Patents by Inventor Sivakumar Dharmaraj

Sivakumar Dharmaraj has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Valve lifter anti-rotation device and valve lifter assembly in valve actuation system
    Patent number: 11236642
    Abstract: An engine valve actuation system includes a rotatable camshaft, a first valve lifter, and a second valve lifter, structured to actuate valves in an engine in response to rotation of cams of the camshaft. The engine valve actuation system includes an anti-rotation device having a collar with a sleeve portion and a boss portion, and a bridge connector structured to couple with one of the valve lifters. Another one of the valve lifters is slidably received in the sleeve portion. The anti-rotation device reciprocates with the one of the valve lifters, and each of the valve lifters is restricted from rotation during service.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: February 1, 2022
    Assignee: Caterpillar Inc.
    Inventors: Terrence Lee Szmania, Kshitij Anilkumar Shah, Vikram Kulkarni, Sivakumar Dharmaraj
  • Valve lifter anti-rotation device having cantilever bridge
    Patent number: 11220933
    Abstract: An engine valve actuation system includes a camshaft, rotatable in an engine, and a compound collar including a mounting sleeve, a guide sleeve, and a bridge cantilevering the guide sleeve to the mounting sleeve. A first valve lifter is interference-fitted in the mounting sleeve, and a second valve lifter is slip-fitted within the guide sleeve. First and second lifter bores receiving the first and second valve lifters are congruent, and the first and second valve lifters may be substantially identical. The compound collar reciprocates with the interference fitted first valve lifter, slidably receives the slip-fitted second valve lifter, and limits in-service rotation of both.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: January 11, 2022
    Assignee: Caterpillar Inc.
    Inventors: Terrence Lee Szmania, Vikram Kulkarni, Kshitij Anilkumar Shah, Sivakumar Dharmaraj
  • VALVE LIFTER ANTI-ROTATION DEVICE HAVING CANTILEVER BRIDGE
    Publication number: 20210340889
    Abstract: An engine valve actuation system includes a camshaft, rotatable in an engine, and a compound collar including a mounting sleeve, a guide sleeve, and a bridge cantilevering the guide sleeve to the mounting sleeve. A first valve lifter is interference-fitted in the mounting sleeve, and a second valve lifter is slip-fitted within the guide sleeve. First and second lifter bores receiving the first and second valve lifters are congruent, and the first and second valve lifters may be substantially identical. The compound collar reciprocates with the interference fitted first valve lifter, slidably receives the slip-fitted second valve lifter, and limits in-service rotation of both.
    Type: Application
    Filed: May 4, 2020
    Publication date: November 4, 2021
    Applicant: Caterpillar Inc.
    Inventors: Terrence Lee Szmania, Vikram Kulkarni, Kshitij Anilkumar Shah, Sivakumar Dharmaraj
  • VALVE LIFTER ANTI-ROTATION DEVICE AND VALVE LIFTER ASSEMBLY IN VALVE ACTUATION SYSTEM
    Publication number: 20210340885
    Abstract: An engine valve actuation system includes a rotatable camshaft, a first valve lifter, and a second valve lifter, structured to actuate valves in an engine in response to rotation of cams of the camshaft. The engine valve actuation system includes an anti-rotation device having a collar with a sleeve portion and a boss portion, and a bridge connector structured to couple with one of the valve lifters. Another one of the valve lifters is slidably received in the sleeve portion. The anti-rotation device reciprocates with the one of the valve lifters, and each of the valve lifters is restricted from rotation during service.
    Type: Application
    Filed: May 4, 2020
    Publication date: November 4, 2021
    Applicant: Caterpillar Inc.
    Inventors: Terrence Lee Szmania, Kshitij Anilkumar Shah, Vikram Kulkarni, Sivakumar Dharmaraj