Static Torque Tester

• US 20080223151A1
• Filed: 03/14/2007
• Published: 09/18/2008
• Est. Priority Date: 03/14/2007
• Status: Abandoned Application

• Current Assignee: PEER Bearing Co. (SKF)
• Original Assignee: PEER Bearing Co. (SKF)
• Inventors: Lai, Lou Lu
• Application Number:
  US11/685,829
• Publication Number:
  US 20080223151A1
• Time in Patent Office: Days
• US Class Current: 73/862.08
• CPC Class Codes: G01L 5/0042 applying a torque
• CPC Class Codes: G01M 13/04 Bearings

Abstract

A device and a method for measuring and indicating the static torque of a tapered roller bearing under varying axially applied loads. The device includes a base having a surface for supporting the cone of a tapered roller bearing, a fixture for engaging the cup of the tapered roller bearing when it is located on the base supporting surface. The fixture is mounted for linear movement with the cup relative to the cone to apply a static load to the cup. A variable static load applying mechanism such as an air cylinder is operatively connected to the fixture. A thrust applying frame which supports a thrust bearing connects the air cylinder and the fixture to uniformly transfer axial loads to the tapered roller bearing being tested. An indicating torque wrench is used to rotate the fixture and the engaged cup of the tapered roller bearing relative to the cone of the bearing under variable axial loads to determine and indicate the torque required. A lineal movement indicator is connected to the fixture to measure and indicate axial linear movement of the fixture and the engaged cup of the tapered roller bearing relative to the cone under various loads.

Claims

1. A device for measuring and indicating the static torque of a tapered roller bearing under varying axially applied loads, said device comprising:

a base having a surface for supporting the cone of a tapered roller bearing,

a fixture for engaging the cup of said tapered roller bearing located on said base supporting surface,

said fixture mounted for linear movement with said cup relative to said cone to apply a static load to said cup,

a variable static load applying mechanism operatively connected to said fixture, and

a socket formed in said fixture,

said socket shaped and sized to receive the stem of an indicating torque wrench to rotate said fixture and said engaged cup of said tapered roller bearing relative to said cone of said tapered roller bearing upon rotation of said indicating torque wrench.

2. The device of claim 1 including a linear movement indicator operatively connected to said fixture to measure and indicate axial linear movement of said fixture and said engaged cup of said tapered roller bearing relative to said cone.

3. The device of claim 1 including an indicating torque wrench having a stem shaped and sized to be removably inserted into said fixture socket.

4. The device of claim 1 in which said base surface supporting the cone of a tapered roller bearing is a recessed wall.

5. The device of claim 1 in which said fixture includes a recessed surface which engages the cup of tapered roller bearing.

6. The device of claim 1 in which said fixture includes a recessed channel to receive the cone, rollers and cage of the tapered roller bearing during engagement of the fixture with the cup of the tapered bearing.

7. The device of claim 1 in which said variable load applying mechanism operatively connected to said fixture includes a thrust applying frame associated with said fixture, a thrust bearing supported on said thrust applying frame, a thrust block engaging said thrust bearing with said thrust block engaged by said variable static load applying mechanism.

8. The device of claim 1 in which said variable static load applying mechanism is an air cylinder.

9. The device of claim 7 in which said fixture is disc shaped, said thrust applying frame includes three posts mounted on said fixture, with said post spaced 120°

apart around said fixture to permit said indicating said torque wrench to be inserted in said socket of said fixture at locations around its periphery.

10. A device for measuring and indicating the static torque of a tapered roller bearing under varying axial applied loads, said device comprising:

a base having a surface for supporting the cone of a tapered roller bearing,

a fixture for engaging the cup of said tapered roller bearing located on said base supporting surface,

said fixture mounted for linear movement with said cup relative to said cone to apply a static load to said cup and not to said cone,

a variable static load applying mechanism operatively connected to said fixture, and

a torque applying and indicating mechanism to rotate said fixture and said engaged cup of said tapered roller bearing relative to said cone of said tapered roller bearing.

11. A method for measuring and indicating the static torque of a tapered roller bearing under varying axially applied static loads, said method comprising the steps of:

supporting the cone of a tapered roller bearing to permit axial movement of the cup of the bearing relative to its cone,

applying a variable static load to said cup of said tapered roller bearing to move said cup in an axial direction relative to said cone, and

measuring the static torque required to rotate said cup relative to said cone while under said applied static force.

12. The method of claim 11 further comprising the step of:

measuring the axial linear movement of said cup relative to said cone brought about by said applied static force.