What problems can be caused by excessive wear of knuckle tips and bushings?

The kingpin of the steering knuckle of the aerial work platform is too tightly matched with the bushing or the lubrication is poor. When the axle is supported by a jack to lift the two front wheels off the ground, and then the steering wheel is rotated to feel brisk but feels heavy in actual driving, the fault is mostly on the steering knuckle kingpin and bushing or thrust bearing. The kingpin bushing or thrust bearing can be removed for cleaning, and then lubricated.

If damage is found, it should be replaced.

If the brake fails when the aerial work vehicle is going uphill, it should be reduced to medium and low gear in time to maintain sufficient power to drive up to the top of the slope and stop. If you need to park on a half-slope, you should keep the forward low gear, tighten the hand brake, and the personnel with the vehicle should use stones, skids and other objects to jam the wheels in time. If there is a backward slippage, the rear of the car should face the hillside or the safety side, and the headlights and emergency lights should be turned on to attract the attention of the vehicles in front and behind.

The aerial work platform uses the bumper, carriage and other rigid parts of the vehicle to rub and collide with natural obstacles (rocks, trees or soil slopes) on the side of the road to achieve the purpose of forcibly stopping and getting out of danger and reducing accident losses as much as possible.

The kingpin hole of the front axle is often squeezed laterally by the kingpin, resulting in a flare and oval shape, with the largest upper and lower mouths and a small middle. If the kingpin hole is worn, when the matching clearance exceeds the limit value, it can be repaired by the repair size method. When the bore wear has not yet reached or exceeded the last level of repair size, the hole can be enlarged by the repair size method, and the kingpin of the increased size is replaced.

When repairing the front axle kingpin hole according to the repair size, in addition to selecting the kingpin of the increased size, also need to repair the size of the same level and process the kingpin bushing of the steering knuckle and select the appropriate thrust bearing. If the kingpin hole is worn too much and exceeds the size of the last level repair, it can be repaired with a sleeve. After the bushing is inserted, the hole is reamed and the standard size kingpin is assembled.

The method of bushing wear: jack up the front axle with a jack, hold the front wheel up and down with both hands or push and pull the wheel to shake, that is, to determine the gap by feeling, and can also be accurately measured with a dial gauge. If the inspection determines that the gap between the kingpin and the bushing is too large, the kingpin and bushing must be removed.

Because the middle part of the kingpin and the front axle are easy to corrode, disassembly is often very difficult, because of the limitation of the fender, it is quite laborious to knock it out, it can be taken to remove the I-beam (or fender) and then beat it out, and it can also be disassembled by making a special press; After being soaked with washing and gasoline, it is squeezed out with a jack, and it can also be beaten out after local heating by gas welding. To remove the bushing, a copper rod slightly smaller than the outer diameter of the bushing can be used to hammer it out by hand or press it out. After replacing the new bushing, it should be reamed according to its repair size.

When installing the bushing, the bushing should be clamped into the steering knuckle hole with pressure or vise, and avoid directly hitting it with a hammer to prevent deformation. The two ends of the rear bushing should not be higher than the end face of the steering knuckle. When pressing, it should be noted that the oil hole must be aligned with the grease nozzle of the kingpin seat hole on the steering knuckle for oil injection.

After the liner is ready, the liner is bored, and the inner diameter of the bushing is turned according to the size of the kingpin it mated, so as to achieve the appropriate fitting clearance between the two. Conditional units can be processed by machine tools, and general vehicles can be used for manual reaming with adjustable reamers. The blade should be sharp, and one knife should be hinged with two holes to ensure that the two bushings are concentric.

Pull the reamer clockwise, balance it vigorously, check the mating clearance with the kingpin frequently, and gradually enlarge the size of the reamer to avoid out-of-tolerance.

Firstly, the bushing needs to be replaced frequently, and secondly, it may be a problem inside the car, and it is recommended to overhaul.

It may cause potential safety hazards, so it should be repaired in time.

If the wear is too large, it may not be possible to drive normally.

