How to choose grease for key parts of car seat
The car seat is one of the internal components of the car cockpit and has four basic functions: positioning, support, comfort and safety. The car seat system consists of seat cushion, backrest, side back support, head rest and so on. In addition to the function of riding, in the event of a traffic accident, it can maximize the role of protecting the occupants. The structure of the car seat seems simple, but to meet the requirements of matching with the vehicle, it requires a high technical content.
01 Car seat Angle adjuster and its grease
The car seat Angle adjuster is a device that realizes the folding motion of the back of the car seat. It is used in pairs on the seat and can be locked single-sided or double-sided. Car seat adjusters are divided into manual and automatic adjusters:
◇ Manual Angle adjuster is adjusted by the fixed and movable gear plate of the adjuster;
◇ The automatic Angle adjuster must be used in conjunction with the motor to realize the automatic adjustment of the seat back.
The car seat Angle adjuster is a device installed on the car seat to realize the adjustment of the seat back Angle. It is composed of a chair back connecting plate, a chair seat connecting plate, a core piece, a handwheel or an adjusting handle, a return spring and other parts. According to the working conditions of the car seat Angle regulator, high temperature baking process is required after grease injection, and the grease must be subjected to a baking temperature of about 180 ° C without dripping oil, otherwise the exosmotic grease will affect the lower coating process. Therefore, the grease is required to have excellent high temperature colloidal stability; In view of the case of dripping oil in the high-temperature baking process when the user uses the synthetic seat adjustable grease, special requirements of not more than 4.0% of the steel mesh oil separation of the products they use are put forward
02 Car seat height adjuster and its grease
At present, the car seat height manual adjustment mechanism is generally divided into two categories:
◇ Seat cushion height adjustment mechanism: mainly through the height adjuster to adjust the lift of the seat cushion to achieve the adjustment of seat height position;
◇ Overall height adjustment mechanism: mainly through the adjustment of the height of the cushion skeleton adjustment to achieve the adjustment of the seat height position.
Since the back of the car seat is connected to the bottom skeleton through the Angle adjuster, the rise and fall of the bottom skeleton is equivalent to the rise and fall of the entire car seat. The car seat height adjustment mechanism is mainly composed of a height adjuster, a bottom skeleton and a four-link mechanism. The core component is the height adjuster, and the core component of the height adjuster is the two-way overrunning clutch. The wedge Angle of the first stage two-way overrunning clutch can be larger, which is conducive to the transmission of torque; The second stage has the dual function of locking and driving, and the wedge Angle can be smaller. According to the working characteristics of the car seat adjuster, the grease used Base Oil have the characteristics of good damping, rust prevention, low temperature and long life.
As the most important part of the car seat assembly, the car seat slide rail not only has high technical content, but also is an important functional component, which belongs to one of the car safety components. The car seat slide rail with manual lock device can realize the manual adjustment of the car seat in the horizontal position; With the motor and the drive mechanism, the automatic adjustment of the car seat in the horizontal position can be realized, which plays the dual role of ensuring the ride comfort and guaranteeing the safety of passengers. In the safety performance indicators of the car seat, the car seat slide rail needs to withstand more than 24 kN of static tension, and to ensure that the slide rail under positive pressure and side pull and other forces in all directions, to balance the force, can not produce functional failure. This puts forward very high requirements for the design of the cross section shape of the slide rail and the raw material of the slide rail itself, and it is necessary to design the cross section of the slide rail scientifically and reasonably, especially the tensile strength of the raw material of the slide rail itself should reach more than 600 MPa.
Car seat motor as the power source of car electric seat, belongs to the configuration of middle and high-end passenger cars. Car seat motors are mainly permanent magnet direct-flow motors. Car seat motor according to the number of magnetic poles, can be divided into bipolar motor and multi-pole motor; According to the magnetic pole material, it can be divided into ferrite motor and rare earth motor. At present, the adjustment of the motor of the car seat is mainly based on manual adjustment of mechanical control and electric control. The motor of the car seat with the mechanical driving mechanism can adjust the level, height and tilt position of the car seat.
The selected grease should have low starting torque, running torque, excellent noise reduction effect, oxidation stability, rust resistance, corrosion resistance, moisture and heat resistance to water, low odor, high bearing capacity and low wear performance. It can not leak, drip or stain grease under high efficiency power conversion condition.
As automotive suppliers continue to improve the performance requirements of automotive seat motors, automotive seat motors require greater output power in a smaller volume state, and have better levels of anti-noise and anti-vibration quality. Some large foreign motor enterprises have long entered the automotive micromotor industry, and have accumulated a lot of and rich design experience. It can be inferred that the development trend of car seat motors in the future is to develop in the direction of small size, large output power, low noise, small vibration, easy installation and fast operation.
