WO1992009412A1 - Galet tendeur de chaine - Google Patents

Galet tendeur de chaine Download PDF

Info

Publication number
WO1992009412A1
WO1992009412A1 PCT/FI1991/000353 FI9100353W WO9209412A1 WO 1992009412 A1 WO1992009412 A1 WO 1992009412A1 FI 9100353 W FI9100353 W FI 9100353W WO 9209412 A1 WO9209412 A1 WO 9209412A1
Authority
WO
WIPO (PCT)
Prior art keywords
cage
bearing
hub
chain
grooves
Prior art date
Application number
PCT/FI1991/000353
Other languages
English (en)
Inventor
Antti Tuuri
Paavo Kemppainen
Original Assignee
Oy Nicomec Finland Ltd.
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
Application filed by Oy Nicomec Finland Ltd. filed Critical Oy Nicomec Finland Ltd.
Publication of WO1992009412A1 publication Critical patent/WO1992009412A1/fr

Links

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
    • 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
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/05—Features relating to lubrication or cooling or heating of chains

Definitions

  • This invention relates to chain idler of guide bar on chain sawing device, and particularly a chain idler which has a construction as simple as possible, and on which the lubri ⁇ cation is ensured in all circumstances.
  • Guide bars around which an endless cutting saw chain is rotating with a speed of 45 - 70 m/s, are used on chain saws, such as power saws and cutting device of multi-function machines.
  • the chain idler is installed on the nose of the guide bar, with the purpose to help the saw chain to turn 180° around the nose of the guide bar and to bear all the great loadings which rests on the nose of the guide bar.
  • the chain idlers on guide bars are traditionally and almost in all available solutions insufficiently lubricated and very difficult to be installed or changed. Lubrication is naturally extremely important, while the speed of rotation of the idler may be 2000 - 6000 rpm. and the loads on it are huge, especially when the nose of the guide bar get squeezed in a way or another.
  • the purpose of this invention is to solve the disadvantages on the technical level and to produce a chain idler which gets a sufficient and an abundant lubrication in all cir ⁇ cumstances, and which is changeable in an easy and simple way.
  • Figure 1 presents the side view of the construction of chain idler in accordance to the invention.
  • FIG. 2 presents another embodiment in accordance to the solution of the invention.
  • Figure 1 presents in accordance to the invention, as mentioned, the side view of the chain idler 1 which consists of an immoveable hub 2, surrounded by a rotating cage 3.
  • the hub 2 is fixed to the steel guide bar in any desired way, but especially so that is it possible to remove the hub and again to fix it rapaidly.
  • the fixing may be done by using a bushing-like part provided with an female thread and a corresponding peglike part provided with a compatible male thread.
  • Figure 1 shows the head 4 of the peglike part of this fixing system. In the middle of this head is a suitable hollow or hole 5, for example for an alien key. With the help of this key, the fixing parts can be screwed into each other and fix the hub into the score of the bar nose at the same time.
  • the chain idler construc ⁇ tion does not include any needle bearing. Consequently, when handling a chain idler one has to deal only with two parts, namely the hub 2 and the cage 3 (Fig. 2) .
  • a change of the bearing to a slide bearing or, as it is presented in figure 1, to a ball bearing 8 is possible due to the surprising and exceptional design of the chain idler in accordance to the invention.
  • a cutting chain which rotates around the guide bar in an endless loop, as well as around the idler, leaning against the groove, is lubricated by feeding a desired amount of oil through a channel at the root of the guide bar to the groove of the bar, where from it is transported to the idler.
  • a part of this oil will be catched with the help of grooves or hollows 6, which have been made on the rotating idler, and will be transported further towards the hub.
  • On the slide bearing (Fig. 2) between the hub and the outer cage, is an overpressure oil bed formed, which lubricates the bearing in an effective way.
  • FIG 2 there is a diagrammatic presentation that the grooves or hollows 6 on the surface of the idler have been positioned on the both sides of the outer cage, and the direction of the grooves is essentially the same on both sides.
  • This is the solution when the guid bar is not turned around every now and then. This means that the idler rotates allways to the same direction. In this case, grooves on both sides, becomes the oil pressure towards the hub more effective.
  • a guide bar, which is not turned, is used especially when urea is sprayed during the cutting on the sawn surface of the tree, especially on the surface of the stump.
  • Urea is though a very corrosive substance which causes more problems on the durability of guide bar/chain idler consturction. Even these problems are solved in accordance to a solution of the invention.
  • the oil is catched at the root of a cog on the outer cage, and the oil is pressed towards the hub forming an oil bed on which the bearing moves well lubri- cated.
  • a part of the oil from the bearing gets out through the channels on the opposite side, causing oil circulation by this, which again ensures the lubrication.
  • the exit of oil is naturally less forced than the hurl towards the bearing, while the starting point locates on a con ⁇ siderable smaller circle.
  • a so called urea bar If using a guide bar which is not turnable, a so called urea bar, the lubrication is surprisingly good despite the fact that even urea/water is transported with the chain.
  • the solution according the invention does actually catch oil more effective than water/urea, so that expressly the oil gets towards the bearing and urea/water stays on the outer cage.
  • the hub is provided with oil pockets 7, as is shown in figure 2. Their purpose is to maintain oil supply in the hub. These pockets 7 supply oil for lubrication, for example when the temperature of the bar nose rises due to pressure or bending. In this way the lubrication is ensured even in severe circumstances.
  • the number of oil pockets 7 is not critical, a few pockets 7 is enough.
  • Figure 1 presents an embodiment for assembling the hub 2 and the outer cage 3 together, in which the needle bearing of the prior art has been replaced with ball bearing, which in the presented form has several advantages compared to the needle bearing.
  • Figure 1 presents a solution, according which there is a concave groove, known as such, on the outer surface of the hub, and a corresponding concave groove on the inner surface of the cage, so that if a suitable ball is put between the hub and cage, the above mentioned concave surfaces forms bearing surfaces for the balls 8.
  • the bearing balls 8 then again are put on their place according the invention so that on the hub 2 and cage 3 is bored a side boring which in figure 1 is illustrated with reference number 9.
  • the diameter of the boring is essentially the same as the diameter of the bearing balls, but especially a bit larger.
  • the boring is made when the hub 2 and the cage 3 are in their presumable final positions with the bearing on its place.
  • the boring is made from the side, exactlly in the middle of the gap between the hub and cage, so that the boring covers as much on both parts in the direction of the radius, and to the middle of the bearing surface in the depth.
  • the assembling of the bearing goes in this case as follows.
  • the borings 9 on the hub 2 and the cage 3 are placed so that they match.
  • the bearing balls 8 are pressed through the boring 9, one by one, between the concave surfaces where from they easily roll . to fill the room between the bearing surfaces, for example when the bearing is held the boring upwards.
  • the hub and cage are rotated to opposite directions, and the balls can not drop out from their places any more, while the halves of the boring 9 and the bearing balls do not easily match, if not matched by purpose.
  • half of the balls can be collected on the inner side of the cage before the hub is assembled on its place, and the rest of the bearing balls can be put on their place in the above mentioned way.
  • the ball bearing which consists of several bearing balls 8, keeps the hub 2 and the cage 3 together. In this case, handling and changing of such a compact assembly is very simple, and it is not necessary to worry about bearing needles any more.
  • the hub 2 is a bit thicker than the cage 3 because by this the cage is given free space to rotate in the score of the guide bar nose.
  • the dimensioning of the bearing can be done so that the diameter of a bearing ball is close to the dimension of the cage, but the dimension of the bearing is rather chosen to get a maximum bearing surface for the bearing.
  • a considerably larger bearing surface is reached with a ball bearing arrangement in accordance to the invention, compared to the needle bearing according the prior art. It can be said that the improvment on the bearing surface is roughly at least 30 %. -And instead of the linelike contacting surface of the needle bearing it is now achieved a better form on the contacting surface.
  • the total solution in accordance to the invention does not cause any risk of the lubrication not to be ensured in all circumstances.
  • the solution according the invention can be modified in many different ways. Therefore the inclination of the grooves or hollows 6 is, with respect to the direction of the radius, chosen on the base of tests in working conditions. It is thought that the inclination is at its best at 5 - 15° . It is also obvious that the grooves or hollows can be formed so that maximum benefits are achieved.
  • the grooves can be equal in width or they can be, for example, wider or deeper at the outer end. The depth is chosen so that it does not cause any faults in the durability but it is adequate for the purpose. Also the number of grooves or hollows can be chosen as needed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

