Composite connection structure of hybrid transmission cylinder plug-in

Abstract

The utility model provides a kind of hybrid gearbox cylinder plug-in connector's composite connection structure, including cylinder penetrating part and wire end connecting part, two cavities of cylinder connecting cavity and wire connecting cavity are equipped in cylinder penetrating part, first sealing element is equipped on the outer wall of cylinder penetrating part, multiple terminal pins are arranged in cylinder connecting cavity, cylinder connecting cavity and wire connecting cavity have partition wall in the middle, terminal passageway is equipped on partition wall, wire end connecting part is pluggable in wire connecting cavity, second sealing element is equipped in the outer circle of one end of wire end connecting part close to cylinder connecting cavity, multiple wire connecting passageways are set in wire end connecting part, connecting sleeve and third sealing element are equipped in each wire connecting passageway, first elastic buckle is equipped in wire connecting passageway close to one end of cylinder penetrating part, connecting sleeve is connected with first elastic buckle, the conductive core wire of wire harness passes third sealing element through connecting sleeve and terminal pin connection. The present application solves the problems of insufficient sealing reliability, electrical connection loosening in vibration environment and inconvenient maintenance in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of automotive wiring harness technology, and in particular to a composite connection structure for a hybrid transmission cylinder-through connector. Background Technology

[0002] In hybrid transmission systems, reliable electrical connections are required between external control signals and power supplies and internal sensors and actuators (such as solenoid valves). Because the transmission is filled with high-temperature, high-pressure transmission fluid and experiences strong mechanical vibrations and electromagnetic interference, the connectors penetrating the transmission block must overcome three core technical challenges: first, ensuring absolute sealing to prevent fluid leakage under long-term oil immersion and temperature cycling conditions; second, ensuring continuous stability and reliability of the electrical connection in vibration environments; and third, facilitating production assembly and after-sales maintenance.

[0003] Existing cylinder-through connector solutions often suffer from the following shortcomings: Firstly, using a single sealing structure can lead to decreased sealing performance due to material aging or interface failure after long-term use. Secondly, employing non-removable structures such as integral potting or molding means that damage to any component requires replacement of the entire assembly, resulting in high maintenance costs. Thirdly, inconsistencies in assembly processes make it difficult to guarantee consistency during mass production. Therefore, there is an urgent need for an innovative solution that integrates multiple seals, highly reliable connections, and convenient maintenance. Utility Model Content

[0004] In view of the above, this utility model provides a composite connection structure for a hybrid transmission cylinder connector to solve the problems of insufficient sealing reliability, easy loosening of electrical connections under vibration environment, and inconvenient maintenance in the prior art.

[0005] The present invention specifically adopts the following technical solution: a composite connection structure for a hybrid transmission cylinder-through connector, comprising a cylinder-through portion and a wire-end connection portion. The cylinder-through portion contains two cavities: a cylinder-connecting cavity and a wire-connecting cavity. A first sealing element is provided on the outer wall of the cylinder-through portion. Multiple terminal pins are arranged within the cylinder-connecting cavity. A partition wall is provided between the cylinder-connecting cavity and the wire-connecting cavity, and a terminal channel is provided on the partition wall for the terminal pins to pass through. The wire-end connection portion is pluggably disposed within the wire-connecting cavity. A second sealing element is provided on the outer ring of the wire-end connection portion near the cylinder-connecting cavity. Multiple wire-connecting channels are arranged along the length of the wire-end connection portion. A connecting sleeve and a third sealing element are provided in each wire-connecting channel. The wire-connecting channel corresponds to the terminal pin. A first elastic buckle is provided at the end of the wire-connecting channel near the cylinder-through portion. The connecting sleeve engages with the first elastic buckle. The conductive core wire of the wire harness passes through the third sealing element and connects to the terminal pin through the connecting sleeve.

[0006] As a further improved technical solution, the connecting sleeve includes an integrally connected electrical connection section and a clamp, the clamp being used to snap and fix one end of the third sealing element, and the side wall of the electrical connection section being snap and fixed with the first elastic buckle.

[0007] As a further improved technical solution, a guide plug plate is provided at the end of the wire connection part near the cylinder part. A guide plug hole is opened on the guide plug plate corresponding to the position of each of the wire channels. The front end of the terminal pin passes through the guide plug hole in sequence and then docks with the electrical connection section of the connecting sleeve.

