is arranged in the upper part of the oil-gas passage (4) and in the labyrinth cavity (1), the baffle plate one (5) extends from the left side wall of the labyrinth cavity (1) to the right side, and the baffle plate one (5) and the right side wall of the labyrinth cavity (1) have an oil-gas gap one (501).

4. The oil and gas separation labyrinth structure of a speed reducer according to claim 3, characterized by: A baffle plate two (6) is arranged above the baffle plate one (5) and extends from the right side wall of the labyrinth cavity (1) to the left and downward, and the baffle plate two (6) and the left side wall of the labyrinth cavity (1) have an oil-gas gap two (601).

5. The oil and gas separation labyrinth structure of a speed reducer according to claim 4, characterized by: An oil blocking protrusion (7) is arranged on the left side wall of the labyrinth cavity (1) above the baffle plate two (6) and extends to the right side.

6. The oil and gas separation labyrinth structure of a speed reducer according to claim 2, characterized by: Screw through holes are arranged on the edge of the shielding plate (3), corresponding screw holes (8) are arranged on the front housing at the edge of the labyrinth cavity (1), and the shielding plate (3) is fixed by screws (9).

7. The oil-gas separation labyrinth structure of a speed reducer according to any one of claims 1 to 5, characterized by: The recess direction of the labyrinth cavity (1) is the direction of the front housing (10) towards the motor mounting position, and the protrusion (2) is located in the gap between the front housing (10) and the mounted motor.

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