US2447117A

US2447117A - Portable crank journal grinder

Info

Publication number: US2447117A
Application number: US647029A
Authority: US
Inventors: Walter F Emory
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-02-12
Filing date: 1946-02-12
Publication date: 1948-08-17
Anticipated expiration: 1965-08-17

Description

Aug. 17, 1948. w. F. EMORY 2,447,117

PORTABLE CRANK JOURNAL GRINDER Filed Feb. 12, 1946 3 Sheets-Sheet l Fig.5.,

M/fiL TEE F fMo/e Y.

Aug, 17, 1948. w. F. EMORY PQRTABLE CRANK JOURNAL GRINDER 5 Sheets-Sheet 2 Filed Feb. 12, 1946 2 H441 TEE F 517012 4 I gdfumrg Aug. 17, 1948.. w. F. EMORY 2,447,117

PORTABLE CRANK JOURNAL GRINDER Filed Feb; 12, 1946 3 Sheets-Sheet 3 Patented Aug. 17, 1948 UNITED STATES PATENT OFFICE 2,447,117: PGRTABLE CRANK JOURNAL GRINDER Walter F. Emory, Arbutus, Md. Application February 12, 1946, Serial No. 647,029

5 Claims.

This invention relates to the preparation of machinery for accurate alignment, and more particularly to the grinding of crank shafts to align with the bore of the cylinders and main bearings without removing the crank shaft from its main bearings.

The grin-ding of a crank shaft to make it round accurately is conventionally accomplished by the use of a grinding machine especially built for receiving the crank shaft and revolving it so the specific bearing tobe ground will be rotated on its axis, an abrasive wheel is rotated against the surface of the bearing until the grinding is completed. Using the conventional method explained herein the crank shaft must be removed from its engine bearings. placed in the grinder to suit the throw of the bearing to be ground, then removed and replaced in-the engine or other device from which it wasremoved. Grinding an eccentricby this method aligns the various bearings of the crank shaft with each other but does not align the bearings with the bore of the cylinders.

In a particular form of this invention, the grinding of crank shafts to be repaired, especially those of a peculiar type, such as those emanating eccentrically from a bearing, is pursued by employing a motor operated grinding Wheel of suitable texture actuated through an extended quill shaft and held to the shaftbearing to be 1 ground at one end and pivotably attached to a pistonwhich reciprocates in the cylinder at theother. The arrangement rotates the crank shaft and the quill shaft induces the abrasive wheel to grindthe peripheralsurface-of the eccentric shaft on an axis at right angles to that of the shaft to be repaired. At the same tim any grindings ordust involved are evacuated in a very effective and convenient manner.

It is an object of the present invention to provide a new and improved form of'shaft grinding unit that will avoid one or more of the disadvantages and limitations of the prior art;

An additional object of the invention is to'provide a new andimproved shaft grinding unit that may be applied to shafting difficult to get'at byreason of their structural positions in their equipment', and accomplish the grinding accurately, conveniently and effectively.

- A further object of this invention is to provide anew and'improved shaft grinding unit that will be adapted to remove the grindings arising during the operation, in an effective and safe manner without interfering or diminishing the operational effectiveness ofthe grinding: functions.

Still another object of the invention is to provide a new and improved shaft grinding unit, that can be effectively utilized on crank shafts without dismantling them, from their parent equipment for the purpose.

In order to illustrate and for other objects reference is made to the appended drawings and following specifications wherein a particular form of sented by way of example, while the claims are particularly worded to set out the invention.

Referring to the drawings:

Figure l is a side elevation of the crank shaft grinder embodying this invention,

Figure 2 is a front view of Figure 1,

Figure 3 is an enlarged View showing the longi-- tudinal abrasive wheel feed and vacuum lines,

with parts broken away to show its construction; Figure 4 is a sectional View taken along line' l--4 of Figure 3,

Figure 5 is a sectional view taken along line 5-5 of Figure 4.

