Chain gear

FIELD: machine building.

SUBSTANCE: invention refers to general machine building and can be implemented in any of its branches where mechanic gears of rotary motion are used. The chain gear consists of two or more wheels-gears connected with chain (3). The gear corresponds to a unit wherein gear rim (K) consists of a set of separate sector parts connected with disk (4) of a gear with fit ring (6). Connections of gear rim (K) with disk (4) and fit ring (6) contain a system of slots and lugs facilitating adjustment of diametre of initial circumference of the gear and consequently its step bringing it to correspondence with the step of the chain by its wear. Adjustment is carried out with angular turn of the disk relative to the fit ring with tap wrench (8) with gear.

EFFECT: increased operation life of chain, reduced cost for spare chains for facilitation of required resource of chain gear.

6 dwg

 

The present invention relates to mechanical engineering and can be used in any area with the use of mechanical transmission of rotational motion.

In the technique is widely known mechanical transmission of rotational motion through a chain transmission comprising two or more wheels is a sprocket connected by a chain, see, for example, the book of Kudriavtseva NR. "Machinery" printing machinery", , Leningrad, 1980, UDC 621.81.

In the chain transfer rotation of the drive sprocket is converted into rotation driven by clutch chain with the sprocket teeth. Advantages of chain drives compared to, for example, the belt is the absence of slippage, compactness, reduced load on the shafts and bearings, constant gear ratio. But along with advantages there are also disadvantages, one of which is the elongation of the chain due to wear of its hinges and stretching of plates, which leads to an increase of the step chain and the inconsistency of her step step asterisks. Imagine that during operation of the chain transfer step between the rollers is increased by the value of "Δ". The chain, in most cases, covers an asterisk approximately half of the circumference of the initial diameter, engages the chain will be a significant number of teeth of the stars is his, this discrepancy in engagement with the circuit of the first and last tooth sprocket will be the value Δn, where n is the number of sprocket teeth being in engagement with the rollers, and may therefore be large. This mismatch leads to disruption of engagement and descent of the chain with the sprocket during operation of the transmission, which makes it unsuitable for further operation long before there will be a complete chain wear.

In the proposed chain transfer eliminates the above drawback of the known constructions of chain drives while retaining all of its advantages lies in the fact that in the design of the sprocket introduces a mechanism to adjust its step and aligned with the step chain as it wears. This allows to significantly increase the resource utilization circuit with preservation of normal gearing up to complete her wear.

The proposed construction of a chain presented in figure 1-6.

Figure 1 shows a General view of a chain drive consisting of two sprockets 1, 2, connected by a chain 3.

Figure 2 shows cross section a-a sprocket 1 with a chain 3.

Figure 3 shows cross-section B-B at the junction of the disk 4 with a ring gear To a ledge "e" in the form of an Archimedean spiral.

Figure 4 shows a view along arrow b on the gear and on the clamping ring 6 with its casticin the m digging, showing lateral side of the sector parts 5 of the ring gear, with radially oriented depressions J.

Figure 5 shows a view along arrow b on the crown gear and the clamping ring 6 at stage 5, see below, the technological process of manufacturing an asterisk (basting sections L of the crown To the stars on the private sector side).

Figure 6 shows, for clarity, in the axonometric image in the extended position, all components of the sprocket.

The essence of the proposed chain of transmission is as follows. In chain transfer, figure 1, consisting of stars 1 and 2, connected by a chain 3, asterisk represents an Assembly unit comprising a disk 4, figure 2, the clamping ring 6, between which is sandwiched gear, consisting of private sector 5 parts, each of which has one or several teeth, figure 3. On the side surface of the disk 4, the mating with the gear ring is formed of a protrusion or groove e in the form of an Archimedean spiral, incoming engages with the corresponding groove or protrusion on the side surface of the ring gear. On the lateral surface of the clamping ring 6, mating with a gear wreath, made of evenly spaced protrusions or depressions W, oriented radially included in engagement with corresponding depressions or protrusions on the other b is a similar surface of the ring gear, one for each sector part 5. On the inner diameter of the clamping ring 6 is made gear "δ", figure 4, and the disk 4 with offset L with respect to the crown of the clamping ring to the axis of the sprocket made the hole "b" for installation of the crank 8, figure 2, with the gear ”∂”meshing with a ring gear of the clamping ring 6, providing the angular spread of the clamping ring 6 relative to the disk 4 while adjusting. For angular displacement, in the place of installation fasteners 7 prijemnom ring 6 is made of an oblong grooves "a", figure 4, oriented tangentially. The disk 4 and the clamping ring 6 is centered between the collar N, 2.