La présente invention se rapporte à un galet tendeur de chaîne d'une glissière de guidage sur une tronçonneuse, comprenant un moyeu (2) et une cage (3). Des rainures ou des creux (6) se trouvant sur la cage rotative (3) saisissent de l'huile lubrifiante et la transportent, entraînée par le mouvement de rotation, vers le moyeu (2) afin de lubrifier efficacement un palier et les côtés de la cage (3).
PCT/FI1991/000353 1990-11-26 1991-11-26 Galet tendeur de chaine WO1992009412A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI905809 1990-11-26
FI905809A FI87899C (fi) 1990-11-26 1990-11-26 Noshjul

Publications (1)

Publication Number Publication Date
WO1992009412A1 true WO1992009412A1 (fr) 1992-06-11

Family

ID=8531459

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000353 WO1992009412A1 (fr) 1990-11-26 1991-11-26 Galet tendeur de chaine

Country Status (3)

Country Link
AU (1) AU8939791A (fr)
FI (1) FI87899C (fr)
WO (1) WO1992009412A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924945A (en) * 1996-12-03 1999-07-20 Sandvik Ab Sprocket with indentations forming hydrodynamic bearings
FI129872B (fi) * 2020-05-18 2022-10-14 Pernioen Metsaekuljetus Oy Ketjusahan kärkipyörä ja sen voitelu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1301295A (en) * 1916-08-24 1919-04-22 Max Mossig Grooved and recessed ball-bearing.
US2992660A (en) * 1955-08-22 1961-07-18 Mcculloch Corp Saw chain and bar unit
FR1339486A (fr) * 1962-11-27 1963-10-04 Torrington Co Guide d'extrémité pour scie à chaîne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1301295A (en) * 1916-08-24 1919-04-22 Max Mossig Grooved and recessed ball-bearing.
US2992660A (en) * 1955-08-22 1961-07-18 Mcculloch Corp Saw chain and bar unit
FR1339486A (fr) * 1962-11-27 1963-10-04 Torrington Co Guide d'extrémité pour scie à chaîne

Also Published As

Publication number Publication date
FI905809A0 (fi) 1990-11-26
FI905809A (fi) 1992-05-27
FI87899B (fi) 1992-11-30
AU8939791A (en) 1992-06-25
FI87899C (fi) 1993-03-10

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