WO2002066202A1 - Outil permettant le montage de clavettes de soupape - Google Patents

Outil permettant le montage de clavettes de soupape Download PDF

Info

Publication number
WO2002066202A1
WO2002066202A1 PCT/US2001/005170 US0105170W WO02066202A1 WO 2002066202 A1 WO2002066202 A1 WO 2002066202A1 US 0105170 W US0105170 W US 0105170W WO 02066202 A1 WO02066202 A1 WO 02066202A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
plunger
valve stem
tool
lock
Prior art date
Application number
PCT/US2001/005170
Other languages
English (en)
Inventor
Harry A. Wouters
Andrew L. Levy
Original Assignee
Wouters Harry A
Levy Andrew L
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US09/394,483 priority Critical patent/US6219896B1/en
Priority claimed from US09/394,483 external-priority patent/US6219896B1/en
Priority to US09/733,749 priority patent/US6473965B2/en
Priority claimed from US09/733,749 external-priority patent/US6473965B2/en
Application filed by Wouters Harry A, Levy Andrew L filed Critical Wouters Harry A
Priority to PCT/US2001/005170 priority patent/WO2002066202A1/fr
Priority to EP01910891A priority patent/EP1365885A1/fr
Publication of WO2002066202A1 publication Critical patent/WO2002066202A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/24—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/24—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves
    • B25B27/26—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves compressing the springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49302—Repairing, converting, servicing or salvaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53552—Valve applying or removing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53552—Valve applying or removing
    • Y10T29/53557—Engine valve unit puller or applier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53796—Puller or pusher means, contained force multiplying operator
    • Y10T29/53817—Valve stem pin or key and another member

