Suspension Parts

Advantages of PHC Shock Absorber

PHC shock absorber covers wide ranges, like almost 100 global car makers. Also, PHC has various types of shock absorbers. Around 7,000 parts no. can cover most cars, especially Korean, Japanese car brands. Technically, compared with other products, PHC shock absorber has excellent corrosion-resistance and oil durability by sealing type. As similar as OEM design, it has excellent damping force and durability using similar OE parts. PHC shock absorber provides comfort to drivers by optimizing the movement of the vehicle. PHC shock absorber ensures stable steering safety without skidding by adhering the wheel closely onto the ground.

Suspension System Classification

  • Suspension System Classification
  • Suspension System Classification

Front Suspension System

  • Front Suspension System
  • Front Suspension System

Rear Suspension System

  • Rear Suspension System
  • Rear Suspension System
  • Rear Suspension System
  • Rear Suspension System

Shock Absorber Structure & Type

  • Shock Absorber Structure

    • ① Generation of damping force
      : Piston & Body Valve
    • ② Storage of Oil & Gas(Air)
      : Cylinder & Reservoir Tube
    • ③ Transfer of movement for tire & vehicle chassis
      : Rod
    • ④ Prevention of internal gas & oil leak
      : Oil Seal

  • Shock Absorber Structure & Type

Shock Absorber Classification

  • Suspension Type
    • Suspension Type
      • Implements the damper function
      • Installs the spring partly to the suspension structure
      • Connects the suspension l ink
    • Suspension Type
      • Implements the damper function
      • Installs the bush for vibration insulation
  • Structure of Chamber
    • Structure of Chamber
      • Conventional basic type
      • Encapsulate the low-pressure gas
      • Composes the valves of tensile/compression separately
    • Structure of Chamber

Marking & Details on Shock Absorber

Marking & Details on Shock Absorber

Box Details

strut type - Box Details shock absorber type - Box Details

Label Details

Label Details

Troubleshooting

Judgement for oil leakage of the shock absorber

All the piston rods of shock absorbers form a very thin oil film, which helps the operation smoothly and extends the durability of oil seals. Due to this, it can be usually confused between such oil film and the oil leakage.

1. Strut type
Normal Oil Leakage
State
  • No need to change the strut
  • Need to change the strut
  • T3, T4 : Forms the oil on the S/Seat by oil film
  • T2 : Flows the oil
  • T1 : The oil is occurred on the entire surface
T4 T3 T2 T1
Picture 1. Strut type - Normal Picture 1. Strut type - Normal Picture 1. Strut type - Oil Leakage 1. Strut type - Oil Leakage
2. Shock Absorber Type
Normal Oil Leakage
State
  • No need to change the shock absorber
  • Need to change the shock absorber
  • T3, T4 : The oil is formed at the area of 1/3 × L on the base shell surface due to oil film.
    (L : length of base shell)
  • T2 : The oil is flowing
  • T1 : The oil is flowing on the surface of entire B/shell
T4 T3 T2 T1
Picture 2. Shock Absorber Type - Normal Picture 2. Shock Absorber Type - Normal Picture 2. Shock Absorber Type - Oil Leakage 2. Shock Absorber Type - Oil Leakage
3. Shock Absorber - Oil Film
3. Shock Absorber - Oil Film

Countermeasure of the Product

Technology improvement

Oil leakage improvement : Improvement of Sealing Types from Seam welding type to Caulking & Curling type

  • Before
    Before

    [Seam welding]

    • Putting in coolant while welding
    • Sealing defect occurs by too stiff seal derived from the heat from the welding
    • frequent oil leakage caused by dispersion
  • Defect
    Defect Defect
    • Oil Leakage on weld zone
    • Stuck in ROD by unbalanced
    • Plate Cap
  • After

    [Caulking type] [Curling type]

    After After
    • No use of coolant
    • Proeeding all process at room temperature
    • Efficient managing (few dispersion)

→ Improvement
Improvement of functioning and oil leakage due to defective welding
Noise reduction effect
Uniform quality on sealing part

Judgement for noise of shock absorber

  • As the suspension of the current vehicle is composed of many parts, besides the shock absorber, it is very difficult to find the part that becomes the source of noise.

    In the customer dissatisfaction items related with this, there are many cases that all the noise are not a component problem, and there is many cases that this is often due to the characteristics of the suspension system

    → According to this, it is the most of cases that the most of shock absorber claim products does not have the abnormality.

  • Judgement for noise of shock absorber