Browse Topic: Transmission valves

Items (16)
Find
Progress in Demonstration Prototypes Using the Continuously Variable Planetary Technology in a C-Class RWD Car and a Fork Lift Truck2015-01-11044/14/2015
In order to introduce Dana's Variglide Continuously Variable Planetary (CVP) technology to the mobility industry, Dana has produced demonstrator transmissions for use in a rear wheel drive C-class car and in a fork lift truck. The intention is to illustrate how the CVP can be combined with conventional transmission technology to produce either a continuously variable transmission with the ratio range comparable to that of the latest step ratio transmissions, or used in a simple IVT configuration for off-highway applications. The co-axial design of the CVP allows it to package well into current drivetrain solutions. The ratio control of the device is fast, precise, and stable and the CVP does not require high power consumption for clamping. Multiple power flow configurations of the CVP are shown to blend well with current conventional transmission technology as well as future hybrid configurations.
Sexton, Patrick, Smithson, Robert A., McIndoe, Gordon
Assessing the Likelihood of Binding in Distorted Stepped Radius Cylinder Bores2014-01-03954/1/2014
Interference assessments of a stepped-radius power-train component moving within a deformed stepped bore often arise during engine and transmission development activities. For example, when loads are applied to an engine block, the block distorts. This distortion may cause a cam or crankshaft to bind or wear prematurely in its journals as the part rotates within them. Within an automatic transmission valve body, care must be taken to ensure valve body distortion under oil pressure, assembly, and thermal load does not cause spool valves to stick as they translate within the valve body. In both examples, the mechanical scenario to be assessed involves a uniform or stepped radius cylindrical part maintaining a designated clearance through a correspondingly shaped but distorted bore. These distortions can occur in cross-sections (“out-of-round”) or along the bore (in an “s” or “banana” shaped distortions). To assess clearance in a deformed (stepped or uniform) bore, a new optimization based technique is proposed. This paper defines an optimization process that determines an axis assessed as producing the largest clearance between the stepped surface and points defining the bore surfaces. This clearance is calculated for clouds of points representing undeformed and deformed cylindrical bores. From this clearance, shrinkage (or expansion) of a stepped-bore or single-radius bore is estimated. These clearance data are useful in understanding when a part may stick or bind as a result of projected stepped-bore distortion.
Aluru, Kiranmaye, Geist, Bruce, Resh, William
General Motors Hydra-Matic & Ford New FWD Six-Speed Automatic Transmission Family2007-01-10954/16/2007
The Hydra-Matic 6T70 is General Motors first model of a new, two-variant front wheel drive (FWD) six speed automatic transmission family. The second variant is a higher capacity model, the 6T75. The transmission was co-developed with Ford Motor Company. The 6F50 is the Ford variant that aligns with the GM 6T70 transmission. Approximately eighty five percent of the hardware is shared or common between the GM and Ford transmission variants. Ford will also have a higher capacity variant the 6F55 to align with the GM 6T75. The first GM application is the Saturn Aura for the 2007 Model Year. The Ford Edge and Lincoln MKX in MY 2007 will be the first applications for the 6F50. While the Hydra-Matic and Ford FWD six-speed family was designed with two variants in mind, the designed in modularity requires only changes to the second and third axis and case housings depending on specific torque requirements. This modular design enables a tremendous amount of part sharing. Modularity minimizes engineering resources, improves quality and reduces investment, piece cost, time to market and allows for a wide bandwidth of vehicle and engine applications. The current bandwidth of applications ranges from 3.0 L to 4.6 L engines. The planned engine torque capacity for the family ranges from 280 lb.-ft. to 301 lb.-ft. (380 Nm to 406 Nm) with flexibility for future growth. The FWD six speed family is expected to improve both fuel economy and acceleration performance. As an example, the 6T70 is expected to improve fuel economy by as much as four percent, while improving 0-60 mph times by as much as seven percent when compared to the current four speed automatic that it replaces. This is accomplished by a wider overall ratio spread of 6.04:1 compared to the typical 4.0:1 for conventional four-speeds. By developing the transmission jointly, General Motors and Ford Motor Company were able to reduce the engineering cost each had to invest bringing a new transmission to market. Furthermore, synergies with having more “eyes” on the engineering, helped speed the development and assure a robust product when released to the public.