Figure 6 is an enlarged front view of the crank grinding end,

Figure '7 isan enlarged side View of Figure 6,

Fi ure 8 is a sectional View taken along line 8B'of Figure '7, and

Figure 9 is a sectional view taken along line 9-9 of Fig. 1.

Similar reference characters refer to similar parts throughout the drawings.

In the particular form indicated in the drawings, a portable grinding unit is shown processing the bearing surfaces of an engine shaft to' bring them down to an accurate roundness or circularity. The bearingv surfaces indicated are those derived at the crank portion and connection.

The engine shaft is designated as ID, with its crank structure I l and its crank bearing shaft as l2. The bearing shaft !2 is the one to be ground to size and roundness by the invention, and is revol'ved'by the engine or some motor without removal from its main bearings or general placement' in the engine.

The. grinding unit comprises a shaft engaging shieldthatlocks over the crank bearing l2 to be ground. The shield is made in split halves suitably bolted together, so it may be slipped over the shaft while in place on the engine. The halves are'provided'with wedges or plungers 14 that adjustably contact with the peripheral surface of the shaft and align the unit properly in regard to it for grinding. Felt pieces I3 are used for win-- ing' grindings from the shaft and for lubricating the bracket plates 55. The upper half l5 of the the invention explicitly the invention is pre-' 3 shield adjusts in the vertical direction to and from the shaft. The adjustment is made by hand and operated by the wheel or handle l8. The shield is preferably provided with transparent moveable windows 24. The shield is welded to a tubular quill casing IQ of relatively large diameter. A quill shaft is secured to the grinding wheel l6 and rotates when turned by a motor 2| distantly connected to it. The quill shaft 20 is journalled in the feed mechanism using a ball bearing element 22. Conventional means are used to hold the Wheel in place. The abrasive wheel I6 is preferably flat and disc-like and sets tangentially to the shaft l2 that it is to grind. The quill shaft 20 runs within a close fitting quill housing 23 which is of tubular cross section and rests on the mechanism I1 and tensioned by spring 68. Spaced around the quill housing 23 is a tubular quill casing l9 that is attached to the upper half i5 of the shield at its lower end and to the saddle 25 at the upper flange 26. The spacin 28 between the quill housing and the quill casing is sufiicient to provide a duct of ample area to permit an evacuating fiow through it under the action of a vacuum pump 21. The saddle is held on coiled springs 29 and bolts 30 and affords a resilient support for the unit. The spring 3| positioned between the duct closing washers 32 and the supporting saddle 25 acts as an absorber and frictional resistance to the movement of the Washers as the lateral adjusting mechanism 34 reciprocates the quill shaft and quill housing within the casing. The mechanism 34 actuates manually and is operated by gearing 35 and the shaft 36. Limit stops 48 adjusted by screw threaded arrangement serve to control the travel of the adjustment of the mechanism 34. A suspension structure 31 supports the motor 2| from the bell and flange 38 mounted on the upper end of the quill housing. The bell is interiorly large enough to include a series of spring washers 39 and ball bearings 40 to take up the vertical expansion and thrust, and acts as a buffer under a coupling 4| that connects the shaft 42 of the motor 2| to the quill shaft 20. The motor is supplied with electrical service through wiring 62 in any suitable manner. The spacing 28 is evacuated through the side ducts 43 which are depressed at 33 to allow the motor to move from side to side as the quill housing is moved in the quill casing to feed the abrasive wheel across the bearing to be ground. The side ducts 43 are connected to flexible piping 44 that runs to the vacuum pump 21 and tank. The weight of the unit during operation is minimized by a counter weight 45 attached to the cables 46 running over pulley 41 supported from above the unit. In order to take up the eccentric motion of the crank shaft as the crank is rotated on its axis, a special piston 50 is used in the cylinder of the engine, in place of the original one and its connecting rod. The piston 50 is provided with a trunnion which acts as a cross-head so that the grinding mechanism can oscillate therein like a connecting rod and cause the crank bearing to be ground in proper alignment with the bore of the cylinder. The piston 50 and trunnion 5| are connected with the quill casing l9. The unit is intended to grind crank bearings while the crank shaft of an engine 10 or the like is still in position and without disassembling or dismantling same from it, only the original piston and connecting rod has to be displaced during the grinding by the grinder unit. During the process of grinding on the crank bearing the piston 50 with its trunnion and housing parts and motor reciprocate in the cylinder of the engine in place of its piston and connecting rod, and simulates its action with regard to the crank shaft and crank bearing. This assures a grinding that follows actual operating conditions accurately, and produces a bearing that is axially correct. A pair of bracket plates preferably comprise the side walls of the shield Darts I5 and i6 and are used to enclose the ends and to provide bearing surfaces that ride on the fillets of the crank bearing I2 to be ground during the first part of the operation. The lower portion of the bracket plates 55 are provided with slots 56 to allow the edge of the abrasive wheel It to project through the slot and grind a fillet at each side where the reground surface of the crank bearing 2 meets a crank structure ll of the engine shaft Ill. The bracket plates 55 are tied together by spacers 54. One of the upper spacers 54 is used to support a removable diamond 52 held by a spring member 53 and serves to keep the grinding wheel I 6 in shape for its use, and is used whenever the wheel is to be dressed.

