Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
  • B27B17/00—Chain saws; Equipment therefor
  • B27B17/12—Lubricating devices specially designed for chain saws
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16N—LUBRICATING
  • F16N13/00—Lubricating-pumps
  • F16N13/02—Lubricating-pumps with reciprocating piston
  • F16N13/06—Actuation of lubricating-pumps
  • F16N13/10—Actuation of lubricating-pumps with mechanical drive
• • 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
  • Y10T74/00—Machine element or mechanism
  • Y10T74/18—Mechanical movements
  • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
  • Y10T74/18792—Reciprocating or oscillating to or from alternating rotary including worm
• • 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
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19642—Directly cooperating gears
  • Y10T74/19698—Spiral
  • Y10T74/19828—Worm
• • 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
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19949—Teeth
  • Y10T74/19953—Worm and helical

Definitions

• the present invention relates to a device for saw chain lubrication, especially in connection with a hand-held device, e.g. a chain saw, said device including a pump that in its turn includes a pumping house, a piston that is received in the pumping house and means to bring the piston to rotate and simultaneously perform a reciprocating motion in the longitudinal direction of the piston, said means including on one hand a worm pinion having means for driving cooperation with a prime mover and on the other hand and a gear pinion mounted on the piston.
• the invention also relates to a worm pinion, preferably included in a device for saw chain lubrication.
• said device can either be driven directly by the crank shaft or driven by the clutch drum mounted on the crankshaft .
• the pumping device for supplying lubricant has been mounted on the clutch drum. This means that the pumping device is activated only when the chain is driven, i.e. the pumping device is not activated during idling mode of the chain saw.
• a primary object of the present invention is to provide a device of the type mentioned above, said device having cooperating components that are cheap to manufacture and still provide a reliable availability performance.
• a further object of the invention is that the materials of the components included in the device are selected depending on the function that said component is to perform.
• a further object of the invention is that the structure and function of the device pays attention to the environment.
• At least the primary object of the present invention is realised by means of a pumping device that has been given the features defined in claim 1.
• Preferred embodiments of the invention are defined in the dependent claims.
• Figure 1 shows an exploded view in perspective of the components included in the device according to the invention and further cooperating/connecting components
• Figure 2 an end view of an embodiment of a blank for a worm pinion according to the present invention
• Figure 3 a side view of the blank according to figure 2
• Figure 4 a section along A-A in figure 2 ;
• Figure 5 an end view of a spirally wound spring wire that is included in the worm pinion according to the present invention
• Figure 6 a partly sectioned side view of the spring wire according to figure 5
• Figure 7 a side view of an embodiment of a worm pinion according to the present invention.
• a pumping device 1 according to the invention is schematically shown, said device 1 being adapted for supplying lubricant, usually oil, to the chain of a chain saw.
• the pumping device 1 includes a worm pinion 3 and a pump 5, that in its turn includes a pumping house 7 and a piston 9, that reciprocates in the pumping house 7.
• a gear pinion 10 is mounted on the piston 9, according to the invention said gear pinion 10 is manufactured from a plastic material according to prior art.
• the gear pinion 10 has a tangential groove 11, said groove having such a known configuration that the distance between the groove 11 and the pumping house 7 varies along the circumference of the groove 11.
• the groove 11 is adapted to cooperate with a stationary pin 12, i.e. a pin 12 that is mounted on a stationary part of the chain saw. How this configuration of the groove 11 affects the function of the pumping device will be described below.
• a crankshaft 13, a needle roller bearing 14, a clutch drum 15 and a clutch 16 is also shown.
• the pumping device 1 is intended to be mounted on the shaft extension 17 that the faces the pumping device 1 in figure 1.
• the bearing sleeve 18 of the worm pinion 3 is received directly on the shaft extension 17 without any intermediate, separate bearing means.
• the clutch drum 15 is likewise received on the shaft extension 17, said needle roller bearing 14 being attached between the bearing sleeve 19 of the clutch drum 15 and the shaft extension 17.
• the clutch drum 15 is provided with a spigot 20, said spigot 20 having splines and being intended to cooperate with a recess at the side of the worm pinion 3 that faces the clutch drum 15.
• supports surfaces 29 are arranged in astral configuration, said supports surfaces 29 extending radially outside the spigot 20 and being intended to constitute support for the end of the worm pinion 3 that faces the clutch drum 15.
• the clutch 16 is received via a threaded central hole 22, said clutch 16 in a known way being located within the clutch drum 15.
• a blank 23 for a worm pinion 3 is shown.
• Said blank 23 is preferably injection moulded of a plastic material, e.g. PA (polyamid) or POM (acetal) .
• the blank 23 includes a disc shaped portion 24 and a bearing sleeve 18 integrated with said portion 24.
• a splines shaped recess 25 is provided, said recess 25 being intended to cooperate with the spigot 20, said spigot 20 being equipped with splines and being received in the recess 25.
