JPH0473362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a guide rail for a saw chain of a power saw, the guide rail having two side rails,
One chain sprocket is arranged between these side rails, and this chain sprocket can rotate using the circumferential surface of its inner hole on multiple rollers arranged on the race circumferential surface of the roller bearing. The roller bearing is supported on both sides of the roller bearing.
It relates to a type in which two plate members are arranged.

PRIOR ART In the guide rail of the above type known from U.S. Pat. Both plate members are fitted and placed on one side. Both plate members having a thickness approximately one-fifth of the thickness of the chain sprocket protrude from the rollers of the roller bearing, and abut against the sides of the chain sprocket with their peripheral surface portions protruding from the rollers, This surrounds the roller.

Problems to be Solved by the Invention In the above-mentioned known guide rail, a considerable frictional load acts on each plate member and chain sprocket based on the lateral force generated during operation with the power saw, and this causes the function of the guide rail to deteriorate. There is a risk that this will result in a higher lifetime. To prevent this problem,
Frequent post-lubrication of the bearing area is necessary;
This guide rail is therefore generally provided with at least one additional central lubrication system, with which it is replenished with lubricant.

The present invention solves this problem by saving or avoiding expensive guide surface machining of chain sprockets, achieving reduced friction and no need for lubrication maintenance, and providing accurate and non-tilting rollers. It is an attempt to gain position.

Means for Solving the Problems The means according to the present invention for solving the above-mentioned problems is such that the plate member is formed as a thin, substantially membrane-like guide flat plate, and this guide flat plate is attached to the side rail. , is in contact with a flat surface formed without steps up to its free front end, and furthermore, a minimum annular gap is formed between the peripheral edge of the guide flat plate and the outer edge of the inner hole of the chain sprocket. The flat guide plate is formed and arranged so as to

DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated guide rail 1 has two parallel side rails 2, 2a, each of which has a semicircular rounding in its front end region. These side rails 2, 2a have a uniform wall thickness and therefore have flat surfaces 4 without steps on their mutually opposite inner sides.
is formed, each flat surface 4 extending uninterrupted in one plane to the front end 5 of the side rail 2, 2a without any expensive protrusions or caps.

There is a race 6 between both side rails 2 and 2a.
is arranged, and this lace 6 is connected to the 2 laces arranged on both sides.
A distance is secured between the two side rails 2, 2a together with the two guide flat plates 8, 8a. The guide flat plates 8, 8a are located between the side surfaces 9 of the race 6 and the flat surfaces 4 of the side rails 2, 2a. The race 6 and both guide flat plates 8, 8a have through holes 1 of the same shape.
0, and this through hole 10 has side rails 2, 2
It coincides with the through hole formed in a, and the rivet pin 7 is inserted therein. The rivet head of the rivet pin 7 is fitted into the housing of the side rails 2, 2a, and the race 6, both guide flat plates 8, 8a and both side rails 2, 2a form one structural unit via the rivet pin. ing. In the illustrated example, a total of six rivet pins 7 are arranged on a circle at a distance from each other.

A chain sprocket 11 is further arranged between the side rails 2, 2a, and each tooth 12 of this chain sprocket 11 engages with each link of the saw chain circulating along the guide rail 1. There is. The chain sprocket 11 is rotatably supported on a stationary race 6 via a plurality of rollers 13. These rollers 13 are connected to the outer peripheral surface 14 of the race 6 and the chain sprocket 11.
A roller bearing 17 is formed which is located between the circumferential surface 15 of the inner bore 16 formed therein and in which the bearing play is reduced to a minimum.

