New structure of RAST
By utilizing the new RAST structure, which employs a V-shaped cutting edge to pierce the insulation layer, a barbed snap-fit design, and an interference fit, the problems of low efficiency, high cost, and poor stability in the connection between the wire harness and the PCB board are solved, achieving a highly efficient and stable electrical connection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN KANGRUI ELECTRONIC CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-17
AI Technical Summary
Existing wire harnesses and PCB board connections suffer from low production efficiency, high cost, unstable connections, and poor locking structures, especially traditional terminals which are prone to falling off and have high insertion resistance.
The new RAST structure includes a housing, a PCB board, and connecting terminals. The connecting terminals are divided into a piercing structure, a middle anti-retraction structure, and a rear elastic clip. Stable electrical connection is achieved by directly piercing the insulation layer with a V-shaped blade, using barbed snap-fit to prevent detachment, and using interference fit for positioning.
It improves assembly efficiency, reduces production costs, ensures connection stability and reliability, is suitable for various wire harness specifications, and adapts to different scenario requirements.
Smart Images
Figure CN224520200U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic components technology, and in particular to a novel RAST structure. Background Technology
[0002] In existing technologies, the connection between wire harnesses and PCB boards typically relies on traditional soldering or crimping processes. However, these methods have the following significant drawbacks:
[0003] Welding and crimping require manual operation and rely on specialized tools, resulting in low production efficiency, high costs, and a high risk of connection instability due to operational errors. Traditional terminals lack effective mechanical locking mechanisms and are prone to detachment under vibration or external force, affecting the stability of equipment operation.
[0004] Existing locking structures for Insulation Displacement Connector (IDC) terminals (such as barbs or snaps) often suffer from high insertion resistance and a high risk of disengagement. For example, while Greenconn's Rast 2.5mm connector possesses IDC characteristics, its locking teeth do not match the mating holes precisely enough, which may affect its long-term stability. Utility Model Content
[0005] The main purpose of this invention is to provide a new RAST structure, which aims to solve the technical problems of high insertion resistance and high risk of disengagement that often exist in the locking structure of existing insulated displacement connection terminals.
[0006] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes a new structure for RAST, including a housing, a PCB board and connecting terminals, wherein the front of the housing is provided with a mounting slot and the PCB board is inserted into the mounting slot;
[0007] The mounting slot is provided with several equally spaced insertion holes, and the connecting terminal is fixed in the insertion holes and connected to the PCB board.
[0008] The upper surface of the housing is provided with a through hole that communicates with the plug hole, and the wire harness passes through the through hole and is connected to the connection terminal.
[0009] The connecting terminal includes a piercing structure at the front, a backstop structure in the middle, and an elastic clip at the rear.
[0010] The two side walls of the piercing structure are provided with locking teeth, and the inner wall of the insertion hole is provided with a tooth groove that engages with the locking teeth.
[0011] The elastic clip has a positioning protrusion, and the PCB board has a positioning hole that is interference-fitted with the positioning protrusion.
[0012] Furthermore, the piercing structure is used to pierce the insulation sheath of the wire harness to achieve electrical connection, and the elastic clip clamps and fixes the PCB board and is electrically connected to the circuit contacts on the PCB board.
[0013] Furthermore, the anti-reverse structure is a protrusion or a barb, and the insertion hole is provided with a slot that engages with the anti-reverse structure.
[0014] Furthermore, the locking tooth is a unidirectional sawtooth structure, with its tilt direction facing the opposite side of the insertion direction of the connecting terminal.
[0015] Furthermore, the positioning protrusion is a strip-shaped protrusion, and the size of the protrusion is larger than the diameter of the positioning hole on the PCB board.
[0016] Furthermore, the locking tooth has a tooth height of 0.1-0.3 mm, and the tooth inclination surface has an angle of 45°-60° with the vertical direction.
[0017] Furthermore, the positioning protrusion is located on the inner side of the clamping end of the elastic clip.
