SU1416776A1 - Chain transmission - Google Patents

Abstract

The invention relates to the field of mechanical engineering, in particular to gears with lamellar folding chains. The invention makes it possible to increase reliability by allowing rolling without sliding of the mating surfaces and reducing the contact stresses in the chain hinge. To achieve the goal, the roller is made with two coats on the edges and one wide, located diametrically opposite to two edges. The flats have arcuate portions in contact with the arcuate portions of the plate openings. Rolling is provided by the difference of the radii of the arcuate portions of the holes and the face of the rollers. 2 h. the item of f-ly, 13 ill.

Description

f

05

The invention relates to mechanical engineering, in particular, to lamellar gears with folding traction chains in various industrial and agricultural conveyors.

The aim of the invention is to increase reliability, provide the possibility of rolling without sliding of mating surfaces, in particular a roller along the middle arcuate portion of the working part of a figured plate hole, as well as reducing the contact stresses in a chain hinge.

FIG. 1 shows a plate folding folding chain, top view; in fig. 2 - transmission asterisk; in fig. 3 shows section A-A in FIG. 2; in fig. 4 - chain roller, front view; in fig. 5 is a section BB in FIG. 2; in fig. 6 - chain roller, top view; in fig. 7 is a sectional view BB in FIG. 6; in fig. 8 - chain plate, side view; in fig. 9 - plate folding chain, side view; in fig. 10 and 11 - the stages of assembly and disassembly of the chain; in fig. 12 - interaction of chain elements during its linear motion; in fig. 13 - the same, when turning, chain links.

Plate folding chain comprises inner 1 and outer 2 links consisting of plates 3 interconnected by cylindrical step rollers 4. Each of the cylindrical stepped rollers 4 has at the ends of a flat 5 located on one side. The width S of the flats 5 (Fig. 4) is selected on the basis of the free placement on it of the plate 3 of the outer link 2. The minimum distance b in the cross section of the flats (Fig. 5) is determined based on the strength of the roller. In the cross section of the roller 4, passing through the loop 5, there is an arcuate section 6 matching with a flat along the edges AI and B | respectively.

The lip 5 is formed by two conjugated sections 7 and 8. The arcuate section 7 is diluted with a concavity inside the roller 4 and is conjugated at the point Ci with the straight line end of the lip 5. The length 1 of the straight end 8 is selected taking into account the allowable contact stresses for the roller material 4, plates 3 and asterisks 9. The radius R of the concave part 7 (Fig. 5) of the flat face 5 is determined by the formula

d. 0,25d2- (b / 2) 2- | arccos l- - | - ------ -j

,

i 0 25d2- (b / 2) 5Г i 2R, (R, -bb72) J Z

arccos

the radius of the middle arcuate section of the working hole of the plate (Fig. 8); number of sprocket teeth; diameter of the groove of the roller (Fig. 5);

five

b is the distance from the rectilinear portion of the flat to the axis of symmetry of the roller (Fig. 7).

A bald spot 10 is located in the middle part of the roller on the diametrically opposite side, similar to the end one. With the average flat 10 matched plate 3 of the internal link 1 chain. The width s of the flatbed 10 is determined by the condition of free placement of a number of two inner plates 3 located 1. The dimensions and the cross-sectional shape of the flatfish 10 (Fig. 7) coincides with the size and shape of the bald spots 5 located at the ends of the roller 4. To prevent self-disassembly the chain is formed by an axial 5 thrust bead 11 of height h. The height of the collar 11 is determined by the difference in diameter D) A

ditch (-T) stepped cylindrical

roller. The shoulders are formed from two sides 0 both for the plates 3 of the outer link 2 and for the plates 3 of the inner link 1.

In each of the plates 3 (Fig. 8) there are two figured holes 12, each having a circular mounting part 13 located closer to the center of the plate 3, and a profiled working part 15 connected to the end of the plate 3. The circular mounting part 13 and the longitudinal slot 14 are designed for assembling and disassembling chains and the shaped working part 15 is used to place the end or middle part of the roller 4 (Fig. 1 and 9) with flat-faced flat faces 5 and 10 (Fig 4, 6 and 9) in working position. The circular assembly part 13 (Fig. 8) has a diameter di greater than the diameter D of the roller 4. The width b of the slot 14 exceeds the greatest distance L in the cross section of the roller 4 (Figures 5 and 7). The working part 15 of the hole 12 is asymmetric and is formed by three conjugate arcuate parts 16-18. 0 Sections 16 and 18 are located on the sides of the longitudinal slot C and facing concavity inside the working part 15 of the aperture lii, and section 17 is located opposite the longitudinal slot 14 and bulged with the inside of the working part 15 of the aperture bulge 12. The side arcuate section 18 is conjugated at one end with the longitudinal slot 14 at point A, and the other end of the res. at point B with a rectilinear end 19 of the middle arcuate section 17 located perpendicular to the longitudinal axis OO of the symmetry of the plate 3. The length of the rectilinear end 19 coincides with the corresponding length of 1 pin 5 of the roller 4. The rectilinear and arc-shaped part of the section 17 wives at point C. The side arcuate section 16 is 5 strands with a longitudinal slit 14 at point D. The other end of the side arcuate section 16 is adjacent to the middle arcuate section at point F. Radii Ri

side arcuate sections are the same

I

and equal to the radius () of the roller 4. The center of curvature of the side arcuate section 18 is located at the intersection point of the longitudinal 5 axis of symmetry OO of the mounting part 13 of the hole 12 and the longitudinal slot 14 with a line perpendicular to the axis of symmetry OO and spaced from the straight line the end 19 of the middle arcuate section 17 for a distance equal to b. The center of curvature of the side arcuate portion 16 is located on a line, perpendicular to the axis of symmetry of the OO plate and passing through the center of curvature of the arc portion 18.

