What are the hazards of too large or too small free travel of the clutch pedal to the vehicle?

When the free stroke of the clutch pedal is too small or even disappears, the inner end of the release lever is in contact with the end face of the release bearing. This is equivalent to giving the pressure plate a separate external force, which is easy to make the clutch slip when working and cannot reliably transmit power;

At the same time, the wear of the driven disc, pressure plate and flywheel is exacerbated, and even ablation occurs in severe cases, and the wear of the release bearing and the release lever end is accelerated.

If the free stroke of the clutch pedal is too large, the disengagement stroke of the clutch will become smaller, resulting in incomplete clutch disengagement and the transmission.

Difficult gear shifting, while accelerating wear on the driven disc, pressure plate and flywheel, reducing clutch life.

The free stroke of the clutch of the car is too small, the clutch pressure plate is in a semi-disengaged state, and the clutch pedal is relaxed after the car starts, and the vehicle cannot walk. Even if you can walk, it will accelerate the wear. If the free stroke is too large, the separation is not complete, and it is easy to hit the transmission when entering the gear, and it is not easy to use the gearing.

Adjust what kind of car, first adjust the three adjustment screws of the clutch pressure plate, adjust to the seemingly connected non-connected, generally half a centimeter in the middle of the separation bearing, and the adjustment should be uniform. Then adjust the stroke of the clutch cylinder, and finally adjust the clutch master cylinder.

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The free stroke of the clutch pedal is too large, that is, the gap between the separation bearing and the diaphragm spring is too large, which will cause the separation to be incomplete, when the free stroke of the pedal is too small, the separation bearing sticks to the diaphragm spring and pushes the diaphragm spring, resulting in insufficient compression force, and the clutch slips to increase fuel consumption. Accelerates clutch wear. (Push diaphragm spring clutch).

If you can't hang the crotch, burn off the brake pads.

How to say it I'll tell you about the "Junction" with the height of the pedal The pedal is low and the clutch is good for the engagement, and the clutch is lifted after the gear is lifted to go, and it is not easy to have a gap, and the power is solid The pedal is high, and the clutch is easy to cut, and the gear is easy to hang, but it is easy to burn the clutch plate Personal opinion is for reference only Choose me, hehe.

In order to prevent the friction plate of the driven disc from wearing and thinning, it cannot move forward and cause the clutch to slip.

The clutch pedal is the control device of the clutch assembly of the manual transmission car, and it is the "human-machine" interaction part of the car and the driver. In learning to drive or in normal driving, it is one of the "five major control parts" of car driving, and the frequency of use is very high, for convenience, people directly call it "clutch". Whether it is operated correctly or not directly affects the starting, shifting and reversing of the car.

How the clutch works

The so-called clutch, as the name suggests, is to use "off" and "close" to transmit the right amount of power. The clutch is composed of friction plates, spring plates, pressure plates and power take-off shafts, which are arranged between the engine and the gearbox, and are used to transmit the torque stored on the engine flywheel to the transmission to ensure that the vehicle transmits the appropriate amount of driving force and torque to the driving wheels under different driving conditions, which belongs to the category of powertrain.

In the case of semi-linkage, the power input end of the clutch and the power output end are allowed to have a speed difference, that is, the appropriate amount of power is transmitted through its speed difference.

The free stroke of the clutch pedal is the result of the clearance between the release bearing and the release lever.

This clearance gradually decreases with the wear of the friction plate of the driven disc, if the clearance is too small or even there is no clearance, the separation bearing will wear out rapidly due to the constant contact with the separation lever, resulting in damage, and the clutch will have a "slip" fault during the bonding period; If the clearance is too large, the clutch will be inseparable, so the free stroke of the clutch pedal should be checked and adjusted regularly.

1. If there is no free stroke separation, the bearing has been damaged.

2. If there is no free stroke, the clutch slips after thermal expansion.

3. The wear and tear of the separation pressure jaw and clutch plate are intensified.

It's not the same.

The free stroke of the clutch refers to the clearance between the separated bearing and the diaphragm spring, (here I am talking mainly about the single driven disc diaphragm spring push clutch).

The free stroke of the pedal refers to the distance between the pedal when the pedal is pressed and the distance between the release bearing and the diaphragm spring, and there is a lever ratio of the pedal.

Clutch pedaling:

The mantra of the clutch stepping: the heel should land on the ground, first release quickly, stop for a few seconds, and then slow down, and the upper part of the center of the foot is placed on the pedal; Semi-linkage, not difficult to find, the vehicle is shaking, the engine is ringing, and the soles of the feet are pressed to the point; Lift the clutch, to be flexible, different cars are different; The clutch is high, it can be lifted quickly, and the clutch is low, and it must be lifted slowly; When stepping on the clutch, you need to remember to step on the end every time you shift gears.

The correct way to pedal the clutch is to use the left heel as the fulcrum and use the forefoot to press the clutch pedal. First of all, press the clutch to the end, hang into the corresponding gear, cooperate with a little throttle, and at the same time quickly lift the clutch to the semi-linkage position, and after feeling the clutch is stable, you can completely release the clutch.