Excessive damage may cause heat and other problems that affect the normal operation of the car.

There may be safety hazards while driving.

The front wheels have a large free space in the low-speed turn and steering wheel.

It will cause tire aging and affect driving safety.

It may cause a series of problems and should be repaired in time.

It may cause hidden dangers, and it must be repaired in time.

Cause low-speed swing, remember to overhaul in time.

The gap between the bushings is larger, and the sound may be louder.

The bushing is very worn, and the garbage may be easier to get into, and the shaft is easy to lock.

The steering knuckle is subjected to varying shock loads, so common faults are the steering knuckle, root breakage, kingpin and bushing wear, and knuckle journal and oil seal neck wear. Attention should be paid to inspection during maintenance.

Ways to check for knuckle breakage:

When conditions permit, electromagnetic flaw detectors can be used, and oil immersion percussion methods can also be used. Be careful when inspecting because most fractures grow from tiny cracks to breaks. Once cracks are found, they should be replaced or repaired in time (machining after slotting surfacing welding, restore the original size, and heat treatment if necessary), the journal and kingpin can be measured with microcard, when the matching gap between the journal and the bearing is greater than two.

Second, the oil seal neck is worn out.

The steering knuckle, also known as the "sheep's horn", is one of the important parts in the steering axle of the car, which can make the car drive steadily and transmit the driving direction sensitively.

The function of the steering knuckle is to transmit and bear the front load of the car, support and drive the front wheel to rotate around the kingpin to steer the car. When the car is in motion, it is subjected to variable impact loads, so it is required to have high strength.

The reason for the excessive free stroke of the steering wheel is the general reflection of the clearance of the various components of the entire steering system, and the reasons for the excessive free travel of the steering wheel are mainly in the following aspects:

The clearance of the upper and lower radial thrust bearings of the steering worm (screw) is too large.

The steering gear main drive pair is worn excessively.

The adjustment of the main transmission pair of the steering gear is not timely or improperly adjusted.

The steering arm is too loose to fit the steering arm shaft or the clearance is too large.

The clearance between the steering shaft and the bushing fit is too large.

The universal transmission bearing of the steering system is worn and the spline transmission clearance is too large.

The gap between the ball pin and the seat of the transverse and straight tie rod increases after wear, or the compensating spring is broken.

The clearance between the kingpin and the knuckle bushing is too large, and the front hub bearing clearance is too large.

The steering arm set screw is loose.

The ball pin fits loosely with the steering arm taper hole or the lock nut is loose.

Hello friend, it has little impact on the car, but it will seriously affect personal safety!

There are three situations that will occur when the steering gear of the car is broken:

1. There will be abnormal sound when playing the steering wheel in situ, whether it is in situ or when the speed does not exceed 20 kilometers per hour;

2. The turning steering wheel is very loose or the steering wheel is very heavy and very difficult.

3. The typical power booster pump failure leads to difficulty in direction rotation, and the direction of rotation will be abnormally heavy during driving.

At present, the steering system configured on the car can be roughly divided into mechanical steering, mechanical hydraulic power steering system, electro-hydraulic power steering system and electric power steering system.

Most of the new models are equipped with electro-hydraulic or electric power assist systems, while mechanical steering gears have been phased out.

Maintenance precautions for mechanical steering machines:

1. When driving on potholes and uneven roads, slow down and slow down to reduce the load on the steering machine.

2. Always check the protective sleeves on both sides of the steering machine and the protective sleeves connected to the universal cross shaft on the upper part of the steering machine. Breakage of the sheath is the most important factor that causes early wear and damage to the steering machine.

After the sheath is damaged, water, dust and sand will enter the inside of the steering machine through the damaged place, destroying the grease oil film of the rack and pinion, resulting in rust and abnormal wear inside the steering machine.

3. Due to the use of grease, it will gradually become dirty and deteriorate, so that the lubrication capacity will decrease; At the same time, the material under wear will gradually increase, and the abrasive wear phenomenon will become heavier and heavier, which will aggravate the wear of the steering machine.