[0018] Furthermore, the anti-retraction structure consists of barbs symmetrically distributed on both sides of the middle section of the connecting terminal, and the ratio of the barb height to the groove depth in the insertion hole is 1:1.2-1.5.
[0019] Furthermore, a guide arc surface is provided at the entrance of the threading hole.
[0020] Furthermore, the cutting edge of the piercing structure is V-shaped and forked at an angle of 60°-90°.
[0021] Beneficial effects:
[0022] 1. The novel RAST structure of this utility model directly pierces the wire harness insulation layer through a V-shaped forked blade, eliminating the need for manual wire stripping, significantly improving assembly efficiency and reducing production costs. The plug-in structure between the housing and the PCB board simplifies the assembly process, adapts to semi-automatic / fully automated production lines, further shortens the production cycle, and the locking teeth engage with the grooves of the plug-in holes, ensuring smooth insertion and preventing accidental dislodgement, thus improving long-term reliability.
[0023] 2. The new RAST structure of this utility model utilizes a three-segment terminal synergy:
[0024] The piercing structure and optimized blade design (V-shaped fork) ensure low-impedance electrical connection with a contact resistance of less than 3mΩ.
[0025] The anti-reverse structure, with its barb and precise fit with the insertion hole groove, provides an anti-drop function and can withstand insertion and extraction forces of over 20N, making it suitable for vibration environments.
[0026] The elastic clips, through interference fit positioning protrusions, are precisely aligned with the PCB board contacts, and the clamping force ensures connection stability and avoids poor contact caused by displacement.
[0027] 3. The new RAST structure of this utility model supports multiple wire harness specifications such as AWG20-22 and is adapted to the 6A rated current requirement, meeting the diverse needs of different scenarios such as home appliances and automobiles. Attached Figure Description
[0028] Figure 1 This is an exploded structural diagram of a novel RAST structure according to an embodiment of this utility model;
[0029] Figure 2 This is a schematic diagram of the assembly structure of a new RAST structure according to an embodiment of the present invention;
[0030] Figure 3 This is a schematic diagram of the shell structure of a new RAST structure according to an embodiment of the present invention;
[0031] Figure 4 This is a schematic diagram of the connection terminal structure of a new RAST structure according to an embodiment of the present invention;
[0032] Figure 5 This is a schematic diagram of the connection terminal and wire harness structure of a new RAST structure according to an embodiment of the present invention;
[0033] Figure 6 This is a cross-sectional structural diagram of a novel RAST structure according to an embodiment of the present invention.
[0034] in:
[0035] 1. Housing; 11. Mounting slot; 12. Plug-in hole; 13. Wiring hole;
[0036] 2. PCB board;
[0037] 3. Connecting terminal; 31. Puncture structure; 32. Elastic clip; 33. Anti-reverse structure; 34. Locking tooth; 35. Positioning protrusion;
[0038] 4. Wiring harness.
[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0040] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.
[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0044] Reference Figures 1-6 An embodiment of the present invention provides a new structure for RAST, including a housing 1, a PCB board 2 and a connection terminal 3. The housing 1 has a mounting slot 11 on the front side, and the PCB board 2 is inserted into the mounting slot 11.
[0045] The mounting slot 11 is provided with a plurality of insertion holes 12 at equal intervals, and the connecting terminal 3 is fixed in the insertion holes 12 and connected to the PCB board 2.
[0046] The upper surface of the housing 1 is provided with a wire hole 13 that communicates with the insertion hole 12. The wire harness 4 passes through the wire hole 13 and is connected to the connection terminal 3.
[0047] The connecting terminal 3 includes a piercing structure 31 at the front, a backstop structure 33 in the middle, and an elastic clip 32 at the rear.
[0048] The two side walls of the piercing structure 31 are provided with locking teeth 34, and the inner wall of the insertion hole 12 is provided with a tooth groove that engages with the locking teeth 34.