Hehe, this concept is a bit vague, generally speaking, the pedal free stroke refers to the starting position to the position where the clutch begins to disengage.

Strictly speaking, the clutch stroke refers to the starting and ending stroke of the clutch fork or clutch ejector rod. , everyday words refer to the first type.

In order to eliminate the free clearance of the clutch and the elastic deformation of the parts of the control mechanism, the clutch pedal stroke required is called the clutch pedal free stroke. That is, the pedal distance from pressing the pedal to the clutch starting to contact and disengage is called free stroke, too large will lead to incomplete separation, too small will lead to increased wear.

Definition: To guarantee the clutch.

After normal wear and tear of the disc disc can still be fully engaged, leaving a gap between the release bearing and the release lever. The clutch pedal stroke required to eliminate this gap is called free travel.

2) Impact: The clutch is not completely separated due to excessive clearance, resulting in dragging, overheating of the clutch, and aggravation of wear; The gap is too small, causing the clutch to slip and the force transmission performance to decrease.

It is the gap between the clutch and the combination, the gap is too large and the separation is not complete, which will aggravate the wear of the clutch, and if the clutch is too small, the clutch will slip and the power will become weaker".

Purpose: The pedal free stroke is to preventBrake padsand the brake disc is too tight and overheats, causing the brake to fail while setting the function.

The free stroke is the brake pedal.

The distance at which the brakes don't work when you step on it. Without free travel, applying the brakes can be uncomfortable and may even cause the wheels to lock up on their own.

Adjustment: The free stroke of the pedal of the hydraulic brake is generally 15-20mm, and the adjustment should be adjusted according to the value specified by the model. The size of the free stroke of the brake pedal directly affects the braking time and braking distance.

Therefore, be sure to check whether the free stroke of the brake pedal is appropriate before leaving the car.

Clutch

When the clutch is disengaged, the pedal stroke that needs to be pressed to eliminate the free clearance of the clutch and the wear and deformation of the parts of the disengagement mechanism and the control mechanism is called the free stroke of the clutch pedal. The free travel of the clutch pedal is generally 1520mm.

When checking, use a ruler against the bottom plate of the cab, first measure the height of the pedal when it is completely relaxed, and then press the pedal lightly with your hand, and then measure the height of the pedal when you feel the resistance increases, and the height difference between the two measurements is the free stroke of the clutch pedal.

The free stroke of the clutch pedal is mainly used to prevent the clutch from slipping due to the fact that the outer end of the release lever cannot be moved back after the disc wears and thins. (After the driven disc is thinned, the lever is separated and moved back under the action of elastic force, so it has a certain free gap).

1) Clutch free clearance: a certain clearance between the inner end of the separation lever and the release bearing in the combined state of the clutch.

2) Clutch pedal free travel stroke: when the clutch pedal is pressed, all the free clearance of the clutch is eliminated, and the required distance is the stroke of the lap-resistant mu collapse pedal.

The distance from the floor to the pedal cushion surface measured with a ruler is called the pedal height, that is, a, and the standard value is, if it does not match, the pedal brake bolt should be adjusted, and the lock nut should be tightened after adjusting to the standard value.

If the clutch pedal does not have a free stroke, it will cause the clutch to slip and the car to run weakly; If the free travel of the clutch pedal is too large, the clutch bypass cannot be completely disengaged, which will cause difficulty in shifting gears. When checking, press the clutch pedal until resistance is felt.

Every time you disassemble and start the clutch hose, clutch hose, clutch master cylinder, or press the clutch pedal and feel soft and weak, you should deflate the clutch hydraulic system and fill the clutch oil, and do not use poor quality clutch oil.

It is very likely that it is caused by oil leakage from the sub-pump, or it may be caused by a broken master pump.

This may be the relative separation of the clutch in the whole process, and the stroke is constantly getting smaller, so it will lead to a pulse state that causes its separation to be not complete enough, and then makes it difficult for the transmission to shift gears.

This will cause a very high degree of wear on the individual parts and will cause the clutch to be disengaged incompletely.

What is the effect of the free stroke of the clutch pedal being too large or too small Suddenly it gets bigger, there is a broken master cylinder, a leaking oil from the sub-pump, and a broken clutch release bearing. If it is always large, it can be adjusted: 1. When the free stroke of the clutch pedal is too small or even disappears, the inner end of the separation lever is in contact with the end face of the separation bearing; 2. This is equivalent to a separate external force to the pressure plate, which is easy to make the clutch slip during work and cannot reliably transmit power; At the same time, the wear of the driven plate, pressure plate and flywheel is aggravated, and even ablation occurs in serious cases; In addition, it will accelerate the wear of the release bearing and the end of the release lever; 3. If the free stroke of the clutch pedal is too large, the separation stroke of the clutch will become smaller, resulting in incomplete clutch separation, making it difficult for the transmission to shift, and the wear of the driven disc, pressure plate and flywheel will be accelerated, and the service life of the clutch will be reduced by wild grinding.