Lewis, Charles, Bollwahn, Bryce
Advances in Automatic Transmission Cleanliness2001-01-03723/5/2001
This paper presents the rationale and underlying logic for automatic transmission filtration contaminant control (ATFCC). This approach relies upon an integrated filtration system as opposed to simply sandwiching in a piece of filter media or metal screen in the traditional transmission oil sump area. Most significantly, quantitative filtration system design and specification will result from implementation of a thorough ATFCC approach. A new transmission filter test procedure is also presented which closely represents the field operation of these types of filters. Test results are presented which compare the new test procedures results' with more traditional Multipass Filter test results.
Eleftherakis, John G., Khalil, Abrahim, Parnell, Doug, Bill, Pizzo, Haggard, Dan
Optimizing Automatic Transmission Filtration1999-01-00043/1/1999
The increasing focus on automotive automatic transmission contamination levels needs to result in both dramatic manufacturing system changes and transmission filtration needs. This paper focuses on defining and quantifying automatic transmission contaminant levels and the filtration needed to remove this contaminant. Specific data are presented which quantify the particle count and gravimetric level of transmissions oil samples. The debris found from numerous used filter analyses is also presented. Representative transmission valve contaminant sensitivity data is then shown which highlights the deleterious effect contaminant has on transmission valve operation. This paper concludes with the particle removal efficiency of common transmission sump filters being shown to be unable to remove many of the most damaging particles which result in transmission valve sticking, wear, and general shift quality degradation. Recommendations for correcting this situation are presented.
Eleftherakis, John G., Khalil, Ibrahim
Saturn Transmission Family; Product and Process Flexibility by Design9119399/1/1991
The Saturn vehicle concept evolved from efforts to derive a domestically produced “small car” that would make use of innovative design and manufacturing techniques (1). Within this framework a new transmission family was developed based on a reassessment of the fundamentals involving design and manufacturing.
Kosin, John F., Maguire, Joel M., Oniga, Louis B.
Development of a Laboratory Test Contaminant for Transmissions9005612/1/1990
This paper details an extensive study that was performed to define, quantify, and describe the contaminant found in automotive type transmissions. The results from the study were used to manufacture a new commercially available test contaminant that simulates the contaminant found in high mileage transmissions. The study was undertaken because no commercially available contaminant existed to test transmission related components, especially valves, pumps and filters. Most accepted test contaminants such as AC Fine or Course Test Dust were known not to give representative contaminant related results. The study consisted of collecting 29 oil samples from various mileage vehicles. The particle size distribution, gravimetric level, and chemical composition were found from the samples. Correlation of this data back to the actual materials of manufacture found that four different base stock materials were contributing over 90% (by weight) of the contaminant found in vehicles with 70,000 to 120,000 miles. Manufacturing methods were then defined which reduced these four materials to the same particle size distribution and chemical composition as found from the field. The test contaminant has consequently been named SYNFORM, for SYNthetically FORMulated. The use of this contaminant is finding widespread use to define valve and pump contaminant service life, filter characteristics, and torque convertor contaminant settling by radioactive tracing, among other applications.
Eleftherakis, John G., Khalil, Abrahim
The FR35-Reliability and Productivity for the Quarrying and Mining Industries8508054/1/1985
A new Fiatallis 5.4 m3 (7.0 yd3) Four Wheel Drive Loader has been developed to replace the 945-B. The features and component selection were influenced by world-wide performance and reliability requirements. This paper summarizes the development program and reviews the major features of the FR35 Wheel Loader.
