Dual Displacement Radial Piston Hydraulic Motors

The new range of Dual Displacement Radial Piston Hydraulic Motors from SAI, offers Low Speed controllability and performance, down to "creep" speed, coupled with High Speed running capabilities of up to 3500 RPM in certain sizes.

 

The high Starting and Running Torques produced across the full Speed range, as normally associated with Radial Piston Motors, can now be combined with High Speed Running all within one relatively light and compact unit. The Motor's added ability to operate in the "Free Wheel" mode makes it ideally suited to Winch applications as well as to both On and Off-Highway Transmissions.

 

Two ranges, known as the "BD" (BD1 pictured) and the "GD" series, give displacement combinations ranging from 25 to 1848 cc/rev, with variation ratios of approximately 2:1, 3:1 and 4:1. Switching from Large to Small Displacement is achieved by simply applying 20 Bar Pressure to the Pilot Port. This alters the throw of the Crankshaft Eccentric and hence the geometric Displacement. If required, the changeover operation can be carried out dynamically resulting in a smooth transition from Slow to High Speed.

 

This newly released product line is the result of some 10 year's of continuous development and testing in SAI's own R & D Division, as well as lengthy Field Trials in the most arduous of conditions.
 
The Chart which follows shows how the range has expanded

	Frame	Displacement cc/rev	Approx Run Torque     Nm/bar	Approx Start Torque   Nm/bar	Max Continuous Speed  - RPM	Peak Speed RPM	Peak Power Kw
	BD1	99	1.418	1.347	500	1500	55
		25	0.358	0.340	1500	3500	42
	BD1	172	2.464	2.341	500	1000	55
		43	0.616	0.585	1500	3000	55
	BD1	243	3.481	3.307	500	850	55
		60	0.860	0.817	1500	2000	55
	BD2	251	3.596	3.416	700	1000	70
		63	0.903	0.857	1500	2400	60
	BD2	251	3.596	3.416	700	1000	70
		88	1.261	1.198	1500	2000	60
	BD2	251	3.596	3.416	700	1000	70
		126	1.805	1.715	1500	1800	60
	BD2	347	4.971	4.723	700	1000	75
		87	1.246	1.184	1500	2200	65
	BD2	347	4.971	4.723	700	1000	75
		121	1.734	1.647	1500	2000	65
	BD2	347	4.971	4.723	700	1000	75
		173	2.479	2.355	1500	1800	65
	BD2	493	7.063	6.710	400	800	75
		121	1.734	1.647	1500	2200	65
	BD2	493	7.063	6.710	400	800	75
		173	2.479	2.355	1100	2000	65
	BD2	493	7.063	6.710	400	800	75
		247	3.539	3.362	800	1600	65
	GD4	547	7.837	7.445		700	140
		192	2.751	2.613		1400	120
	GD4	887	12.708	12.072		600	140
		310	4.441	4.219		1200	120
	GD4	1018	14.585	13.855		500	140
		356	5.100	4.845		1000	120
	BD5	957	13.711	13.025		700	170
		246	3.524	3.348		1400	150
	BD5	1505	21.562	20.484		600	170
		387	5.544	5.267		1200	150
	BD5	1848	26.476	25.152		500	175
		475	6.805	6.465		1000	150
To ensure the best selection, it is ALWAYS advisable to submit FULL application Details.
All of the above can be supplied fitted to Reduction Gearboxes to give even more choices
It is possible to supply other Displacement Combinations - please ASK if your requirement is not shown
These motors are currently only available with Female Splined Shafts. Some adaptors are available

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