Guiding pin with waterproof and positioning functions for automobile front cover lock
By designing a flange disc on the guide pin, waterproofing and positioning functions are achieved through contact with the guide hole. This solves the manufacturing difficulties in the existing technology, improves the reliability and production efficiency of the car hood lock, and reduces costs.
Patent Information
- Application Number
- CN202520467841.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Traditional car hood locks have guide pins that require precise matching for waterproofing and positioning, are difficult to manufacture, costly, and prone to wear, which affects system reliability and service life.
Design a guide pin with a flange disc. The flange disc contacts the guide hole to form a seal, achieving waterproof function. The fixed position of the disc provides positioning function, reducing the requirements for precision fit.
This design prevents water vapor from entering even with non-precision fit, avoiding damage to internal components due to moisture, thus improving the lifespan of the casing, increasing production efficiency, and reducing production costs.
Smart Images
Figure CN223937865U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of guide pins, and specifically relates to a guide pin with waterproof and positioning functions for car hood locks. Background Technology
[0002] Due to issues such as engine overheating, water vapor often accumulates inside the hood of a car. When it is necessary to open the hood, the electronic latch is usually activated by a power mechanism that drives a guide pin to reciprocate and open the hood.
[0003] In traditional automotive hood electronic latch designs, the guide pin typically uses a cylindrical straight rod structure. However, to prevent water vapor from entering and condensing, the guide pin and guide hole often require a very precise fit to avoid internal components getting damp or damaged. This high-precision fit requirement increases the difficulty of manufacturing and assembly, and also raises costs. Furthermore, the cylindrical straight rod design of the guide pin lacks effective positioning during reciprocating motion, making it prone to misalignment or wobbling. This not only affects the normal opening and closing of the latch but may also cause impact and wear between the guide pin and the plastic housing, ultimately damaging the plastic housing and reducing the system's reliability and lifespan.
[0004] Therefore, there is an urgent need to design a new type of guide pin to solve the above problems. Utility Model Content
[0005] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide a guide pin with waterproof and positioning functions for a car hood lock. The waterproof function is achieved by the natural sealing state formed when the flange disc contacts the guide hole, even when the guide pin and the guide hole are not perfectly matched. In addition, the fixed position of the disc also serves a positioning function, which greatly improves the service life of the housing. At the same time, the precision requirements of the product are greatly reduced, improving production efficiency and reducing production costs.
[0006] Technical Solution: To achieve the above objectives, this utility model provides a guide pin with waterproof and positioning functions for a car hood lock, comprising a guide pin body, one end of which is provided with a flange disc; the end face of the guide pin body near the flange disc is provided with a rounded corner; the end of the guide pin body away from the flange disc is provided with a connecting area; the connecting area is provided with a first chamfer; a connecting block is provided on the side of the first chamfer away from the flange disc; the end of the connecting block away from the flange disc is provided with a second chamfer; the diameter of the flange disc is greater than or equal to the diameter of the end face of the guide hole on which the guide pin body is installed; the guide pin body can reciprocate axially along the installed guide hole; when the guide pin body is not reciprocating axially, the flange disc just covers the end face of the guide hole on which the guide pin body is installed. The diameter of the flange disc is greater than or equal to the diameter of the guide hole end face, which can effectively cover the end face of the guide hole. When the guide pin is not making axial reciprocating motion, it can prevent water vapor and other substances from entering the guide hole, avoiding internal components from getting damp or damaged. It also provides stable support for the guide pin, preventing it from loosening or shifting due to external forces when stationary. At the same time, the design of the flange disc avoids impact and wear between the guide pin and the plastic housing when the guide pin is reciprocating to open the electronic lock of the car hood, greatly extending the service life of the plastic housing.
[0007] Furthermore, the diameter tolerance of the guide pin body rod can be relaxed to 0.03 mm. In cases of significant temperature variations or vibration, a larger tolerance range can reduce component jamming caused by thermal expansion and contraction or mechanical stress, thereby reducing the manufacturing cost of individual components and improving the adaptability of the mechanism.
