CN110617317A - Steel-aluminum combined chain wheel - Google Patents

Abstract

The invention relates to the field of chain wheels, in particular to a steel-aluminum combined chain wheel which comprises an inner ring and an outer ring. The invention mainly comprises an inner ring and an outer ring, wherein the wheel core of the inner ring is provided with a limiting mechanism and a matched extrusion mechanism, the wheel core clamps a limiting plate of the limiting mechanism in the inner ring of the outer ring through an extrusion plate of the extrusion mechanism and is fastened by a third bolt and a fourth bolt, so that the inner ring and the outer ring are connected together, when the sprocket of the outer ring is damaged, the limiting plate is pulled out of the inner ring of the outer ring, the third bolt and the fourth bolt are dismounted, and a new outer ring is replaced, so that the invention has the advantages of no need of integral replacement, low maintenance cost and economy.

Description

Steel-aluminum combined chain wheel

Technical Field

The invention relates to the field of chain wheels, in particular to a steel-aluminum combined chain wheel.

Background

The sprocket refers to a wheel with sprocket teeth, and is one of transmission parts in various machines.

The machine of field operation that uses precipitously on mountain road, drive the machine operation through sprocket drive, and the sprocket rusts easily in long-term humid environment operation, the fracture condition can appear in long-term use, the sprocket of sprocket damages easily, need whole the change, cost of maintenance is high, the sprocket of sprocket does not have protection machanism, the sprocket extensively applies to transportation equipment, it is precipitous on mountain road, need increase drive power, in the transmission process, the load of sprocket is great, the damage degree is big, short service life, and whole all adopts steel during the manufacturing of sprocket, and is heavy, be not convenient for transport.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a steel-aluminum combined chain wheel.

The technical scheme adopted by the invention for solving the technical problems is as follows: a steel-aluminum combined sprocket comprises an inner ring and an outer ring, wherein the inner ring is clamped inside the outer ring, the inner ring is made of aluminum alloy, a plurality of lightening holes are formed in the inner ring, the inner ring is composed of two wheel cores, a plurality of fourth bolts are detachably connected between the two wheel cores, the distances between every two adjacent fourth bolts are the same, a plurality of first grooves are formed in one side, away from the middle of the outer ring, of each two wheel cores, the first grooves formed in the same wheel core are arranged in a ring shape, two first sliding grooves and two second sliding grooves are formed in the inner side walls of the first grooves, the second sliding grooves are formed between the two first sliding grooves formed in the first grooves, the first sliding grooves and the second sliding grooves formed in the same first grooves are formed in the same horizontal plane, a limiting mechanism and an extruding mechanism are arranged inside the first grooves, the outer ring is made of 45# steel, and the front side and the rear side of the outer ring are both provided with fixing mechanisms.

The outer ring comprises a first fixing ring, a plurality of first screws are arranged at the front and rear parts of the first fixing ring, the same sides are adjacent to the first screws, the distance between the first screws is equal to the same side, the inner ring is fixed at the middle part of the circumferential inner side wall of the first fixing ring, a plurality of third screws are arranged on the outer side wall of the front and rear parts of the inner ring, the same sides are adjacent to the third screws, the distance between the third screws is equal to the same side, a plurality of first clamping grooves are arranged at the front and rear parts of the circumferential inner side wall of the first fixing ring, the same sides are adjacent to the first clamping grooves, the same sides are arranged at the same side, the number of first grooves formed in the first clamping grooves and the wheel core is equal to the same, the first grooves correspond to the wheel core, the chain teeth are fixedly connected to the outer side wall of the circumference of the first fixing ring.

Specifically, the fixing mechanism comprises a second fixing ring, the outer diameter and the inner diameter of the second fixing ring are the same as those of the first fixing ring, one side of the second fixing ring, which is close to the first fixing ring, is provided with a plurality of second clamping grooves, the same second clamping grooves are arranged in a ring shape, the distance between two adjacent second clamping grooves arranged on the same second fixing ring is the same, the number of the second clamping grooves on the same side is the same as that of the first clamping grooves, the first clamping grooves are in one-to-one correspondence, one side of the second fixing ring, which is close to the first fixing ring, is provided with a plurality of through holes, the same through holes are arranged in a ring shape, the distance between two adjacent through holes arranged on the same second fixing ring is the same, the number of the through holes on the same side is the same as that of the first screw holes, and the number of the through holes on the same side is the same, the second bolts are inserted into the through holes, penetrate through the through holes and extend into the corresponding first screw holes, and a plurality of tooth sheets are fixedly connected to the outer circumferential side wall of the second fixing ring.

