Matching structure of plastic joint and rubber pipeline

Abstract

The utility model discloses a matching structure of a plastic joint and a rubber pipeline, relates to the technical field of an air inlet system of an automobile engine, and aims to solve the problems of inaccurate circumferential positioning, insufficient axial anti-falling reliability and no clear indication of the position of a hoop in the conventional matching structure. The structure comprises a plastic connector and a rubber pipe, an annular protrusion with a notch structure is arranged in the middle of the plastic connector, positioning protrusions in one-to-one correspondence with notches are arranged on the rear end wall of the rubber pipe, and circumferential positioning is achieved through mechanical meshing of the notches and the protrusions. The front end of the plastic connector is provided with a conical inverted buckle anti-disengaging table, an anti-disengaging groove is formed in the corresponding position of the inner wall of the rubber pipe, and axial anti-disengaging is achieved through clamping of an inverted buckle and the groove. The peripheral wall of the rubber pipe is provided with a protruding indication strip extending in the axial direction, and the protruding indication strip is used for indicating the clamping position of the single-lug electrodeless clamp. According to the utility model, the assembly efficiency and the connection reliability are effectively improved through a'positioning-anti-falling-sealing 'cooperative mechanism, and the strict requirement of an automobile engine air inlet system on pipeline connection is met.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive engine intake systems, specifically to a mating structure of a plastic connector and a rubber hose. Background Technology

[0002] In the intake system of an automobile engine, the downstream branch line of the air filter (i.e., the "clean side line") plays a crucial role in delivering filtered clean air to the engine, and its connection reliability directly affects the engine's intake efficiency and operational stability.

[0003] This piping system needs to integrate multiple branch pipes such as crankcase ventilation pipes and carbon fiber pipes. The interfaces of these branches typically use a structure that combines plastic connectors (lightweight and low cost) with rubber hoses (flexible and shock-absorbing). Therefore, the assembly quality of the plastic connectors and rubber hoses (such as positional accuracy, connection sealing, and anti-detachment capability) is a core prerequisite for ensuring the function of the entire intake system.

[0004] The existing assembly technology for plastic joints and rubber hoses has the following shortcomings:

[0005] Shortcoming 1: Lack of an effective circumferential positioning structure, which poses a risk of misassembly.

[0006] In existing technologies, the circumferential positioning of plastic joints and rubber hoses mainly relies on two methods: ① frictional limiting after clamping; ② rough guidance by the geometric shape of the outer contour of the pipe joint (such as conical or stepped). Neither of these methods can achieve precise circumferential positioning, which causes the plastic joint to easily rotate circumferentially relative to the rubber hose during assembly (specific manifestations), thereby causing misalignment of branch pipe interfaces and interference with other components.

[0007] Correspondingly, this patent establishes a brand-new technical approach to achieve circumferential positioning through the combination of "notch-protrusion".

[0008] Shortcoming 2: The axial anti-detachment structure is not reliable enough and there is a risk of detachment.

[0009] Existing methods for preventing axial detachment of rubber hoses and plastic joints rely on the radial clamping force of a single-ear clamp or simple barbs at the end of the joint. However, rubber hoses are prone to aging and loosening due to long-term vibration and temperature changes (specific manifestations), leading to a decrease in clamping force or insufficient barb embedding depth, ultimately causing axial detachment (a defect in effectiveness).

[0010] Correspondingly, this patent utilizes the elastic properties of rubber materials to create a new technical route for preventing detachment through mechanical interlocking of "plastic buckle-rubber anti-detachment groove," replacing the traditional anti-detachment upgrade route that uses high-strength plastic clamps and increased clamping pressure.

[0011] Defect 3: The clamping position is not clearly indicated, which can easily lead to seal failure due to incorrect installation.

[0012] In existing technologies, the installation position of single-ear stepless clamps relies on the operator's experience or blurry printed markings on the pipeline surface (such as the text "clamp area"), lacking physical positioning characteristics (structural defects). This can cause the clamp to deviate from the optimal clamping position (specific manifestations), resulting in insufficient local sealing pressure and causing air leakage (performance defects).

[0013] Correspondingly, this patent establishes a completely new technical approach that uses a raised indicator strip on a rubber tube to indicate the position of the clamp.