[0049] The elastic clip 32 is provided with a positioning protrusion 35, and the PCB board 2 is provided with a positioning hole that is interference-fitted with the positioning protrusion 35.
[0050] In this embodiment, the front of the housing 1 is provided with a mounting slot 11, and a plurality of insertion holes 12 are evenly distributed in the slot for embedding the connecting terminal 3. The upper surface of the housing 1 is provided with a wire hole 13 communicating with the insertion hole 12, and the wire harness 4 is connected to the connecting terminal 3 through the wire hole 13.
[0051] The connecting terminal 3 is divided into three sections:
[0052] Piercing structure 31: Located at the front end, it is used to pierce the insulation sheath of the wire harness 4 to achieve electrical connection.
[0053] Anti-retraction structure 33: Located in the middle section, it engages with the slot in the insertion hole 12 to prevent the connection terminal 3 from falling off.
[0054] Elastic clip 32: Located at the rear, it clamps and fixes the PCB board 2 and is electrically connected to the circuit contacts.
[0055] The locking teeth 34 on both sides of the piercing structure 31 engage with the toothed grooves on the inner wall of the insertion hole 12, ensuring that the connecting terminal 3 is inserted in place; the positioning protrusion 35 on the elastic clip 32 is interference-fitted with the positioning hole of the PCB board 2 to prevent displacement. The insertion structure between the housing 1 and the PCB board 2 simplifies the assembly process and improves production efficiency. The engagement of the locking teeth 34 with the toothed grooves and the interference fit of the positioning protrusion 35 with the positioning hole ensure that the connecting terminal 3 is installed firmly and avoids loosening. The equally spaced insertion holes 12 support various wire harness 4 specifications to adapt to different application scenarios.
[0056] Optionally, the piercing structure 31 is used to pierce the insulating outer sheath of the wire harness 4 to achieve electrical connection, and the elastic clip 32 clamps and fixes the PCB board 2 and is electrically connected to the circuit contacts on the PCB board 2.
[0057] It should be noted that the cutting edge of the piercing structure 31 is designed with a V-shaped fork, with a fork angle of 60°-90°, directly piercing the insulation layer of the wire harness 4, exposing the conductor and making contact with the metal part of the connecting terminal 3. The elastic clip 32 presses the circuit contacts of the PCB board 2 with clamping force to form a low-impedance electrical connection. The V-shaped fork piercing structure 31 quickly completes the insulation layer peeling without additional tools, improving assembly efficiency. The clamping force of the elastic clip 32 ensures a tight contact between the PCB board 2 and the circuit contacts, reducing contact resistance and avoiding the risk of disconnection due to vibration or temperature changes.
[0058] Optionally, the anti-reverse structure 33 is a protrusion or a barb, and the insertion hole 12 is provided with a slot that engages with the anti-reverse structure 33.
[0059] It should be noted that the anti-retraction structure 33 is designed with symmetrically distributed barbs, and the ratio of the barb height to the depth of the groove inside the insertion hole 12 is 1:1.2-1.5. When the connecting terminal 3 is inserted into the insertion hole 12, the barbs engage with the groove, forming a mechanical lock. The cooperation between the barbs and the groove effectively prevents the connecting terminal 3 from falling off due to external force or vibration, improving connection reliability. The inclined design of the barbs causes the connecting terminal 3 to automatically retract when inserted, avoiding jamming and improving assembly smoothness.
[0060] Optionally, the locking tooth 34 is a unidirectional sawtooth structure, with its tilt direction facing the opposite side of the insertion direction of the connecting terminal 3.
[0061] It should be noted that the locking tooth 34 adopts a unidirectional sawtooth structure, with the tooth bevel at an angle of 45°-60° to the vertical direction, and the tilt direction facing the opposite side of the insertion direction of the connecting terminal 3. When the connecting terminal 3 is inserted into the insertion hole 12, the locking tooth 34 is guided and engaged by the tooth groove on the inner wall of the insertion hole 12. The unidirectional design of the locking tooth 34 ensures that the connecting terminal 3 can only move in the insertion direction, preventing it from falling off due to misoperation.
