BLINCE OMT Orbital Hydraulic Motors

Product Overview

BLINCE OMT motors are fixed-displacement orbital hydraulic motors built around a geroler gear set, disc flow distribution and an output shaft supported by tapered roller bearings. They convert hydraulic flow and pressure differential into rotary speed and torque for machinery drives. The reviewed BLINCE catalog lists OMT 160 through OMT 800 configurations, with geometric displacements from 161.1 to 801.8 cm³/rev.

Choosing an OMT motor starts with the driven mechanism: required starting torque, normal running torque, target speed and the hydraulic supply available at the motor. The model number alone does not establish the displacement, installation dimensions or permissible working condition. For example, OMT 315 is listed at 326.3 cm³/rev, and larger displacement models have different continuous pressure and speed limits.

This page brings the catalog model rows together with the main shaft, flange and port decisions needed for an equipment build or replacement inquiry. Agricultural conveying equipment, material-handling drives and industrial rotary mechanisms are potential selection contexts, subject to the actual load and circuit review. Specify the full configuration and duty cycle so that the selected hydraulic rating, mechanical connection and installation drawing describe the same motor.

Key Features

• Geroler gear set: the roller-type internal gear arrangement forms the working chambers that produce rotary output. It identifies the motor construction when comparing it with a gerotor or piston motor.
• Disc flow distribution: a separate distribution arrangement directs oil to the working chambers in sequence. The disc-valve construction is part of the OMT configuration and should remain attached to its own model data.
• Tapered roller bearing support: the catalog identifies this output bearing arrangement. A belt, sprocket or offset coupling still requires its own shaft-load review; the torque rating is not a radial-load rating.
• Model-specific continuous limits: separate displacement rows let an engineer compare torque and speed without applying the smallest model's pressure rating to the largest model.
• Several installation arrangements: the catalog distinguishes OMT, OMTE, OMTZ, OMTS and OMTJ drawings. This helps identify the required mounting layout before an order is coded.
• Keyed, splined and tapered shaft choices: the catalog drawings provide alternatives for different driven connections. Match the full shaft profile and engagement length, rather than diameter alone.

Technical Specifications

The source table includes an OMT 230 column, while the standard OMT order chart does not list that displacement code. Confirm the specific 230 configuration before ordering.

The following values are transcribed from the BLINCE OMT catalog, printed page 57. Pressure differential is the pressure drop across the motor; it is not the same as inlet pressure. These columns are separate limits and must not be combined into one assumed performance point.

Flow and duty information

The catalog separately lists a maximum continuous inlet pressure of 21 MPa for these rows. That value does not replace the lower continuous pressure-differential limit of an individual model. Continuous torque is also distinct from starting torque. Request the applicable performance curve and starting data for the intended operating point.

The source footnotes define intermittent operation as up to 6 seconds per minute and peak operation as up to 0.6 second per minute. A short-duration classification is not a normal operating rating. Oil temperature, viscosity, return pressure and the supplied version must be considered during final selection.

How the OMT Motor Works

Pressure oil enters the expanding chambers of the geroler set while oil leaves the contracting chambers. The inner gear moves within the roller-equipped outer arrangement and transmits motion to the output shaft. The disc distribution system times the filling and emptying of the chambers.

For a fixed displacement, available flow largely determines speed, while pressure differential and mechanical losses determine the torque available to the load. Internal leakage means that a flow calculation alone does not predict the exact loaded speed. Use the performance curve for the selected configuration to connect flow, pressure and actual output.

Application Considerations

Agricultural feed or conveying drives: provide the starting load with material in the machine, normal shaft speed and expected reversals. Check the motor output connection and external shaft load if the conveyor uses a chain or belt.

Material-handling rotary equipment: compare the normal and transient torque demand, acceleration and stopping sequence. An OMT torque rating does not establish a holding-brake function.

Industrial rotary mechanisms: state the available flow at the motor and the permitted return-line pressure. Where the mechanism needs very low speed or frequent starts, obtain the relevant curve and starting-torque information.

These are engineering selection scenarios, not blanket approvals for every machine in an industry.

Dimensions and Installation

The catalog provides separate drawings for the standard OMT arrangement and its E, Z, S and J variants. Dimensions from one arrangement must not be used to manufacture the bracket or coupling for another.

For the standard OMT, flange code 4, the reviewed drawing and order chart identify four Ø14 mm mounting holes on a Ø160 mm bolt circle and a Ø125 × 9 mm pilot. For flange code K6, the order chart identifies four Ø14.5 mm holes on a Ø162 mm bolt circle and a Ø127 × 9 mm pilot. These are catalog interface examples, not universal OMT dimensions. Check drawing tolerances and the current approved version before machining.