[0014] In summary, existing mating structures for plastic connectors and rubber hoses have significant defects in three aspects: circumferential positioning, axial anti-detachment, and clamp position indication. These defects lead to low assembly efficiency, high risk of incorrect installation, and insufficient long-term reliability, failing to meet the stringent requirements of automotive intake systems for connection accuracy and stability. Therefore, there is an urgent need to design a novel mating structure that integrates "precise positioning, reliable anti-detachment, and clear clamp position indication" to address the pain points of existing technologies—this is precisely the core objective of this utility model patent. Utility Model Content

[0015] The purpose of this utility model is to provide a mating structure for a plastic connector and a rubber hose, which achieves circumferential positioning through a "notch-protrusion" fit, eliminating the risk of misinstallation.

[0016] To achieve the above objectives, this utility model provides a mating structure for a plastic connector and a rubber hose, comprising a plastic connector and a rubber hose, wherein the axial direction of the plastic connector is the front-to-back direction, the direction in which the plastic connector is inserted into the rubber hose is the forward direction, and the reverse direction is the rear direction.

[0017] The plastic connector has a radially protruding annular structure in the middle, which is used to press against the wall of the rubber tube. The annular structure has at least one notch structure, and the rear end wall of the rubber tube has at least one positioning protrusion. The positioning protrusion corresponds one-to-one with the notch structure. The positioning protrusion is inserted into the notch structure to achieve circumferential positioning of the plastic connector and the rubber tube.

[0018] The outer peripheral wall of the front end of the plastic connector is also provided with a tapered anti-detachment platform that is smaller at the front and larger at the back. The inner wall of the rubber tube is provided with an anti-detachment groove corresponding to the position of the tapered anti-detachment platform. The tapered anti-detachment platform and the anti-detachment groove engage to limit the axial relative displacement between the plastic connector and the rubber tube.

[0019] The outer peripheral wall of the rubber tube is provided with at least one raised indicator strip, which extends along the axial direction of the rubber tube and is used to indicate the clamping position of the single-ear infinite clamp.

[0020] The notch structure is a rectangular groove, and the positioning protrusion is a rectangular protrusion, the size of which is adapted to the size of the rectangular groove.

[0021] The rear surface of the tapered inverted anti-detachment platform is a plane perpendicular to the axis of the plastic connector.

[0022] This utility model has the following advantages:

[0023] The mechanical engagement between the notch structure and the positioning protrusion effectively prevents the plastic joint and the rubber tube from rotating circumferentially after assembly, ensuring accurate relative positioning and avoiding the risk of misassembly.

[0024] The mechanical locking of the conical inverted anti-detachment platform and the anti-detachment groove can effectively limit the relative displacement of the plastic joint and the rubber tube in the axial direction, preventing them from falling off due to vibration or aging during long-term use.

[0025] The raised indicator strip serves as a physical marker, ensuring that the single-ear stepless clamp is installed in a unique and accurate position, thus preventing seal failure due to positional deviation.

[0026] The rigid fit between the rectangular groove and the rectangular protrusion provides a stable circumferential positioning force, avoiding positioning failure caused by deformation during assembly and further improving positioning accuracy.

[0027] The tapered inclined surface (smaller at the front and larger at the back) facilitates the insertion of the rubber tube during assembly, while the vertical plane provides reliable anti-detachment resistance in the axial direction, balancing assembly convenience and anti-detachment reliability.

[0028] Overall, this utility model effectively improves assembly efficiency and connection reliability through a coordinated "positioning-anti-detachment-sealing" mechanism, meeting the stringent requirements of automotive engine intake systems for pipeline connections. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of the present invention in its assembled state.

[0030] Figure 2 yes Figure 1 A-A sectional view.

[0031] Figure 3 This is a three-dimensional structural diagram of the present invention in its assembled state.

[0032] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0033] Component / Structure Description:

[0034] 1. Plastic connector 1

[0035] Installation position: It is used in conjunction with rubber tube 2 and inserted into the rubber tube as the connecting body.

[0036] Structural relationship: The middle part is provided with a ring structure 3, the front outer peripheral wall is provided with a conical inverted anti-detachment platform 6, and the ring structure 3 is machined with a notch structure 4.

