Combined type bolt for car hub

Abstract

The invention discloses a combined type bolt for a car hub. The bolt comprises a lower bolt part and an upper bolt part; a connecting inner thread is arranged on the inner wall of the lower bolt part,a connecting outer thread is arranged on the upper bolt part, the upper bolt part and the lower bolt part are detachably connected, the lower bolt part is provided with a mounting nut, the upper boltpart comprises a screw, a connecting block, a fender and a hexagonal bolt head, the lower bolt part and the upper bolt part are detachably connected through cooperation of the connecting inner threadand the connecting outer thread, the lower bolt part can be independently used as a dual-head bolt to be used, a first guide polish rod segment smaller than the outer diameter of a lower bolt secondsegment is arranged below the lower bolt second segment, and the probability of thread wire sliding is reduced; due to the fender, rain water and mud are prevented from permeating into a screw hole along the bolt, and the service life of the bolt can be prolonged; through an inner hexagon bolt hole formed in the middle of the hexagon bolt head, the lower bolt part is provided with the mounting nut, and mounting and dismounting of the bolt are more labor-saving.

Description

【Technical field】 [0001] The invention relates to the technical field of hub bolts, in particular to a combined bolt for an automobile hub. 【Background technique】 [0002] Hub bolts are high-strength bolts that connect the wheels of the vehicle. The connection position is the hub unit bearing of the wheel. Generally, miniature vehicles use grade 10.9, and large and medium-sized vehicles use grade 12.9. The structure of hub bolts is generally knurled key gear, thread gear and a cap head, T-shaped head hub bolts Most of them are above grade 8.8, which are responsible for the large torque connection between the car hub and the axle. [0003] In order to meet the fastening requirements of different parts, there are more and more types and styles of hub bolts, but most of the bolts are of fixed length at present, and bolts of one specification and size can only be used for the connection of specific parts; and in the fastening During the operation process, if the vertical stren...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the fastening requirements of different parts, there are more and more types and styles of hub bolts, but most of the bolts are of fixed length at present, and bolts of one specification and size can only be used for the connection of specific parts; and in the fastening During the operation process, if the vertical force of the bolt and the threaded hole cannot be guaranteed, resulting in oblique force or the operator is inexperienced or uses too much force, it will cause the fragile threaded hole to slip

In addition, the outer hub bolts are installed behind the car wheels and exposed to the air for a long time, especially in the humid rainy season, they are often rusted and damaged. Rainwater will seep into the screw holes along the gap of the screw or bolt head, which will affect the service life of the bolts and increase maintenance and replacement. cost

The installation of the bolts basically requires a wrench. If there is no wrench, it is difficult to install and the installation is inconvenient.

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