The chain is assembled as follows.

The rollers 4 (FIG. 10), having flats 10, are inserted into the mounting holes 13 of the plates 3 of the inner link 1 and pushed them through the longitudinal slots 14 before entering the working parts 15 (FIG. 11) of the holes 12 of the plates 3. The rollers 4 unfold on 90 ° before the contact of the face 10 of the rollers 4 with the middle arcuate sections 17 (Fig. 8) of the working parts 15 of the holes 12.

The plates 3 of the outer link 2 are placed at an angle of 90 ° to the plates 3 of the inner link 1 and in this position are put on the ends of the rollers 4 having flats 5, then the plates 3 of the outer link 2 advance the radius of curvature R2 of the middle arc working parts 15

the total area is determined by the formula -L / 2 +

yCb / z;

., 0 2.L25di- (b / 2) .i 1-cos r / Z

holes 12 and rotate them 90 ° so that the straight end 19 of the middle arcuate portion 17 is in contact with the straight end 8 of the flashing face 5 of the roller 4. Re, r

where b is the distance from the linear portion of the flat-faced flat to the axis of symmetry of the roller (Figs. 6 and 9); d is the diameter of the groove of the roller; Z is the number of sprocket teeth. The center of curvature of the middle arcuate portion 17 is located on the line Oi-Oi passing through the conjugation point C of the rectilinear and arcuate portions of the middle

2Q, the next roller 4 is inserted simultaneously into the mounting holes 13 of the plates 3 of the outer link 2 and the next inner link 1. Next, the first assembly steps are repeated, as a result of which the roller 4 with the bald spots 5 is placed in the working position inside the working parts 15 of the holes 13 plates 3 of the outer link 2. Then the plates 3 of the inner link 1 are shifted by the middle bald spot 10 of the roller 4, rotated by an angle of 90 ° relative to the plates 3 of the outer link 2,

section 17 and parallel longitudinal osiprodvigayut them in this position before entering

35

About the symmetry of the plate 3. At the same time, the radius R of the concave part 7 (Fig. 5) of the flats 5 of the roller 4 exceeds the radius R2 of the middle arcuate portion of the working opening of the plate. The ends of the plates 3 are rounded with a radius of Ra. The center of the radius Rs is located on the axis of symmetry of the OO plate 3.

The sequence of construction of the hole.

Lay the length of the segment BC, equal to the size L of the roller 4; through point C, a line Oi-Oi is drawn; radius R2 outlines the arc 40 with F, the length of the arc

CF R2Ti MaKC.,

about 25

where the angle r |) max agssose 1-2 -T j-; on

at distance b, a line is drawn perpendicular to the line Oi-Oi (size b is shown in Fig. 7); conducting a longitudinal axis of symmetry of the O-O plate 3 at a distance of 1 from the line Oi-Oi; with a radius of Ri, an arcuate area is outlined with an radius of Ri; an arcuate section 16 is outlined; diameter 50 di (center on the line О-О) draw the mounting hole 13; symmetrically, lines O-O lay the width B of the longitudinal slit 14 aligned with the mounting screwdriver 4 into the working parts 15 of the holes 12 and turned 90 ° so that the straight ends 19 and 8 of the middle arcuate portion 17 of the plates 3 and the flats 10 touch each other.

The chain works as follows.

In a straight chain movement, part of the arcuate sections 6 of the rolls 4 (Fig. 12) contact the arcuate sections 18 of the plates 3 of both the inner link 1 and the outer link 2. The straight ends 8 of the bald faces 5 and 10 of the roller 4 contact the straight ends 19 middle arcuate sections 17 plates 3 of the same links. Between the arcuate portions 6 and 7 of the roller 4, 16 and 17 of the plates 3 there is a gap. 45 Due to the stepped shape of the roller 4, its outer contour closes the side gaps between the roller 4 and the plate 3, which prevents the plates from moving off the roller (self-disassembling the circuit has been eliminated).

When the chain links rotate on the sprocket of the conveyor, the middle arcuate sections 17 of the working parts 15 of the holes 12 overlap along the concave part 7 of the lips 5 and 10 of the roller 4. The interlocking of the inner 1 and outer 2 chain links with

13 and at points A and D with profiled teeth of sprocket 9 occurs behind the rounded working part 15 of the figured horny ends of the plates 3. In this case, the roller 4 is stiffer 12. The size is determined constructively taking into account that Ki K2 than ensure that the chains self-align (float) between the middle arcuate portions 17 of the working parts of the 15 holes 12 of the plate: the tin 3 penetrates the equal strength of the plate.