[0037] Working principle and technical function: The annular structure 3 and the rubber tube 2 are pressed together to provide a basic seal; the notch structure 4 and the positioning protrusion 5 of the rubber tube are mechanically engaged to achieve circumferential positioning and prevent relative rotation after assembly; the conical inverted anti-detachment platform 6 and the anti-detachment groove of the rubber tube are engaged to form an axial mechanical lock and avoid detachment caused by long-term vibration or aging.

[0038] 2. Rubber hose 2

[0039] Installation location: The insertion end of the plastic connector 1 is a flexible connecting component that fits the structure.

[0040] Structural relationship: The rear end wall (the end that mates with the plastic connector) is provided with a positioning protrusion 5, the inner wall is provided with an anti-detachment groove at the corresponding position, and the outer peripheral wall is provided with a protruding indicator strip 7.

[0041] Working principle and technical function: The positioning protrusion 5 is inserted into the notch structure 4 of the plastic connector, and the circumferential rotation is restricted by rigid fit; the anti-detachment groove and the conical inverted anti-detachment platform 6 engage, and the axial anti-detachment is achieved by using the elasticity of rubber; the protrusion indicator strip 7 provides a physical positioning mark for the single-ear infinite clamp 8, ensuring that the clamp is accurately clamped to the mating surface.

[0042] 3. Ring structure

[0043] Installation location: The plastic connector 1 is located in the middle and protrudes radially.

[0044] Structural relationship: The annular protrusion is in pressure contact with the inner wall of the rubber tube 2.

[0045] Working principle and technical function: The radial protrusions fit tightly against the wall of the rubber tube, enhancing the sealing of the mating surfaces, and providing an installation base for the notch structure 4.

[0046] 4. Gap Structure 4

[0047] Installation location: On the ring structure 3, at least one is distributed along the circumference.

[0048] Structural relationship: Preferably a rectangular groove, the size of which is adapted to the positioning protrusion 5 of the rubber tube.

[0049] Working principle and technical function: It forms a "notch-protrusion" mechanical engagement with the positioning protrusion 5, and restricts the circumferential relative rotation of the plastic joint 1 and the rubber tube 2 through rigid fit, so as to avoid misalignment of branch pipe interfaces or interference with other components.

[0050] 5. Positioning protrusion 5.

[0051] Installation location: The rear end wall of rubber tube 2 (the end wall that mates with the plastic connector) protrudes circumferentially.

[0052] Structural relationship: preferably rectangular protrusions, which correspond one-to-one with the notch structure 4 and are size-matched.

[0053] Working principle and technical function: After the insertion notch structure 4 is inserted, circumferential positioning is formed. The rigid cooperation between the protrusion and the groove prevents the plastic joint 1 from rotating relative to the rubber tube 2, ensuring accurate assembly direction and eliminating the risk of misassembly.

[0054] 6. Conical inverted anti-detachment platform 6.

[0055] Installation location: outer peripheral wall of the front end of plastic connector 1, extending axially.

[0056] Structural relationship: a tapered structure with a smaller front and a larger rear, with the rear surface being a plane perpendicular to the axis of the plastic connector.

[0057] Working principle and technical function: During assembly, the tapered inclined surface guides the rubber tube 2 and its own elastic deformation, making it easy to insert; the vertical plane of the rear surface engages with the inner wall of the anti-detachment groove of the rubber tube to form an axial mechanical lock, dynamically preventing the plastic joint 1 from axially falling off due to vibration or aging.

[0058] 7. Raised indicator bar 7.

[0059] Installation location: outer peripheral wall of rubber tube 2, extending axially.

[0060] Structural relationship: At least one raised physical mark is distributed along the axial direction of the rubber tube.

[0061] Working principle and technical function: As the only clamping position indicator of the single-ear infinite clamp 8, the clamp position is visualized through the structure of the rubber tube itself, ensuring that the clamp pressure is concentrated on the mating surface and avoiding local sealing failure (such as air leakage) caused by position deviation.

[0062] 8. Single-ear stepless clamp 8.

[0063] Installation location: It is fitted onto the raised indicator strip 7 of the rubber tube 2.

[0064] Structural relationship: A ring-shaped metal clamp, when tightened, presses the mating surfaces of the rubber tube and the plastic joint.

