CN104500552B - Pin structure for preventing hinge lining self-lubricating layer shedding - Google Patents

Abstract

The invention relates to a pin shaft structure for preventing the self-lubricating layer of the hinge bush from falling off, comprising a pin shaft body matched and connected with the bushing, a pin shaft head sheathed on the end of the pin shaft body, and the pin shaft head is connected with the pin shaft body The outer surface of the end adopts a combined structure composed of multiple arc-shaped R angles, and the adjacent R angles are connected through a slope with a certain slope. Compared with the prior art, when the bushing is pressed into the bushing, the present invention is a clearance fit at the beginning, and gradually begins to have an interference with the entry of the pin shaft. Because the head is treated with an excessive arc, the lubricating layer of the bushing is gradually squeezed, so the lubricating layer will not fall off, and the torque of the final hinge can be controlled within the tolerance range of the design.

Description

A pin shaft structure for preventing the self-lubricating layer of the hinge bush from coming off

technical field

The invention relates to a pin shaft structure, in particular to a pin shaft structure for preventing a hinge bush from falling off from a lubricating layer.

Background technique

Automobile hinges must use self-lubricating bushings. The structure of the bushing is generally to use a thin layer of PTFE lubricating layer on the base material, and then cooperate with the kingpin shaft to produce self-lubricating effect. There is a small interference fit relationship between the bush and the kingpin shaft, which not only needs to produce lubricated rotation, but also needs to produce a certain torque.

In the design requirements of the hinge, the lubricating layer of the bushing is a very important part, and it is required that it is not allowed to fall off and reduce in some places during the assembly process. However, in actual production, often in the process of assembling the pin shaft, the head of the pin shaft scrapes during the process of passing through the bushing, resulting in the shedding of the lubricating layer. Since the lubricating layer is reduced or falls off, the rotational torque of the hinge will drop and fail to meet the design requirements. This phenomenon has a certain probability of occurrence and is a risk. Although torque defective products can be found in the post-process torque inspection, it will cause scrapping and increase the cost of hinge manufacturing.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the prior art and to provide a kind of lubricating layer that only squeezes without scraping, ensures the integrity of the lubricating layer of the bushing, and the torque of the hinge can also meet the design requirements. The pin shaft structure prevents the self-lubricating layer of the hinge bush from falling off.

The purpose of the present invention can be achieved through the following technical solutions:

A pin shaft structure for preventing the hinge bush from falling off from the lubricating layer, comprising a pin shaft body mated with the bushing, and a pin shaft head sheathed on the end of the pin shaft body, and the pin shaft head is connected to the pin shaft body The outer surface of the end adopts a combined structure composed of multiple arc-shaped R angles, and the adjacent R angles are connected by a slope with a certain slope, so that when the pin passes through the bushing, it is gradually introduced through the connecting end. In this way, the lubricating layer can only be squeezed without scraping, which ensures the integrity of the lubricating layer of the bushing, and the torque of the hinge can also meet the design requirements.

As a preferred embodiment, the outer surface of the connecting end of the pin head and the pin body is a combined structure formed by two arc-shaped R angles.

As a more preferred embodiment, the two arc-shaped R angles are respectively located at the connection side of the pin head and the pin body and the transition section formed between the connection side and the upper and lower surfaces of the pin head. The slope angle of the slope formed between the two arc-shaped R angles is 150°-170°, and the best embodiment is 162°. The radius of the two arc-shaped R angles is 0.2mm-1.5mm.

In the manner described above, the inlet portion of the bushing at the head of the pin is first pressed into the bushing. At the beginning, it was a clearance fit, and gradually began to have an interference with the entry of the pin shaft. Because the head is treated with an excessive arc and has a slope of 162°, the lubricating layer of the bushing is gradually extruded, so the lubricating layer will not fall off. The torque of the final hinge can be controlled within the design tolerance range. In addition, there are special requirements for the inclination. If the inclination is less than 150°, there is a risk that the lubricating layer will fall off when the pin guides into the bushing. If it is higher than 170°, the matching dimension between the pin shaft and the liner section of the bushing will be reduced, which will affect the stability of the torque. sex.

