US3589217A

US3589217A - Shaving machine for a crank pin

Info

Publication number: US3589217A
Application number: US833374A
Authority: US
Inventors: Masaaki Kobayashi; Tetujiro Kobayashi
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-06-20
Filing date: 1969-06-16
Publication date: 1971-06-29
Anticipated expiration: 1988-06-29
Also published as: DE1931410B2; GB1272682A; DE1931410A1; JPS4815196B1

Abstract

A portable shaving machine to rectify distortion and wear and tear of a crank pin and the like comprises a circular casing containing within it a worm rotated by a motor and a worm wheel which engages said worm, a circular rotor arranged in said worm wheel by means of a link and which has a shaving blade and a number of chucks which are arranged to draw the shaving blade to a crank pin, and a supporting frame to fix the casing. It can repair a distorted crank pin very simply without disassembling an engine to remove a deformed crank pin, which is particularly advantageous in case of a crank pin of the engine in a ship.

Description

. [22] Filed United States Patent [72] Inventors {45] Patented [32] Priority June 20, 1968 1 J p [31] 43/4313! [54] SHAVING MACHINE FOR A CRANK PIN 10 Claims, 8 Drawing Figs.

[52] US. Cl 82/4 B [51] lnt.Cl B23!) 5/16 [50] Field of Search i 1 i 82/4, 4.2 9

Primary Examiner-Leonidas Vlachos AltomeyDawson, Tilton, Fallon and Lungmus ABSTRACT: A portable shaving machine to rectify distortion and wear and tear of a crank pin and the like comprises a circular casing containing within it a worm rotated by a motor and a worm wheel which engages said worm, a circular rotor arranged in said worm wheel by means of a link and which has a shaving blade and a number of chucks which are arranged to draw the shaving blade to a crank pin, and a supporting frame to fix the casing. It can repair a distorted crank pin very simply without disassembling an engine to remove a deformed crank pin, which is particularly advantageous in case of a crank pin ofthe engine in a ship.

PATENTEB JUN29 |97l SHEET 1 BF 2 FIG] FIG.5

FIG.4

PATENTED JUN29 IBTi SHEET 2 BF 2' F/GZ SIIAVING MACHINE F011 A CRANK PM The present invention relates to a shaving machine of a crank pin, more particularly, a portable shaving machine to rectify distortion and repair wear and tear of a crank pin.

A crank pin in an engine will be gradually worn out with use, because the same place of a crank pin will be constantly subject to a shock of explosion of the engine through the intermediary ofa connecting rod, so that the crank pin will be worn out and distorted so as to become oval in cross section. As a result, a gap will be made in the joint between a crank pin and a connecting rod and there is an apprehension of seizure between a piston and a cylinder, because of an unsatisfactory oiling for the piston. Besides, the heat generated on that occasion is conducted to the connecting rod and the crank, entailing a scaling loss in the connecting rod or the crank. Furthermore, saidjoint becomes loose, which results in a break in the metal. Consequently, whenever a distortion and wear and tear exceed 0.1 mm., the crank pin must be repaired.

However, a conventional shaving machine of a crank pin is so constructed that the crank has to be removed from the engine in order to carry out a repairing work. For that reason, it has been necessary that, in order to shave a crank pin, the engine is disassembled and the crank has been conveyed to a repair shop equipped with a shaving machine, which requires a great deal of labor and a wasteful time of transportation into the bargain.

One of the objects of the present invention is to provide a simple shaving machine which can repair a crank pin to become completely round in cross section without removing it from an engine.

In short, the shaving machine of a crank pin according to the present invention comprises a circular casing containing within it a worm to be driven to rotate by means of an electric motor and a worm wheel which engages said worm, a circular rotor which is arranged in said worm wheel by means of a link which can freely swing, and which is provided in its inner circumference with a single shaving blade and a required number of chucks arranged so as to draw the shaving blade to the crank pin, and a supporting frame to firmly fix the casing, while all the worm wheel, the casing and the rotor can be opened in two parts respectively, and the transfer of the chucks and the shaving blade towards a center of the rotor can be freely adjusted, if required.

