US2317405A - Device for removing and installing camshaft bushings - Google Patents

Description

April 27, 1943. P. G. RUTTEN 2,317,405

DEVICE FOR REMOVI'NG AND INSTALLING cAMsH F'T BUSHINGS Filed May 6, 1941 2 Sheets-Sheet 1 April 27, 1943. P, RUTTEN DEVICE FOR REMOVING AND INSTALLING CAMSHAFT BUSHINGS 2 Sheets-Sheet 2 Filed May 6, 1941 Patented Apr. 27, 1943 DEVECE- FOR REMOVING AND INSTALLING GAMSHAFT BUSHINGS Paul G. Rutten, United States Army Application May 6, 1941, Serial No. 392,087

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) 2 Claims.

The invention described herein, if patented, may be manufactured and used by or for the Government for governmental purposes without the payment of any royalty thereon.

This invention relates to a simple and yet efficient device for use in removing and installing camshaft bushings in internal combustion engines or any other type of engine that requires the use of a camshaft.

An important object of the invention is to provide a device which is universal and adapted to be used on any engine in the automotive industry.

Another object of the invention is to provide a device which is adapted to engage and remove a bushing which cannot, by reason of its inaccessibility, be readily removed by any other method.

Another object of the invention is to provide a device which will eliminate the old method of removing camshaft bushings by tools in the hands of an operator.

Another object of the invention is to provide a repair device for manipulating bushings and the like by a longitudinal movement in either direction while rotary movement thereof is readily prevented.

Another object of the invention is to provide a device by the use of which at least two womout or defective bushings can be quickly and easily removed, and new bushings inserted simultaneously without causing distortion of the new bushings, and at the same time remain in alignment over its entire length during the operation.

Another object of the invention is to provide a device which prevents mis-alignment or buckling of the new bushings during the insertion thereof.

A further object of the invention is to provide a device which is simple in construction and arrangement, readily operated, durable in service, and a general improvement in the art.

Heretofore, it has been found necessary in the automotive industry to remove old bushings with a hammer and chisel and to drive in new bushings with a hammer and block. This old method caused distortion of the new bushings and as a result thereof low spots in the bushing after line boring thereof. This device was primarily designed to eliminate the old method and, at the same time, produce a tool that would remove and replace the bushings in internal combustion engines, where the old method could not be used due to the inaccessibility of the bushings by reason of the construction of the particular internal combustion engine involved.

The accomplishment of the above and other related objects are embodied in the forms illustrated in the accompanying drawings, wherein the invention is shown consisting of features of construction, arrangement and application of parts, which will appear in the specification and be finally pointed out in the claims.

While the preferred embodiment of the invention is shown, it will be understood that slight changes in form and minor details of construction may be resorted to without departing from the spirit of the invention and fall beyond the scope of the claims.

Referring now to the drawings, in which similar characters and references in the several figures indicate identical parts:

Fig, 1 is a sectional view through the crank case of a motor, illustrating the employment of the device during the extraction and replacing of the bushing in the bearing of a camshaft.

Fig. 2 is a perspective view of the device showing the various parts of the tool.

Fig. 3 is a view partly in side elevation and partly in longitudinal section of the embodiment of the invention in assembled condition.

Fig. 4 is a vertical sectional view of the device, on a line 4-4 of Fig. 1.

Fig. 5 is the same on line 5-5 of Fig. 1.

Reference now being made to the drawings by numeral, I9 indicates the crank case of an explosive motor in which a plurality of bearings I I, I2, l3 and M are provided in axial alignment with each other for journaling the camshaft of the motor, it being understood that a bushing, such as at I5, is provided in the bore l6 of each journal with the shaft, not shown, which is mounted for turning in the bushings, as shown.

The device comprises a rod H, which is of less diameter than the bearing bore l6, having a threaded portion or shank l8 at one end thereof, upon which a nut I9 is threaded.

Loosely fitting on the rod I1 is an abutment or thrust block 28, having a reduced neck or nipple 2| of a size adapted to enter and support the end of the thrust sleeve or end spacer 22. The diameter of the sleeve is such that it is not capable of passing into and through the bore l6 of the journals but is adapted to rest against the side 23 of the motor l0.

The rod I! is adapted to receive loosely thereon a mandrel 24, having on one end a cylindrical extension 25 of less diameter than the diameter of the mandrel 24.

The rod I! is provided with reduced portions 26, which are adapted to receive a horseshoe ring, or washer 21, which is adapted to be inserted to the rear of and abut with the mandrel 24 when the device is in operation.

