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The sales volume of Valin's heavy trucks and dark horses is steadily rising, and the products are constantly praised by users. At the time of Valin Motors 2006 Business Meeting, Chairman Liu Hanru personally arranged a test run. The test drive reporter selected a concrete mixer (AH5253GJB concrete mixer) equipped with a 345 hp engine from Dongfeng Cummins as a test drive in the snow. Xu Hongyin, an engineer of Valin Technical Service Department, and Li Junmin, a service engineer of Dongfeng Cummins Engine Co., Ltd. provided explanations for the entire trial process.
The appearance of Hualing heavy trucks, which are mainly in white and blue, has a strong Japanese car style. The lines are simple and clear, and it is definitely not vulgar. The coating effect has reached the level of domestic family cars. Three green front lamps are installed on the upper side of the windshield. According to Xu Hongyin's introduction, the circuits of the three front-head lamps are complexly connected with the circuit of the electronic induction speedometer when the speed is 0km/h-40km/h. At 1 hour, the front dome light is on; when the vehicle speed is between 40km/h and 60km/h, the front dome light is on 2 lights; when the vehicle speed exceeds 60km/h, the top of 3 feet is fully illuminated. By turning on the number of lights, the vehicle speed can be clearly indicated to the other vehicle, allowing the other driver to respond in advance, greatly improving the safety of the vehicle. The handles are arranged on both sides of the front top light, which facilitates the driver to stand on the bumper and scrub the front windshield and the maintenance personnel perform operations such as disassembling the rearview mirror. The main driving side mirror adopts a bracket type near the body (the bracket is fixed on the door), which is convenient for the driver to adjust the angle of the mirror; the side mirror of the co-driver adopts a very practical far body bracket type and is equipped with a long distance. Mirrors, close-up rear-view mirrors, and front-end mirrors are equipped with stabilizer bars on the upper and lower ends of the bracket. The layout of this rear-view mirror allows the driver to clearly and effectively observe the real-time conditions on the right side of the vehicle, even if The occupant's body leaning forward does not affect the driver's line of sight. The wiper uses three rocker arms, effectively increasing the visibility of rain and snow. The armrests are also arranged on both sides of the swaying arm of the wiper to facilitate maintenance and cleaning. The area of ​​the front face is relatively large and can be turned upside down. The front face is marked with "CAMC" and Valin's logo, which has a strong sense of national self-owned brand. The lower part of the front face has a large tuyere, which is beneficial to the heat dissipation of the engine and other parts. The lighting of the whole body is both beautiful and reasonable. The integrated headlight is embedded in a luxurious bumper, the low beam lamp is a xenon headlight, the high beam lamp is a vacuum lamp type, and the most extreme side turn signal and sign light are tightly attached. In the headlights, there are fog lights in the lower part of the bumper, and turn lights are also placed on both sides of the door. The two levels of the upper and lower pedals on both sides of the cab are compared with some impractical three-step pedals, which not only saves costs but also suits the Chinese people's physical characteristics. At the bottom of the cab, a heat-insulating sandwich was used to drive the ride comfortably. The cab lifting mechanism combined with the electrohydraulic flipping and manual hydraulic flipping is more advanced in the heavy truck, reducing the driver's physical strength.
The three-dimensional arc-shaped cab interior design increases the height and width of the interior, ensuring ample front-row driving space. In addition, the increased front windshield area further expands the driving horizon. Although the interior is not the most luxurious, it has good workmanship and material. It is commendable that the operating components and the air outlet are arranged very reasonable, close to the driver and simple and convenient, without any bloated facilities, and does not affect the driver's operation at high speed. Power windows and central control locks raised the cab by a notch. The combination meter of Hualing heavy truck is the most closely related to the passenger car instrument in domestic heavy trucks. Two equal-diameter speed meters and engine tachometers are juxtaposed on both sides. The scale is white and the pointer is red, which is more readable.