[0065] Working principle and technical function: Under the guidance of the raised indicator strip 7, precise positioning is achieved. The radial clamping force enhances the sealing effect between the rubber tube 2 and the plastic joint 1, and the "positioning-anti-detachment" mechanism is assisted to improve the overall connection reliability. Detailed Implementation

[0066] like Figures 1 to 4 As shown, the mating structure of the plastic connector and rubber tube 2 of this utility model includes a plastic connector 1 and a rubber tube 2. The axial direction of the plastic connector 1 is the front-back direction, the direction in which the plastic connector 1 is inserted into the rubber tube 2 is the forward direction, and the reverse direction is the backward direction.

[0067] The plastic connector 1 has a radially protruding annular structure 3 in the middle, which is used to press against the wall of the rubber tube 2. The annular structure 3 has at least one notch structure 4, and the rear end wall of the rubber tube 2 (the end wall that mates with the plastic connector 1) has at least one positioning protrusion 5. The positioning protrusion 5 corresponds one-to-one with the notch structure 4, and the positioning protrusion 5 is inserted into the notch structure 4 to achieve circumferential positioning of the plastic connector 1 and the rubber tube 2. Preferably, one positioning protrusion 5 is provided, which is sufficient to meet the circumferential positioning requirements.

[0068] The mechanical engagement between the notch structure 4 and the positioning protrusion 5 effectively prevents the plastic connector 1 and the rubber tube 2 from rotating circumferentially after assembly, ensuring accurate relative positions of the two and avoiding the risk of misassembly.

[0069] The outer peripheral wall of the front end of the plastic connector 1 is also provided with a tapered anti-detachment platform 6, which is smaller at the front and larger at the back. The inner wall of the rubber tube 2 is provided with an anti-detachment groove corresponding to the position of the tapered anti-detachment platform 6. The tapered anti-detachment platform 6 and the anti-detachment groove engage to limit the axial relative displacement between the plastic connector 1 and the rubber tube 2. The anti-detachment groove and the tapered anti-detachment platform 6 occupy the same spatial position in the figure and are not separately labeled.

[0070] The mechanical locking of the conical inverted anti-detachment platform 6 and the anti-detachment groove can effectively limit the relative displacement of the plastic joint 1 and the rubber tube 2 in the axial direction, preventing them from falling off due to vibration or aging during long-term use.

[0071] The outer peripheral wall of the rubber tube 2 is provided with at least one raised indicator strip 7, which extends axially along the rubber tube 2 and is used to indicate the clamping position of the single-ear stepless clamp 8. Through the physical marking function of the raised indicator strip 7, the installation position of the single-ear stepless clamp 8 can be ensured to be unique and accurate, avoiding sealing failure due to positional deviation.

[0072] The notch structure 4 is a rectangular groove, and the positioning protrusion 5 is a rectangular bump. The size of the rectangular bump is adapted to the size of the rectangular groove. The rigid fit between the rectangular groove and the rectangular bump provides a stable circumferential positioning force, avoiding positioning failure caused by deformation during assembly and further improving positioning accuracy.

[0073] The rear surface of the tapered anti-detachment platform 6 is a plane perpendicular to the axis of the plastic connector 1. The tapered inclined surface (smaller at the front and larger at the back) facilitates the insertion of the rubber tube 2 during assembly, and the vertical plane provides reliable anti-detachment resistance in the axial direction, balancing assembly convenience and anti-detachment reliability.

[0074] The usage process of this utility model is as follows:

[0075] I. Pre-assembly preparation stage.

[0076] Component inspection: Confirm that the notch structure 4 of the plastic connector 1 and the tapered undercut anti-detachment platform 6 are free of burrs or deformation, and that the positioning protrusion 5, anti-detachment groove and protrusion indicator strip 7 of the rubber tube 2 are complete and undamaged, and that the positions of each structure correspond (e.g., the notch and protrusion are aligned in the circumferential position, and the undercut and anti-detachment groove correspond in the axial position).

[0077] Direction definition confirmation: The direction in which the plastic connector 1 is inserted into the rubber tube 2 is "forward". During assembly, keep the front end of the plastic connector 1 (the end with the tapered anti-detachment platform 6) facing the open end of the rubber tube 2.

[0078] II. Core assembly steps.

[0079] Step 1: Insert.