There is provided a lock or retainer, comprising a spring pressed ball 28, which is adapted to prevent the ring or washer 21 from dropping off of the rod 11. Suitably positioned in the rod [1 are openings 29 which are adapted to receive a pin 30 which contacts with the motor, thereby acting as a stop to prevent rotative movement of the rod when the device is in operation.

From the foregoing, it is apparent that the invention is designed and adapted for extracting or inserting a plurality of bushings of various sizes, depending only upon the length and di ameter of the cylindrical extension 25 of the mandrel 24. Therefore, the same elements can be employed to extract or install bushings of different longitudinal sizes and diameters.

The mandrel 24, which is adapted to engage the ends of the bushings, is provided with an extended, reduced portion, designed and adapted to extend into the bushings, and thus locate the rod co-axially with the bushings, thereby avoiding lateral stress and strains While at the same time preventing the distortion of the bushings.

Pressure is applied to the ends of the bushings in a direction parallel with the axis thereof, so that no twisting or strains occur, and further rotation of the rods is prevented by inserting pins therein which tends to rest against the motor l and acts as stops therefor.

In operating the device, the rod is placed through the camshaft journals and a mandrel is slipped on the rod, being placed on in such a manner that the new bushing will abut the old bushing.

Horseshoe rings or washers are placed in the rear of each mandrel to act as stops therefor. The thrust sleeve is placed so that the forward end thereof will abut against the motor Ill. The reduced end of the thrust blockreceives the thrust sleeve, thereby aligning th thrust sleeve in relation to the rod. Pressure is then applied to the ends of the old bushings in a direction parallel with the axis thereof by rotating the nut IS in a clockwise manner. As the pressure is increased, the old bushing will be extracted and a new one inserted.

The invention therefore exemplifies a bushing removing and replacing device; which enables expeditious operation in the replacing or removing of bushings without distortion or destrucnon of: the bushing, which was present in the old method of operation.

It will be understood, therefore, by those skilled in the art, that the embodiment of the invention herein disclosed accomplishes the principal ob- .iect of theinvention. It also has uses and ad'- vantages other than those herein particularly referred to. Also, that v rious changes and modifications maybe made without departing from the irit of the invention and'since the embodiment disclosed herein, being only illustrative of the device, the invention is not to be understood as restricted thereto, since this may be r l within the scope of the appended clairnswithout' departing from the spirit and scope of the invention.

Having thus described the invention; what is claimed as new and desired to secure by Letters Patent is:

1. A device for extracting old camshaft bushings and inserting new camshaft bushings in place of the old ones in a motor block, comprising a common guide means extending the entire length of the motor block, having one end portion threaded, an. adjusting nut on the threaded portion thereof, a plurality of reduced portions on said common guide means, said reduced portions being uniformly reduced and regularly spaced apart from each other so that one of said reduced portions will lie adjacent any bearing surface surrounding said guide means, each of said reduced portions being adapted to receive a horseshoe ring, together with a plurality of transverse openings through the guide means, said transverse openings being spaced apart from each other and positioned between said reduced portions and adapted to receive a cross pin, a thrust block shiftable upon the shaft in contact with said nut, said thrust block having an enlarged portion and a reduced portion, a thrust sleeve contacting said shiftable thrust block adapted to contact the base of said motor block, bushing holding member adapted to be moved longitudinally on said common guide means to any selected position relative to said reduced portions, said guide means adapted to keep said bushing holding member in alignment during operation, said bushing holding member provided with an enlarged portion for engaging one end of a bushing, an elongated portion of sufiicient length and diameter for fully accommodating and internally engaging and guiding a bushing which is engaging and extending from said enlarged portion, said horseshoe ring adapted to prevent the moving of said movable bushing member relative to said guide means and said cross pin adapted to prevent rotation of said guide means during the operation of the device.

A device ior exti-acti inserting new cainshait thereoi in a, motor block, con

the old bushings are in thra. ty of reduced portions on reduced portions being uniformiv 1' spaced apart one oi soace surround .lg said reduced portions being a to receive a horseshoe ring or washer t with a pinrality of transverse openings tliro the shaft, transverse openings being spaced from each other and positioned between said reduced portions and adapted to receive a cross pin, a

movable bushing-holding member adapted to be moved longitudinally on shaft, said shaft thereby adapted to keep said bushing-holding member in alignment during operation, said bushing-holding member provided with an enlarged portion for engaging one end of a bushing and an elongated portion of ufhcient length and diameter for fully accommodating and internally engaging guiding a bushing, horseshoe ring or washer adapted to prevent the moving or said movable bushing member relative to said shaft duringthe extracting of the oldbushing or the'inserticn of the new bushing and said cross pin adapted to be inserted in said shaitto prevent rotation thereof during the operation of the device;

PAUL G; RUTTEN.

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