Definitions

  • the present invention is in the field of automotive mechanics and specifically relates to a tool for installing valve locks on a valve stem.
  • the valve lock removably secures a valve retainer to the valve stem.
  • the tool typically would be used by an automobile mechanic or by an engine reconditioner.
  • valves of a conventional internal combustion engine are forced shut by the high pressure within the cylinder.
  • the valves To implement the intake and exhaust cycles, the valves must be opened at appropriate times, and this is usually accomplished by the use of a cam that pushes against the end of the valve stem, thereby forcing the head of the valve into the combustion chamber.
  • a valve spring urges the valve to its closed position, and the cam must overcome the urging of the valve spring to open the valve.
  • the valve spring is a compression spring.
  • One end of the compression spring bears against a stationary part of the engine, and the other end of the spring bears against a valve spring retainer that is removably secured to the valve stem by a valve lock. Were it not for the valve lock, the compressive force of the valve spring would push the retainer off the end of the valve stem.
  • the retainer must be removably secured to the valve stem to permit assembly and dis-assembly of the valve.
  • the retainer has a tapered central bore that opens toward the end of the valve stem.
  • the valve stem has an end portion that includes a circumferential groove.
  • the valve lock is a tapered split collar that has an inwardly facing ridge. The ridge engages the circumferential groove of the valve stem and is held in engagement by the taper of the central tapered bore of the retainer. The valve lock is thus jammed between the circumferential groove on the valve stem and the tapered central bore of the retainer, which is urged toward the end of the valve stem by the valve spring.
  • valve locks are rather small in comparison to the valve stem and are difficult to manipulate.
  • the valve spring and the retainer are frequently located in a poorly-illuminated and fairly close-fitting recess, which makes the parts somewhat inaccessible.
  • Large console-type machines are commercially available, but they merely compress the valve springs. They occupy valuable floor space in the shop, and have a high initial cost. It appears that a need exists for a hand tool to facilitate the installing of valve locks.
  • the present invention is a hand tool to facilitate the installation of a valve lock into a circumferential groove on a valve stem.
  • the tool includes a loader end cap having an end that faces the valve spring retainer when the tool is in use and further includes a central bore extending in the direction of the axis of the valve stem when the tool is in use.
  • a plunger extends through this bore and protrudes beyond the end of the loader end cap. The plunger is biased toward the valve stem and has the same diameter as the valve stem.
  • the valve locks are placed by the user on the protruding cylindrical surface of the plunger, and the axis of the plunger is brought into alignment with the axis of the valve stem.
  • valve spring retainer gradually depressing the retainer by compressing the valve spring, and the end of the valve stem makes contact with the protruding end of the plunger.
  • the valve stem forces the plunger back into the loader end cap, and the valve locks are pushed onto the valve stem by the loader end cap.
  • the valve locks engage the circumferential groove on the end portion of the valve stem, and as the tool is withdrawn, the retainer advances toward the end of the valve stem also engaging the valve locks and preventing them from coming out of the circumferential groove.
  • the tool of the present invention permits the valve locks to be installed in a valve in approximately 15 seconds per valve, which is one-third to one-quarter of the time previously required, depending on the mechanic.
  • the hand tool of the present invention occupies no floor space in the shop, and costs only about one- tenth of the cost of the large console-type machines currently on the market. The operation of the tool as well as its construction will be described in detail in the following paragraphs with the help of the accompanying drawings.
  • the drawings show a preferred embodiment of the invention, but should not be regarded as limiting the scope of the invention.
  • Figure 1 is a side elevational view partly in cross section showing a type of valve assembly used in the prior art
  • Figure 2 is a side elevational exploded view partly in cross section showing the removal of the valve locks from the valve stem following compression of the valve spring in the prior art assembly of Fig. 1;
  • Figure 3 is a front perspective view of a valve lock of a type used in the prior art and shown enlarged relative to Figs. 1 and 2;
  • Figure 4 is a perspective view showing a preferred embodiment of the hand tool of the present invention.
  • Figure 5 is a fractional side elevational view partly in cross section showing a valve assembly and the tool of the present invention after the tool has been prepared for use but before the tool has been applied to the valve assembly;
  • Figure 6 is a fractional side elevational view partly in cross section showing the tool and the valve assembly at the instant when the end of the valve stem first makes contact with the end of the plunger of the tool;
  • Figure 7 is a fractional side elevational view partly in cross section showing the tool and the valve assembly after the tool has been used to push back the valve retainer to a greater extent than in Fig. 6, and in which the valve locks have been pushed onto the valve stem;
  • Figure 8 is a fractional side elevational view partly in cross section showing the tool and the valve assembly after the valve retainer has been pushed back to a greater extent than in Fig. 7, and in which the valve locks have become seated in the circumferential groove of the valve stem;
  • Figure 9 is a fractional side elevational view partly in cross section showing the tool and the valve assembly as the tool is being withdrawn from the valve assembly;
  • Figure 10 is a fractional side elevational view partly in cross section showing the tool and the valve assembly with the tool further withdrawn than in Fig. 9 and in which the valve spring retainer engages the valve locks;
  • Figure 11 is a fractional side elevational view partly in cross section showing the tool and the valve assembly after the tool has been withdrawn from the valve assembly; and, Figure 12 is a fractional side elevational view partly in cross section and enlarged, showing a preferred embodiment of the tool in greater detail.
  • Figure 1 shows a typical valve assembly of a type used in a contemporary internal combustion engine.
  • the head 12 of the valve forms a movable portion of the wall 14 of the combustion chamber 16.
  • Figure 1 shows the valve in its closed position, and the valve opens when it is moved in the direction indicated by the arrow. This motion is produced by a cam (not shown) that bears against the end 18 of the valve stem 20.
  • valve spring 22 which is a compression spring.
  • One end 24 of the valve spring bears against a fixed portion 26 of the engine.
  • the other end 28 pushes against the valve spring retainer 30 which is attached to the valve stem 20.
  • valve spring retainer 30 is removably attached to the valve stem 20 by two valve locks 32 and 34, which are shown diagrammatically in Figure 2; a single valve lock is shown greatly enlarged and in full detail in Figure 3. As best seen in
  • each valve lock includes a cylindrical inwardly-facing surface 36, a tapered outwardly-facing surface 38, and a ridge 40 that protrudes inwardly from the surface 36.
  • the valve stem 20 includes an end portion 42 into which a circumferential groove 44 has been formed.
  • the valve spring retainer 30 includes a tapered central bore 46.
  • FIG 1 shows the valve stem 20, the valve locks 32 and 34 and the valve spring retainer 30 in their normal assembled configuration.
  • the valve spring retainer 30 is shown drawn back from the end 18 of the valve stem to permit removal of the valve locks 32 and 34 and subsequent dis-assembly of the valve spring retainer 30 and the valve spring 22.
  • valve spring is quite stiff and cannot be compressed sufficiently by mere finger pressure to permit the valve locks to be disengaged.
  • valve locks are relatively small, on the order of 6 millimeters in length and 8 millimeters in diameter. The combined result of these factors is to make it difficult to disassemble and to re-assemble the valve assembly.
  • the present invention is a lightweight hand-held tool that is adapted not only to compress the valve spring, but also to set the valve locks into engagement with the circumferential groove of the valve stem.
  • Figure 4 shows an external view of the tool of the present invention, and Figures 5-11 show successive stages in its operation.
  • FIG 4 is a perspective view showing the exterior of the hand tool of the present invention.
  • the tool includes a handle 48 affixed to a hollow body 50 having an end 52 and a central axis 54.
  • a knob 56 is used for adjusting the tool and in replacing certain internal parts to adapt the tool for use with various engines.
  • the knob 56 is attached to a threaded bolt (not shown in Fig. 4) that extends through the slot 58.
  • Figure 5 shows the components of the valve assembly discussed above as well as certain essential elements of the tool. These include the hollow body 50, a loader end cap 60 affixed to the hollow body 50, having a central bore 62, and having an end 64.
  • a plunger 66 having a head 70 also includes a cylindrical body 68 that extends through the central bore 62 of the loader end cap 60 and fits therein in a loose sliding fit. When the head 70 of the plunger is in contact with the loader end cap, as in Figures 5 and 6, an end portion 72 of the plunger extends beyond the end 64 of the loader end cap. The plunger terminates in an end 74.
  • the head 70 of the plunger 66 is biased toward the loader end cap 60 by the plunger biasing means 76, which is a compression spring.
  • the spring 76 is contained within a loader body 78.
  • Figure 5 shows the condition of the valve assembly and of the tool immediately prior to use.
  • the valve spring 22 has been set in place over the valve stem 20, and the valve spring retainer 30 is positioned at the end of the valve spring 22.
  • the user has placed the valve locks 32 and 34 on the cylindrical surface of the protruding end portion 72 of the plunger 66. The means used to prevent the valve locks from falling off the protruding end of the plunger will be described in greater detail below.
  • the user has manipulated the tool to bring the central axis 54 into coincidence with the central axis 80 of the valve stem.
  • the user pushes the tool against the valve spring retainer 30, compressing the valve spring 22, permitting the tool to advance toward the valve stem sufficiently that the end 18 of the valve stem makes contact with and coincides with the end 74 of the plunger 66.
  • the end 18 of the valve stem pushes the plunger 66 into the loader end cap 60 against the urging of the spring 76, as shown in Fig. 7.
  • the end 64 of the loader end cap 60 pushes the valve locks 32 and 34 along the end portion 72 of the plunger and thereafter onto the valve stem 20.
  • the valve locks 32 and 34 engage the circumferential groove 44 of the valve stem.
  • valve spring retainer 30 engages the valve locks 32 and 34.
  • the tapered central bore 46 of the valve spring retainer 30 presses against the valve locks, pushing them radially inward into the circumferential groove 44 and preventing further movement of the valve spring retainer.
  • valve lock 32 and 34 there exists a need for some means for keeping the valve locks 32 and 34 in contact with the end portion 72 of the plunger in the positions shown in Figures 5 and 6, and in contact with the end portion 42 of the valve stem, as in Figure 7. If one or both of the valve locks were to fall off the protruding end portion 72 of the plunger while the tool is being brought into position, the valve lock might fall into the engine or onto the floor, and retrieving it could be time consuming.
  • Figure 12 is an enlarged fraction of Figure 6.
  • the central axis 80 of the valve stem is shown oriented vertically because in practice the valve stem is typically oriented approximately vertically. This permits the user of the tool to use his weight in pushing down on the tool to compress the valve spring.
  • the plunger 82 is composed of a nonmagnetic material such as non-magnetic stainless steel, aluminum, brass, or nylon.
  • the plunger 82 includes a hollow bore that extends almost to the protruding end of the plunger.
  • a powerful cylindrical-shaped permanent magnet 86 is secured to the end of the hollow bore 84 by an adhesive.
  • the north and south poles of the magnet are aligned with the central axis of the bore 84.
  • the loader end cap 60 is composed of a ferromagnetic material, as are the valve locks and the valve stem.
  • the permanent magnet 86 is composed of a rare earth alloy, which results in an extremely strong magnetic field. The magnetic field attracts the valve locks to the surface of the plunger thereby preventing the valve locks from falling away as the tool is being brought into position.
  • valve spring retainer 30 As indicated in Figures 6, 7 and 8, as the user pushes the tool against the valve spring retainer 30, the latter yields and is depressed with respect to the end 18 of the valve stem. Thus, the valve stem pushes the plunger upward, as seen in Figure 12, so that the permanent magnet 86 is carried into the ferromagnetic loader end cap 60. Because of its ferromagnetism, the loader end cap provides a preferred path for the magnetic lines of flux, which disengage from the valve locks thereby releasing them.
  • the plunger is composed of a ferromagnetic material and is permanently magnetized.
  • the magnetism retains the valve locks against the protruding end of the plunger.
  • the permanently magnetized plunger magnetizes the end portion 42 of the valve stem, and when the plunger is retracted into the loader end cap, the valve locks are retained in contact with the valve stem by the magnetism.
  • a viscous paste is applied to the protruding end of the plunger, and if necessary to the end portion 42 of the valve stem.
  • the viscous paste may be a grease or a petroleum jelly.
  • valve spring retainer 30 must be sufficiently far down along the valve stem to permit the valve locks to move to their final position.
  • the distance between the end 64 of the loader end cap 60 and the end 52 of the hollow body must exceed some critical dimension. This critical dimension varies from one engine to the next, because the valve spring retainers and valve stems have different shapes from one engine to the next.
  • the distance between the end 52 of the hollow body of the tool and the end 64 of the loader end cap is set for a particular engine by inserting a loader body 88 of appropriate length into the hollow body 50 of the tool.
  • the user must select the appropriate loader body 88 and insert it into the hollow body 50 of the tool along with a loader end cap 60 that has a central bore 62 equal in diameter to the diameter of the valve stem to be worked on.
  • the tool greatly expedites the installation of the valve locks, and is considerably less expensive than equipment previously used for installing the valve locks.
  • the tool of the present invention would be used by a mechanic to assist in the work of reconditioning or repairing an internal combustion engine having valves.
  • Use of the tool permits the valve locks to be installed in approximately one-quarter of the time that is required when the tool is not used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

