Vehicle safety belt locking claw

Abstract

The utility model discloses a vehicle safety belt locking claw which comprises a locking claw body and a pin shaft, and a pawl portion and an action portion are formed on the locking claw body. The locking claw body is an integral piece formed by die-casting iron-based powder metallurgy materials through the high-pressure die-casting technology, a pin shaft hole is formed in a pawl part of the locking claw body in a penetrating mode, and the lower end of the pin shaft is installed in the pin shaft hole of the pawl part in a pressing connection mode through the pressing connection technology. A guide arc surface for improving the moving stability of the locking claw body is arranged at the tail end of the action part, and a limiting surface for limiting the moving range of the locking claw body is formed on one side of the action part. The utility model has the advantages of low manufacturing cost, stable product molding size and high assembly precision.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seat belts, in particular to a locking claw applied to a locking mechanism of a vehicle seat belt, specifically a locking claw for a vehicle seat belt. Background Art

[0002] The locking claw is one of the key components in the locking mechanism of a vehicle seat belt. Most of the traditional locking claws are formed by machining metal materials. The locking claws formed by machining have low production efficiency, high processing cost, and unstable dimensions, so the assembly accuracy is limited. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a locking claw for a vehicle seat belt with a compact structure, low manufacturing cost, and stable product forming dimensions in view of the above-mentioned current situation of the prior art.

[0004] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0005] A locking claw for a vehicle seat belt includes a locking claw body and a pin shaft. The locking claw body is formed with a pawl portion and an operating portion integrally connected to the pawl portion; the locking claw body is an integral part formed by die-casting a ferrous powder metallurgy material by a high-pressure die-casting process. A pin shaft hole is formed through the pawl portion of the locking claw body, and the lower end of the pin shaft is press-fitted and installed in the pin shaft hole of the pawl portion by a press-fitting process. The tail end of the operating portion is provided with a guiding arc surface for improving the movement stability of the locking claw body, and a limiting surface for limiting the movement amplitude of the locking claw body is formed on one side of the operating portion.

[0006] To optimize the above technical solution, the measures taken further include:

[0007] The thickness of the above-mentioned pawl portion is higher than that of the operating portion.

[0008] A stepped hole cavity is formed by expanding the diameter of the lower hole of the above-mentioned pin shaft hole.

[0009] The outer surface of the above-mentioned locking claw body has a quenched layer with a carburizing depth greater than 0.3 mm.

[0010] The outer surface of the above-mentioned locking claw body has an anti-corrosion coating formed by a chromium-free dacromet process, and the color of the anti-corrosion coating is silver-gray.

[0011] Character code marks with a recessed depth of 0.2 mm for indicating the supplier code are stamped on the top surface of the above-mentioned pawl portion.

[0012] Compared with the prior art, the locking claw body of the present utility model is an integral part formed by die-casting with an iron-based powder metallurgy material using a high-pressure die-casting process. The locking claw body formed by iron-based powder has stable dimensions, low manufacturing costs, and high assembly accuracy. The locking claw body includes a pawl portion and an actuating portion. A pin hole is formed in the pawl portion, and the pin is press-fitted into the pin hole of the pawl portion by a press-fitting process. The tail end of the actuating portion is provided with a guiding arc surface, and a limiting surface is formed on one side of the actuating portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0014] Figure 2 is a sectional structural view of the present utility model;

[0015] Figure 3 is Figure 2 a top view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0017] Figures 1 to 3 is a structural schematic diagram of the present utility model.

[0018] The reference numerals therein are: locking claw body 1, pawl portion 11, pin hole 11a, stepped hole cavity 11b, actuating portion 12, guiding arc surface 12a, limiting surface 121, pin 2, character code mark 3.