All the other characteristics, objects and advantages of the present invention will be clearly understood by reference to the attached drawings and from the following detailed description of its examples, wherein:

FIG. 1 is an elevation of a partly notched new shaving machine of the crank pin according to the invention.

FIG. 2 is a side view of a partly notched example shown in FIG. 1.

FIG. 3 is a section taken along line 3-3 of the example shown in FIG. 1.

FIG. 4 is an enlarged oblique view of a snap for a fixed chuck or a shaving blade.

FIG. Sis an oblique view of snap for a pressing chuck.

FIG. 6 is an enlarged section of FIG. 1 taken along line 6-6, and

FIG. 7 and FIG. 8 are diagrammatic explanatory view.

The shaving machine shown in FIGS. 1, and 2 and 3 is a desirous example of the present invention and it includes a circular worm wheel casing 5 which has a cylindrical worm casing at its head and the cross section of which is V-shaped. The worm wheel casing 5 consists of two

semicircular sections

5a and 5b, both of which are mutually combined by means of a hinge 6 at their respective one ends, while at their ends are respectively provided the

outside lugs

7 and 8 with a tapped hole 9 which is common to both of them. After these

lugs

7 and 8 are combined, the bolt 10 is screwed into the tapped hole 9 to form a circular. Into the casing 5 is inserted a circular worm wheel 2 which is provided with a flange 4 on its inner circumference, while said worm wheel 2 is separable into two semicircular sections 2a and 2b and their joint 3 is simply put together, but not combined. Into the casing 11 is inserted a worm I which is engaged with the worm wheel 2 and one 15a of its shaft 15 is received into a cover-shaped bearing 13 screwed into one opening of the casing 11 between the bearing of a worm shaft and the worm 1 by means ofa thrust bearing 16, and the other end 151) of the shaft 15 is projected long out of a barrel-shaped bearing 12 which is screwed into the other opening of the casing 11 between the bearing of a worm shaft and the worm 1 by means of a thrust bearing 14. It is combined with a flexible shaft, although not illustrated, and further connected to the motor, so that worm 1 may be driven by it.

Inside the worm wheel 2 is arranged a circular rotor 17 at a certain interval. It also consists of two

semicircular sections

17a and 17!), both of which are mutually combined by a hinge 18 at their respective one ends, while at the other ends of the

semicircular sections

17a and 17b are provided the

outside lugs

19 and 20 with a tapped hole 21 which is common to both of them. After these

outside lugs

19 and 20 are put together, the bolt 22 is screwed into the tapped hole 21 to form a circular. The inside lug 24 provided in the worm wheel 2 and the outside lug 25 made in the rotor 17 are gently fixed into the respective ends of a H-shaped link 23, and, with the aid of a pin 26, they are combined to freely swing. Inside the rotor 17 are respectively arranged two

fixed chucks

27 and 28 and the

pressing chucks

29 and 30, all of which are rod-shaped. The

fixed chucks

27 and 28 make a right angle with each other facing toward the center of the rotor 1'7, while the

pressing chucks

29 and 30 likewise make a right angle with each other facing toward the center of the rotor 17. In other words, the fixed chuck 27 and the pressing chuck 30 on the one hand and the fixed chuck 28 and the pressing chuck 29 on the other are oppositely facing each other respectively. Between the

pressing chucks

29 and 30 is arranged the shaving blade 31 making an angle of 45 and it is slightly longer than all the chucks 27 to 30 and is directed toward the center of the rotor 17. The shaving blade 31 is inserted into a shaving blade holder 32 which is U-shaped in cross section and which is fixed by a setscrew 33 put through it from its one side to the other, while from the bottom of said holder 32 is also put through an adjust screw 34, by means of which the projection of the edge of said shaving blade 31 can be freely adjusted. To the

pressing chucks

29 and 30 are provided legs 35 squarely shaped in cross section and making a right angle respectively, while to the

fixed chucks

27 and 28 and the shaving blade holder 32 are also arranged the legs 36 shaped squarely in cross section and making a right angle respectively, but their thickness is made slightly thinner than the legs 35. To the rotor 17 are made five grooves which have step sections 38 on their lateral sides and which are directed toward the center of the rotor 17, while the

legs

35 and 36 are fixed into the abovementioned places respectively. Into the tapped hole 40 made in the bottom part of the

legs

35 and 36 are screwed the adjust screws 39 respectively and round washers 41 are loosely fixed onto them so as to be caught by their heads 42 respectively.