Specifically, it is same that the distance between two adjacent teeth that sets up on the solid fixed ring of second is the same, singly the same and the one-to-one with the quantity of sprocket of the tooth quantity that sets up on the solid fixed ring of second, all insert on the tooth and be equipped with first bolt, first bolt all passes the place tooth and all extends to the inside of the second screw that corresponds.

Specifically, stop gear includes the push pedal, the equal fixedly connected with limiting plate in one side middle part that the push pedal is close to homonymy second spout, the equal sliding connection of limiting plate is in the inside second spout that sets up in the first recess in place, one side that the limiting plate kept away from the wheel core middle part in place all passes the inside of the first recess in place and all extends to the inside of the first draw-in groove and the second draw-in groove that correspond, the equal fixedly connected with slide in both sides of limiting plate, the equal sliding connection of slide is in the inside of homonymy first spout, one side that push pedal and first recess are close to homonymy wheel core middle part all is equipped with the slot.

The extrusion mechanism comprises an extrusion plate, the upper end and the lower end of the extrusion plate are both provided with a through groove, the upper end and the lower end in the interior of the extrusion plate are both provided with a sliding cavity, the inside of the sliding cavity is connected with a plug board in a sliding mode, one end of the plug board, which is far away from the middle part of the extrusion plate, is passed through the through groove in the same side and is extended into the slot in the same side, the plug board is close to one side of the middle part of the wheel core, and is fixedly connected with compression springs, the compression springs are far away from the one end of the plug board, and the compression springs.

The inserting plate is of an L-shaped structure, one end, close to the middle of the extruding plate, of the inserting plate penetrates through the inside of the sliding cavity and extends to the outside of the extruding plate, and the end, located outside the extruding plate, of the inserting plate is provided with a second groove.

Specifically, two the lateral wall of wheel core all inserts and is equipped with a plurality of third bolts, homonymy the quantity and the equal just one-to-one of third screw quantity of third bolt are same, and is same the third bolt that sets up on the wheel core all is the loop type setting, and is same distance between two adjacent third bolts that set up on the wheel core is the same, the third bolt all passes the place wheel core and all extends to inside the third screw that the homonymy corresponds.

The invention has the beneficial effects that:

(1) according to the steel-aluminum combined sprocket, the wheel core of the inner ring is provided with the limiting mechanism and the matched extrusion mechanism, the wheel core clamps the limiting plate of the limiting mechanism in the inner ring of the outer ring through the extrusion plate of the extrusion mechanism, and the third bolt and the fourth bolt are used for fastening, so that the inner ring and the outer ring are connected together, when the sprocket of the outer ring is damaged, only the limiting plate needs to be pulled out of the inner ring of the outer ring, the third bolt and the fourth bolt are detached, and a new outer ring is replaced without integral replacement, so that the maintenance cost is low, the steel-aluminum combined sprocket is economical, and the problems that at present, most sprockets used in machinery are integrally formed, the time of machinery working is long, the sprocket of the sprocket is easy to damage, and the sprocket needs to be integrally replaced are solved.

(2) According to the steel-aluminum combined sprocket, the fixing mechanism is arranged on the first fixing ring, when the steel-aluminum combined sprocket works, the second fixing ring and the tooth sheets of the fixing mechanism can reinforce the sprockets on the outer ring, so that the load of the sprockets is reduced, and the sprockets are prevented from being easily damaged due to large load, so that the purpose of prolonging the service life of the sprockets is achieved, and the problems that the sprockets of the sprocket are not provided with a protection mechanism, the loads of the sprockets are large, the sprockets are easily damaged and the service life is short in the transmission process are solved.

(3) According to the steel-aluminum combined sprocket, the outer ring is made of 45# steel, the inner ring is made of aluminum alloy, the strength of the sprocket is improved, the weight of the sprocket is reduced, the sprocket can be conveniently transported, and the problems that the sprocket is large in weight and inconvenient to transport due to the fact that steel is adopted in the whole sprocket during manufacturing are solved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a steel-aluminum composite sprocket provided by the invention;

FIG. 2 is a sectional view taken at A in FIG. 1 of a steel aluminum composite sprocket according to the present invention;

FIG. 3 is a schematic structural view of an inner ring of a steel-aluminum composite sprocket provided by the invention;

FIG. 4 is a schematic structural view of an outer ring of a steel-aluminum composite sprocket provided by the invention;

FIG. 5 is a schematic structural view of a steel-aluminum combined sprocket limiting mechanism provided by the invention;

FIG. 6 is a schematic structural diagram of a steel-aluminum combined sprocket extrusion plate provided by the invention;

FIG. 7 is a schematic structural view of a steel-aluminum combined sprocket insert plate provided by the invention;

FIG. 8 is a schematic structural view of a second fixing ring of the steel-aluminum composite sprocket provided by the invention.

