A sealing structure of a gearbox oil passage

Abstract

The utility model discloses a sealing structure of gearbox oil circuit, including flow path casing, filter part, filter part respectively with inlet and backflow hole intercommunication, and the backflow passage intercommunication between filter part and backflow hole, the backflow passage is the broken line type, and sets up the sealing hole in the position of broken line elbow, the inner end of sealing plug body and the inner wall of sealing hole form transition elbow jointly, and set up at least one sealing gap on filter part, and the application utilizes hole hoop and double -deck retreat platform structure to reduce the manufacturing precision requirement, and provides deformation allowance in the welding, reduces stress concentration, prolongs life, and through setting up sealing gap, makes the condition of leaky packing ring can be effectively detected, improves detection reliability.

Description

Technical Field

[0001] This utility model relates to the field of transmission sealing structure technology, specifically a sealing structure for transmission oil circuit. Background Technology

[0002] In automotive transmission systems, the gearbox, as the core component for power transmission and gear shifting, relies on the stable operation of the oil circuit system for its internal lubrication and cooling. During long-term operation, the oil circuit needs to maintain good sealing to ensure that the lubricating oil circulates along the designated path, preventing problems such as leakage, seepage, or abnormal pressure.

[0003] Common sealing structures typically include a flow path housing, an oil filter assembly, and corresponding sealing rings and plugs. However, as modern automobiles increasingly demand higher transmission efficiency, lighter weight, and greater durability, traditional sealing structures are gradually revealing some insurmountable shortcomings.

[0004] First, there are shortcomings in sealing inspection. Existing sealing designs mostly rely on the compression effect between static sealing rings or plugs and the bore wall to maintain a sealing state. However, in actual use, some parts can maintain a seal even at low pressure, even if the sealing ring is missing, which is difficult to detect in general factory inspections.

[0005] Secondly, regarding the welding process, when ultrasonic welding is applied to gearbox oil circuit sealing, due to the differences in material properties and geometry between the oil circuit housing and the sealing plug, uneven weld bonding, insufficient weld depth, or stress concentration are prone to occur during ultrasonic welding. This not only reduces the strength of the welded area but may also cause cracks under long-term vibration and thermal cycling, leading to seal failure.

[0006] Furthermore, while the interference fit between the traditional sealing plug and the bore wall provides a certain degree of sealing, if the structure fails to properly release stress during stress and assembly, it is highly susceptible to localized deformation or material fatigue. Over prolonged operation, these potential problems accumulate and amplify, further weakening the sealing effect and reducing service life. Therefore, we propose a sealing structure for the transmission oil circuit. Utility Model Content

[0007] The purpose of this invention is to provide a sealing structure for the transmission oil circuit to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for a transmission oil circuit, comprising a flow path housing and a filter section. The filter section is connected to an inlet and a return hole, respectively. The filter section includes a filter housing and a filter element, which is basically the same basic arrangement as the existing technology. The return hole is located away from the filter section, and the filter section and the return hole are connected through a return flow path, thereby reducing the impact of pressure changes in the filter section on other internal flow paths. The return flow path is zigzag-shaped to make full use of the space layout, and a sealing hole is provided at the corner of the zigzag. The sealing hole reduces the difficulty of processing and manufacturing while providing a maintenance position. A sealing plug is provided on the sealing hole to meet the sealing requirements. The inner end of the sealing plug and the inner wall of the sealing hole together form a transition corner to reduce the impact pressure generated by the flowing oil.

[0009] Preferably, the sealing hole extends outward to form a hole clamp, and the inner wall of the sealing hole is provided with a two-layer stepped structure, which is used to reduce the manufacturing requirements of the sealing hole end and maintain a good transition, while providing some inward deformation allowance during external extrusion welding, reducing stress and improving service life.

[0010] Preferably, the tail end of the sealing plug extends to the outside of the orifice clamp and is folded over to wrap around the orifice clamp, further providing a sealing effect. The side wall of the orifice clamp and the side wall of the sealing plug form an interference fit and provide a basis for welding contact.

[0011] Preferably, the filter element is inserted into the flow path housing, and the filter housing covers the outside of the filter element and engages with the flow path housing to facilitate replacement and other operations.

[0012] Preferably, sealing rings are provided between the filter housing and the flow path housing, and between the sealing plug and the sealing hole. Flanges are provided on the filter housing on both sides of the corresponding sealing rings to ensure the sealing effect.