From the test drive configuration point of view, Hualing heavy truck has Europe and the United States style. The 345ps Dongfeng Cummins L345-20 diesel engine has a bore diameter of 114mm, a stroke length of 145mm, a displacement of only 8.9L and a self-respecting weight of only 650kg. Bosch fuel injection pumps have a maximum speed of 2500rpm and a maximum engine torque of 1350N.m at 1400rpm. The gearbox adopts 9 stalls (1 reverse gear, 1 climbing gear, 8 normal forward gears) box of Shaanxi Fast 11509C Fuller to achieve a perfect torque output. Hualing heavy-duty fish-abdominal girder has superior bearing capacity and reasonable load distribution. Before this, only the North Mercedes-Benz adopted this form in the country. The rear axle is a FAW 457 single-dash speed-reduction welding bridge, which is also sufficient to deal with various road conditions for concrete mixers with a total mass of only 24,995 kg. A reaction bar is connected between the bridge and the crossbeam to effectively protect the axle, tires and frame during sharp bends. The brake cylinder is placed above the final drive, which improves the overall vehicle's passing performance. However, many heavy trucks now use the V-type counter-bar setting, which is better than one.
The field test route starts from the exhibition site and then enters various roads around the Hualing factory area. After the reporter started the Cummins engine, the idle speed was very stable, and it stabilized at around 700rmp from the very beginning. When idling, it is obvious that the engine vibration is extremely small and there is no noise. The curb weight of the empty car is 12800kg. The starting speed of the 780N.m starting gear is very smooth with the 4th gear, and the whole car has no jitter at the instant when the clutch is fully released. As long as you find the feel, you can use the two-leg clutch operation to easily complete the file, and the sound of pinion collision is rarely issued. The disadvantage is that the gearbox is difficult to hang upside down, it is understood that the reverse gear requires the driver to give 150N.m of force in order to push the gear bar, which is not a small demand for the driver, when reversing, the reporter almost used his hands to hang Reverse gear. The rubber sleeve on the gear lever is not fastened, and the rubber sleeve is easy to move when the reverse gear, 7th gear, and 8th gear (these gear and arm angles are relatively large) are linked, resulting in a gear shift failure.
The steering wheel feels better and the required steering force is controlled within the range of one hand's rotation. Therefore, even if there is no direction in the rain and snow, there is no sense of direction. In the form of a 45km/h speed on a pit road, the fish-abdominal frame firmly stabilized the tall tops without excessive metal knocking. Although the test drive did not use suspension seats, the full-floating shock absorption effect at 4 o'clock was excellent, and the occupants in the car did not feel excessive jolts. The double rear axle has always been a strong player on the potholes. Alternating modes of damping make the vehicle show strong driving stability, and no serious roll will occur during sharp turns. In the pit roads, it is necessary to increase or decrease the number of gears frequently. The 9-speed gearbox matched by the Hualing heavy truck performs very well on this kind of road surface, and each road condition can find a suitable gear to deal with. When using a two-legged clutch downshift operation, the throttle lever needs to raise the engine speed and then push the gear lever into the lower gear.
From the 4th gear, when the rapid acceleration begins, we can feel two obvious speed-increasing processes in the vehicle: 1. In the early stage when the accelerator is stepped on, the engine speed is slower from 800 rpm to 1400 rpm, and it is a little slow; 2. When the engine rotates After being raised to 1,400 rpm, experienced drivers can hear the high-speed rotation of the supercharger's rotor. The entire vehicle suddenly looks like a horse from Xinjiang. The people in the car feel a strong push and the engine speed rises rapidly. To 2500 rpm, and the engine can continue to maintain a large torque output between 1400rpm-1800rpm. After the reporter added to the 8th gear, the pointer of the speedometer had fallen to 86km/h at a speed of 2200rpm. At this time, the speed of the engine has an upward trend. Considering the rain and snow weather and the lack of running-in period of the vehicle, the reporter Reduced throttle. According to Xu Hongyin's engineers, the engine speed is more than 97km/h at 2500rpm, which is considered to be the speed of the dark horse in the concrete mixer market. The matching Cummins engine has always been a representative of high-speed diesel engines, and if it can further improve the torque at low speeds is more perfect. After a short period of taxiing, the noise on the rear axle is relatively low. Thanks to the cab's excellent sound insulation and the low noise of the Cummins engine, occupants can't hear deafening noises at high speeds. Valin heavy duty truck brakes are soft, and the brakes are not stiff when you step on a small pedal range; however, as long as you step on a larger pedal range, the brakes are not soft. In the case of emergency braking on rain and snow roads, the footprint length and depth of the two tires are very synchronized, and it can be seen that there is no deviation in the braking.