Each flat surface 4 of the side rails 2, 2a and the race 6
Each guide flat plate 8, 8a disposed between each side 9 of the chain sprocket 1 has a diameter that is
The diameter of the inner hole 16 of No. 1 is slightly smaller than that of the inner hole 16 of No. 1. Advantageously, the diameter of the guide plate 8, 8a is approximately 0.07 mm smaller than the diameter of the bore 16.
It is set to be smaller by mm. In this way, the guide flat plates 8, 8a actually cover the end faces 18 of the rollers 13 of the roller bearing 17. Furthermore, according to the structure and arrangement of the guide flat plates 8, 8a according to the present invention,
A minimum annular gap 21 is formed between the peripheral edge 19 of each guide plate 8, 8a and the outer edge 20 of the bore 16 of the chain sprocket 11. This smallest annular gap 21 is advantageously designed to be small enough to prevent the permanent lubricant located in the roller bearing 17 from flowing out, so that the actual use of the roller bearing 17 is A seal is achieved, which ensures that dirt cannot penetrate through the smallest annular gap 21 into the roller bearing 17. The sealed structure of the roller bearing 17 also provides good corrosion protection, since the permanent lubricant in the roller bearing 17 prevents the ingress of moisture through the smallest annular gap 21. At the same time, the smallest annular gap 21 according to the invention
According to the above, even if relative movement occurs between the chain sprocket 11 and the guide flat plates 8, 8a due to large lateral stress during work with the power saw, the chain sprocket 11 and the guide flat plates 8, 8a , 8a are not in contact with each other. This reduces wear and also ensures long-term high performance even under high loads without the need for additional post-lubrication in the bearing area. A further advantage is that there is no need for expensive surface treatments on each side 23 of the chain sprocket 11 for lateral sliding guidance, since there is no need to apply an expensive surface treatment to the side surfaces 23 of the chain sprocket 11 between the guide plate 8, 8a and the chain sprocket 11. , since no sliding contact occurs due to the presence of the smallest annular gap 21.
Therefore, the chain sprocket 11 does not require additional side machining and can be manufactured at low cost.

The flat guide plates 8, 8a advantageously consist of thin plates that are approximately membrane-thin but nevertheless have sufficient rigidity and strength. In particular, as is clear from FIG. 4, the thickness of the guide flat plates 8, 8a is equal to
It is formed thinner than 1/10 of the thickness of 1. In the illustrated example, the thickness of each guide flat plate 8, 8a is approximately 1/15 of the thickness of the chain sprocket 11.
This guide flat plate 8, 8a is preferably from 0.08 mm.
0.12 mm, but most preferably 0.1 mm.

Furthermore, as can be seen from FIG. 4, the thickness of the chain sprocket 11 is approximately the same as the thickness of the rollers 13. On the other hand, the race 6 is formed to be slightly thicker than the thickness or axial dimension of the roller 13, so that there is a gap between each end surface 18 of the roller 13 and the guide flat plates 8, 8a. A narrow permanent lubricating gap 22 is formed on each side of the roller bearing 17, and a lubricant is stored in the gap 22 to reduce friction within the roller bearing 17. The axial length of the rollers 13 is approximately 0.06 mm smaller than the thickness between the two side surfaces 9 of the race 6. Therefore, the width of the permanent lubrication gap 22 is as thin as about 0.03 mm.

In the illustrated example, the diameter of the guide flat plates 8, 8a is approximately 0.07 mm smaller than the diameter of the inner hole 16 of the chain sprocket 11, so that the width of the smallest annular gap 21 is only approximately 0.035 mm. It is approximately the same width as the permanent lubrication gap 22. As a result, the width of the minimum annular gap 21 is also significantly smaller than the thickness of the flat guide plates 8, 8a, approximately 1/3 of that.
is the value of

A guide gap 24 is formed between both side surfaces 23 of the chain sprocket 11 and each flat surface 4 of the side rails 2, 2a, and extends consistently to the front end 5 of the side rails 2, 2a with the same width.
The width of this guide gap 24 is determined by the width of the guide flat plate 8.
Alternatively, it is the thickness of 8a plus the width of permanent lubrication gap 22. In any case, guide gap 24
The width of the guide plate 8 or 8a is at least the same as the thickness of the guide flat plate 8 or 8a.

In the guide rail 1, the guide flat plates 8, 8a
Due to the structure and arrangement according to the invention of
If the thickness or axial dimension of the roller 13 is 1.50 mm, then the nominal axial play is 0.06 mm, with a maximum of 0.15 mm and a minimum of 0.01. The tilting angle in the area of the chain sprocket is also very small.

Due to the good permanent lubrication in the bearing area, no wear occurs between the respective guide flat plates 8, 8a and 13 even after long continuous loads. Due to the reduced axial play in the present invention,
Good guidance of the rollers 13, low wear and thus low heating is ensured. Furthermore, the ingress of dirt is prevented, thereby providing a long service life. Furthermore, high corrosion resistance is ensured by sealing the lubricant. Guide rail 1 according to the invention
In practice, it is permanently lubricated only once at the factory over its service life, thereby eliminating the need for post-lubrication and saving additional grease loading operations. Furthermore, bearing lubrication is also performed by the oil attached to the chain, which eliminates the need for conventional lubrication every 2 to 3 days, creating an overall maintenance-free guide rail structure that does not require any post-lubrication. There is.