As clearly seen by FIGS. 4 and 5, both the snap 43 for the pressing chuck and the snap for the fixed chuck and the shaving blade are L-shaped in cross section and their rectangular bent sections 43a and 44a are provided with a notched section 45, into which can be inserted the head 42 of a adjust screw 39, but, to the snap 44 are arranged in its inner side the projecting stripes 46 which can be fixed into the entrance section of the groove 37 and this face accounts for its difference from the aforesaid snap 43. The

snaps

43 and 44 are respectively put on the step sections on both sides of the groove 37 and their bent sections 43a and 44a are placed over the rotor 17 from its outside at a certain interval by means of a washer 41 and fixed by the bolt 47, but the washer 43 is fixed in such a way that it does not press down the legs 35, while the press chucks 29 and 30 can move in the groove 37 in the direction of a center of the rotor 17. On the other hand, the snap 44 presses down the leg 36 by means of its projecting stripe 46 and, after adjusting the chucks 2'7 and 28 and the shaving blade 31 by means of the adjust screw 39, it can be fixed to a predetermined position. Between the respective chucks 29 and and the inside of the rotor 17 is interposed a coil spring 48 to constantly press the

chucks

29 and 30 toward the direction of a center of the rotor 17. The fixed supporting frame 49 of a pair of casings, which are made to oppositely face with each other at a certain interval, consist of two symmetrical almost L-

shaped sections

49a and 49b, both of which are combined by means of a hinge 50 so as to be opened outward. To the upper end of the respective supporting frame 49, the lower screw rod support 51 is arranged so as to be in a body and it is connected to the upper screw rod support 52 by means of a hinge 53 so as to be opened upward, while on the sides of both screw rod supports 52 and 53 are provided longitudinal grooves 54, into which is inserted the bolt 55 from below and onto said bolt 55 is fixed a butterfly nut 56 from above, so that it can press down and catch the upper screw rod support 52. Over the front and rear screw rod supports 54 are laid two feed screw rods 57 in parallel which have a screw ditch made semicircular in cross section, and they are put into cylindrical sections 58 on both sides ofa worm wheel casing 5. into the cylindrical section 58 is screwed a bolt 58 and its tip is inserted into the screw ditch of a screw rod 57 so as to allow the screw rod 57 to rotate. Between the lower ends of the front and rear supporting frames 49 is inserted a jack which has an operation handle 62 in the center and steps 61 at both ends. The steps 61 can be made to go in and out by turning a central handle 62.

The shaving machine according to the present invention can be used in the following way: in order to shave and rectify a crank pin P arranged in an engine, the shaving machine is first disassembled entirely and then it is arranged and assembled on the crank pin P. For that purpose, the rotor 17 is divided into semicircular sections 17:: and 17b with a hinge 18 as a fulcrum and it is opened to be put over a crank pin P, while respective outside

lugs

19 and 20 are connected by means of a bolt 22. On that occasion, the shaving blade 31 and the

pressing chucks

29 and 30 are drawn in first and, after inserting the rotor 17, the adjust screw 39 is turned to push inward the

pressing chucks

29 and 30 and the crank pin P is lightly tightened. After arranging in this way, a gauge having a hexangle shape in cross section is placed on the rotor 17 and then, the worm wheel 2, which is divided into the semicircular sections 2a and 21.1 by dividing the worm wheel casing 5, with a hinge 6 as a fulcrum, into the semicircular sections 50 and b, is restored and, after laying all these sections over the rotor 17 from outside, the

