Respirator structure of new energy gearbox

Abstract

The utility model discloses a respirator structure of a new energy gearbox. The respirator structure comprises a box body of the new energy gearbox. The respirator body is arranged at the outer port of the bent pipe and is used for filtering dust in the air sucked by the oil tank; the bent pipe is arranged on the side wall of the box body, communicates with the interior of the box body and is used for communicating the box body with the respirator body; a transition sleeve is arranged between the bent pipe and the air hole of the box body; an anti-splashing special-shaped pipe structure and an air pressure balance hole structure with balanced air pressure are additionally arranged, splashing oil in the gearbox is blocked for multiple times, little oil enters the respirator, and therefore it is guaranteed that the respirator cannot leak oil, and the problems that when the oil level is high and the output rotating speed is high, the oil quantity of the splashing oil is large, and oil leakage is caused are solved. The problem that oil enters the respirator body to cause oil leakage is solved, the phenomena of running, overflowing, dripping and leaking of the oil of the gearbox are reduced, and the reputation and the market competitiveness of the product are improved.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, specifically, it relates to a breather structure for a new energy gearbox. Background Technology

[0002] In conventional mobile machinery, the gearbox housing typically doubles as the oil tank. Because the gearbox requires cooling, the oil pump draws oil from the housing, passes it through the lubrication valve and oil cooler, and then returns it to the housing. During gearbox operation, the temperature rises, causing internal gases to expand. Therefore, these internal gases must be released through the venting system to prevent excessive pressure inside the gearbox, which could lead to oil seal leaks. Figure 2 As shown, this type of gearbox has an open structure and is usually equipped with an external breather to filter out a large amount of dust in the environment and ensure that the air entering the gearbox is clean.

[0003] Meanwhile, due to significant tilting or bumps encountered during vehicle operation, the oil level in the transmission fluctuates. When the oil temperature rises, the air inside the transmission expands, and the oil splashes onto the lower part of the breather due to the high-speed rotation of the gears, increasing the internal pressure of the transmission. If the internal air pressure is higher than the external atmospheric pressure, a large amount of splashed oil may enter the breather and be propelled out along the breather wall, resulting in oil leakage. Oil leakage is closely related to the oil level; it is more likely to occur when the oil level is high, especially when the oil level gauge is at its highest point.

[0004] At the standard oil level (middle position on the oil level gauge), conventional transmissions generally do not experience oil leakage issues. However, in new energy transmissions, although the breather does not leak oil at low speeds, oil leakage often occurs when the motor speed is high (above 3000 rpm). This situation is unacceptable to customers and is also unreasonable from a design perspective.

[0005] Therefore, there are usually three main reasons why a respirator leaks oil:

[0006] Oil level too high: When the oil level is close to the highest mark of the oil level gauge, the amount of oil agitated by the output gear increases. Once the oil temperature rises to 90-100℃, oil leakage is likely to occur.

[0007] Poorly positioned breather: When the breather is installed within the spray angle of the gear splash, the splashed oil directly impacts the breather. Especially when the oil temperature rises and the internal air pressure of the gearbox is greater than the external atmospheric pressure, the breather is more prone to oil leakage problems.

[0008] High-speed operation: When the output gear speed is high (especially exceeding 3000 rpm), the oil churning effect intensifies, oil splashes and bubbles are generated, and the thermal expansion of the gas causes the internal pressure to rise. Under these conditions, the breather is very prone to oil leakage, especially when the oil temperature exceeds the normal operating temperature (80-90℃).

[0009] The root cause of oil leakage is that the amount of oil entering the respirator exceeds the amount of oil exiting. As the oil inlet of the respirator becomes covered with oil, an internal pressure difference is created. When this pressure difference exceeds the weight of the oil, the oil is ejected from the respirator, causing oil leakage.

[0010] Currently, the conventional solution is to block the oil inlet of the breather to reduce the amount of oil entering the breather. While this method can alleviate the problem to some extent, in new energy vehicle transmissions, where motor speeds generally exceed 3000 rpm, blocking the breather can still lead to oil leakage at high speeds, thus having certain limitations. Utility Model Content

[0011] To address the technical problem in existing technologies where new energy transmissions still leak oil during high-speed operation, this invention provides a breather structure for a new energy transmission.

