Assemblies for a hydraulic gear pump with force balance and internal cooling features

Patent metadata

Field	Value
Publication number	US-12180961-B2
Application number	US-202218550146-A
Country	US
Kind code	B2
Filing date	Jan 14, 2022
Priority date	Apr 30, 2021
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

An example gear pump includes a pump housing having a pump housing channel and an arcuate groove disposed in an interior surface of the pump housing; a pump ring gear disposed within the pump housing and rotatable relative to the pump housing; a pump pinion disposed within the pump ring gear, such that teeth of the pump pinion engage with internal teeth of the pump ring gear; and a pump port block having a first port and a second port, wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel, wherein fluid from the pump housing channel is provided to the arcuate groove to apply a radially-inward force on the pump ring gear.

First claim

What is claimed is:

1. A gear pump comprising:
a pump housing having (i) a pump housing channel, (ii) an arcuate groove disposed in an interior surface of the pump housing, and (iii) a hole that is fluidly coupled to the pump housing channel, wherein the arcuate groove is angularly-spaced from the hole along the interior surface of the pump housing;
a pump ring gear disposed within the pump housing and rotatable relative to the pump housing;
a pump pinion disposed within the pump ring gear, such that external teeth of the pump pinion engage with internal teeth of the pump ring gear; and
a pump port block having a first port and a second port, wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel to cool the pump housing, wherein as the pump pinion rotates, the pump ring gear rotates, thereby providing fluid received from the pump housing channel through the hole to the arcuate groove, and wherein fluid in the arcuate groove applies a radially-inward force on the pump ring gear.

2. The gear pump of claim 1 , wherein as the pump pinion rotates, fluid between the external teeth of the pump pinion and internal teeth of the pump ring gear being provided to the second port applies a radially-outward force on the pump ring gear, and wherein the radially-inward force applied by fluid in the arcuate groove opposes the radially-outward force applied to the pump ring gear.

3. A gear pump comprising:
a pump housing having (i) a first pump housing channel, (ii) a second pump housing channel, (iii) a first arcuate groove disposed in an interior surface of the pump housing, and (iv) a second arcuate groove that is angularly-spaced from the first arcuate groove along the interior surface of the pump housing:
a pump ring gear disposed within the pump housing and rotatable relative to the pump housing;
a pump pinion disposed within the pump ring gear, such that external teeth of the pump pinion engage with internal teeth of the pump ring gear; and
a pump port block having a first port and a second port,
wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the first pump housing channel to cool the pump housing, wherein fluid from the first pump housing channel is provided to the first arcuate groove, and wherein fluid in the first arcuate groove applies a radially-inward force on the pump ring gear, and wherein:
as the pump pinion rotates in an opposite direction within the pump ring gear, fluid is drawn from the second port and provided to the first port for discharge, wherein a respective portion of fluid being provided to the first port is diverted to the second pump housing channel to cool the pump housing, wherein fluid from the second pump housing channel is provided to the second arcuate groove, and wherein fluid in the second arcuate groove applies a respective radially-inward force on the pump ring gear.

4. A gear pump comprising:
a pump housing having (i) a pump housing channel, and (ii) an arcuate groove disposed in an interior surface of the pump housing;
a pump ring gear disposed within the pump housing and rotatable relative to the pump housing;
a pump pinion disposed within the pump ring gear, such that external teeth of the pump pinion engage with internal teeth of the pump ring gear;
a pump port block having a first port and a second port, wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel to cool the pump housing, wherein fluid from the pump housing channel is provided to the arcuate groove, and wherein fluid in the arcuate groove applies a radially-inward force on the pump ring gear;
a pump cover interposed between the pump port block and the pump housing, wherein the pump cover comprises a channel that is aligned with the pump housing channel, and wherein the portion of fluid diverted to the pump housing channel flows through the channel of the pump cover to the pump housing channel;
a thrust plate interposed between the pump cover and the pump ring gear; and
a seal disposed within a seal cavity formed at an interface between the thrust plate and the pump cover.

5. The gear pump of claim 4 , further comprising:
a crescent seal assembly comprising an outer crescent and an inner crescent disposed within the pump ring gear between the pump pinion and the pump ring gear; and
a locating pin disposed in a cavity formed in the pump cover, such that the locating pin protrudes axially from the pump cover, wherein the thrust plate includes a locating pin through-hole, and wherein the locating pin extends through the locating pin through-hole and protrudes from thrust plate to interface with the crescent seal assembly, thereby supporting the crescent seal assembly axially.

6. An assembly comprising:
a main housing having an internal chamber therein;
an electric motor disposed in the internal chamber of the main housing and comprising (i) a stator that is fixedly-positioned in the internal chamber of the main housing, and (ii) a rotor positioned within the stator and rotatable relative to the stator, wherein the rotor comprises: (a) a cylindrical portion, and (b) a spindle portion; and
a gear pump positioned in the main housing, at least partially within the cylindrical portion of the rotor of the electric motor, wherein the gear pump comprises:
a pump housing having (i) a pump housing channel, and (ii) an arcuate groove disposed in an interior surface of the pump housing,
a pump ring gear disposed within the pump housing and rotatable relative to the pump housing,
a pump pinion disposed within the pump ring gear, such that external teeth of the pump pinion engage with internal teeth of the pump ring gear, wherein the pump pinion is mounted to a pump drive shaft that is rotatably-coupled to the spindle portion of the rotor of the electric motor via a spline engagement,
a first seal and a second seal, wherein the spline engagement is interposed between the first seal and the second seal, such that a lubricant is sealed at the spline engagement between the first seal and the second seal, and
a pump port block having a first port and a second port, wherein as the rotor of the electric motor rotates the pump pinion within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel to cool the pump housing, wherein fluid from the pump housing channel is provided to the arcuate groove, and wherein fluid in the arcuate groove applies a radially-inward force on the pump ring gear.

7. The assembly of claim 6 , further comprising:
a cap disposed at an end of the spindle portion of the rotor, wherein the first seal is disposed in a first groove about an exterior surface of the pump drive shaft, and wherein the second seal is disposed in a second groove about a respective exterior surface of the cap.

8. The assembly of claim 6 , wherein as the pump pinion rotates, fluid between the external teeth of the pump pinion and internal teeth of the pump ring gear being provided to the second port applies a radially-outward force on the pump ring gear, and wherein the radially-inward force applied by fluid in the arcuate groove opposes the radially-outward force appli

Assignees

• Parker Hannifin Corp

Inventors

• Kalidindi Satish Kumar Raju
• Zhang Hao
• Chu Yu-Sen

Classifications

• F04C23/008

  Hermetic pumps · CPC title

• F04C2240/808

  Electronic circuits (e.g. inverters) installed inside the machine · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C15/0096

  Heating; Cooling (of machines or engines in general F01P) · CPC title

• F04C15/0042

  Systems for the equilibration of forces acting on the machines or pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title