Rotor assembly for resolving incomplete gear shift of a rotory mixer

Patent metadata

Field	Value
Publication number	US-11168750-B2
Application number	US-201916264919-A
Country	US
Kind code	B2
Filing date	Feb 1, 2019
Priority date	Feb 1, 2019
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A rotor assembly for a rotary mixer is disclosed. The rotor assembly includes a main drive configured to rotatably drive the rotor assembly, a main drive clutch enclosed in a drivetrain housing of the main drive, an actuation valve operably coupled to the main drive clutch, the actuation valve configured to actuate the main drive clutch between at least a first position and a second position, a rotor drum, a rotor drive gearbox having an input and an output, the gearbox output operably coupled to the rotor drum, a main drive belt rotatably coupled to the main drive clutch and the rotor drive gear box input such that a rotation of the main drive clutch imparts a rotation on the rotor drive gear box, and a speed sensor operably coupled to the rotor drum, the speed sensor measuring a rotational speed of the gearbox and generating a rotor speed signal, wherein based on when the rotor speed signal is below a predetermined rotor speed threshold the actuation valve is activated to rotate the main drive clutch a predetermined amount between the first position and the second position.

First claim

What is claimed is:

1. A rotor assembly for a rotary mixer, the rotor assembly comprising:
a main drive clutch enclosed in a drivetrain housing;
an actuation valve operably coupled to the main drive clutch, the actuation valve configured to actuate the main drive clutch;
a gearbox having an input and an output, the gearbox input operably coupled to a rotor drive wheel, the gearbox output fixedly attached to a gearbox mounting ring;
a rotor, the rotor defining an interior cavity to at least partially house the gearbox, the gearbox mounting ring fixedly attached to an inner surface of the interior cavity of the rotor;
a main drive belt operably coupled to the main drive clutch and the rotor drive wheel; and
a speed sensor operably coupled to the rotor, the speed sensor measuring a rotational speed of the gearbox and generating a rotor speed signal,
wherein the actuation valve is pulsed to actuate the main drive clutch between a first position and a second position until the rotor speed signal indicates a rotation of the rotor, and wherein when the rotor speed signal indicates the rotation of the rotor, the actuation valve stops pulsing the main drive clutch and the rotary mixer is operated.

2. The rotor assembly of claim 1 , wherein the gearbox includes a set of shifting components operably coupled to the gearbox input and the gearbox output, wherein the rotation of the main drive clutch is transferred to the set of shifting components through the gearbox input.

3. The rotor assembly of claim 1 , wherein the actuation valve is activated by sending a control signal to the actuation valve, wherein the actuation valve is a solenoid valve, and wherein the control signal sent to the actuation valve causes at least one pulse of the actuation valve between an on position and an off position.

4. The rotor assembly of claim 3 , wherein a pulse cycle actuates the solenoid valve a predetermined number of times between the on position and the off position.

5. The rotor assembly of claim 4 , wherein the pulse cycle stops when the rotational speed of the gearbox is above a predetermined rotor speed threshold value.

6. The rotor assembly of claim 5 , wherein the pulse cycle includes a first pulse cycle to actuate the solenoid valve into the on position for an initial on position cycle time and into the off position for an initial off position cycle time, and wherein the pulse cycle further executes subsequent pulse cycles to actuate the solenoid valve into the on position for a subsequent on position cycle time and into the off position for a subsequent off position cycle time.

7. The rotor assembly of claim 1 , wherein the actuation valve is a proportional solenoid valve and a control signal adjusts the solenoid valve between a first actuation pressure and a second actuation pressure.