[0008] As a further improved technical solution, the electrical connection section is provided with a fixed crimping end for fixed connection with the conductive core wire in the wire harness, and a plug-in end for insertion and engagement with the end of the terminal pin.

[0009] As a further improved technical solution, the third sealing element includes a main body and a multi-ring protrusion on the outer wall of one end of the main body, wherein the main body is a hollow cylindrical structure.

[0010] As a further improved technical solution, the outer ring of the end of the wire end connection near the cylinder cavity is provided with a retaining groove, and the retaining groove is also provided with a wedge-shaped annular groove on one side wall of its end. The second sealing member is ring-fitted and locked in the retaining groove, and its corresponding side is tightly embedded in the wedge-shaped annular groove by interference fit to form axial limit. The outer wall of the second sealing member is provided with multiple rings of protrusions, and the protrusions protrude from the outer wall plane of the wire end connection.

[0011] As a further improved technical solution, multiple grooves are provided parallel to each other on the outer wall of the cylinder section, and the first sealing element is sleeved in the grooves.

[0012] As a further improved technical solution, at least one second elastic buckle is provided on the outer wall of the wire end connection part, and a locking part is provided at the corresponding position on the inner wall of the connecting cavity of the cylinder part. When the wire end connection part is inserted into place, the second elastic buckle is engaged with the locking part.

[0013] As a further improved technical solution, the first seal, the second seal, and the third seal are made of silicone rubber or fluorosilicone rubber.

[0014] As a further improved technical solution, a layer of sealant is provided along the bottom of the terminal pin inside the cylinder cavity.

[0015] The composite connection structure of the hybrid gearbox cylinder connector of this utility model has the following beneficial effects: 1. The first seal provides a static seal between the cylinder section and the gearbox housing; the second seal provides an interface seal between the wire end connection and the connecting cavity; and the third seal provides an individual cable seal between the wiring harness and the connection. This multi-stage sealing design forms multiple leak-proof barriers, greatly improving the overall sealing reliability. Furthermore, a sealing layer is also provided at the bottom of the cylinder cavity to eliminate oil and vapor permeation paths.

[0016] 2. The first elastic clip inside the wiring channel provides independent axial positioning for each connecting sleeve. This prevents fretting wear or detachment between the connecting sleeve and the terminal pin under vibration, fundamentally ensuring the continuity of each electrical circuit connection. The second elastic clip outside the wire connection ensures a secure lock between the entire connector assembly and the gearbox housing, eliminating the systemic risk of connector loosening due to vibration. Multiple mechanical locking mechanisms ensure ultimate stability of the electrical connection under vibration.

[0017] 3. The wire end connector can be plugged in and unplugged independently. The connector sleeve, third seal and wire harness can be pre-assembled externally and then installed into the wire end connector as a whole. This facilitates automated production, ensures product consistency, and simplifies on-site assembly and maintenance processes. In case of damage, sub-components or wire end connectors can be replaced individually, reducing maintenance costs.

[0018] 4. The guide plate and its guide holes provide physical guidance and correction before the terminal pins come into contact with the connecting sleeve. This makes blind insertion of multiple pins and high density simple and reliable, and almost completely avoids the risk of bending or damage to the terminal pins. Attached Figure Description

[0019] Figure 1 This is an exploded view of the overall composite connection structure of the cylinder-through connector for the hybrid transmission in this application.

[0020] Figure 2 This is a partial schematic diagram of the wire end connection part of this application (without the guide plug plate).

[0021] Figure 3 This is a schematic cross-sectional view of the entire application.

[0022] Figure 4 This is a schematic diagram showing the connection between the connecting sleeve and the third sealing element in this application.

[0023] Figure 5 This is a schematic diagram of the composite connection structure of the cylinder-through connector for the hybrid transmission in this application. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0026] Reference Figure 1 and Figure 3 This embodiment discloses a composite connection structure for a hybrid transmission cylinder-through connector, comprising a cylinder-through portion 1 and a wire-end connection portion 2. The cylinder-through portion 1 is injection molded from oil-resistant engineering plastic. Internally, a partition wall 15 divides the cavity into a cylinder-connecting cavity 11 and a wire-connecting cavity 12. The cylinder-through portion 1 is installed in a pre-drilled hole in the transmission housing. Multiple annular grooves 17 machined on its outer wall embed a first sealing element 13. In this embodiment, the first sealing element 13 is preferably an annular sealing ring made of fluorosilicone rubber. Multiple high-conductivity copper alloy terminal pins 14 are matrix-arranged and embedded within the cylinder-connecting cavity 11. The terminal channel 16 on the partition wall 15 and the terminal pins 14 use a transition fit to ensure positioning accuracy. The inner wall of the wire-connecting cavity 12 is designed with a guiding structure, such as a guide angle at the entrance of the wire-connecting cavity 12, to facilitate precise insertion of the wire-end connection portion 2.