Les clavettes (32, 34) de soupape présentent une saillie (40) et qui vient s'engager dans une rainure (44) périphérique qui s'étend autour de la partie (42) terminale de la tige (20) de soupape. La clavette de soupape est maintenue en place par une ouverture (46) centrale conique de la coupelle (30) du ressort de soupape, qui produit une force de serrage dirigée vers l'intérieur sur la clavette. L'outil comprend un piston (66) présentant un diamètre égal à celui de la tige de soupape. L'utilisateur place les clavettes de soupape sur la surface (72) cylindrique proéminente du piston, où elles sont maintenues en place par une force d'attraction magnétique. L'utilisateur pousse ensuite l'extrémité (52) de l'outil contre la coupelle du ressort de soupape, et comprime le ressort de manière que la tige de soupape pousse le piston dans un capuchon (60) ajusté fermant l'extrémité de chargement, jusqu'à ce que les clavettes soient transférées sur la tige de soupape et viennent s'engager dans la rainure périphérique.
PCT/US2001/005170 1999-09-11 2001-02-16 Outil permettant le montage de clavettes de soupape WO2002066202A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US09/394,483 US6219896B1 (en) 1999-09-11 1999-09-11 Tool for installing valve locks
US09/733,749 US6473965B2 (en) 1999-09-11 2000-12-09 Method for installing valve locks
PCT/US2001/005170 WO2002066202A1 (fr) 1999-09-11 2001-02-16 Outil permettant le montage de clavettes de soupape
EP01910891A EP1365885A1 (fr) 2001-02-16 2001-02-16 Outil permettant le montage de clavettes de soupape