8. A control system for controlling shifting of a rotor assembly, the control system comprising:
a main drive configured to rotatably drive the rotor assembly;
a main drive clutch operably coupled to a drivetrain housing of the main drive, the main drive clutch having an engaged position and a disengaged position;
an actuation valve operably coupled to the main drive clutch, the actuation valve configured to actuate the main drive clutch;
a gearbox having an input and an output, the gearbox input operably coupled to a rotor drive wheel, the gearbox input rotatably coupled to the gearbox output, the gearbox output fixedly attached to a gearbox mounting ring;
a rotor, the rotor defining an interior cavity to at least partially house the gearbox, the gearbox mounting ring fixedly attached to an inner surface of the interior cavity of the rotor;
a main drive belt operably coupled to the main drive clutch and the rotor drive wheel such that a rotation of the main drive clutch imparts a rotation on the gearbox;
a speed sensor operably coupled to the rotor, the speed sensor measuring a rotational speed of the gearbox and generating a rotor speed signal;
a controller communicably coupled to the actuation valve and the speed sensor, the controller programmed to receive and analyze the rotor speed signal, the controller configured to pulse the actuation valve to actuate the main drive clutch between the engaged position and the disengaged position until the rotor speed signal indicates a rotation of the rotor, wherein when the rotor speed signal indicates a rotation of the rotor, the controller is configured to stop pulsing the actuation valve, to activate the actuation valve to actuate the main drive clutch into the engaged position, and the rotor assembly is operated.

9. The control system of claim 8 , wherein during the pulsing of the actuation valve, rotation of the main drive clutch is transferred to the gearbox, and wherein the transferred rotation aligns and fully engages a set of components of the rotor assembly.

10. The control system of claim 8 , wherein the actuation valve is a solenoid valve and wherein sending a control signal to the actuation valve causes at least one pulse of the actuation valve between an on position and an off position.

11. The control system of claim 10 , wherein the controller is programmed to transmit a plurality of control signals to the solenoid valve, and wherein the control signal activates a pulse cycle of the solenoid valve, each pulse cycle including a predetermined number of pulses.

12. The control system of claim 11 , wherein the predetermined number of pulses is programmed to be 30 pulses or less.

13. The control system of claim 11 , wherein the controller is programmed to execute a first pulse cycle to actuate the solenoid valve into the on position for an initial on position cycle time and into the off position for an initial off position cycle time, and wherein the controller is further programmed to execute subsequent pulse cycles to actuate the solenoid valve into the on position for a subsequent on position cycle time and into the off position for a subsequent off position cycle time.

14. The control system of claim 8 , wherein the actuation valve is a proportional solenoid valve and the control signal includes adjusting the solenoid valve between a first actuation pressure and a second actuation pressure.

15. A rotary mixer, comprising:
a frame;
a power source mounted onto and supported by the frame;
a rotor assembly operably mounted to the frame; and
a control system for controlling shifting of the rotor assembly, the control system including:
a main drive configured to rotatably drive the rotor assembly;
a main drive clutch operably coupled to a drivetrain housing of the main drive;

an actuation valve operably coupled to the main drive clutch, the actuation valve configured to actuate the main drive clutch between an engaged position and a disengaged position,
a gearbox having an input and an output, the gearbox input operably coupled to a rotor drive wheel, the gearbox input rotatably coupled to the gearbox output, the gearbox output fixedly attached to a gearbox mounting ring,
a rotor, the rotor defining an interior cavity to at least partially house the gearbox, the gearbox mounting ring fixedly attached to an inner surface of the interior cavity of the rotor,
a main drive belt operably coupled to the main drive clutch and the rotor drive wheel,
a speed sensor operably coupled to the rotor, the speed sensor configured to measure a rotational speed of the gearbox, generate a rotor speed signal, and transmit the rotor speed signal, and
a controller communicably coupled to the actuation valve and the speed sensor, the controller programmed to receive and analyze the rotor speed sig

Assignees

• Caterpillar Paving Products Inc

Inventors

• Schlenker Brian J
• Muir Jason W
• Enot Ryan A
• Saari Jacob M
• Nieuwsma Derek
• Doy Nathaniel S
• Hogan Lee M

Classifications

• B01F33/502

  Vehicle-mounted mixing devices · CPC title

• B01F27/60

  with stirrers rotating about a horizontal or inclined axis · CPC title

• B01F35/331

  alternately changing the speed of rotation · CPC title

• B01F35/30

  Driving arrangements; Transmissions; Couplings; Brakes · CPC title

• B01F35/20

  Measuring; Control or regulation · CPC title