[0027] Further integration Figure 2 The wire end connector 2 is detachably disposed within the connecting cavity 12. At least one second elastic buckle 26 is provided on the outer wall of the wire end connector 2. The second elastic buckle 26 has a cantilever beam structure, with its root connected to the main body. Its free end has a guide slope and a hook. A corresponding engagement part 19 is provided on the inner wall of the connecting cavity 12 of the cylinder-penetrating part 1. The wire end connector 2 is inserted into the connecting cavity 12 of the cylinder-penetrating part 1 from one side and engages reliably with the engagement part 19 on the cylinder-penetrating part 1 via the elastic buckle 26 on its outer wall. When the wire end connector 2 is inserted, the guide slope contacts the end face of the cylinder-penetrating part 1, causing the elastic buckle 26 to elastically deform and retract until the hook slides into and engages with the engagement part 19 of the cylinder-penetrating part 1, accompanied by a clear clicking sound, indicating that the installation is complete. For disassembly, simply pinch the free end of the elastic buckle 26 to disengage it from the engagement part 19, and the wire end connector 2 can be pulled out.

[0028] Further reference Figure 3The outer circumference of the wire end connector 2 near the connecting cavity 11 is provided with a retaining groove 25. The retaining groove 25 also has a wedge-shaped annular groove 251 on one side wall. The second seal 21 is fitted and secured within the retaining groove 25, with its corresponding side tightly embedded in the wedge-shaped annular groove 251 through an interference fit, forming an axial limit. This effectively prevents the seal from coming out of the retaining groove, axial movement, or relative rotation within the cavity under repeated insertion / removal or long-term vibration. Preferably, the outer wall of the second seal 21 is provided with multiple raised strips 211. The cross-section of the raised strips is typically designed to be wedge-shaped or semi-circular. The raised strips 211 protrude from the outer wall plane of the wire end connector 2, and their outer diameter is larger than the inner diameter of the connecting cavity 12. When the wire end connector 2 is inserted into the connecting cavity 12, these raised strips 211 are compressed, forming extremely high surface contact pressure, providing a firm axial fixation and preventing the seal from shifting or twisting during repeated insertion / removal or vibration. Furthermore, the multiple raised ribs 211 form multiple independent sealing lips. Even if one raised rib 211 fails due to wear or assembly defects, the subsequent raised ribs 211 can still ensure the integrity of the seal. During insertion and removal, the edges of the raised ribs 211 can slightly scrape away impurities or grease that may adhere to the inner wall of the connecting cavity 12, which has a certain self-cleaning ability and helps maintain a long-term sealing effect.

[0029] Furthermore, multiple wiring channels 22 are arranged along the length of the internal part of the online connector 2. Each wiring channel 22 has a first elastic buckle 221 near the end of the cylinder-penetrating part 1. Each wiring channel 22 contains a connecting sleeve 24 and a third sealing element 23. The wiring channels 22 are correspondingly arranged with the terminal pins 14, i.e., a one-to-one correspondence in quantity and position. One end of the terminal pin 14 passes through the wiring channel 22 and mates with the connecting sleeve 24. The conductive core wire in the wire harness 3 passes through the third sealing element 23 and is electrically connected to the corresponding terminal pin 14 via the connecting sleeve 24. Specifically, as shown... Figure 4 The connecting sleeve 24 includes an electrical connection section 241 integrally stamped from phosphor bronze and a clamp 242. The clamp 242 is used to snap and fix one end of the third sealing member 23. The side wall of the electrical connection section 241 is snap and fixed with the first elastic buckle 221. The two ends of the electrical connection section 241 are respectively provided with a fixed crimping end 2411 for fixed connection with the conductive core wire in the wire harness, and a plug-in end 2412 for plugging and engaging with the end of the terminal pin 14. Figure 4 The fixed crimping end 2411 shown is the state after crimping the conductive core wire. Before crimping, it is in the shape of an extended sheet. When crimping, both sides simultaneously roll the conductive core wire inward. The sleeve 242 is also formed by two clips being punched and encircled to form a ring, which clamps the third sealing element.