[0019] As Figures 1 to 3 shown, the present utility model discloses a vehicle seat belt locking claw, which includes a locking claw body 1 and a pin 2. The locking claw body 1 is formed with a pawl portion 11 and an actuating portion 12 integrally connected to the pawl portion 11. From Figure 1 and Figure 3As can be seen, three engaging teeth are formed at the front end of the pawl portion 11. The engaging teeth are used to engage with the teeth on the inner circumferential surface of the ratchet wheel to limit the rotation of the ratchet wheel. The actuating portion 12 is used to cooperate with other force - adding components in the seat - belt locking mechanism to ensure that the entire locking pawl body 1 locks the ratchet wheel when moving forward or swinging forward, and unlocks from the ratchet wheel when moving backward or swinging backward. The locking pawl body 1 of the present utility model is an integral part formed by die - casting a ferrous - based powder metallurgy material using a high - pressure die - casting process. The locking pawl body 1 formed by the ferrous - based powder metallurgy material has a low manufacturing cost and high mechanical strength, especially good dimensional stability during product forming. A pin hole 11a is formed through the pawl portion 11 of the locking pawl body 1. The lower end of the pin 2 is press - fitted and installed in the pin hole 11a of the pawl portion 11. The pin 2 is made of 45# steel material. After the pin 2 is press - fitted with the locking pawl body 1, when an axial force of 100 N is applied to the pin 2, the pin 2 does not fall off or slide. A guiding arc surface 12a for improving the moving stability of the locking pawl body 1 is provided at the tail end of the actuating portion 12, and a limiting surface 121 for limiting the moving range of the locking pawl body 1 is formed on one side of the actuating portion 12.

[0020] In the embodiment, as Figure 2 shown, the thickness of the pawl portion 11 of the present utility model is higher than the thickness of the actuating portion 12. The thickness of the pawl portion 11 is 5.2 mm, and the thickness of the actuating portion 12 is 4 mm. The radius of the guiding arc surface 12a is 3.5 mm. The distance between the center of the pin hole 11a and the center of the circle where the guiding arc surface 12a is located is 9.6 mm.

[0021] In the embodiment, as Figure 2 shown, a stepped hole cavity 11b is formed by expanding the diameter of the lower hole of the pin hole 11a of the present utility model. The depth of the stepped hole cavity 11b is 0.5 mm, and the pin 2 shall not protrude from the stepped hole cavity 11b after being press - fitted.

[0022] The locking pawl body 1 of the present utility model also needs to be heat - treated after forming, and its surface has a quenched layer with a carburizing depth greater than 0.3 mm. The hardness after quenching is HRA55 - 65.

[0023] The quenched locking pawl body 1 also needs to be treated by a chromium - free dacromet process again, so that the outer surface of the locking pawl body 1 has an anti - corrosion coating to ensure the anti - corrosion performance of the locking pawl body 1 and improve the service life of the locking pawl. The color of the anti - corrosion coating is selected as silver - gray in the present utility model.

[0024] In the embodiment, a character code mark 3 with a recessed depth of 0.2 mm for indicating the supplier code is stamped on the top surface of the pawl portion 11 of the present utility model.

[0025] The best embodiment of the present utility model has been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present utility model.

Claims

1. A vehicle seat belt locking pawl, comprising a locking pawl body (1) and a pin shaft (2), wherein the locking pawl body (1) is formed with a ratchet pawl portion (11) and an operating portion (12) integrally connected to the ratchet pawl portion (11); characterized in that: The locking claw body (1) is an integral part formed by die-casting with an iron-based powder metallurgy material using a high-pressure die-casting process. A pin hole (11a) is formed through the pawl portion (11) of the locking claw body (1). The lower end of the pin (2) is press-fitted and installed in the pin hole (11a) of the pawl portion (11). A guiding arc surface (12a) for improving the movement stability of the locking claw body (1) is provided at the tail end of the actuating portion (12). A limiting surface (121) for defining the movement range of the locking claw body (1) is formed on one side of the actuating portion (12).

2. The vehicle seat belt locking pawl according to claim 1, characterized in that: The thickness of the pawl portion (11) is higher than that of the actuating portion (12).

3. The vehicle seat belt locking pawl according to claim 2, wherein: A stepped hole cavity (11b) is formed by expanding the diameter of the lower hole of the pin hole (11a).

4. The vehicle seat belt locking pawl according to claim 3, wherein: The outer surface of the locking claw body (1) has a quenched layer with a carburizing depth greater than 0.3 mm.

5. The vehicle seat belt locking pawl according to claim 4, wherein: The outer surface of the locking claw body (1) has an anti-corrosion coating formed by a chromium-free Dacromet process, and the color of the anti-corrosion coating is silver-gray.

6. The vehicle seat belt locking pawl according to claim 5, characterized in that: A character code mark (3) with a recessed depth of 0.2 mm for indicating the supplier code is punched on the top surface of the pawl portion (11).

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