The chain is assembled as follows.

The rollers 4 (FIG. 10), having flats 10, are inserted into the mounting holes 13 of the plates 3 of the inner link 1 and pushed them through the longitudinal slots 14 before entering the working parts 15 (FIG. 11) of the holes 12 of the plates 3. The rollers 4 unfold on 90 ° before the contact of the face 10 of the rollers 4 with the middle arcuate sections 17 (Fig. 8) of the working parts 15 of the holes 12.

The plates 3 of the outer link 2 are positioned at an angle of 90 ° to the plates 3 of the inner link 1 and in this position are put on the ends of the rollers 4 having flats 5, then the plates 3 of the outer link 2 are pushed until the roller 4 enters the working parts 15

holes 12 and rotate them 90 ° so that the straight end 19 of the middle arcuate portion 17 contacts the straight end 8 of the face 5 of the roller 4. In order to insert the next roller 4 simultaneously into the mounting holes 13 of the outer link 2 plates 3 and the next inner link 1. Next, the first assembly steps are repeated, with the result that the roller 4 with the bald heads 5 is placed in the working position inside the working parts 15 of the holes 13 of the plates 3 of the external link 2. Then the plates 3 of the internal link 1 are shifted by an average bald spot 10 roller 4 ivayut them at an angle of 90 ° relative to outer link plates 3 2,

promote them in that position until sunset

the roller 4 into the working parts 15 of the holes 12 and is turned 90 ° so that the straight ends 19 and 8 of the middle arcuate portion 17 of the plates 3 and the flats 10 touch each other.

The chain works as follows.

In a straight chain movement, part of the arcuate sections 6 of the rolls 4 (Fig. 12) contact the arcuate sections 18 of the plates 3 of both the inner link 1 and the outer link 2. The straight ends 8 of the bald faces 5 and 10 of the roller 4 contact the straight ends 19 middle arcuate sections 17 plates 3 of the same links. Between the arcuate portions 6 and 7 of the roller 4, 16 and 17 of the plates 3 there is a gap. Due to the stepped shape of the roller 4, its outer contour overlaps the side gaps between the roller 4 and the plate 3, which prevents the plates from moving off the roller (self-disassembly of the chain is eliminated).

When the chain links rotate on the sprocket of the conveyor, the middle arcuate sections 17 of the working parts 15 of the holes 12 overlap along the concave part 7 of the lips 5 and 10 of the roller 4. The interlocking of the inner 1 and outer 2 chain links with

teeth sprocket 9 occurs behind the rounded ends of the plates 3. In this case, the roller 4

 teeth sprocket 9 occurs behind the rounded ends of the plates 3. In this case, the roller 4

the chains self-align (float) between the middle arcuate sections 17 of the working parts 15 holes 12 of the plate: tin 3 of the inner 1 and outer 2 chain links, the rolling of the mating surfaces of the plates and the roller occurs without sliding. At the end of the rotation of the chain links at an angle at the arcuate portions 6 of the roller 4 contact the side arcuate portions 16 of the plates 3. The edge FI of the roller 4 coincides with the point F of conjugation of the arcuate portions 16 and 17.

Claims (3)

1. A chain drive containing a plate folding pull chain and sprockets in which the chain is made of roller-connected plates with two figured holes, each of which consists of an assembly circular part facing the center of the plate and connected to it by a longitudinal slit profiled the working part, the profile of which is formed by at least three adjoining arcuate sections, the middle of which is located opposite the longitudinal slot and is convex inside the working part of the hole, and the end of the middle The curved area is made straight and perpendicular to the longitudinal axis of the plate, characterized in that, in order to increase reliability, each roller of the chain is made with a groove and bald patches having mated flat and concave portions, two of the bald faces are located at the ends of the ralik on the one hand, and the third has a width equal to two lateral flats, and is located in the middle of the roller diametrically opposite to the lateral flats. 2. Transfer under item 1, characterized in that, in order to ensure the possibility of five 0 5 0 where R2 is the radius of the middle arcuate portion of the working part of the plate aperture; Z is the number of sprocket teeth; d is the diameter of the groove of the roller; B is the distance from the straight portion of the flat to the axis of symmetry of the roller. 3. Transfer by PP. 1 and 2, characterized in that, in order to enable the roller to roll over the middle arcuate portion of the working portion of the figured plate opening, the radius of the middle arc portion of the plate does not exceed the radius of curvature of the concave portion of the ridge and the roller is determined by the formula DF2 25di3 ( 2 g + / d d. / 2 R . Kg-, 2 where b is the distance from the straight portion of the flat to the axis of symmetry of the roller; d is the diameter of the groove of the roller; Z is the number of sprocket teeth.  V FIG. 2 | Aa -g srig.Z  / // / srie4-j R Bv G- cfiue.S / 7/5 18 13 / / 7 19/8 Fig.9  0 1 12 fia.yu / J FIG. but