External gear motors, series APM - BUCHER Hydraulics - #3

HYDRAULICS

Gear motors are widely used in modern hydraulic systems due to their high performance, long service life, and low pur­chase and maintenance costs.

Product development has made it possible to achieve high operating pressures, excellent volumetric and mechanical efficiency, and lower noise levels, in operation, by means of:

- meticulous CAD design of the gear teeth and balancing areas

- an exacting choice of high-performance materials

- carefully controlled heat treatments

Product description

- increasingly tight coupling tolerances, and a high stan­dard of surface finish.

- dedicated first running in cycle for motors specifically set up Bucher Hydraulics S.p.A. has achieved these results by constantly improving its design, control, and manufacturing techniques in line with the latest technological develop­ments, while simultaneously introducing a Quality Control System which ensures that every single product offers the same high standards.

7 - Clamping bolts

8 - Pressure balancing seals

9 - Oil seals

10 - Shaft seal

11 - Shaft seal ring support

12 - Seeger elastic ring

1 - Take off power gear

2 - Gear

3 - Balancing bushings

4 - Motor body

5 - Front cover

6 - Rear cover

Referring to the motor shown in the figure, feeding pressur­ised oil (Q - Ap) into the inlet port of the motor, the gear 1 and 2 turn, and power, as torque and speed (M - n) can be ob­tained at the output shaft end. The gears are made from high strength steel alloy. The bushings (3) serve a dual purpose:

- to act as a bearing for the gears

- to balance axial and radial thrust in proportion to the change in operating pressure.

The gears-bushings assembly is fitted inside the motor body (4), in which generally the inlet and outlet ports are formed. The motor body is made of high strength extruded aluminium alloy. The front cover (5), which also acts as a mounting flange, and the rear cover (6) are connected to one another by clamping bolts (7). The motor assembly is completed by a series of seals:

- Balancing seals (8) can be fitted in recesses in the bush­ings as shown in the figure, or in the covers. Their purpose is to delimit the longitudinal balancing area separating the high and low pressure zones.

- Oil seals (9) prevent oil from leaking out.

- A shaft seal with a steel supporting ring (11) locked by a seeger elastic ring (12) purpose of preventing oil leaks

from the gear shaft end and preventing dust or other pollu­tants from entering the motor itself. Unless otherwise speci­fied, the seals are nitrile NBR compound offering high mech­anical strength and heat resistance. Viton FKM seals are available on request. (see 2.2 Recommended fluids/Allowed temperatures)

The Bucher Hydraulics S.p.A. product range includes mo­tors of groups APM05-APM100-APM200 (corresponding to the common group denominations: 05-1-2). For front flange, shaft- end and inlet-outlet versions, motors are available in many and different European, American and special customised configurations. Moreover motors of the groups 05 and 2 are also available in the reversible rotating version with external threaded drain port. For the group 2, the version with internal drain connection, which does not re­quire any hose, is also available.

Bucher Hydraulics S.p.A. will examine any request for special versions, features, and customisations not shown in this catalogue. To make such a request, please contact our Sales Department.

200-P-991225-E-01/05.08