US 6,470,846 B1Granted

Broach tool and method of repair

AssigneeK-Line Industries, Inc.

InventorsJames A. Kammeraad, Thomas W. Knowles, II, Dwain L. Kamphuis

Life of this patent

Estimating the term…

Loading patent…

Abstract

A broach tool is provided for use in repairing a camshaft support bearing for operably supporting a camshaft in an internal combustion engine. The engine includes a cylinder head with bearing support towers that operably support journals on the camshaft at multiple aligned bearing locations. A broaching tool is provided that is adapted to be linearly pulled through the aligned bearing locations to reform the bearing support structures. Methods of repair include enlarging at least one camshaft support bearing to an oversized condition, such as by using the broach, optionally repairing the oversized camshaft support bearing by filling voids and galled areas with a thermal setting polymer, as needed, and optionally positioning a bearing insert on the camshaft, and positioning the camshaft including the bearing insert in the camshaft support bearing with the camshaft being rotatably supported in the bearing insert and the bearing insert being secured to the oversized camshaft support bearing.

Claims10

Dependent claims

A broaching apparatus for use in a structural body having spaced-apart bearing supports with aligned holes defining an axis, comprising:

an elongated broach having a longitudinally extending hole extending from end to end of the broach and having first threads formed along at least a portion of the longitudinally extending hole, the broach having a lead section, a cutting section, and a tail section, the cutting section being configured to enlarge the aligned holes from a smaller first diameter to a larger second diameter, and the lead and tail sections being configured to guide the broach linearly through the aligned holes while maintaining accurate alignment with the axis;
and
a motivating device including a broach puller and a holder rotatably receiving the broach puller, the broach puller having a shaft that extends through the holder with second threads on one end configured to mateably engage the first threads, the broach puller further having a configured end opposite the one end that is shaped to be engaged and rotatably driven by a machine, the holder including a first end section rotatably abutting the configured end of the broach puller and a second end section configured to abut the structural body, whereby the aligned holes in the structural body can be broached by pulling the elongated broach through the aligned holes by rotating the broach puller.

Dependencies are inferred from the claim text.

Facts

Application: 09/714,498Filed 15 Nov 2000 · continuation
Priority: 29 Apr 1999
Granted: 29 Oct 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F01L 1/053
Camshafts: overhead type
F01L 1/46
Valve-gear or valve arrangements, e.g. lift-valve gear: component parts, details, or accessories, not provided for in preceding subgroups
F01M 9/102
Lubrication of valve gear or auxiliaries: of camshaft bearings
F01L
Cyclically operating valves for machines or engines