The standard OMT order chart includes a Ø40 mm keyed shaft, Ø38.1 mm keyed and spline choices, and tapered shaft alternatives. Its port codes include G3/4 and M27 × 2 arrangements, alongside UN thread options. Select the corresponding drain connection with the pressure ports; a port code is a configuration choice rather than a conversion instruction.

Before installation, confirm shaft alignment, coupling engagement, available body and hose clearance, mounting fasteners, and the required return and drain arrangement. For a drive with an external radial load, provide the force and its distance from the mounting face. Published hydraulic torque does not establish the permissible bearing load at that position.

Model Selection Guide

1. Establish normal and starting torque at the driven shaft, including any transmission ratio.
2. Select a displacement row whose hydraulic duty fits the intended pressure, speed and operating duration.
3. Estimate flow, then use the appropriate curve to check actual performance.
4. Match the shaft, flange, pressure ports, drain and body envelope against one configuration drawing.
5. Supply the duty cycle, return pressure and operating fluid information for final review.

Calculated flow example: OMT 315

For an initial estimate, ideal flow is Q = Vg × n / 1,000, with displacement Vg in cm³/rev and speed n in rpm. At an assumed 100 rpm, an OMT 315 with 326.3 cm³/rev requires 326.3 × 100 / 1,000 = 32.63 L/min before volumetric losses. Actual inlet flow must account for leakage at the selected pressure and oil condition. This calculation is not a BLINCE test result or a guarantee of 950 N·m at 100 rpm.

The comparison between OMT 315 and OMT 400 illustrates the trade-off: OMT 400 has greater displacement and a higher listed continuous torque, but a lower continuous speed and pressure-differential limit. Choose the operating point that meets the machine duty rather than selecting the largest model number.

Replacement and Compatibility

A shared OMT designation or similar displacement does not establish direct interchangeability with another manufacturer's motor. Compare the full original code, pressure classifications, starting and running performance, shaft profile, flange, port and drain connections, overall dimensions and external shaft loading.

Where only part of that comparison has been completed, treat the BLINCE unit as a potential replacement option, subject to technical confirmation. Supply the nameplate photograph and original installation drawing for a specific matching review.

Frequently Asked Questions

Is OMT 315 exactly 315 cm³/rev?

No. The reviewed BLINCE table lists OMT 315 at 326.3 cm³/rev. Use the geometric displacement from the selected model row for a speed or flow calculation.

What is the continuous pressure of the OMT series?

It depends on the displacement row. The catalog lists a 20 MPa continuous pressure differential for OMT 160–315, 18 MPa for OMT 400, 16 MPa for OMT 500, 14 MPa for OMT 630 and 12.5 MPa for OMT 800. Do not apply 20 MPa to every model.

Can maximum torque and maximum speed occur together?

The table does not establish that combination. Check the applicable performance curve at the required flow and pressure differential. The highest figures in different columns are separate limits.

How is flow estimated for an OMT motor?

Multiply geometric displacement in cm³/rev by the required rpm and divide by 1,000 for ideal flow in L/min. A real motor needs additional flow to account for volumetric losses.

Which mounting drawing should be used?

Use the drawing that matches the complete configuration, including standard OMT or an E, Z, S or J variant. Flange codes and pilot dimensions differ; a general product photograph cannot establish the mounting interface.

Does the motor need a separate drain line?

The catalog shows drain-port arrangements, but the connection requirement must be checked for the supplied version and its return-pressure condition. Identify the drain in the approved drawing before installation.

Can an OMT motor replace a Danfoss unit directly?

Direct interchangeability is not established here. Match the complete code, hydraulic duty, shaft, flange, ports, drain and installation dimensions before accepting a replacement.

What should an OEM include in the inquiry?

Include the target torque and speed, available flow and pressure, duty cycle, shaft-load details, installation drawing, quantity and any connection that must remain unchanged. This links the hydraulic selection to the actual machine interface.

Why Choose BLINCE Hydraulic for an OMT Inquiry?

BLINCE's product documentation brings together the OMT model table, installation drawings and configuration chart. That gives an OEM or maintenance buyer a concrete basis for discussing both the hydraulic duty and the physical connection. The company's official technical-support information also describes assistance with installation, maintenance and troubleshooting. Ask which drawing and specification revision will apply to the quoted unit, and identify any special shaft, mounting or port requirement before the configuration is finalized.

Request an OMT Motor Configuration Review

Send the required OMT model or existing motor code, starting and running torque, working speed, available flow, inlet and return pressures, installation drawing and required quantity. For a replacement, add the nameplate photograph and the shaft and port details that must be retained.