The operation of the device is relatively imple. The piston and connecting rod is removed from the engine. The shield is attached to the crank bearing to be ground, the bracket plates 55 are positioned on the fillets, while the grinding unit is suspended and counterbalanced by the weight. Adjustment is made through the wheel or handle It! to bring the wheel l6 against the crank bearing i 2 to be ground round, The motor 2| is started and through the coupling 4| rotates the quill shaft 20 and grinding wheel IS. The mechanism 34 is actuated and causes the quill housing and quill shaft to reciprocate back and forth parallel with the axis of the crank bearing face in a slow but regular movement during the time that the grinding continues. The engine shaft I 0 is revolved at about 6 R. P. M. during the time the .crank bearing is being ground. As the dust and grindings accumulate they are drawn up into the spacing 28, thence up through the

ducts

43 and 44 by a suction pump and discarded. At suitable intervals the operator moves the feed mechanism I1 slight amounts to grind and keep adequate contact with the periphery of the crank bearing l2. 'During this work, the Various vibrations and stresses arising in the device are taken up by the various springs mentioned. The counterweight creates a balance which takes up the weight of the grinding unit and so improves the operation of the grinding wheel that it can grind with very close tolerances. In practice this has been found to be up to .00025 of an inch, whereas using the same machine without the counterbalance the tolerance was .005 of an inch. When the crank bearing has been ground, the wheel I6 is raised and the removable diamond 52 through its spring member 53 is attached to the spacer 54. The revolving wheel I6 is rotated back and forth across the diamond until its face is trued, the diamond is then removed. The roller bearings 51 and the wedges or plungers |4 operate under tension and may be tightened to take up the bearing of the grinding unit so the grinding wheel may be projected beyond the edges of the bracket plates and grind the fillets in alignment with the face of the crank bearings. The shield is then parted and the grinding unit removed from the engine cylinder and moved to the next operation.

While but one general form of the invention is shown in the drawings and described in the specifications it is not desired to limit this application to this particular form or in any other way otherwise than limited by the scope thereof, as it is appreciated that other forms could be made that would use the same principles and come Within the scope of the appended claims.

Having thus described the invention what is claimed is:

l. A grinding unit for cylindrical surfaces comprising, a shield adapted to encompass said surfaces, means for adjustably attaching the shield to said surfaces, a quill casing connected with the shield and extending therefrom in a predetermined directional manner, a saddle mounted on the casing, a quill housing within the quill casing and spaced therefrom to provide an evacuating duct therebetween, a quill shaft longitudinally disposed within said housing and having its operating head located adjacent the surfaces and adapted to hold a grinding wheel for processing same, mechanism mounted on the casing and coupled to said quill shaft for actuating same, and mechanism for creating a travel of the head over the surface to be ground and means for drawing the contaminated air from within said duct.