outside lugs

6 and 7 are screwed down by a bolt 9. Besides, a required number of gauges is inserted, at a suitable interval, between the rotor 17 and the worm wheel casing 5, and a link 23 is respectively connected by a pin 26 to all the lugs 24 and. 25 of the worm wheel 2 and the rotor 17. After then, two feed screw rods 57 are put into the cylindrical sections 5 on both sides of the casing 5 and their both ends are once received on a lower rod supports 51. The jack 60 is then used to press a pair f the supporting frames 49 to the surfaces of crank arms A on both sides and fix them, while a upper rod supports 52 are closed and tightened by a bolt 55 and a butterfly nut 56. After then, the gauge is removed and the worm shaft is connected to the motor arranged outside the engine by means of a, flexible shaft.

Both the worm wheel 3 and the rotor 17 are circular, but the latter is made to be free within the former and, since the chucks 27 to 30 arranged in the rotor 17 and the shaving blade 31 can be put to the crank pin P as a main body, a centering can be made easily and without fail. If the rotor 17 is fixed to the worm wheel 2 and cannot be shifted, the rotor 17 will be pulled to one side and centering cannot be made exactly, when the casing 5 is not supported rightly. in fact, since fixing is carried out in a narrow crank ase, it is difficult to correc ly support and fix the casing 5.

As soon as the abovc=rnentioned fixing is completed, the crank pin P will be shaved in the following way: the rotation of a worm i is transmitted to the rotor 17 through the intermediary of the worm wheel 2 and the link 23 and, as shown by an arrow mark in FIG. 1, the rotor 17 will rotate clockwise. However, the rotor 17 is first rotated two or three times, while drawing in the shaving blade 31, so that the tension test of a spring 48 of the

pressing chucks

29 and 30 is made to keep it appropriate by the adjust screw 39. The shaving blade 31 is then pushed out inward by means of the adjust screw and fixed just this side of the point where the shaving blade 31 hits against the crank pin P. On that occasion, the shaving blade 31 will be so positioned that it can shave the pin P from its deformed convex section or not yet abraded section x (See P16. 7). After arranging in this way, the rotor 17 is made to rotate and its appropriate speed of revolution is 450 to 500 rpm. The pressing chucks 29 and 30 advances and retreats in correspondence to a distortion of the crank pin P to the extent of a gap between the rotor 17 and a bent section 43a of a snap 43. However since the tension of a spring 48 is constantly at work, the fixed

chucks

27 and 28 are drawn to the crank pin P. Consequently the shaving blade 31 is forced to press against the crank pin P. As a result, when the rotor 17 is turned clockwise and the shaving blade 31 comes to a deformed convex section x, it will shave that section as shown by FIG. 8. But, there are gaps in other sections. if the shaving blade 31 is gradually pushed out, the deformed convex section x will be shaved by degrees. When there will be no gap in any point between the shaving blade 31 and the crank pin P, the rotor 17 will be stopped. At this point, the circular arc of a crank pin P will show the same curvature everywhere and it becomes a complete round.

When the length of the crank pin P and that of the shaving blade 31 are the same, shaving can be made completely. But if the crank pin P is longer than that of the shaving blade 31, the feed screw rod 57 will be turned to make the worm wheel casing 5 to be screwed forward and shaving will be carried out repeatedly in a manner as mentioned above. As shown in FIG. 3, the shaving blade 31 is longer than the chucks 27 to 30 by a distance L in the turning direction of the rotor 17 shown by an arrow mark in FIG. 3. Therefore, the chucks 27 to 30 will move in an arrow direction along the circumference of the chucks 27-30 which are shaved by the shaving blade 31 to become a complete round, so that a rectifying shaving can be carried out with no change in the axial center of the crank pin P. Needless to mention, the shaving blade 31 is drawn in on this occasion. Besides, although the feed screw rod 57 is turned manually by catching the head at its end by a monkey spanner, it can be rotated automatically, if desirable.

in the above-mentioned example of the invention, the fixed

chucks

27 and 28 on the one hand and the

pressing chucks

29 and 30 on the other hand are arranged on the rotor 17 to make a right angle with each other, while the shaving blade 31 is also arranged to make an angle of 45 with the

pressing chucks

29 and 30 respectively. But, such an arrangement is nothing but an example, and there can be various arrangements. in addition, there are cases where neither a pressing chuck nor a fixed chuck is required.