[0030] The third seal 23 includes a main body 231 and multiple elastic annular protrusions 232 disposed on the outer wall of one end of the main body 231. The main body 231 has a hollow cylindrical structure, and the conductive core wire of the wire harness 3 passes through the interior of the main body 231. The cross-section of the annular protrusions 232 is preferably dome-shaped or hemispherical, which allows it to generate a uniform and large rebound force when subjected to radial compression. Preferably, three or more annular protrusions 232 are provided to form a multi-level sealing barrier. When the third seal 23 is pressed into the insertion section 222, these annular protrusions 232 are strongly compressed, and the resulting radial pressure allows it to form an absolutely reliable static seal with the inner wall of the insertion section 222. Each annular protrusion 232 undergoes elastic deformation independently with the inner wall of the channel, so even if one annular protrusion fails to seal due to damage or foreign matter, the subsequent annular protrusions 232 can still provide an effective seal. The third seal 23 and the second seal 21 are preferably integrally injection molded from high-strength, high-wear-resistant silicone rubber or fluorosilicone rubber materials.

[0031] In this invention, the first seal 13, the second seal 21, and the third seal 23 together constitute a defense-in-depth system. They address different leakage paths at different locations and with different mechanisms. The third seal 23 solves the radial sealing problem of the wiring harness, the second seal 21 solves the radial sealing problem of the interface, and the first seal 13 solves the static cylinder block sealing problem. This collaborative design ensures that even if any single sealing element experiences extreme performance degradation, the entire system can still maintain an effective sealing state, greatly improving the reliability of the product throughout the vehicle's lifecycle.

[0032] In addition, a guide plug plate 27 is provided at the end of the line terminal connection part 2 near the cylinder part 1. A guide plug hole 271 is provided on the guide plug plate 27 corresponding to the position of each connection channel 22. The front end of the terminal pin 14 passes through the guide plug hole 271 in sequence and then docks with the plug end 2412 of the electrical connection section.

[0033] The key assembly process of this invention is as follows: First, the sub-component is pre-assembled. That is, outside the wire end connection part 2, the clamp 242 of the connecting sleeve 24 is engaged with the front end of the main body 231 of the third seal 23. Then, the conductive core wire of the wire harness 3 is passed through the center of the third seal 23 to the fixed crimp end 2411. The fixed crimp end 2411 of the electrical connection section 241 and the conductive core wire are pressed together by the stamping process to form a complete "seal-connection-wire harness" sub-component.

[0034] Next, the entire assembly is installed as a whole. The sub-assembly is pressed axially into the inlet end of the wiring channel 22 of the wire end connector 2. When the electrical connection section 241 of the connecting sleeve 24 reaches the designated position, the groove or flange on its side wall will click into place with the first elastic buckle 221 on the inner wall of the wiring channel 22, thereby firmly positioning the entire sub-assembly axially within the wiring channel 22. At this time, the annular protrusion 232 of the third seal 23 forms an interference fit with the inner wall of the wiring channel 22, creating a tight seal.

[0035] Finally, complete the final docking, see [link / reference] Figure 3 In the first stage, the assembled wire end connector 2 is inserted into the wiring cavity 12 of the cylinder section 1. During this process, the terminal pin 14 on the cylinder section 1 first passes through the corresponding guide insertion hole 271 on the guide insertion plate 27. This step effectively corrects and guides the terminal pin 14, ensuring that its axis is aligned with the wiring channel 22. As insertion continues, the front end of the guided terminal pin 14 is accurately and unobstructedly inserted into the insertion end 2412 of the electrical connection section 241 of the connecting sleeve 24, forming a stable electrical connection. When the wire end connector 2 is fully inserted, the second sealing member 21 at its end compresses and seals against the inner wall of the wiring cavity 12, while the second elastic buckle 26 on its outer wall engages with the locking part 19 of the cylinder section 1, achieving a locking mechanism.

[0036] To further improve reliability, a layer of sealant 18 is injected into the cylinder cavity along the bottom of the terminal pin 14 to completely seal the root of the terminal pin 14. It can be oil-resistant fluorosilicone rubber potting compound or high-temperature resistant two-component silicone potting compound. The potting depth is controlled to completely cover the root of the terminal pin 14 and not exceed 1 / 3 of the height of the terminal pin, ensuring the sealing effect without affecting the electrical performance.