2. A grinding unit for cylindrical surfaces con-- prising, a shield adapted to encompass said surfaces, means for adjustably attaching the shield to said surfaces, a quill casing of tubular form connected with the shield and extending therefrom in a predetermined directional manner, a saddle mounted on the casing, a quill housing adjustable within the casing and spaced therefrom to provide an evacuating duct therebetween, a quill shaft longitudinally disposed within said housing and having its operating head located adjacent the surfaces and adapted to hold a grinding wheel for processing same, mechanism mounted on the Casing and coupled to said quill shaft for actuating same, mechanism for creating a travel of the head over the surface to be ground, and means for supporting the unit and counterbalancing portions thereof, to control the operable effect of the grinding wheel on said head.

3. A grinding unit for cylindrical surfaces comprising, a shield adapted to encompass said surfaces, means for adjustably attaching the shield to aid surfaces, a quill casing of tubular form connected with the shield and extending therefrom in a predetermined directional manner, a saddle mounted on the casing, a quill housing adjustable within the casing and spaced therefrom to provide an evacuating duct therebetween, a quill shaft longitudinally disposed within said housing and having its operating head located adjacent the surfaces and adapted to hold a grinding wheel for processing same, mechanism mounted on the casing and coupled to said quill shaft for actuating same, mechanism for creating a travel of the head over the surface to be ground, means for supporting the unit and counterbalancing portions thereof to control the operable effect of the grinding wheel on said head, and means for actuating the unit and guiding it in conformity with the operable movement of said surface during its operation within the equipment.

4. A grinding unit for cylindrical surfaces comprising, a shield adapted to encompass said surfaces, means for adjustably attaching the shield to said surfaces, a quill casing of tubular form connected with the shield and extending there- 'rcm in a predetermined directional manner, a saddle mounted on the casing, a quill housing adjustable within the casing and spaced therefrom to provide an evacuating duct therebetween, a quill shaft longitudinally disposed within said housing and having its operating head located adjacent the surfaces and adapted to hold a nding wheel for processing same, mechanism unted on the casing and coupled to said quill .1 aft for actuating same, mechanism for creating 9 travel of the head over the surface to be ground, lalpanf} for supporting the unit and counterbalancing portions thereof to control the operable effect of the grinding wheel on said head, means o actuating the unit and guiding it in conformity h the operable movement of said surface durits operation within the equipment, and means said shield for permitting a visual inspection he interior thereof and the surfaces encomsse-cl therein being processed.

5. A grinding unit for use with crank shaft comprising, a shield adapted to encompass said crank shaft surfaces, means for adjustably attaching the shield to said surfaces, a quill casing of tubular form connected with the shield and extending therefrom in a predetermined directional manner, a saddle mounted on the casing,

. .iill housing adjustable within the casing and ced therefrom to provide an evacuating duct 'ebetween, a quill shaft longitudinally dised within said housing and having its operathead located adjacent the surfaces and adaptto hold a grinding wheel for processing same, mechanism mounted on the casing and coupled to said quill shaft for actuating same, mechanism for creating a travel of the head over the surface to be ground, means for supporting the unit and counterbalancing portions thereof to control the operable effect of the grinding wheel on said head, mean for actuating the unit and guiding it in conformity with the operable movement of said surface during its operation within the equipment, means in said shield for permitting a visual inspection of the interior thereof and the surfaces encompassed therein being processed, and means for conducting the air from the evacuating duct to an extraneous locus.

WALTER F. EMORY.

REFERENCES CITED he following references are of record in the file of this patent:

UNITED STATES PATENTS