Lorenc, Don, Condra, James
Electronic Controls for Bus, Truck and Off–Highway Vehicle Transmissions8209092/1/1982
Most bus, truck and off-highway vehicle automatic transmissions today have hydraulic controls similar to the type used on automobile transmissions. Because the number of transmission applications is increasing rapidly and customer demands for improved vehicle performance, greater durability and better reliability are growing, present hydraulic controls are being pushed to their capacity. Overall transmission performance can be improved by replacing hydraulic controls with electrohydraulic controls which incorporate microcomputer-based electronics for intelligence, but continue to employ hydraulics for power to apply the clutches in the transmission. Important benefits available with a microcomputer-based controls system include: shift point optimization, improved shift point accuracy, transmission-application customization, mechanical linkage elimination, improved fuel economy, and overall powertrain optimization.
Harmon, Kenneth B., Struthers, Keith D.
ELECTRONICS ON A JOHN DEERE SCRAPER8006754/1/1980
The JD862 Scraper uses armrest mounted electrical switches to control the transmission and scraper functions. A microprocessor based transmission controller provides different shifting sequences for different operating requirements. This controller also includes on-board diagnostics to monitor for electrical failures and can immediately react to reduce the effect of a failure. An electronically controlled elevator provides infinitely variable elevator speeds.
Gruben, Wayne E., Heino, Dean L.
Expanding the Versatility of the Powershift Transmission by Incorporating Electrohydraulic Control Systems7908842/1/1979
In many powershift transmission applications such as cranes, excavators, articulated vehicles, vehicles with multiple transmissions, and vehicles with remote mounted transmissions, mechanical linkage systems normally used to operate the control valve become impractical and/or expensive. After evaluating these various applications it was determined that an electrohydraulic control system has a multitude of advantages over its mechanical counterpart. With these objectives in mind Funk Manufacturing has designed and developed a series of electrohydraulic control systems which function in concert with the Funk Shift-0-Matic transmissions. The control valve and some of the control systems are briefly described in this paper.
Jones, William R., Harris, Robert W.
The 1978 Chrysler Torque Converter Lock-Up Clutch7801002/1/1978
A torque converter lock-up clutch was introduced by Chrysler Corporation in a majority of its passenger cars in the 1978 model year. The lock-up clutch improves fuel economy by eliminating torque converter slip in direct gear above a predetermined speed. The clutch and its controls were designed to fit within the confines of the existing transmission. The development of the clutch was primarily concerned with achieving adequate endurance life, good shift quality and isolation of torsional vibrations.
Blomquist, A. P., Mikel, S. A.
Automatic Shift Control for Heavy Duty Transmissions7207532/1/1972
Through the years, changes have occurred in vehicle design that have necessitated a re-evaluation of transmission shift systems. Vehicle trends have been towards increased size, articulation, and multi-power usage. Mechanical linkages for these vehicles have become costly to design and build, and are troublesome to maintain due to wear, improper adjustment, and damage. In 1968 an electric shift control concept was introduced for the off-highway heavy duty transmission market to eliminate the problems associated with mechanical, hydraulic, and air linkages. This system consisted primarily of three components: shift tower, wiring harness, and range selector control valve body. Now a new electronic shift control has been developed which enables the transmission with electric shift to achieve the optimum in fully automatic operation. The electronic control ensures that all shifts occur at optimum speeds, eases driver operation, and provides a unit that is precise, reliable, maintenance-free, and adaptable to large and complex vehicles. The new shift control is of significant interest, as described in this paper, because of the complexity of combining electronics and hydraulics to automate the shifting of the heavy duty transmission.
Schmidt, J. W.
Current Design of Valve Body and Governor Systems6201011/1/1962
Hewitt, D. C., Leonard, R. L
Chrysler Torque Flite Transmission5800181/1/1958
THIS paper describes the Chrysler TorqueFlite transmission, a 3-speed unit with torque converter. The discussion includes details of the push-button controls of the automatic transmission, operation of the transmission and hydraulic controls, power transmission through the gearbox, and design of several of the components. The authors think that the TorqueFlite offers to a greater degree the advantages of automatic transmission: ease of operation and maximum power over a wide range of car speeds.
Jeffe, S. D., Cartwright, B. W.
HYDRA-MATIC TRANSMISSION TRUCKING5402091/1/1954
EDWARDS, W. W.
Items per page:
1 – 16 of 16