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/394,483 US6219896B1 (en) 1999-09-11 1999-09-11 Tool for installing valve locks
US09/733,749 US6473965B2 (en) 1999-09-11 2000-12-09 Method for installing valve locks
PCT/US2001/005170 WO2002066202A1 (fr) 1999-09-11 2001-02-16 Outil permettant le montage de clavettes de soupape

Publications (1)

Publication Number Publication Date
WO2002066202A1 true WO2002066202A1 (fr) 2002-08-29

Family

ID=56290114

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/005170 WO2002066202A1 (fr) 1999-09-11 2001-02-16 Outil permettant le montage de clavettes de soupape

Country Status (1)

Country Link
WO (1) WO2002066202A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5752308A (en) * 1994-05-20 1998-05-19 Caterpillar Inc. Method of forming a hard magnetic valve actuator
US5761785A (en) * 1995-06-30 1998-06-09 Abb Flexible Automation, Inc. Vacuum tool for installing valve spring retainer and keys
US5842260A (en) * 1997-05-16 1998-12-01 Air Liquide America Corporation Valve removal tool, gas cylinder recycle kit, and process for removing valves from gas cylinders
US5915740A (en) * 1996-01-19 1999-06-29 Weitner; Werner Method and device for placing or removing valve-spring retainer locks
US5996201A (en) * 1998-01-30 1999-12-07 Ringle; Gerald D. Valve assembly tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5752308A (en) * 1994-05-20 1998-05-19 Caterpillar Inc. Method of forming a hard magnetic valve actuator
US5761785A (en) * 1995-06-30 1998-06-09 Abb Flexible Automation, Inc. Vacuum tool for installing valve spring retainer and keys
US5915740A (en) * 1996-01-19 1999-06-29 Weitner; Werner Method and device for placing or removing valve-spring retainer locks
US5842260A (en) * 1997-05-16 1998-12-01 Air Liquide America Corporation Valve removal tool, gas cylinder recycle kit, and process for removing valves from gas cylinders
US5996201A (en) * 1998-01-30 1999-12-07 Ringle; Gerald D. Valve assembly tool

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