一、 公司简介：
公司成立于1962年，致力于汽车发动机齿轮和部件总成产品的生产。
公司产品知名度相当高，注册商标my、cxc分别获大连市和辽宁省，发动机齿轮和并条机变速箱总成或辽宁省产品。
拥有自身特点的核心技术，主持修订行业标准（内燃机正时齿轮技术条件）。
具体详情请登陆：gearbox.cc

Company profile
The company was founded in 1962. It has been striving hard for the product production in terms of the gears of diesel engine for automobile as well as the components and assembly.
The company has got a high reputation. The trade mark “my” and “cxc” registered have respectively been selected as well-known trade mark of Dalian and well-known trade mark of Liaoning province. The gear of diesel engine and the draw frame speed changing assembly have been won the title of excellent product of Liaoning province.
The company has got the core technologies of self-characters, host and revise the industry standard (the technical conditions of spur timing gears for the internal combustion engine)
As to the detail information, please refer to: gearbox.cc

二、 发动机平衡器任职要求
工作职责：
1、与公司共同开发设计轿车四缸发动机平衡器总成及零部件的图纸，对平衡轴不平衡量的测定和控制来满足抵消发动机二次往复惯性力的要求和可靠性要求，同时完成齿轮、衬套、平衡轴等疲劳强度计算，满足使用寿命要求。
2、对工艺、工装量检具的设计进行先期策划指导和评审，对设计存在的不足给出改进意见。
3、为工装样件制造提供加工设备、检测仪器的信息。
4、对四缸发动机平衡器总成的工装样件制造进行技术指导。
5、对平衡器总成的不平衡量进行分析，并指导平衡轴工装样件制造和测量。
6、对四缸发动机平衡器总成的装配进行技术指导，对装配中发现的问题及时整改，确保满足平衡器总成要求。
7、根据台架试验和道路可靠性试验的数据及时提出改进措施。
Job responsibilities:
1. To develop and design balancer assembly of four-cylinder engine for cars as well as the drawings of components. To measure and control the unbalancing amount of the balancer shaft so as to meet with the requirements to offset the secondary reciprocating inertial force as well as the requirements of its reliability. Meanwhile to accomplish the fatigue strengthen calculation in terms of gear, bush and balance shaft so as to meet with the requirements of running life.
2. to guide and evaluate the APQP designing work in terms of engineering as well as the tools of the inspection instrument. To provide the improvement opinions on the shortcomings existed in designing.
3. To provide the information of the advanced equipment for manufacturing of the tools as well as the information of the inspection instrument.
4. To provide the technical guidance for the manufacturing of the tool sample products used for the four-cylinder engine balancer assembly.
5. To analyze the unbalancing amount of the balancer assembly and to provide the guidance to the measurement as well as the manufacturing of the balance shaft.
6. To provide the technical guidance to the assembling of the four cylinder balancer assembly and to promptly rectify and reform the problems occurred during assembling so as to meet with the requirements of the balancer assembly.
7. To quickly provide measures for improvements according to the data of bench test and road reliability test.
项目的关键技术：
平衡轴不平衡量的测定和控制以及平衡器总成寿命和可靠性要求等是本项目的关键技术所在，具体设计到工艺方面包括如下几点：
1、壳体、平衡轴的毛坯强度大、铸造精度要求高。由于装配空间限制，壳体壁厚尺寸薄，因此需采用热型模铸造，控制毛坯的疏松、气孔等铸造缺陷，确保高强度和精度的要求。
2、上、下壳体孔与孔之间位置度0.03mm，组装后平衡轴对安装基准孔位置度0.006mm，精度非常高，只有采用的工艺和进口的加工、高精度外圆磨床，才能保证其要求；由于平衡轴的不平衡量是用来抵消四缸发动机产生二次往复惯性力的震动，平衡轴不平衡量相互差不能超过3%，这需要在加工、组装过程中来测定和修正不平衡量，因此需要技术和进口的高精度不平衡检测仪器，才能满足需求。
3、平衡器与发动机连接，要求平衡器传动平稳，噪音在78db以下，因此，齿轮设计需齿形、齿向全面修形和高精度的设备来保证。
Key technology:
The key technology of this project lies in how to measure
and control the unbalancing amount of balancer shaft and the requirements of running life and the reliability of the balancer assembly. The detailed requirements relating to the workmanships are involved in the following aspects:
The strength of the rough cast of the case and balancing shaft require bigger strength, and higher forging accuracy. Because of the limited assembling space and the wall thickness of the case is very thin, it needs to be forged by with hot model and meanwhile the forging defects have to be controlled in terms of porosity and air hole of the rough cast so as to ensure the requirements of high strength and high accuracy.
The position of holes of the up and down case is 0.03mm.After assembling, the position of the balance shaft to the installation datum hole is 0.006mm, the accuracy is so high that only by using advanced engineering and the imported machining center as well as the high precision cylindrical grinder can the requirements be ensured. The unbalancing amount of the balancing shaft is used to offset the vibration coming from the secondary reciprocating inertial force caused by four-cylinder engine, the differences of the unbalancing amount between the two balancing shafts can not exceed more than 3%. So it requires to measure and modify the unbalancing amount during the processing and assembling. Therefore, only by using advanced technology and imported unbalancing inspection instruments of high accuracy, can it meet with the requirements.
Balancer is connected with engine, the balancer requires smoothly transmission, and the noise of balancer requires to be below 78db. The gears designing need to be guaranteed by the overall modification of gear profile and gear lead and by the utilization of the equipment of high accuracy.
三、 发动机正时齿轮需要解决的问题
1、目前产品寿命50-80万公里，需要提升到100万公里；
2、目前产品噪声：氮化齿轮在82-85db,磨齿齿轮在 78-86db ,需要进一步降低和稳定；
3、产品加工工艺主要为渗碳淬火磨齿和调质氮化剃齿两条主线，自身认为过程效率低、成本高，需要采用的工艺或者对现行的工艺、加工方法进行改进。
4、可以考虑在产品结构、材料等设计方面进行改进。
5、减少热处理后齿轮变形。
The mechanical specialist specialized in timing gear of engine for
automobile
The problems required to be soled by the specialist of the timing gears of engine for automobile:
1、 At present, the running life of the gears has reached 0.5-0.8 million Km. The target of one million Km running life needs to be achieved
2、The present noise status of the products remains at: the nitriding gear noise is 82-85db and the carburizing gear noise is 78-86db, both needs to be further lowered and stabilized.
3、The main processing engineering for the manufacturing of the products consists of two ways----- No.1 is gear grinding after the gears have been carburized and quenched; No.2 is gear shaving after the gears have been nitrided and tempered & quenched. We have found that both of the engineering technologies have the defects of low efficiency and high cost .Therefore ,the advanced workmanship needs to be adopted or further improvements should be made on the current workmanship and the ways of processing.
4、It needs to be considered to improve the designing work in terms of product structure, the raw materials and so on.
5、Try to reduce the gear deformation after the heat treat.

邮箱：gecxc@126