Compared with the prior art, the present invention has the following advantages:

1. The cost has not increased: the pin shaft processing technology adopts the cold forging process as before;

Second, the assembly is more convenient. Efficiency improvement: the new structure of the pin shaft head makes it easier to introduce the bushing, lowers the requirement for the positioning coaxiality of the pin shaft positioning jig, and speeds up the press-in speed, ensuring quality and improving efficiency;

3. The qualified rate of torque of the hinge assembly is improved: the lubricating layer of the bushing is protected. Hinge torque is ensured.

Description of drawings

Fig. 1 is the partial structure schematic diagram of existing bearing pin;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is the partial structure schematic diagram of the present invention;

Fig. 4 is a schematic diagram of a partial structure of the present invention during assembly.

In the figure, 1 is the pin shaft body, 2 is the pin shaft head, 21 is an arc-shaped R angle, 3 is a bushing, 31 is a base material layer, and 32 is a PTFE lubricating layer.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

comparative example

The structure of existing pin shaft is shown in Figure 1, also is made up of pin shaft body and pin shaft head, but, generally speaking its head of existing pin shaft head is the structure of single R angle or natural R angle, like this When in use, the head of the pin shaft scrapes in the process of passing through the bushing, resulting in the shedding of the lubricating layer. Since the lubricating layer is reduced or falls off, the rotational torque of the hinge will drop and fail to meet the design requirements.

Example

A pin shaft structure to prevent the hinge bush from falling off from the lubricating layer. Its structure is shown in Figure 2-4. , the difference between the present invention and the prior art is that the outer surface of the connecting end of the pin head 2 and the pin body 1 adopts a combined structure composed of a plurality of arc-shaped R angles, and there is a gap between adjacent R angles. The slope transition connection with a certain slope, so that when the pin shaft passes through the bushing, it is gradually introduced through the connection end, which only squeezes the lubricating layer without scratching, ensuring the integrity of the lubricating layer of the bushing. The torque of the hinge can also meet the design requirements.

In this embodiment, the outer surface of the connecting end of the pin head 2 and the pin body 1 is a composite structure formed by two arc-shaped R angles 21 . The two arc-shaped R angles 21 are respectively located at the connecting side of the pin head 2 and the pin body 1 and the transition section formed between the connecting side and the upper and lower surfaces of the pin head. The slope angle of the slope formed between the two arc-shaped R angles 21 can be between 150°-170°, and in this embodiment, the slope is 162°. The radius of the two arc-shaped R corners can be controlled between 0.2mm-1.5mm. Through the above-mentioned method, the bush 3 is firstly pressed into the inlet portion of the bush at the head of the pin shaft, and the bush 3 is composed of a base material layer 31 and a PTFE lubricating layer 32 . At the beginning, it was a clearance fit, and gradually began to have an interference with the entry of the pin shaft. Because the head is processed in an excessive arc and has a slope of 162°, the PTFE lubricating layer 32 is gradually extruded, so the lubricating layer will not come off. The final hinge torque can be controlled within design tolerances.

Claims (6)

1. A pin shaft structure to prevent the hinge bush from falling off from the lubricating layer, comprising a pin shaft body mated with the bushing, and a pin shaft head sleeved at the end of the pin shaft body, characterized in that, The outer surface of the connecting end of the pin head and the pin body adopts a combined structure composed of a plurality of arc-shaped R angles, and the adjacent R angles are connected through a slope with a certain slope. 2. A pin structure for preventing the hinge bush from falling off from the lubricating layer according to claim 1, characterized in that, the outer surface of the connecting end of the pin head and the pin body is two arc-shaped R angles composed composite structure. 3. A pin structure for preventing the hinge bush from falling off from the lubricating layer according to claim 2, characterized in that the two arc-shaped R angles are respectively located on the connecting side of the pin head and the pin body and on the transition slope and the outer surface of the pin head. 4. A pin shaft structure for preventing the hinge bush from falling off from the lubricating layer according to claim 2, characterized in that the slope angle of the slope formed between the two arc-shaped R angles is 150°-170° °. 5. A pin shaft structure for preventing the hinge bush from falling off from the lubricating layer according to claim 4, characterized in that the included angle of the slope formed between the two arc-shaped R angles is 162°. 6. A pin shaft structure for preventing the hinge bush from falling off from the lubricating layer according to claim 2, wherein the radius of the two arc-shaped R angles is 0.2mm-1.5mm.