The shaving machine according to the present invention is portable, and the crank pin can be repaired, while the crank remains fixed to an engine, which is particularly advantageous in case of ships. in other words, when a distortion is found in the crank pin of a conventional engine, it has been necessary to bring a ship to a dock or a repairing wharf to disassemble the engine and to break a part of the hull to fetch the crank pin to a land factory, in contrast to which, the shaving machine according to the invention can be attached to the crank pin by opening a crank case window in order to shave and rectify the crank pin. As a result, the crank pin can be repaired very simply when a ship is at a cargo working or waiting offshore.

Besides, the shaving machine according to the present invention can be utilized when shaving not only the crank pin of an engine, but also all kinds of crank pins inclusive of compressors as well as peripheries of sharts and pipes etc.

What we claim is:

l. A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor within the worm wheel, link means connecting the rotor and the worm wheel,,a shaving blade mounted on the rotor, and a plurality of chucks mounted on the rotor and arranged to urge the shaving blade toward the crank pin, each of the worm wheel, casing, and rotor being formed in two sections to permit opening thereof.

2. The shaving machine of claim 1 wherein the chucks in clude two fixed chucks and two pressing chucks provided with a spring, each of the chucks being arranged on the inner circumference of the rotor and extending toward the center of the rotor, the chucks being spaced apart about 90 along the circumference of the rotor, the shaving blade extending between the two pressing chucks.

3. The shaving machine of claim 1 including a supporting frame for the circular casing, the supporting frame being formed in two sections to permit opening thereof.

4. The shaving machine of claim 1 in which each of the cas ing and rotor are formed from a pair of semicircular sections which are hingedly secured.

5. A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor within the worm wheel and pivotally connected to the worm wheel by a link which can swing freely, a shaving blade ad justably mounted on the rotor and extending inwardly beyond the inner circumference of the rotor, a plurality of chucks adjustably mounted on the rotor and extending inwardly beyond the inner circumference of the rotor and arranged to draw the shaving blade toward the crank pin, the shaving blade extending inwardly beyond the chucks, a support frame supporting the casing, and transferring means for moving the casing axially with respect to the crank pin, each of the worm wheel, casing and rotor being formed of two parts to permit opening thereof.

6. The shaving machine of claim 5 wherein the transferring means comprises a rotary screw rod threadedly engaged with the casing and rotatably supported by the frame.

7. The shaving machine of claim 6 including a bolt secured to the casing and extending between threads of the screw rod to providethe threaded engagement between the screw rod and the casing.

8. The shaving machine of claim 5 wherein the supporting frame includes a pair of spaced-apart frame portions, the cats ing being positioned between the frame portions, and jack means extending between the frame portions for forcing the frame portions away from each other.

97 A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor, link means connecting the rotor and the worm wheel, a shaving blade mounted on the rotor, a plurality of chucks mounted on the rotor and arranged to draw the shaving blade toward the crank pin, a pair of spaced-apart supporting frames, the casing being supported between the frames, transferring means mounted on the frames and engaging the casing for moving the casing toward and away from the supporting frames, and a jack extending between the supporting frames for moving the supporting frames away from each other.

10. A shaving machine for a crank pin comprising a circular casing within which are supported a worm adapted to be rotatably driven by an electric motor, a. worm wheel which cngages the worm, a circular rotor connected to the worm wheel by an elongated link, one end of the link being pivotally secured to the worm wheel and the other end of the link being pivotally secured to the worm wheel and the other end of the link being pivotally secured to the rotor, a pair of pressing chucks mounted on the rotor for radial movement, a spring on each of the pressing chucks for urging the chucks radially inwardly with respect to the rotor, a shaving blade mounted on the rotor equidistant between the pressin chucks, a fixed chuck mounted on the rotor opposite eac of the pressing chucks, a pair of supporting frames supporting the casing therebetween, a feed screw rod extending between the supporting frames and engaging the casing for moving the casing toward and away from the supporting frames, ajack extending between the supporting frames, each of the worm wheel, cas ing and rotor being formed by a pair of generally semicircular portions to permit opening thereof, the semicircular portions of the casing and rotor being hingedly secured.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,589,217 Dated J ne 29, 1971 Inventor(s) Masaaki Kobayashi and Tetujiro Kobayashi It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In claim 10,

lines

26 and 27, please delete "and the other end of the link being pivotally secured to the worm wheel" Signed and sea led this 23rd day of November 1971 (SEAL) Attest:

ROBERT GOTTSCHALK EDWARD M.FLETCHER,JR.

Acting Commissioner of Patents Attesting Officer FORM PO-IOSO (10-69) USCOMM DC 603764;; a u s sovznnmem rnumuc OFFICE I969 o-asu-au

Claims

1. A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor within the worm wheel, link means connecting the rotor and the worm wheel, a shaving blade mounted on the rotor, and a plurality of chucks mounted on the rotor and arranged to urge the shaving blade toward the crank pin, each of the worm wheel, casing, and rotor being formed in two sections to permit opening thereof.

2. The shaving machine of claim 1 wherein the chucks include two fixed chucks and two pressing chucks provided with a spring, each of the chucks being arranged on the inner circumference of the rotor and extending toward the center of the rotor, the chucks being spaced apart about 90* along the circumference of the rotor, the shaving blade extending between the two pressing chucks.

4. The shaving machine of claim 1 in which each of the casing and rotor are formed from a pair of semicircular sections which are hingedly secured.

5. A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor within the worm wheel and pivotally connected to the worM wheel by a link which can swing freely, a shaving blade adjustably mounted on the rotor and extending inwardly beyond the inner circumference of the rotor, a plurality of chucks adjustably mounted on the rotor and extending inwardly beyond the inner circumference of the rotor and arranged to draw the shaving blade toward the crank pin, the shaving blade extending inwardly beyond the chucks, a support frame supporting the casing, and transferring means for moving the casing axially with respect to the crank pin, each of the worm wheel, casing and rotor being formed of two parts to permit opening thereof.

7. The shaving machine of claim 6 including a bolt secured to the casing and extending between threads of the screw rod to provide the threaded engagement between the screw rod and the casing.

8. The shaving machine of claim 5 wherein the supporting frame includes a pair of spaced-apart frame portions, the casing being positioned between the frame portions, and jack means extending between the frame portions for forcing the frame portions away from each other.

9. A shaving machine for a crank pin comprising a circular casing, a worm rotatably mounted within the casing, a worm wheel within the casing engaging the worm, a circular rotor, link means connecting the rotor and the worm wheel, a shaving blade mounted on the rotor, a plurality of chucks mounted on the rotor and arranged to draw the shaving blade toward the crank pin, a pair of spaced-apart supporting frames, the casing being supported between the frames, transferring means mounted on the frames and engaging the casing for moving the casing toward and away from the supporting frames, and a jack extending between the supporting frames for moving the supporting frames away from each other.

10. A shaving machine for a crank pin comprising a circular casing within which are supported a worm adapted to be rotatably driven by an electric motor, a worm wheel which engages the worm, a circular rotor connected to the worm wheel by an elongated link, one end of the link being pivotally secured to the worm wheel and the other end of the link being pivotally secured to the worm wheel and the other end of the link being pivotally secured to the rotor, a pair of pressing chucks mounted on the rotor for radial movement, a spring on each of the pressing chucks for urging the chucks radially inwardly with respect to the rotor, a shaving blade mounted on the rotor equidistant between the pressing chucks, a fixed chuck mounted on the rotor opposite each of the pressing chucks, a pair of supporting frames supporting the casing therebetween, a feed screw rod extending between the supporting frames and engaging the casing for moving the casing toward and away from the supporting frames, a jack extending between the supporting frames, each of the worm wheel, casing and rotor being formed by a pair of generally semicircular portions to permit opening thereof, the semicircular portions of the casing and rotor being hingedly secured.