[0037] Additionally, a braided tube is wrapped around the conductive core wire. The conductive core wire is responsible for conductivity, while the outer braided shielding tube provides electromagnetic shielding and mechanical protection. The conductive core wire is preferably made of silver-plated copper wire to improve conductivity, and the braided tube is preferably made of tin-plated copper wire with a coverage rate of not less than 85%. The wire harness 3 is bundled and managed using cable ties, the spacing of which is optimized according to the wire harness diameter. Figure 5 A connection terminal 4 is connected to the end of the wire harness 3 that is away from the wiring cavity. The connection terminal 4 is selected according to the application scenario and has a standard interface with a waterproof rating of IP67 or higher, such as a connector, temperature sensor, solenoid valve, etc.

[0038] Furthermore, the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A composite connection structure for a cylinder-through connector in a hybrid transmission, characterized in that: The device includes a cylinder-through section and a wire-end connection section. The cylinder-through section contains two cavities: a cylinder-connecting cavity and a wire-connecting cavity. A first sealing element is provided on the outer wall of the cylinder-through section. Multiple terminal pins are arranged within the cylinder-connecting cavity. A partition wall is provided between the cylinder-connecting cavity and the wire-connecting cavity, and a terminal channel is provided on the partition wall for the terminal pins to pass through. The wire-end connection section is pluggably disposed within the wire-connecting cavity. A second sealing element is provided on the outer ring of the wire-end connection section near the cylinder-connecting cavity. Multiple wire-connecting channels are arranged along the length of the wire-end connection section. A connecting sleeve and a third sealing element are provided in each wire-connecting channel. The wire-connecting channel corresponds to the terminal pin. A first elastic buckle is provided at the end of the wire-connecting channel near the cylinder-through section. The connecting sleeve engages with the first elastic buckle. The conductive core wire of the wire harness passes through the third sealing element and connects to the terminal pin through the connecting sleeve.

2. The composite connection structure of the hybrid transmission cylinder connector according to claim 1, characterized in that: The connecting sleeve includes an electrical connection section and a clamp, the clamp being used to snap and fix one end of the third sealing element, and the side wall of the electrical connection section being snapped into the first elastic buckle.

3. The composite connection structure of the hybrid transmission cylinder connector according to claim 2, characterized in that: A guide plug plate is provided at the end of the wire connection near the cylinder section. A guide plug hole is provided on the guide plug plate corresponding to the position of each wire channel. The front end of the terminal pin passes through the guide plug hole in sequence and then connects with the electrical connection section of the connecting sleeve.

4. The composite connection structure of the hybrid transmission cylinder connector according to claim 2, characterized in that: The electrical connection section is provided with a fixed crimping end for fixed connection with the conductive core wire in the wire harness, and a plug-in end for insertion and engagement with the end of the terminal pin.

5. The composite connection structure of the hybrid transmission cylinder connector according to claim 1, characterized in that: The third sealing element includes a main body and multiple annular protrusions on the outer wall of one end of the main body. The main body is a hollow cylindrical structure.

6. The composite connection structure of the hybrid transmission cylinder connector according to claim 4, characterized in that: The outer ring of the end of the wire end connection near the cylinder cavity is provided with a retaining groove. The retaining groove is also provided with a wedge-shaped annular groove on one side wall. The second sealing member is ring-fitted and locked in the retaining groove, and its corresponding side is embedded in the wedge-shaped annular groove. The outer wall of the second sealing member is provided with multiple raised strips, which protrude from the outer wall plane of the wire end connection.

7. The composite connection structure of the hybrid transmission cylinder connector according to claim 1, characterized in that: Multiple grooves are provided parallel to each other on the outer wall of the cylinder section, and the first sealing element is fitted into the grooves.

8. The composite connection structure of the hybrid transmission cylinder connector according to any one of claims 1 or 7, characterized in that: At least one second elastic buckle is provided on the outer wall of the wire end connection part, and a locking part is provided at the corresponding position on the inner wall of the connecting cavity of the cylinder part. When the wire end connection part is inserted into place, the second elastic buckle engages with the locking part.

9. The composite connection structure of the hybrid transmission cylinder connector according to claim 1, characterized in that: The first seal, the second seal, and the third seal are made of silicone rubber or fluorosilicone rubber.

10. The composite connection structure of the hybrid transmission cylinder connector according to claim 1, characterized in that: A layer of sealant is provided along the bottom of the terminal pin inside the cylinder cavity.

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