[0080] Operation: Insert the front end of the plastic connector 1 into the rubber tube 2, align the positioning protrusion 5 of the rubber tube 2 with the notch structure 4 of the plastic connector 1, and push the plastic connector 1 forward along the axial direction so that the protrusion is embedded in the notch.

[0081] The rectangular groove of the notch structure 4 and the rectangular protrusion of the positioning protrusion 5 form a mechanical engagement, restricting the relative rotation of the two in the circumferential direction. The rigid fit achieves precise circumferential positioning and avoids misinstallation (such as misalignment of branch pipe interfaces).

[0082] Simultaneously (with the protrusion embedded in the notch), the conical inverted anti-detachment platform 6 of the plastic connector 1 is fully embedded in the anti-detachment groove of the rubber tube 2. During the forward insertion process, the inclined surface of the conical inverted anti-detachment platform 6 guides the rubber tube 2 and the plastic connector 1 to undergo different degrees of elastic deformation. After passing through, the rubber tube 2 and the plastic connector 1 return to their original shape, and the rear vertical plane of the conical inverted anti-detachment platform 6 engages with the inner wall of the anti-detachment groove, forming an axial mechanical lock, realizing dynamic anti-detachment, and avoiding the axial detachment of the plastic connector 1 due to long-term vibration or aging.

[0083] Step 2: Clamp position calibration.

[0084] Operation: Place the single-ear stepless clamp 8 onto the raised indicator strip 7 of the rubber tube 2, and then tighten the clamp. The raised indicator strip 7 extends axially to form a physical mark, defining the unique clamping position of the clamp and ensuring that the clamp pressure is concentrated on the mating surface between the rubber tube 2 and the plastic connector 1. This solves the problem of existing technology "relying on manual experience to position the clamp," and makes the clamp position visible through the structure of the rubber tube 2 itself, avoiding poor sealing (such as local leakage) caused by positional deviation.

[0085] III. Summary of the Overall Work Process

[0086] This utility model establishes a collaborative mechanism of "positioning-anti-detachment-sealing" through a three-step assembly process of "circumferential positioning → axial locking → clamp calibration".

[0087] Circumferential: The notch-protrusion fit prevents relative rotation;

[0088] Axial: Conical inverted anti-detachment platform 6 - anti-detachment groove engages to prevent axial detachment;

[0089] Sealing aid: Raised indicator strip 7 ensures precise clamping of the clamp.

[0090] The combined effect of these three components significantly improves the assembly efficiency of the plastic connector 1 and the rubber hose 2 (reducing rework due to incorrect assembly), enhances connection reliability (no detachment or leakage during long-term vibration testing), and fully meets the stringent requirements of the automotive engine intake system for pipeline connections.

[0091] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mating structure for a plastic connector and a rubber hose, comprising a plastic connector and a rubber hose, characterized in that: With the axial direction of the plastic connector as the front-back direction, the direction in which the plastic connector is inserted into the rubber tube is the forward direction, and the opposite direction is the backward direction; The plastic connector has a radially protruding annular structure in the middle, which is used to press against the wall of the rubber tube. The annular structure has at least one notch structure, and the rear end wall of the rubber tube has at least one positioning protrusion. The positioning protrusion corresponds one-to-one with the notch structure. The positioning protrusion is inserted into the notch structure to achieve circumferential positioning of the plastic connector and the rubber tube.

2. The mating structure according to claim 1, characterized in that: The outer peripheral wall of the front end of the plastic connector is also provided with a tapered anti-detachment platform that is smaller at the front and larger at the back. The inner wall of the rubber tube is provided with an anti-detachment groove corresponding to the position of the tapered anti-detachment platform. The tapered anti-detachment platform and the anti-detachment groove engage to limit the axial relative displacement between the plastic connector and the rubber tube.

3. The mating structure according to claim 1, characterized in that: The outer peripheral wall of the rubber tube is provided with at least one raised indicator strip, which extends along the axial direction of the rubber tube and is used to indicate the clamping position of the single-ear infinite clamp.

4. The mating structure according to claim 1, characterized in that: The notch structure is a rectangular groove, and the positioning protrusion is a rectangular protrusion, the size of which is adapted to the size of the rectangular groove.

5. The mating structure of a plastic joint and a rubber hose according to claim 2, characterized in that: The rear surface of the tapered inverted anti-detachment platform is a plane perpendicular to the axis of the plastic connector.

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