[0013] The filter housing is provided with at least one sealing notch, and the sealing notch is opened on the outside of the sealing ring to avoid missed detection under high pressure.

[0014] Preferably, the sealing plug and the external shape of the sealing hole form a limiting shape, thereby ensuring the correct installation position and avoiding internal misalignment.

[0015] Preferably, the side wall of the folded end of the sealing plug is provided with a chamfer including a release groove, thereby reducing the stress generated by compression and improving the service life.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The gearbox oil circuit sealing structure of this application, by setting a sealing notch on the outside of the sealing ring, enables the effective detection of missing sealing rings, thus improving detection reliability. The oil circuit adopts a zigzag return path, and a sealing hole is set at the corner, which optimizes the spatial layout and facilitates processing and maintenance. At the same time, the hole clamp and double-layer stepped structure reduce the manufacturing precision requirements and provide deformation allowance during welding, reducing stress concentration and extending service life. The tail end of the sealing plug is folded over to wrap the hole clamp, forming an interference fit and providing a welding contact surface, thereby enhancing the sealing effect and welding firmness. The shape of the plug and the hole wall form a limit to avoid assembly misalignment; a release groove chamfer is set at the folded tail end to alleviate stress concentration. The filter element is inserted into the housing, and the filter housing meshes with the sealing ring and flange design, improving the convenience of replacement and the overall sealing reliability. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the present invention;

[0018] Figure 2 This is an exploded view I of the present invention;

[0019] Figure 3 This is an exploded view of the present invention (II).

[0020] Figure 4 This is a cross-sectional view of the return flow path of this utility model;

[0021] Figure 5 This is a cross-sectional perspective view of the present invention;

[0022] Figure 6 This is a cross-sectional view of the sealing hole portion of this utility model;

[0023] Figure 7 This is a schematic diagram of the installation of the sealing plug body of this utility model;

[0024] Figure 8 This is a schematic diagram showing the location of the solder joints in this utility model;

[0025] Figure 9 This is a structural diagram showing the location of the sealing defect in this utility model;

[0026] Figure 10 This is a structural diagram of the sealing plug of this utility model.

[0027] In the diagram: 1. Flow path housing, 101. Limiting protrusion, 2. Filter section, 201. Filter housing, 202. Filter element, 203. Flange, 204. Sealing notch, 3. Return hole, 4. Inlet, 5. Return flow path, 6. Sealing hole, 601. Hole clamp, 602. Retraction platform, 7. Sealing plug, 701. Release groove, 702. Limiting point, 8. Sealing ring. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-10 This utility model provides a technical solution: a sealing structure for a transmission oil circuit, including a flow path housing 1 and a filter section 2. The filter section 2 is connected to an inlet 4 and a return hole 3. The filter section 2 includes a filter housing 201 and a filter element 202. Lubricating oil enters the interior of the filter section 2 through the inlet 4 and then flows out from the return hole 3. Specifically, the return hole 3 is far away from the filter section 2, and the filter section 2 and the return hole 3 are connected through a return flow path 5, thereby reducing the impact of pressure fluctuations. Figure 4 The return path 5 shown is zigzag-shaped, with a sealing hole 6 at the bend of the zigzag. A sealing plug 7 is provided on the sealing hole 6, and the inner end of the sealing plug 7 and the inner wall of the sealing hole 6 together form a transition bend. Figure 4 The diagram illustrates how this smooth transition reduces the impact force generated during oil flow.

[0030] Specifically, the sealing hole 6 extends outward to form a hole clamp 601, and the inner wall of the sealing hole 6 is provided with a two-layer stepped structure 602, such as... Figure 6 The first-layer stepped-back structure 602 shown allows the head of the sealing plug 7 to form a good transition with the interior of the sealing hole 6 without having to be made particularly sharp, thereby reducing manufacturing costs. The tail end of the sealing plug 7 extends to the outside of the hole clamp 601 and is folded over to wrap the hole clamp 601. The side wall (welding point position) of the hole clamp 601 forms an interference fit with the side wall of the sealing plug 7.

[0031] Furthermore, the side wall of the folded-over end of the sealing plug 7 is provided with a chamfer containing a release groove 701 (e.g., Figure 10 This section, in conjunction with the second-layer stepped-back platform 602, ensures a tight fit, providing a foundation for ultrasonic welding and facilitating stable, comprehensive, and robust ultrasonic welding. The welding area is as follows... Figure 8 The shaded area shown (during the actual welding process, the external ultrasonic welding equipment presses down and contacts the tail end of the sealing plug 7 to perform the relevant welding process), and the release groove 701 is used to release some stress (for the inner layer weld area) to improve durability.

