Start assist for a vibratory system of a compactor

Patent metadata

Field	Value
Publication number	US-10584449-B2
Application number	US-201816026324-A
Country	US
Kind code	B2
Filing date	Jul 3, 2018
Priority date	Jul 3, 2018
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A hydraulic system may selectively operate in a charging mode or a driving mode, and may include a charging component, an accumulator, an input pump/motor, and an output motor. The charging component may charge an accumulator during operation in the charging mode. The accumulator may store pressure medium during operation in the charging mode, and may supply stored pressure medium to the input pump/motor during operation in the driving mode. The input pump/motor may supply pressure medium to at least the accumulator during operation in the charging mode, and may supply pressure medium to the output motor during at least operation in the driving mode. The output motor may provide output torque based on pressure medium supplied by the input pump/motor.

First claim

What is claimed is:

1. A compactor, comprising:
a vibratory system to selectively operate in a charging mode or a driving mode, the vibratory system comprising:
a charging component to charge an accumulator during operation of the vibratory system in the charging mode,
the vibratory system operating in the charging mode after vibration occurs at a desired vibratory speed;

the accumulator to:
store pressure medium during operation of the vibratory system in the charging mode, and
supply stored pressure medium to an input pump/motor during operation in the driving mode;

the input pump/motor to:
supply pressure medium to at least the accumulator during operation of the vibratory system in the charging mode, and
supply pressure medium to an output motor during at least operation of the vibratory system in the driving mode; and

the output motor to provide, to a vibration component of the vibratory system, output torque based on pressure medium supplied by the input pump/motor.

2. The compactor of claim 1 , wherein, during operation in the charging mode, the charging component is to charge the accumulator based on an artificially elevated load on the input pump/motor,
wherein the charging component proportionally induces the artificially elevated load on the input pump/motor.

3. The compactor of claim 2 , wherein the input pump/motor is to supply pressure medium to the output motor during operation in the charging mode.

4. The compactor of claim 1 , wherein, during operation in the charging mode, the charging component is to charge the accumulator while the output motor is not caused to turn.

5. The compactor of claim 4 , wherein the charging component proportionally charges the accumulator while the output motor is not caused to turn.

6. The compactor of claim 1 , wherein, during operation in the charging mode, the charging component is to charge the accumulator based on pressure medium supplied by the output motor during deceleration of the vibratory system.

7. The compactor of claim 1 , wherein the charging component is to charge the accumulator before the output motor is supplied by the input pump/motor.

8. The compactor of claim 1 , wherein, during operation in the driving mode, the input pump/motor operates a motor when being supplied pressure medium by the accumulator, and operates as a pump when receiving input torque from an engine of the compactor.

9. A hydraulic system to selectively operate in a charging mode or a driving mode, the hydraulic system comprising:
a charging component to charge an accumulator during operation in the charging mode,
the hydraulic system operating in the charging mode after vibration occurs at a desired vibratory speed;

the accumulator to:
store pressure medium during operation in the charging mode, and
supply stored pressure medium to an input pump/motor during operation in the driving mode;

the input pump/motor to:
supply pressure medium to at least the accumulator during operation in the charging mode, and
supply pressure medium to an output motor during at least operation in the driving mode; and

the output motor to provide output torque based on pressure medium supplied by the input pump/motor.

10. The hydraulic system of claim 9 , wherein, during operation in the charging mode, the charging component is to charge the accumulator based on an artificially elevated load on the input pump/motor.

11. The hydraulic system of claim 10 , wherein the input pump/motor is further to supply pressure medium to the output motor during operation in the charging mode.

12. The hydraulic system of claim 9 , wherein, during operation in the charging mode, the charging component is to charge the accumulator while the output motor is not caused to turn.

13. The hydraulic system of claim 12 , wherein the charging component proportionally charges the accumulator while the output motor is not caused to turn.

14. The hydraulic system of claim 9 , wherein, during operation in the charging mode, the charging component is to charge the accumulator based on pressure medium supplied by the output motor.

15. The hydraulic system of claim 9 , wherein the charging component is to charge the accumulator before the output motor is supplied by the input pump/motor.

16. The hydraulic system of claim 9 , wherein, during operation in the driving mode, the input pump/motor operates a motor when being supplied pressure medium by the accumulator, and operates as a pump when receiving input torque from an engine.

17. A method, comprising:
charging, by a charging component of a hydraulic system, an accumulator of the hydraulic system,
wherein the charging component charges the accumulator during operation of the hydraulic system in a charging mode, and
wherein the hydraulic system operates in the charging mode after vibration is occurring at a desired vibratory speed;

supplying, by the accumulator, stored pressure medium to an input pump/motor of the hydraulic system,
wherein the accumulator supplies the stored pressure medium during operation of the hydraulic system in a driving mode;

supplying, by the input pump/motor, pressure medium to an output motor of the hydraulic system; and
providing, by the output motor, output torque based on the pressure medium supplied by the input pump/motor.

18. The method of claim 17 , wherein, during operation in the charging mode, the charging component charges the accumulator based on an artificially elevated load on the input pump/motor.

19. The method of claim 17 , wherein, during operation in the charging mode, the charging component charges the accumulator while the output motor is not caused to turn.

20. The method of claim 17 , wherein, during operation in the charging mode, the charging component charges the accumulator based on pressure medium supplied by the output motor.

Assignees

• Caterpillar Paving Products Inc
• Caterpillar Inc

Inventors

• Jennings Todd M

Classifications

• E02D3/046 Primary

  by tamping or vibrating, e.g. with auxiliary watering of the soil (E02D3/026, E02D3/08 take precedence; generating or transmitting mechanical vibrations for performing mechanical work in general B06B; tamping or vibrating apparatus for working ballast or railways E01B27/00, for consolidating paving materials E01C19/30, for consolidating concrete in general E04G21/06) · CPC title

• E01C19/22 Primary

  for consolidating or finishing laid-down unset materials ({E01C19/002, E01C19/48, E01C21/00} E01C23/02 {E01C23/065} take precedence; apparatus for generating vibrations in general B06B) · CPC title

• F15B1/027

  having accumulator charging devices · CPC title

• E01C19/286 Primary

  Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll (E01C19/287 and E01C19/288 take precedence) · CPC title

• E01C19/28

  Vibrated rollers or rollers subjected to impacts, e.g. hammering blows ({E01C19/235, } E01C19/29, {E01C19/41} take precedence; {combined with non-vibrated elastically-deformable rolling elements E01C19/233}) · CPC title