The idea of ​​clutch electric control pneumatic control mechanism

The operating mechanism of the clutch of the clutch electronically controlled pneumatic operating mechanism is a sleeve mechanism by which the driver separates the clutch and softly engages it. It starts from the clutch pedal and terminates in the clutch housing. The operating mechanism is divided into a manual pneumatic type and a power type. The human type uses the force that the driver acts on the pedal as the only source of energy. Pneumatic and dynamic are engine-driven air compressors or other forms of energy as the primary source of energy, and the driver's power is only used as an auxiliary or backup source of energy. In medium or heavy-duty vehicles, the clutch compression spring force is very large, in order to reduce the required pedal effort, and not to increase the pedal stroke due to the transmission lever ratio is too large, often in the manual 1 assistive operating mechanism in the medium or The power steering mechanisms commonly used in heavy-duty vehicles are spring-loaded and pneumatic.

Ii Air-assisted operating mechanism The air-assisted clutch operating mechanism uses the air compressor driven by the engine as the main operating energy, and the driver's body acts as an auxiliary and backup operating energy source. The air pressure boosting device may be installed in a mechanical operating mechanism, that is, a pneumatic power mechanical operating mechanism, or may be installed in a hydraulic operating mechanism, that is, a pneumatic power hydraulic operating mechanism. For example, the liquid-type steering mechanism structure that Dongfeng Motor Co., Ltd. is producing at the printing 180 is sufficient.

1.2 Structural Features The characteristics of the pneumatic assist clutch operating mechanism are as follows: 3. The cost is relatively high, and the price of the oil pump main pump pipeline sub-pump used in the control pipeline is much higher than that of the fully mechanical self-made parts and the author will be behind. The price of the electric switch and the electromagnetic relay used in the electronically controlled pneumatics introduced; 1. The operation is relatively soft, because the differential pump adopts the differential structure, which makes the movement of the disconnector softer and more convenient than the mechanical type. Steel pipes and hoses, compared with the fully conceived Wen Leiqiong Hong Zhangkui mechanical type, can be appropriately bent according to the needs during the arrangement; 1. In order to ensure the turning of the cab, the hydraulic transmission pipe must be soft at the turning position. Tube, but if the hose is too long, the transmission efficiency will be reduced, and the clutch clutch will not be in place; there is still a difficulty in using this control method, that is, the air in the hydraulic pipeline is more troublesome, and the car is the opposite. The first trial of 41. Adopting the traditional hydraulically controlled pneumatic operation mode, the hydraulic transmission adopts a steel pipe with a diameter of 5, and the phenomenon that the clutch returns poorly occurs. Therefore, we switched to a steel pipe with a diameter of 8. After the change, the phenomenon disappeared, but it took nearly 4 hours to remove the gas inside the tube. 1. There should not be too much bending when using this method, otherwise there will be cases where the air cannot be discharged and the transmission efficiency is too low.

2 The electronically controlled pneumatic operating mechanism takes into account the action of the manual clutch operating mechanism and the vertical clutch of the assisting type operating mechanism.

In the process of driving. The trunnion bearing is subjected to less and less impact strength and frequency. Rolling bearings that are relatively inferior to load bearing and impact are more suitable for use at the trunnion; yes, compared with the sliding bearing, the clearance of the trunnion bearing is increased due to the use of the rolling bearing, and the rolling bearing is adjusted in time and adjusted to contain the heavy load. The increase of impact damage prolongs the life; on the contrary, the sliding bearing can not reduce the gap because the new bearing is not replaced, and the gap cannot be adjusted in time after the increase, which aggravates the heavy load impact damage and shortens the life.

The strand 1 to the land is increased to the above, even after the price of the bearing wears through, the trunnion seat hole and the trunnion are lost, and then the trunnion welder round trunnion is used to rework the new plain bearing. The method restores the bearing clearance.

Based on this, the author suggests that most of the trunnion bearings of the double rear axle heavy-duty vehicles are designed as rolling bearings. This is to meet the needs of the working conditions, is to reduce the number of users to repair the trunnion and the car day, and improve the economic benefits.