[0008] Furthermore, the surface roughness of the guide pin body rod can be relaxed to Ra1.6μm. The Ra1.6μm surface roughness requirement is relatively easier to achieve in the machining process, without the need for additional high-precision machining equipment or complex post-processing, thereby reducing manufacturing costs.
[0009] Furthermore, the angle of the first chamfer is 19°. The 19° angle of the first chamfer effectively alleviates the deformation or cracking problems caused by stress concentration during the processing and use of the parts.
[0010] Furthermore, the diameter tolerance at the connection between the first chamfer and the second chamfer is 0.1 mm. This 0.1 mm tolerance range can be achieved through various common machining processes, such as turning and milling, making the choice of machining process for the parts more flexible and reducing the reliance on high-precision machining equipment.
[0011] Furthermore, the second chamfer has a width of 0.3 mm and an angle of 19°. The 19° angle and 0.3 mm width of the second chamfer provide good guidance for the assembly of the guide pin, making it easier to align and insert during the assembly process, reducing assembly difficulty and time.
[0012] Furthermore, the radius of the rounded corner is between 0.5mm and 0.9mm. This radius range of 0.5mm to 0.9mm effectively reduces the risk of stress concentration without significantly increasing the processing difficulty.
[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects:
[0014] 1. This utility model provides a waterproof and positioning guide pin for a car hood lock. The waterproof function is achieved by the natural sealing formed when the flange disc contacts the guide hole, even when the guide pin and the guide hole are not perfectly matched.
[0015] 2. This utility model provides a guide pin with waterproof and positioning functions for a car hood lock. The fixed position of the disc plays a positioning function, which greatly improves the service life of the housing.
[0016] 3. This utility model provides a guide pin with waterproof and positioning functions for car hood locks, which reduces the precision requirements of the product, improves production efficiency, and reduces production costs. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a guide pin with waterproof and positioning functions for a car hood lock according to the present invention.
[0018] Figure 2 This is a schematic diagram of the connecting area in a guide pin with waterproof and positioning functions for a car hood lock, as described in this utility model.
[0019] Figure 3 This is a schematic diagram illustrating the assembly and use of a guide pin with waterproof and positioning functions for a car hood lock, as described in this utility model.
[0020] In the picture:
[0021] 1-Guide pin body; 11-Rounded corner; 12-Connecting area;
[0022] 121 - First chamfer; 122 - Connecting block; 123 - Second chamfer;
[0023] 2-Flange disc. Detailed Implementation
[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Example
[0025] In this embodiment, as Figures 1 to 3 This utility model discloses a guide pin with waterproof and positioning functions for a car hood lock, including a guide pin body 1, a flange disc 2 at one end of the guide pin body 1; a rounded corner 11 at the end face of the guide pin body 1 near the flange disc 2; a connecting area 12 at the end of the guide pin body 1 away from the flange disc 2; a first chamfer 121 at the connecting area 12; a connecting block 122 at the side of the first chamfer 121 away from the flange disc 2; a second chamfer 123 at the end of the connecting block 122 away from the flange disc 2; the diameter of the flange disc 2 is greater than or equal to the diameter of the end face of the guide hole on which the guide pin body 1 is installed; the guide pin body 1 can reciprocate axially along the installed guide hole; when the guide pin body 1 is not reciprocating axially, the flange disc 2 just covers the end face of the guide hole on which the guide pin body 1 is installed.
[0026] Specifically, without the flange disc 2 design, the guide pin body 1 originally needed to be machined by a Swiss-type lathe and then precision ground; in this embodiment, due to the addition of the flange disc 2 design, the precision requirements of the guide pin body 1 are greatly reduced, and it can be adjusted to a cold heading process and then machined grooves, which greatly improves production efficiency, reduces production costs, and significantly improves the stability and reliability of the product.
