New ways of presenting information in a web browser are presented wherein documents categorized as belonging to the same web site or application are grouped together and presented in either an first mode where a browser window is open and one of the resources categorized as belonging to the group is displayed, or in a second mode where the group is represented by an icon.

Information management and display in web browsers

A life-cycle prognosis is created of a rolling-element bearing. As from manufacturing of the bearing and during the bearing's life-cycle that may include periods of the bearing's non-use, service life data is obtained indicative of one or more factors that occur during the life-cycle and that affect the length of the life-cycle. The service life data is obtained together with identification data that is representative of a machine-readable identifier, applied to the bearing at manufacturing. The identifier serves to uniquely identify the bearing throughout its life. The identification data is used for identifying in a database a history log of the bearing. The service life data is accumulated in the history log of the bearing as from the manufacturing. The history log is used with a specific mathematical life-cycle model for creating an update of the life-cycle prognosis.

Bearing life cycle prognostics

The invention discloses an automobile transmission rack endurance test operation state monitoring method. The automobile transmission rack endurance test operation state monitoring method includes the following steps that firstly, all sorts of signals are obtained; secondly, a rotation speed impulse signal, a torque voltage signal, a vibration acceleration signal and a gear acceleration signal are processed and then input into a data collector to be converted into digital signals which are input into a computer; thirdly, all monitoring zones are divided; fourthly, the computer performs angular domain recollection by means of the input signals to obtain an order spectrum; fifthly, self-learning reference spectral line generation of all the monitoring zones is performed; sixthly, the real-time order spectrum obtained through angular domain recollection is compared with a reference spectrum, if a preset value is exceeded, an alarming order is started. According to the automobile transmission rack endurance test operation state monitoring method, zone division is performed on gears, rotation speeds, torque and oil temperature parameters, self-learning can be performed on all the monitoring zones to generate a reference order spectral line. The problem that a transmission is complicated in operation conditions and difficult to monitoring is solved. The frequency of faulted alarming of a monitoring system is reduced and monitoring accuracy of the system is improved.

Automobile transmission rack endurance test operation state monitoring method

The invention relates to a method for determining a face gear slotting cutter tooth form structure, which can determine a reasonable tooth number of a face gear slotting processing cutter based on the basic principles of face gear slotting gear processing and face gear meshing drive in comprehensive consideration of affects of different slotting cutter tooth number to the processing dimensions of a face gear and the drive meshing performance of a processed face gear, and further determines a face gear slotting cutter structure to be processed according to the tooth number of a pinion that is matched with the face gear. The face gear processed by the determined face gear slotting cutter tooth structure has good drive performance, the follow-up cost to reshape the face gear in order to improve the meshing performance of the face gear is saved, and meanwhile, the processing efficiency of the face gear is improved.

Design method for face gear slotting cutter tooth form

The invention discloses a design method of a transmission helical gear. The method comprises the following steps: a step of using Romax software to build a transmission model; a step of adjusting structure parameters of a transmission in a certain range, and performing arrangement and combination of gear pairs of each gear; a step of screening the arranged and combined gear pair combination according to a constraint condition; a step of performing safety factor calculation and reliability screening on the gear pair combination screened through the constraint condition; and a step of performing transfer error calculation and comparative analysis on the gear pair combination subjected to the reliability screening. The design method of the transmission helical gear provided by the invention can reasonably and accurately design the structure parameters of the transmission helical gear, and reduce the gear whine noise of the transmission.

Design method of transmission helical gear

Disclosed is a matching and life assessment method of an automobile transmission bearing; based on the common structure, operation gears and the supporting positions of the automobile transmission, the transmission support shaft is used as the basic unit to establish the transmission shaft force models and the analysis calculation modules under the transmission system proposals; the modules are processed with force analysis separately; the modules are independent mutually and can be combined according to the requirements. The concrete steps are as the followings: a) firstly, a transmission system proposal is selected to process the system model selection and the analysis computation module selection; b) the vehicle performance and the relative structural parameters of the transmission areinputted to process the force analysis of the transmission shaft modules; c) the bearing with a certain type and model is selected to obtain the parameters of the selected bearing for the check calculation of the service life of the bearing; d) when the calculated service life values of the bearing modules cannot satisfy the expected service life values, different bearings can be selected in the bearing database to repeat the mentioned steps; e) the proposals are processed with comparison calculation to obtain the satisfactory results; finally, the proper bearing is selected.

Selection and service life assessment method for automobile speed variator bearing

A design method of a Web technology-based automobile transmission gear drive system is provided, which belongs to the technology field of computer application. The steps are that: the system computes actual center distance or user directly gives the actual center distance; the system determines the range of lowest grade speed ratio and highest grade speed ratio value and allocates the grade speed ratio of the transmission; tooth number determination module is called to determine the tooth number, module number and helix angle; the system computes diameter of reference circle, inputs normal reference circle pressure angle, normal radial gap coefficient, normal tooth addendum coefficient and tooth width, calls addendum coefficient to compute and allocate the module, computer normal addendum coefficient sum and allocates the normal addendum coefficient; the system gives warning if the selected addendum coefficient is not in compliance with the requirement; the design result is checked. The invention can effectively solve the problem of difficult development and design of transmission gear drive system products and facilitate the design of the automobile transmission gear simple, convenient and fast and accurate.

Junwei Wang

Papers

Selection and service life assessment method for automobile speed variator bearing

Design method of gear transmission system of automobile transmission based on Web technology