[0062] Optionally, the positioning protrusion 35 is a strip-shaped protrusion, and the size of the protrusion is larger than the diameter of the positioning hole of the PCB board 2.
[0063] It should be noted that the positioning protrusion 35 is a strip-shaped protrusion, and its size is slightly larger than the diameter of the positioning hole on the PCB board 2. When the connecting terminal 3 is inserted into the insertion hole 12, the positioning protrusion 35 is embedded in the positioning hole on the PCB board 2 through an interference fit to prevent misalignment. The interference fit ensures that the connecting terminal 3 and the positioning hole on the PCB board 2 are completely aligned, avoiding poor circuit contact caused by misalignment.
[0064] Optionally, the locking tooth 34 has a tooth height of 0.1-0.3 mm, and the tooth inclination surface has an angle of 45°-60° with the vertical direction.
[0065] It should be noted that the locking tooth 34 has a tooth height of 0.1-0.3mm, and the tooth bevel is inclined at a 45°-60° angle to the vertical direction. This design allows the locking tooth 34 to generate slight friction with the tooth groove on the inner wall of the insertion hole 12 during insertion, providing sufficient locking force.
[0066] Optionally, the positioning protrusion 35 is located inside the clamping end of the elastic clip 32.
[0067] It should be noted that the positioning protrusion 35 is located inside the clamping end of the elastic clip 32, and the clamping end clamps the circuit contacts of the PCB board 2 through elastic deformation. During the clamping process, the positioning protrusion 35 fits against the positioning hole of the PCB board 2 to prevent displacement.
[0068] Optionally, the anti-retraction structure 33 consists of barbs symmetrically distributed on both sides of the middle section of the connecting terminal 3, and the ratio of the barb height to the groove depth inside the insertion hole 12 is 1:1.2-1.5.
[0069] It should be noted that the ratio of the barb height to the depth of the slot inside the insertion hole 12 is 1:1.2-1.5. This ratio ensures that the barb provides sufficient locking force when inserted into the slot, without causing difficulty in insertion due to excessive depth.
[0070] Optionally, a guide arc surface is provided at the entrance of the threading hole 13.
[0071] It should be noted that a guide arc surface is provided at the entrance of the wire hole 13. When the wire harness 4 is inserted, the guide arc surface guides the wire harness 4 smoothly into the insertion hole 12, reducing friction. The guide arc surface reduces wear on the insulation layer of the wire harness 4, avoiding the risk of short circuits or open circuits caused by friction.
[0072] Optionally, the cutting edge of the piercing structure 31 is V-shaped and forked, with a forking angle of 60°-90°.
[0073] It should be noted that the cutting edge of the piercing structure 31 is V-shaped and forked at an angle of 60°-90°. This angle design ensures that the cutting edge distributes force evenly when piercing the insulation layer of the wire harness 4, avoiding localized stress concentration that could lead to tearing of the insulation layer. The V-shaped fork design allows for rapid stripping of the insulation layer, reducing operation time.