[0012] The objective of this utility model can be achieved through the following technical solutions:

[0013] A breather structure for a new energy transmission includes a transmission housing; a breather body disposed at the outer end of a bend for filtering dust from the air drawn in by the fuel tank; a bend disposed on the side wall of the housing and communicating with the interior of the housing for connecting the housing and the breather body; a transition sleeve disposed between the bend and the air vent of the housing; a connector disposed inside the transition sleeve; and a shaped tube disposed at the end of the connector away from the breather body.

[0014] Furthermore, the transition sleeve has a T-shaped cross-section; the inner surface of the transition sleeve corresponding to the position of the air hole on the box body is provided with internal threads, and the outer surface is provided with external threads.

[0015] Furthermore, the lower end of the bend is fixedly connected to a first joint; the transition sleeve is connected to the housing via an external thread.

[0016] Furthermore, an O-ring rubber ring is provided on the side of the transition sleeve near the outer wall of the housing.

[0017] Furthermore, the connector has a hollow internal structure, a hexagonal structure at the end furthest from the transition sleeve, and a circular structure at the end closest to the transition sleeve.

[0018] Furthermore, the outer diameter of one end of the circular structure on the connector head is the same as the inner diameter of the transition sleeve; the outer diameter of one end of the circular structure on the connector head is larger than the width of one end of the regular hexagon on the connector head.

[0019] Furthermore, the outer surface of the connector near the transition sleeve is provided with a connecting thread.

[0020] Furthermore, one or more mesh plates are fixedly installed inside the connector.

[0021] Furthermore, a gap is provided between the end of the connector located inside the transition sleeve and the transition sleeve; an air pressure balance hole is opened at one end of the connector corresponding to the circular structure.

[0022] Furthermore, a second connector is fixedly connected to one end of the upper part of the irregular tube near the connector head;

[0023] The cross-section of the irregular tube is R-shaped, and the lower part is a right-angled structure with a gradually expanding opening, with the inclined surface of the right-angled structure located on the side close to the connector.

[0024] The upper part of the irregular tube is provided with a return hole, which is located above the inclined surface of the right-angle structure on the irregular tube.

[0025] The beneficial effects of this utility model are:

[0026] 1) Based on the existing breather, this utility model adds a splash-proof irregular tube structure and a pressure-balancing hole structure to balance the air pressure. This allows it to block splashed oil from inside the gearbox multiple times, resulting in very little oil entering the breather. This ensures that the breather will not leak oil, solving the problem of oil leakage caused by a large amount of splashed oil when the oil level and output speed are high. This reduces the leakage of gearbox oil, improving the product's reputation and market competitiveness. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional schematic diagram of the assembly of the housing and the respirator body in this utility model;

[0029] Figure 2 This is a cross-sectional schematic diagram of the assembly of the housing and the respirator body in the prior art;

[0030] Figure 3 This is a schematic diagram of the bent pipe structure in this utility model;

[0031] Figure 4 This is a schematic diagram of the transition sleeve in this utility model;

[0032] Figure 5This is a schematic diagram of the connector structure in this utility model;

[0033] Figure 6 This is a schematic diagram of the irregularly shaped tube in this utility model;

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Housing; 2. Bend; 201. Breather body; 202. First connector; 3. Transition sleeve; 301. External thread; 302. Internal thread; 303. Rubber ring; 4. Connector; 401. Connecting thread; 402. Air pressure balance hole; 403. Mesh plate; 5. Shaped tube; 501. Second connector; 502. Return hole. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figure 1 and Figure 3 As shown, a breather structure for a new energy transmission includes a housing 1 of the new energy transmission, with air holes provided on the side wall of the housing 1; a bent pipe 2 is connected to the side wall of the housing 1, the bent pipe 2 is L-shaped and the outer port is facing upward; a breather body 201 is fixedly connected to the outer port of the bent pipe 2, the breather body 201 is used to filter out dust in the air drawn into the fuel tank, and the pre-pressure is 0.07MPa.