The flat guide plates 8, 8a are particularly wear-resistant and are preferably cold-rolled and hardened.
It is advantageous if it is made of block gauge steel strip having a tensile strength of more than 2000 N/mm ² . Therefore, the above-mentioned block gauge steel strip forming the guide flat plates 8, 8a is an extremely strong film-like member, such as spring strip steel, and its tensile strength is 2000 N/mm ² or more. After the heat treatment process, it is further hardened by cold rolling.

Effects of the Invention According to the present invention, the conventionally uneconomical machining work of the guide surface of a chain sprocket is avoided, friction is reduced, maintenance work for lubricant is not required, and rollers are Accurate positioning is possible without tilting.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
Figure 2 shows a side view of the free end area of the guide rail according to the invention for a saw chain guided on a rotatably mounted chain sprocket;
3 is a side view of the guide flat plate according to the invention arranged on the side of the roller bearing of the deflection head of FIGS. 1 and 2; FIG. FIG. 4 is an enlarged view of the inside of the circle in FIG. 2. 1... Guide rail, 2, 2a... Side rail, 3... Rounded part, 4... Flat part, 5... Front end, 6... Lace, 7... Rivet pin, 8, 8
a... Guide flat plate, 9... Side surface, 10... Through hole, 11... Chain sprocket, 12... Teeth, 13... Roller, 14... Outer peripheral surface, 15... Circumferential surface, 16... ...Inner hole, 17...Roller bearing, 18...
End face, 19...periphery, 20...outer edge, 21...
...Minimum annular gap, 22... Permanently lubricated gap, 23... Side surface, 24... Guide gap.

Claims (1)

[Scope of Claims] 1. A guide rail for a saw chain of a power saw, which has two side rails, and one chain sprocket is disposed between the two side rails. is rotatably supported by the circumferential surface of its inner hole on a plurality of rollers arranged on the circumferential surface of the race of the roller bearing, and furthermore, two plate members are arranged to cover the roller bearing on both sides. In this type, the plate member is a substantially membrane-like thin guide flat plate 8, 8a.
The guide flat plate is in contact with the flat surface 4 of the side rails 2, 2a, which is formed without steps up to the free front end 5, and the guide flat plate 8, 8a is in contact with the flat surface 4 of the side rails 2, 2a. A power source characterized in that the guide flat plates 8, 8a are formed and arranged so that a minimum annular gap 21 is formed between the peripheral edge 19 and the outer edge 20 of the inner hole 16 of the chain sprocket 11. Guide rail for the saw chain. 2. The guide according to claim 1, wherein the diameter of the guide flat plates 8, 8a is slightly smaller than the diameter of the inner hole 16 of the chain sprocket 11 by twice the dimension of the smallest annular gap 21. rail. 3. The thickness of the guide flat plates 8, 8a between the side surface 9 of the rail 6 and the flat surface 4 of the side rails 2, 2a is one tenth of the thickness of the chain sprocket 11.
The guide rail according to claim 1 or 2, which has a smaller value than . 4. Between the two end faces 18 of the rollers 13 and each flat guide plate 8, 8a, a permanent lubricating gap 22 for receiving lubricant is formed in each case. Any one of up to
Guide rail as described in section. 5. The width of the minimum annular gap 21 between the peripheral edge 19 of the guide flat plates 8, 8a and the outer edge 20 of the inner hole 16 of the chain sprocket 11 is the same as that between the end face 18 of the roller 13 and the guide flat plate 8, 8a. 5. A guide rail according to claim 1, wherein the guide rail has a width approximately equal to the width of the permanently lubricated gap 22 between the guide rails. 6. The width of the minimum annular gap 21 between the peripheral edge 19 of the guide flat plates 8, 8a and the outer edge 20 of the inner hole 16 of the chain sprocket 11 is smaller than the thickness of the guide flat plates 8, 8a. The guide rail according to any one of paragraphs 1 to 5. 7. 1 each between the side surface 23 of the chain sprocket 11 and the flat surface 4 of the side rails 2, 2a.
continuous guide gap 24 up to the front end 5
The guide rail according to any one of claims 1 to 6, wherein a width of the guide gap 24 is at least the same as the thickness of the guide flat plates 8, 8a. 8. The width of the guide gap 24 between the side surface 23 of the chain sprocket 11 and the flat surface 4 of the side rails 2, 2a is the same as the thickness of the guide flat plates 8, 8a plus the width of the permanent lubrication gap 22. The guide rail according to claim 7. 9. Any of claims 1 to 8, in which the guide flat plates 8, 8a are made of particularly highly wear-resistant block cage strip steel having a tensile strength of 2000 N/mm ² or more. or the guide rail described in paragraph 1.