[0027] In this embodiment, as Figure 1 The diameter tolerance of the guide pin body 1 rod can be relaxed to 0.03mm.
[0028] Specifically, in the absence of flange disc 2 in the design, the diameter tolerance of the guide pin body 1 rod is limited to 0.01mm.
[0029] In this embodiment, as Figure 1 The roughness of the guide pin body 1 rod portion can be relaxed to Ra1.6μm.
[0030] Specifically, in the absence of flange disc 2, the roughness of the guide pin body 1 rod is limited to Ra0.8μm.
[0031] In this embodiment, as Figure 1 and Figure 2 The angle of the first chamfer 121 is 19°.
[0032] Specifically, it can be precisely machined using a CNC machining center.
[0033] In this embodiment, as Figure 1 and Figure 2 The diameter tolerance at the connection between the first chamfer 121 and the second chamfer 123 is 0.1 mm.
[0034] Specifically, rough machining can be performed first, and then fine machining can be performed after the size is close to the target size, gradually approaching the final size.
[0035] In this embodiment, as Figure 1 and Figure 2 The width of the second chamfer 123 is 0.3mm and the angle is 19°.
[0036] Specifically, after processing, burrs need to be removed and the surface needs to be trimmed.
[0037] In this embodiment, as Figure 1 The radius of the arc of the fillet 11 is between 0.5 mm and 0.9 mm.
[0038] Specifically, ball end mills or fillet end mills are preferred for machining, and it is necessary to ensure that the tool radius is less than or equal to the required fillet radius.
[0039] The working principle of the above embodiments is as follows:
[0040] This utility model discloses a guide pin with waterproof and positioning functions for a car hood lock, applicable to scenarios such as... Figure 3 As shown, the guide pin body 1 passes through the guide hole of the housing, the connecting area 12 is connected to the external power mechanism, and can reciprocate along the axis under the drive of the external power mechanism;
[0041] When the car hood latch does not need to be opened, the flange disc 2 just covers the end face of the guide hole where the guide pin body 1 is installed, thus completing the fit and seal.
[0042] When the car hood latch needs to be opened, the external power mechanism drives the guide pin body 1 to make a reciprocating motion along the axial direction, which opens the car hood latch. The flange disc 2 plays a positioning and protection role when the guide pin body 1 is reset, reducing damage to the housing.
[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.
Claims
1. A guide pin for a car hood lock with waterproof and positioning functions, characterized in that: include: Guide pin body (1), one end of which is provided with flange disc (2); The guide pin body (1) has a rounded corner (11) on one end face near the flange disc (2); The guide pin body (1) has a connecting area (12) at one end away from the flange disc (2); the connecting area (12) has a first chamfer (121); the first chamfer (121) has a connecting block (122) on one side away from the flange disc (2); the connecting block (122) has a second chamfer (123) at one end away from the flange disc (2). The diameter of the flange disc (2) is greater than or equal to the diameter of the end face of the guide hole on which the guide pin body (1) is installed; the guide pin body (1) can reciprocate axially along the installed guide hole. When the guide pin body (1) is not axially reciprocating, the flange disc (2) just covers the end face of the guide hole on which the guide pin body (1) is installed.
2. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The diameter tolerance of the rod part of the guide pin body (1) can be relaxed to 0.03mm.
3. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The roughness of the rod portion of the guide pin body (1) can be relaxed to Ra1.6μm.
4. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The angle of the first chamfer (121) is 19°.
5. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The diameter tolerance at the connection between the first chamfer (121) and the second chamfer (123) is 0.1 mm.
6. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The width of the second chamfer (123) is 0.3 mm and the angle is 19°.
7. The guide pin with waterproof and positioning functions for a car hood lock according to claim 1, characterized in that: The radius of the arc of the fillet (11) is between 0.5 mm and 0.9 mm.