The rear axle heavy-duty vehicle trunnion is commonly known as the middle axle assembly bearing. There are two types of plain bearings and rolling bearings. Most of the double-back axle heavy-duty trunnion bearings at home and abroad use sliding bearings, and only a few of them use rolling bearings for Mercedes-Benz cars. The reason is that according to the classical theory and the rolling bearing, the bearing capacity and impact resistance of the sliding bearing are stronger, and the working condition at the trunnion is that the bearing load is strong; but the disadvantage is that the gap should not be adjusted.

It has been proved that the rolling bearing used at the trunnion has a longer life than the sliding bearing. According to our experience, rolling bearings are used at the trunnion, if the relevant accessories are of good quality. The gap is properly maintained and fully lubricated, and it can basically be repaired for life. However, if a sliding bearing is used at the trunnion, it will need to be overhauled for 100,000 kilometers. After each overhaul, it needs to be overhauled every 100,000 kilometers.

As a national transportation enterprise of Henan Oilfield professional transportation unit, we have more than 100 double rear axle heavy-duty vehicles imported and domestically produced by more than ten brands. The reason why we find the rolling bearing at the trunnion in use is that the road conditions in recent years are getting better and better, and the basic structural principle of the electronically controlled pneumatic operating mechanism of the structural principle of the heavy-duty drilling vehicle. The clutch operating mechanism is composed of a power switch 1 wire 2 clutch booster 4 nylon intake pipe 5 separation fork arm assembly 6 and a power supply 8 and the like. In order to increase the softness of the clutch release, a root damping spring is added at the clutch push rod. 7. Due to the different habits and convenience of the operation, the power switch 1 can first be controlled by the clutch pedal 9, which is to increase the sense of the foot. The root return spring is added at the pedal assembly; secondly, the power switch 1 can also be placed on the transmission shift lever, so that the clutch and shift are operated by the handle, so that the coordination of the shift clutch can be achieved. To. At the same time, the brake pedal and the accelerator pedal can be divided into two sides of the steering machine, which are respectively operated by the left and right feet, which is convenient for arrangement and prevents the two functions from being completely opposite. If necessary, the power switch 1 can also be placed. On the instrument panel or elsewhere.

12 Working Process The working process of the electronically controlled pneumatic operating mechanism is as follows: When the clutch is required to be disengaged, the pedal 9 is depressed, the contact switch is turned on, the electromagnetic relay 3 is started to operate, and under the control of the electromagnetic relay 3, the clutch booster The air valve of 4 is opened, and the high-pressure gas from the air intake port enters the clutch booster bucket through the nylon air intake pipe 5. The piston of the booster booster overcomes the spring in the booster, pushes the push rod movement, drives the split rocker arm to swing, and pushes the release bearing. Axial movement for the purpose of clutch separation.

2.3 Structural Features The main features of this kind of operating mechanism are lower than the above two methods, especially compared with the liquid-controlled pneumatic. The structure is simple and has great advantages in layout. The control part adopts electric wires, and can be arranged to be bent at will. The bending of the electric wires can be arbitrarily bent, and the characteristics are favorable for the sealing and dustproof work of the cab; the transmission efficiency is high, neither by friction or The factors such as the leverage ratio are inflexible, and there is no such phenomenon that the transmission efficiency is low due to the expansion of the liquid compressible hose or the incorporation of air; 6. The development cost is not high due to the small change to the booster. At the same time, it can make the clutch work softly; 1. It is convenient to find the control line when it asks, and only need to use universal to test whether the line is unblocked. The previous hydraulic control is more troublesome. For example, when there is no pressure on the pedal, it is necessary to disassemble the hydraulic pipe section; 8. The oil storage cylinder and the booster master pump are eliminated, and the design layout and process are simplified.

3 Summary The use of electronically controlled pneumatic clutch operating mechanism provides designers with a new theory of great benefits for the transmission system or the body vehicle, and is the development trend of heavy-duty vehicle clutch operating mechanism.

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