[0038] Please refer to it again. Figure 1 Figure 4 As shown, a transition sleeve 3 is provided between the bend 2 and the air hole of the box 1. The cross-section of the transition sleeve 3 is T-shaped. The inner surface of the transition sleeve 3 corresponding to the position of the air hole on the box 1 is provided with an internal thread 302, and the outer surface is provided with an external thread 301.

[0039] Please refer to it again. Figure 3 As shown, the lower end of the bend 2 is fixedly connected to the first connector 202, and the bend 2 is connected to the transition sleeve 3 through the first connector 202.

[0040] Please refer to it again. Figure 4 As shown, the transition sleeve 3 is connected to the housing 1 via an external thread 301; an O-ring rubber ring 303 is provided on the side of the transition sleeve 3 near the outer wall of the housing 1, which is used to increase the airtightness between the transition sleeve 3 and the housing 1.

[0041] Please refer to it again. Figure 1 and Figure 5 As shown, a connector 4 is provided inside the transition sleeve 3. The connector 4 has a hollow structure inside, with the end away from the transition sleeve 3 having a regular hexagonal structure and the end closer to the transition sleeve 3 having a circular structure. The outer diameter of the circular structure is the same as the inner diameter of the transition sleeve 3, and the outer diameter of the circular structure is larger than the width of the hexagonal end. A connecting thread 401 is provided on the outer surface of the end of the connector 4 close to the transition sleeve 3, and the connector 4 is fixedly connected to the transition sleeve 3 through the connecting thread 401.

[0042] One or more mesh plates 403 (in this embodiment, they are circular) are fixedly installed inside the connector 4. The mesh plates 403 are used to block some of the oil from being sprayed out.

[0043] Please refer to it again. Figure 1 and Figure 5 As shown, there is a gap between the end of the connector 4 located inside the transition sleeve 3 and the transition sleeve 3, and the gap is 3mm-10mm; the connector 4 has an air pressure balance hole 402 at one end corresponding to the circular structure, and the air pressure balance hole 402 is connected to the gap formed between the connector 4 and the transition sleeve 3.

[0044] Please refer to it again. Figure 1 and Figure 6 As shown, the connector 4 is provided with a special-shaped tube 5 at one end corresponding to the regular hexagonal structure. The cross-section of the special-shaped tube 5 is R-shaped, and the lower part is a right-angle structure with a gradually expanding opening. The inclined surface is located on the side close to the connector 4 to prevent splashed oil from entering the inlet of the respirator body 201. A return hole 502 is opened on the upper part of the special-shaped tube 5. The return hole 502 is located above the inclined surface of the special-shaped tube 5.

[0045] A second connector 501 is fixedly connected to one end of the upper part of the shaped tube 5 near the connector 4, and the shaped tube 5 is connected to the connector 4 through the second connector 501.

[0046] To facilitate understanding of the above-mentioned technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below:

[0047] When the oil temperature inside the transmission housing 1 rises until it exceeds the normal operating temperature, oil vapor is gradually generated, causing the internal air pressure of the transmission to gradually increase, while the external atmospheric pressure of the transmission is lower than the internal air pressure.

[0048] First, because the housing 1 is connected to the irregular tube 5, and the lower part of the irregular tube 5 has a gradually expanding opening structure, the oil inside the gearbox can only enter the irregular tube 5 from the bottom. The oil from the side is blocked, preventing some of the oil from spraying out.

[0049] Secondly, since the lower part of the irregular tube 5 has a gradually expanding structure, the upper aperture is smaller and the lower aperture is larger. The inclined surface can be used to further block some of the oil from below, thus preventing some of the oil from spraying out.

[0050] Finally, since the upper part of the shaped tube 5 has a return hole 502, even if a large amount of splashed oil enters the interior of the shaped tube 5, the return hole 502 can allow the oil that has entered the interior of the shaped tube 5 to fall back into the interior of the gearbox housing 1, thus preventing the oil from spraying out again.