[0032] Specifically, the filter element 202 is inserted into the flow path housing 1, such as... Figure 2 and Figure 3 As shown, the filter housing 201 covers the outside of the filter element 202 and engages with the flow path housing 1. Thus, when replacing the filter element 202, the filter element 202 can be partially inserted into the flow path housing 1 and then the filter housing 201 can be screwed on for easy operation.

[0033] Specifically, sealing rings 8 are provided between the filter housing 201 and the flow path housing 1, and between the sealing plug 7 and the sealing hole 6, such as Figure 5 The diagram shows that it provides a certain degree of sealing.

[0034] The filter housing 201 has flanges 203 on both sides of the corresponding sealing ring 8. Since they are all made of plastic materials such as nylon 66, if there is a problem with the assembly or the sealing ring 8 on the filter housing 201 is not installed, it can still prevent leakage through its own mechanical seal (such as flanges 203 or threads) under low pressure. However, pressure fluctuations during operation may cause leakage. If the inspection pressure is increased, the process time and cost will be increased. Therefore, at least one sealing notch 204 is provided on the filter housing 201, and the sealing notch 204 is opened on the outside of the sealing ring 8. This structure can detect whether the sealing ring 8 on the filter housing 201 is missing during the original process without affecting the original sealing effect.

[0035] Since the orientation of the head of the sealing plug 7 cannot be observed during installation, the correct installation direction must be ensured to guarantee a smooth transition with the inner wall. Figure 7 and 10 As shown, a limiting protrusion 101 is provided on the flow path housing 1 (outside the sealing hole 6), and a limiting point 702 is provided on the sealing plug 7. When the limiting protrusion 101 is located between the two limiting points 702 during installation, the internal installation orientation can be guaranteed to be correct, that is, the sealing plug 7 and the external shape of the sealing hole 6 form a limit.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a transmission oil circuit, comprising a flow path housing (1) and a filter section (2), wherein the filter section (2) is connected to an inlet (4) and a return hole (3) respectively, and the filter section (2) comprises a filter housing (201) and a filter element (202). Its features are: The return hole (3) is located away from the filter section (2), and the filter section (2) and the return hole (3) are connected by a return path (5). The return path (5) is zigzag-shaped, and a sealing hole (6) is provided at the corner of the zigzag. A sealing plug (7) is provided on the sealing hole (6), and the inner end of the sealing plug (7) and the inner wall of the sealing hole (6) together form a transition corner.

2. The sealing structure for a transmission oil circuit according to claim 1, characterized in that: The sealing hole (6) extends outward to form a hole hoop (601), and the inner wall of the sealing hole (6) is provided with a two-layer stepped platform (602) structure.

3. The sealing structure for a transmission oil circuit according to claim 2, characterized in that: The tail end of the sealing plug (7) extends to the outside of the hole clamp (601) and is folded over to wrap the hole clamp (601). The side wall of the hole clamp (601) and the side wall of the sealing plug (7) form an interference fit.

4. The sealing structure for a transmission oil circuit according to claim 1, characterized in that: The filter element (202) is inserted into the flow path housing (1), and the filter housing (201) covers the outside of the filter element (202) and engages with the flow path housing (1).

5. The sealing structure for a transmission oil circuit according to claim 1, characterized in that: A sealing ring (8) is provided between the filter housing (201) and the flow path housing (1), and between the sealing plug (7) and the sealing hole (6).

6. The sealing structure for a transmission oil circuit according to claim 5, characterized in that: The filter housing (201) is provided with flanges (203) on both sides of the corresponding sealing ring (8).

7. The sealing structure for a transmission oil circuit according to claim 6, characterized in that: At least one sealing notch (204) is provided on the filter housing (201), and the sealing notch (204) is opened on the outside of the sealing ring (8).

8. The sealing structure of the transmission oil circuit according to claim 1, characterized in that: The sealing plug (7) and the sealing hole (6) form a limiting shape.

9. The sealing structure for a transmission oil circuit according to claim 3, characterized in that: The side wall of the tail end fold of the sealing plug (7) is provided with a chamfer containing a release groove (701).

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