NOP® Orbmark® is a type of hydraulic motor, driven by internal gear and fluid flow. Nippon Oil Pump has a variety of the line up/variation of its motor and also provides many type of accessories like reducer, control valve. All Orbmark® motors are manufactured/assembled/Inspected in NOP® factories in Japan and provides high-quality products to the many customers.

High performance motor ORB-S series has a built-in taper-roller bearing, having high durability against radial/thrust load.
Its motor is able to receive the high pressure in intake port, and NOP® unique structure of "X-Ring" and "Double-tight processing" prevents troubles by oil-leaking.

See below link to check the basic specs/type of Orbmark motor
Model list of Orbmark® motor (Japanese)

See below link to check performance chart of Orbmark® motor
Performance chart of Orbmark® motor

1. Set up the maximum pressure with under 21MPa.
2. Do not use hydraulic motor for 6 seconds with maximum pressure.
3. Maximum pressure for each product is as following:

Ｓ－０５０→１９．０ＭＰａ
Ｓ－０７０→１９．０ＭＰａ
Ｓ－１００→１９．０ＭＰａ
Ｓ－１２０→１８．５ＭＰａ
Ｓ－１６０→１７．０ＭＰａ
Ｓ－１９０→１７．０ＭＰａ
Ｓ－２４０→１５．５ＭＰａ
Ｓ－２８０→１２．５ＭＰａ
Ｓ－３１０→１２．０ＭＰａ
Ｓ－３８０→１０．５ＭＰａ
Ｓ－４１０→１０．０ＭＰａ
Ｍ－１８→１．４ＭＰａ
Ｍ－２６→１．４ＭＰａ
Ｍ－３５→１．４ＭＰａ
Ｍ－４４→１．４ＭＰａ

1. The type of shaft end for ORB-S is as following:　
   Character C: Unit-Inch (φ25.4mm/Key width 6.35mm)　
   Character M: Unit-mm (φ25.0mm/Key width 7.0mm)
   Character D: Unit-mm (φ25.0mm/Key width 8.0mm)　
   Character S: Unit-Slpine (SAE/6B Spline)　　
   Character J:Unit-Slpine（Involute spline/25x18x1.25)
   Character A:Unit-mm（φ32.0mm/Key width 10.0mm)
2. Use spline-shaft or φ32.0mm/Key width 10.0mm if output torque is more than 280N・m.
3. See and check details on this PDF(Japanese)

Spec of flange/port of ORB-S series motor is as below:

1. Spec of flange 　　　　
   2：2 hall flange (SAE "A") 　　　　
   4：4 bolt frange(SAE "A")
2. Connection port type 　　　　
   Ｐ：Ｒｃ１／２ 　　　　
   Ｆ：φ１２．７　Ｏ ring port　　　
   Ｎ：１／２ＮＰＴＦ 　　　　
   Ａ：Ｇ１／２　O-ring seal

※See details on this PDF(Japanese).

Specs of flange/port of ORB-M is as below:

1. Specs of flange 　　
   2: 2 hall flange 　　　　
   4: 4 bolt flange
2. Connecting port type 　　　　
   Ｐ：Ｒｃ３／８ 　　　　
   Ｆ：φ９　O ring-port

※See details on this PDF(Japanese).

The allowance of back pressure for ORBMARK® motor is 7MPa, but we recommend to set up drain plumbing to protect sealing if back pressure is more than 1.8MPa.

Possible to use external drain for ORBMARK® motor if necessary. After removing the screw in the port to external drain on the top of ORBMARK® unit, connect external drain line. This connection is effective to protect the shaft sealing if back pressure is high.

Even oil flow in the hydraulic motor is stopped, oil may leak from the inner line due to the gravitational force so it might be difficult to stop its rotational power perfectly. In that case, use hydraulic motor with mechanical brake or set up the mechanical stopper.

Radial load character of ORB-S is shown in this PDF(Japanese).

The character of radial/thrust load of ORB-M is shown in this PDF(Japanese).

It is doable to use ORBMARK® motor with series or parallel connection like this (Japanese). In that case, do not overload more than operational pressure and set up return pressure with less than 7MPa.

ISO VG32 type hydraulic oil is highly recommended, contact us if you aim to use other fluid.

ORBMARK® can be used as positive/reverse rotational motor.
See follow below instruction:

IN/OUT: Flow direction of hydraulic oil / Direction of rotation

Counter-balance valves, Brake valves, Counter-balance brake valves are available to connect to Orbmark motor.

Please see below to find valve model list and specs.

Counterbalance_list_pdf

Counter-balance valve is able to drive the hydraulic motor with suitable speed.

Please see the details on this PDF(Japanese).

Normally, it is very hard to stop the rotation of hydraulic motor in a very short time because of the inertia force by its rotational power, and it may cause the damage for hydraulic motor by abnormal high pressure. Brake valve is able to prevent from this trouble.

This valve is an integration system of counter-balance valve and brake valve.

Basic structure and feature is shown at this PDF(Japanese).

1. Hydraulic motor with built-in mechanical brake realizes compactness and high torque. When releasing the pressure in the hydraulic circuit, automatically mechanical brake works and this mechanism enables to brake and stop the rotation of hydraulic motor.
2. As long as hydraulic motor stops, mechanical brake always works and keep the position of rotor stay still.
3. Use this motor under the condition that mechanical brake is fully opened.
4. The accident/trouble comes up if the release of mechanical brake is not enough because of grinding brake disc plate.

Brake release pressure (Pilot pressure) is set by the specification of brake torque.
Release pressure is the gap between input pressure and output pressure, use hydraulic motor with higher pressure than pilot pressure.
Input pressure must be set with less than 21MPa.

Patameter of brake troque/Release pressure
Specification of mechanical brake for Hydraulic motor:

Specs of ORB-PB series: Brake troque 800N・m, Release pressure 1.0MPa

This is the valve to control the release and stop of mechanical brake in the hydraulic motor.
There are two types of its valve, the one is possible to be placed on hydraulic motor, and the second one is to be installer on the hydraulic control valve.It is used to connect C port in shuttle valve itself to pilot port in hydraulic motor.

Circuit diagram of hydraulic motor with mechanical brake and shuttle valve

Reducing mechanism in GRS series is a type of planetary gear that comes with high efficiency to transfer fluid.

Specs and models are shown in below:
ＧＲＳ減速機形式一覧

GRS Reducer has a open-lid and the position of this lid must be higher than the level of oil.

Lubrication oil specified by ISO VG150, Industrial level-2 must be used.

Please follow below.
GRS-1: 200cc
GRS-6: 200cc

1st time: 100 hours go on since GRS starts operating

After 2nd time: Every 1,000 hours

1. Power motor is an integrated one from hydraulic motor, reducer and mechanical brake, and its advantage is compact size, high torque, high performance and enery-saving.
2. Power motor without mechanical brake is also available.

Detailed spec are shown in below page:
Orbmark_specs

Tighten the screw in Orbmark motor with following range.
Port size Rc3/8 type→30-60N・m
Port size Rc1/2 type→60-100N・m