• a spirally shaped groove 26 is provided, said groove 26 extending from the free end of the sleeve 18 to the connection of the sleeve 18 to the disc shaped portion 24.
• Said groove 26 is shaped in connection with injection moulding of the blank 23, the consequence of this being that the groove 26 may be given an exact pitch.
• the inner side 27 of the bearing sleeve 18 is shaped as a cylindrical, in cross-section circular, sliding bearing surface that according to what has been said above abuts directly against the spigot 17 of the crankshaft 13. In connection therewith it might be suitable to mix lubricant into the plastic material that the blank 23 is manufactured from in order to facilitate the rotation of the worm pinion 3 on the shaft extension 17.
• spirally wound spring wire 28 of metallic material e.g. spring steel
• the spirally wound spring wire 28 is preferably manufactured according to conventional manufacturing technique of helical springs.
• the worm pinion 3 according to the present invention is shown, i.e. the spirally wound spring wire 28 has been mounted upon the sleeve 18 of the blank 23, said spirally wound spring wire 28 being screwed upon the sleeve 18.
• the spring wire 28 will be received in the groove 26 on the outer side of the bearing sleeve 18.
• the spring wire 28 is properly mounted on the bearing sleeve 18. Normally there is no need for any further anchoring of the spring wire in the groove 26.
• the spring wire 28 has such a feature that when it is threaded upon the sleeve it tends to "open” , i.e. its diameter will increase but if it is desired to unthread the spring wire it will "pinch” around the sleeve 18. This is a further reason that there is no need for any special anchoring of the spirally wound spring wire 28 on the bearing sleeve 18.
• the spring wire 28 When mounting the spring wire 28 upon the sleeve 18 the spring wire 28 will adapt to the groove 26 of the sleeve 18, i.e. the spring wire 28 receives the pitch of the groove 26.
• the bearing sleeve 18 functions together with the external spring wire 28 as a helicoidal pinion.
• the clutch drum 15 will drive the worm pinion 3, via the cooperation of the spigot 20, said spigot 20 being equipped with splines, with the recess 25, and the spirally shaped spring wire 28, see figure 7, will cooperate with the gear pinion 10 and cause it to rotate. Due to the design of the groove 11 and its cooperation with the spigot 12 the piston 9 will be given a reciprocating motion in its longitudinal direction, said motion on one hand sucks lubricant into the pumping house 7 and on the other hand pumps lubricant out of the pumping house 7 in order to supply it to the chain, said arrangement not being shown in figure 1.
• the worm pinion according to the present invention includes a spirally shaped, prefabricated element that is received upon a support body that in the description above constitutes the blank 23.
• the spirally shaped element constitutes a spirally wound spring wire of for instance spring steel.
• the spirally shaped element alternatively may be made out of brass, bronze or plastic material, in the last mentioned case the spirally shaped element may be manufactured by extrusion. It is preferred if the spirally shaped element is manufactured from a heat conductive material.
• the cross section of the wire does not need to be circular and in exemplifying and non-restricting purpose triangular or square cross section may be mentioned.
• the support body is provided with a groove in order to receive the spirally shaped element there should be an adaptation of the cross section of the groove to the cross section of the wire .
• the support body/blank may be manufactured in several ways and from a number of materials, in exemplifying and non- 7 restricting purpose it may be mentioned that the support body/the blank may be manufactured out of sintered metal powder, by casting in for instance alloys of zinc, bronze, aluminium, by metal cutting, e.g. turning, e.g. in steel, bronze or brass, in polymer materials, by e.g. injection moulding.
• injection moulding it is feasible within the scope of the invention to have the prefabricated spirally shaped element placed in the injection moulding tool for the support body/the blank and that in connection with the injection moulding the spirally shaped element is connected with the support body/the blank.
• the reciprocating motion of the piston 9 is effected by having a groove 11 to cooperate with a pin 12.
• Other structural solutions to effect said reciprocating motion are possible within the scope of the present invention, and in exemplifying and non-restricting purpose it may be mentioned that the free end of the piston may be bevelled, said bevelled end is brought to cooperate with a stationary abutment, said bevelling generating a reciprocating motion of the piston when it rotates.
• the spigot 20, said spigot 20 being equipped with splines, and the cooperating splines shaped recess 25 may of course be designed in several ways within the scope of the invention, however driving must be present when they are in engagement with each other.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Transmission Devices (AREA)
• Sawing (AREA)
• Gears, Cams (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20410709

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (3)

Citations (5)

Family Cites Families (18)

• 1998
  • 1998-03-26 SE SE9801022A patent/SE516027C2/sv not_active IP Right Cessation
• 1999
  • 1999-03-23 DE DE19983070T patent/DE19983070T1/de not_active Withdrawn
  • 1999-03-23 US US09/646,976 patent/US6523645B1/en not_active Expired - Lifetime
  • 1999-03-23 AU AU33502/99A patent/AU3350299A/en not_active Abandoned
  • 1999-03-23 WO PCT/SE1999/000449 patent/WO1999048654A1/en not_active Ceased
  • 1999-03-23 JP JP2000537683A patent/JP2002507496A/ja active Pending

Patent Citations (5)

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