[0074] Description: During assembly, the PCB board 2 is inserted into the housing 1 through the mounting slot 11 on the front side. The insertion holes 12, which are evenly spaced within the slot, provide mounting positions for the connecting terminals 3. The wire harness 4 enters the housing 1 through the wire hole 13. The guide arc surface at the entrance of the wire hole 13 guides the wire harness 4 to pass through smoothly, reducing friction and damage to the insulation layer. The connecting terminal 3 consists of three sections working in tandem: the front section's piercing structure 31 pierces the insulation sheath of the wire harness 4 through a V-shaped forked blade, directly contacting the conductor to form a low-impedance electrical connection; the middle section's anti-retraction structure 33 engages with the slot in the insertion hole 12, providing an anti-drop function. Its height to slot depth ratio is 1:1.2-1.5, balancing insertion resistance and locking strength; the rear section's elastic clip 32 clamps and fixes the PCB board 2, and achieves precise positioning through the interference fit between the positioning protrusion 35 on the inner side of the clamping end and the positioning hole of the PCB board 2. The unidirectional sawtooth locking teeth 34 on both sides of the piercing structure 31 engage with the toothed grooves on the inner wall of the insertion hole 12, ensuring that the connecting terminal 3 is inserted in place and preventing accidental dislodgement. The tooth height is 0.1-0.3mm, and the tooth bevel is at a 45°-60° angle to the vertical direction, balancing insertion resistance and locking force. Simultaneously, the standardized insertion hole 12 layout of the housing 1 and PCB board 2, combined with the keyed design of the connecting terminal 3, prevents incorrect connection between the wire harness 4 and the terminal. Through IDC technology, the piercing structure 31 can quickly strip the insulation layer without manual wire stripping, and the clamping force of the elastic clip 32 ensures tight contact at the PCB board 2 contacts, reducing contact resistance.
[0075] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. A novel RAST structure, comprising a housing (1), a PCB board (2), and connecting terminals (3), characterized in that: The housing (1) has a mounting slot (11) on the front, and the PCB board (2) is inserted into the mounting slot (11); The mounting slot (11) is provided with several insertion holes (12) at equal intervals, and the connecting terminal (3) is fixed in the insertion hole (12) and connected to the PCB board (2); The upper surface of the housing (1) is provided with a wire hole (13) communicating with the insertion hole (12), and the wire harness (4) passes through the wire hole (13) and is connected to the connection terminal (3); The connecting terminal (3) includes a piercing structure (31) at the front, a backstop structure (33) in the middle, and an elastic clip (32) at the rear. The two side walls of the piercing structure (31) are provided with locking teeth (34), and the inner wall of the insertion hole (12) is provided with a tooth groove that engages with the locking teeth (34). The elastic clip (32) is provided with a positioning protrusion (35), and the PCB board (2) is provided with a positioning hole that is interference-fitted with the positioning protrusion (35).
2. The new structure of RAST according to claim 1, characterized in that, The piercing structure (31) is used to pierce the insulating outer sheath of the wire harness (4) to achieve electrical connection, and the elastic clip (32) clamps and fixes the PCB board (2) and is electrically connected to the circuit contacts on the PCB board (2).
3. The RAST of claim 1, wherein The anti-reverse structure (33) is a protrusion or a barb, and the insertion hole (12) is provided with a slot that engages with the anti-reverse structure (33).
4. The RAST of claim 1, wherein The locking tooth (34) is a unidirectional sawtooth structure, and its tilt direction is opposite to the insertion direction of the connecting terminal (3).
5. The RAST of claim 1, wherein The positioning protrusion (35) is a strip-shaped protrusion, and its size is larger than the diameter of the positioning hole of the PCB board (2).
6. The RAST of claim 4, wherein The locking tooth (34) has a tooth height of 0.1-0.3 mm and the tooth inclination surface is at an angle of 45°-60° to the vertical direction.
7. The RAST of claim 1, wherein The positioning protrusion (35) is located on the inner side of the clamping end of the elastic clip (32).
8. The new structure of RAST according to claim 1, characterized in that, The anti-reverse structure (33) consists of barbs symmetrically distributed on both sides of the middle section of the connecting terminal (3), and the ratio of the height of the barbs to the depth of the groove in the insertion hole (12) is 1:1.2-1.
5.
9. The novel RAST structure according to claim 1, characterized in that, The inlet of the threading hole (13) is provided with a guide arc surface.
10. The novel RAST structure according to claim 1, characterized in that, The cutting edge of the piercing structure (31) is V-shaped and forked, with a forking angle of 60°-90°.