The work of the proposed chain of transmission does not differ from known, however, due to the design of the sprocket, which allows the wear of the chain and pulling her chains, resulting in the increase step, to provide a corresponding increase of the step at the stars and save so normal gearing, and means to increase service life of the chain, until it is completely worn.

This is achieved as follows.

1. Loosen the fastening screws 7, figure 2, the tightening ring gear To between the disk 4 and the holding ring 6.

2. In hole "b" of the disk 4 sets t-bar 8 with the gear "∂", which is in engagement with subcutaneo "δ" of the clamping ring 6, figure 4.

3. The crank 8 is turned in the direction of arrow "g", while the clamping ring 6 is rotated relative to the disk 4 by the arrow "and" at some angle α, and the sector portion 5 of the ring gear, connected to the holding ring 6 radially oriented projections or depressions W, at the same time rotated the same angle and rise to the larger diameter, the position of M, figure 3, so as pie part 5, being in engagement with the tab "e" drive 4, move along it in the direction of increasing diameter along an Archimedean spiral by the same amount. Thus, the diameter D, Fig 1 initial circumference of the sprocket increases, and hence it step between the teeth. Rotation of the clamping ring 6 is produced up until step sprocket will not fit step chain.

4. When you are finished adjusting the crank 8 is pulled out of the hole, and this position of the ring gear To lock the tightening of screws 7, 2.

Chain transfer is again ready for further operation. Repeating periodically, as the wear on the chain, the pitch adjustment sprocket, see above, in accordance with the increase of the step chain, you can save the normal transmission gearing up to complete the chain wear. This results in a substantial increase in service life of the chain.

Not to mention that the proposed device chain of transmission is lainee known, however, its use is justified because it allows to reduce the cost of manufacture of spare circuits providing the requested resource is a chain.

The manufacturer of the proposed design stars difficult, but feasible, the technology of its production can be presented in the following sequence.

1. Make the disk 4 and the clamping ring 6, with holes and grooves for installation of fasteners 7, figure 2, is not performed.

2. Used for the procurement of the ring gear To that does not cut the teeth and does not cut into separate parts, but produce the final surface mating with the disk 4 and the holding ring 6.

3. Assemble the disc 4, the workpiece gear To and the clamping ring 6, combining their grooves and protrusions "e" and "W". Tighten the assembled package of technological clamps, after which the disk 4 and prijemnom ring 6 perform joint processing of holes for mounting fasteners 7. The holes are installing fasteners 7, tighten the pack, releasing technological clamp.

4. Produce cutting teeth on the ring gear K.

5. Make the notches L in the valleys between the sprocket teeth, indicating the boundaries of the sector portions 5 so that the incision depth h were performed on the outer diameters of the disk 4, and so imnam ring 6, figure 5.

6. Make labeling each sector part 5, indicating their location on a circle and bind to its position on the disk 4 and prijemnom ring 6.

7. Produce disassembly stars, freeing rims K.

8. Targeted to the cutting locations L, figure 5, to produce the cutting of the ring gear To the private sector part 5.

9. Holes in prijemnom ring 6 for installation of fasteners 7 (SMP) is cut in oblong slots "a", figure 4.

10. Produce the final Assembly of the disk 4, sector 5 parts, the clamping ring 6 in accordance with the marking (item 6) and tighten their fasteners 7.

Asterisk ready.

Chain transmission containing two or more wheels is a sprocket connected by a chain, in which the asterisk is a disk on the outer diameter of which is made gear, which engages with the rollers, characterized in that the gear sprocket is made separately from the disk and consists of a set of separate sectoral parts, each of which has one or more teeth, ring gear side surfaces pressed against one side of the disk, the other party to the clamping ring, disc and clamping ring is centered between the mounting flange and connected fasteners, while on the side the surface resistivity is proposed with a ring gear, formed groove or protrusion in the form of an Archimedean spiral, incoming engages with mating protrusions or grooves on the lateral surface of the ring gear, on the side surface of the clamping ring, mating with a gear wreath made projections or depressions, evenly spaced around the circumference and oriented radially included in engagement with corresponding depressions or protrusions on the other side surface of the ring gear, one on each sector portion, the inner diameter of the clamping ring made of crown gear and drive with an offset from the crown of the clamping ring to the axis of the sprocket made a hole for installation of the crank with gear included in engagement with the teeth of the clamping ring, providing the angular spread of the clamping ring relative to the disk while adjusting and installing fasteners in prijemnom the ring is made of elongated slots oriented tangentially.



 

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