4. The use conditions of the steering machine are harsh and the load is large, so special grease must be used.

5. The clearance of the steering machine will gradually increase in use, if the clearance of the steering wheel is too large, the steering machine must be checked, if the rack and pinion are abnormally worn and serious, the steering machine assembly must be replaced.

6. Do not carry out the maintenance and maintenance of the steering machine in the roadside shop with poor equipment and low technical level. If the steering machine is not adjusted properly, it will cause jamming, endangering driving and personal safety.

First of all, it depends on what kind of power you have, generally hydraulic power and electronic power.

If the steering machine is broken, it may be difficult to steer, the steering power is invalid (that is, there is no power assist, and the steering is too heavy when steering), the steering machine is stuck and cannot be steered (the direction cannot be turned directly, and it is stuck), and the indirect will also lead to abnormal tire wear.

If the steering machine is broken, it must be repaired, it is best to repair it, and it is best to replace the assembly parts directly if it cannot be repaired, it is best to replace the original parts, which is guaranteed, this thing directly affects driving safety, can not be ambiguous, and something will happen.

If you hit the direction of sinking, don't move and you will get into a car accident.

In general, it is caused by uneven wear of the front tires, uneven use of newly repaired tires or pads, and deformation of the steel rim. Because, when the wheel speed is fast, the torque that drives the steering wheel to rotate mainly comes from the deflection of the tire or steel rim. When the sway difference of the tire or steel rim exceeds 3 mm, the yaw torque can drive the steering wheel to swing left and right.

The center of gravity of the heavy vehicle is unstable under braking, so the swing amplitude is more severe.

The oil leakage of the automobile steering machine is that the oil seal in the cavity is aged or damaged, resulting in poor sealing and leakage of steering fluid.

1. The oil leakage of the steering machine is nothing more than several positions: the upper cover of the steering machine, the side end cover and the joint of the steering shaft arm. These three parts have sealing rings, which can be solved by replacing them with new oil seals and sealing rings.

2. If there is oil leakage in other parts, it is likely to be trachoma or cracks in the steering casing. Small cracks and trachoma can be plugged with Loctite 290 High Permeability Sealant.

3. If the oil leaks when the gasket is changed and the sealant is still leaking, the steering machine assembly needs to be replaced.

In addition, don't often hit the direction too hard when driving, and at the same time try not to hit the wheel in situ as much as possible, often this will cause the oil seal to be flushed, resulting in damage to the steering gear and oil leakage.

There are the following reasons:

Electronic Assist System:

1. Lack of oil, the system has air. If the booster system is short of oil, causing air in the system, not only is the steering heavy, but there is also noise during steering. At this time, it is enough to exhaust according to the refueling and deflation procedures.

2. Steering machine failure, generally speaking, most of the steering machine failure is due to the piston and cylinder strain, or the piston upper sealing ring is damaged, resulting in the piston two chambers being connected, so that the booster pressure can not be effectively established. In addition, the damage of various sealing rings on the circumferential surface of the piston and the sealing ring on the steering screw will also cause high-pressure unloading and reduce the power assist pressure to the bottom.

Hydraulic power assist system:

1. When the booster pump fails, and the pump pressure of the booster pump does not reach the standard value, the direction is heavy.

2. The oil return filter in the oil storage tank is blocked. The oil return filter in the oil storage tank is not maintained and replaced for a long time, resulting in blockage, poor circulation of booster oil, and increased back pressure of oil return, which will also make the direction heavy.

The common faults of the steering machine are as follows:

1. Failure of the booster pump.

2. Steering machine failure.

3. Lack of oil, the system has air.

4. The oil return filter in the oil storage tank is blocked.

5. The sealing rings of the two limit valves fail, so that the two chambers of the piston are connected, resulting in the failure of the booster. If the steering machine fails, it will have a very serious impact on safety, which is one of the fundamental safety failures.

Oil contamination is the most important problem! @

Zhengzhou Jutai Auto Parts (cage steering machine) company provides you with.