Recent content by Mechie100

I have a hydrostatic transmission, with a cold start issue. The hydrostat is a pump/motor combo with a intermediate high pressure accumulator and low pressure reservoir. The hydraulic fluid viscosity at cold temperature is acceptable (no derate), but the system pressure does not build for...

I have a mobile application of a bent axis pump. Can someone tell me what parameters (and based on what equations) to accelerate in testing to confirm pump life.

Thanks to all for the feedback and helpful hints.

The anodised spool is rubbing against the aluminum bore. The valve sticks only about 5% of the time.

I can see the uneven edge when I plot the profile. Btrueblood, is there any design solutions other than post machining. They tell me that the common filtration in automotive application is 50 microns. Is this problem common in auto applications.

The transmission is running at 100 deg C, with aluminum spool on aluminum valve body. I do not expect relative thermal expansion to be a problem. The valve bore is reamed. The filtration is set to 50 microns. I am pretty sure that the stickyness is from the corner radius (or the...

I have a automatic transmission control application with sliding aluminum spool valves running in a aluminum valve body. I am having difficulty with controlling the corner break in the spool valve, after the Hard coat anodizing process. The uneven corner profile creates a space for debris to...

I have a 4T65E transmission in my 2000 Chevy Venture Extended Van with about 100K miles. Recently it has developed a shudder, at moderate or aggressive launch from Stop light. The shudder happens between 5 and 15 mph (so no TCC related issue?). Any pointers to root causes...?

I cannot imagine that there is a free body diagram software that is useful in most engineering situations. However, some colleges may have coursework software with pre-solved problems for student training. Sorry, cannot think of anything else.

Thanks everyone for your comments.

I understand that the transfer gear can be a big source of noise in a automotive transmission. In a new test transmission, I have improved the gear manufacturing accuracy to the point that a 1 or 2 micron difference in gear geometry is the difference between the noisy and the quiet gears...

In the camshaft drive gear of the 2005 toyota highlander engine, there is a circular cylinder attached to the camshaft drive gear. It is bolted onto the drive gear, and it has a magpickup on one side. I do not have the engine teardown manual. Would anyone know what it is? My guess is that...