[0051] It is worth noting here that: First, since the return hole 502 is located above the inclined surface of the shaped tube 5, the oil inside the transmission is directly blocked, preventing the oil from splashing directly from the return hole 502 into the shaped tube 5; Second, since the return hole 502 is connected to the inside of the transmission, the air pressure inside the shaped tube can be kept consistent with and balanced with the air pressure inside the transmission.

[0052] When oil passes through the pores on the mesh plate 403, an oil film structure is automatically formed, making it difficult for oil entering the connector 4 to enter the inlet of the respirator body 201.

[0053] By providing a pressure balance hole 402 on the connector 4 and setting a gap between the connector 4 and the transition sleeve 3 to connect them, the air pressure inside the shaped tube 5 and the air pressure inside the gearbox housing 1 are kept consistent and balanced. Therefore, even if oil enters the shaped tube 5, it can flow back into the gearbox through the return hole 502 by gravity.

[0054] This invention, based on the existing breather, adds a splash-proof irregular-shaped tube 5 structure and a pressure-balancing hole 402 structure for air pressure balance. These structures repeatedly block splashing oil from inside the transmission, minimizing oil entry into the breather and preventing oil leakage. This solves the problem of oil leakage caused by a large amount of splashing oil entering the breather body 201 when the oil level and output speed are high. It reduces transmission oil leakage and improves the product's reputation and market competitiveness.

[0055] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A breather structure for a new energy transmission, comprising: The housing of a new energy transmission (1); The respirator body (201) is located at the outer port of the bend (2) and is used to filter dust in the air drawn in from the fuel tank. A bend (2) is installed on the side wall of the box (1) and communicates with the inside of the box (1) to connect the box (1) and the respirator body (201); Its features are: A transition sleeve (3) is provided between the bend (2) and the air hole of the box (1); a connector (4) is provided inside the transition sleeve (3); a shaped tube (5) is provided at the end of the connector (4) away from the respirator body (201).

2. The breather structure of a new energy transmission according to claim 1, characterized in that: The cross-section of the transition sleeve (3) is T-shaped; the inner surface of the transition sleeve (3) corresponding to the position of the air hole on the box (1) is provided with an internal thread (302), and the outer surface is provided with an external thread (301).

3. The breather structure of a new energy transmission according to claim 2, characterized in that: The lower end of the bend (2) is fixedly connected to the first connector (202); the transition sleeve (3) is connected to the box (1) through the external thread (301).

4. The breather structure of a new energy transmission according to claim 1, characterized in that: The transition sleeve (3) is provided with an O-shaped rubber ring (303) on the side near the outer wall of the box (1).

5. The breather structure of a new energy transmission according to claim 1, characterized in that: The connector (4) has a hollow structure inside, a regular hexagonal structure at the end away from the transition sleeve (3), and a circular structure at the end close to the transition sleeve (3).

6. The breather structure of a new energy transmission according to claim 5, characterized in that: The outer diameter of one end of the circular structure on the connector (4) is the same as the inner diameter of the transition sleeve (3); the outer diameter of one end of the circular structure on the connector (4) is greater than the width of one end of the regular hexagon on the connector (4).

7. The breather structure of a new energy transmission according to claim 6, characterized in that: The outer surface of the connector (4) near the transition sleeve (3) is provided with a connecting thread (401).

8. The breather structure of a new energy transmission according to claim 1, characterized in that: One or more mesh plates (403) are fixedly installed inside the connector (4).

9. The breather structure of a new energy transmission according to claim 5, characterized in that: The connector (4) is located inside the transition sleeve (3) with a gap between the end of the connector (4) and the transition sleeve (3); the connector (4) is provided with a pressure balance hole (402) at one end corresponding to the circular structure.

10. The breather structure of a new energy transmission according to claim 5, characterized in that: The upper part of the shaped tube (5) near the connector (4) is fixedly connected to a second connector (501); The cross-section of the irregular tube (5) is an R-shaped structure, and the lower part is a right-angle structure with a gradually expanding opening, and the inclined surface of the right-angle structure is located on the side close to the connector (4). The upper part of the irregular tube (5) is provided with a return hole (502), which is located above the inclined surface of the right-angle structure on the irregular tube (5).

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