In the figure: 1. an inner ring; 2. an outer ring; 21. a first retaining ring; 22. an inner ring; 23. a third screw hole; 24. a first card slot; 25. a first screw hole; 26. a sprocket; 27. a second screw hole; 3. a wheel core; 4. a first groove; 5. a limiting mechanism; 51. pushing the plate; 52. a slide plate; 53. a limiting plate; 54. a slot; 6. an extrusion mechanism; 61. a pressing plate; 62. a slide chamber; 63. a through groove; 64. inserting plates; 65. a second groove; 66. a compression spring; 7. a first chute; 8. a second chute; 9. a fixing mechanism; 91. a second retaining ring; 92. a tooth sheet; 93. a first bolt; 94. a through hole; 95. a second bolt; 96. a second card slot; 10. lightening holes; 11. a third bolt; 12. and a fourth bolt.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-8, the steel-aluminum combined sprocket comprises an inner ring 1 and an outer ring 2, wherein the inner ring 1 is clamped inside the outer ring 2, the inner ring 1 is made of aluminum alloy, a plurality of lightening holes 10 are formed in the inner ring 1, the inner ring 1 is composed of two wheel cores 3, a plurality of fourth bolts 12 are detachably connected between the two wheel cores 3, the distances between every two adjacent fourth bolts 12 are the same, a plurality of first grooves 4 are formed in one side of each of the two wheel cores 3 away from the middle of the outer ring 2, a plurality of first grooves 4 formed in the same wheel core 3 are arranged in a ring shape, two first sliding grooves 7 and two second sliding grooves 8 are formed in the inner side wall of each first groove 4, each second sliding groove 8 is located between two first sliding grooves 7 formed in the first groove 4, and the first sliding grooves 7 and the second sliding grooves 8 formed in the same first groove 4 are located on the same horizontal plane, the inner portion of the first groove 4 is provided with a limiting mechanism 5 and an extruding mechanism 6, the outer ring 2 is made of 45# steel, and the front side and the rear side of the outer ring 2 are provided with fixing mechanisms 9.

Specifically, the outer ring 2 includes a first fixing ring 21, the front and rear portions of the first fixing ring 21 are provided with a plurality of first screw holes 25, the distances between two adjacent first screw holes 25 on the same side are the same, the middle portion of the circumferential inner side wall of the first fixing ring 21 is fixed with an inner ring 22, the front and rear outer side walls of the inner ring 22 are provided with a plurality of third screw holes 23, the distances between two adjacent third screw holes 23 on the same side are the same, the front and rear portions of the circumferential inner side wall of the first fixing ring 21 are provided with a plurality of first clamping grooves 24, the distances between two adjacent first clamping grooves 24 on the same side are the same, the first clamping grooves 24 on the same side and the first grooves 4 on the wheel core 3 are the same in number and correspond to each other, the circumferential outer side wall of the first fixing ring 21 is fixedly connected with sprockets 26, and the distances between two adjacent sprockets 26 are the same, the front and the rear parts of the sprocket 26 are provided with second screw holes 27, so that the outer ring 2 can be conveniently replaced when the sprocket 26 is damaged, and the maintenance cost is saved.

Specifically, the fixing mechanism 9 includes a second fixing ring 91, the outer diameter and the inner diameter of the second fixing ring 91 are the same as those of the first fixing ring 21, one side of the second fixing ring 91, which is close to the first fixing ring 21, is provided with a plurality of second clamping grooves 96, the same side of the second fixing ring 91 is provided with a plurality of second clamping grooves 96, the plurality of second clamping grooves 96 are arranged in a ring shape, the distance between two adjacent second clamping grooves 96 arranged in the same second fixing ring 91 is the same, the number of the second clamping grooves 96 and the number of the first clamping grooves 24 are the same and are in one-to-one correspondence, one side of the second fixing ring 91, which is close to the first fixing ring 21, is provided with a plurality of through holes 94, the same side of the second fixing ring 91 is provided with a plurality of through holes 94, the distance between two adjacent through holes 94 arranged in the same second fixing ring 91 is the same, the homonymy the quantity of through-hole 94 and the quantity of first screw 25 are the same and the one-to-one, second bolt 95 has all been inserted to the inside of through-hole 94, second bolt 95 all passes place through-hole 94 and all extends to the inside of the first screw 25 that corresponds, all fixedly connected with a plurality of tooth pieces 92 on the solid fixed ring 91's of second circumference lateral wall, tooth piece 92 can be consolidated sprocket 26, prolongs sprocket 26's life.

Specifically, the same distance between two adjacent tooth plates 92 arranged on the second fixing ring 91 is the same, the number of the tooth plates 92 arranged on the second fixing ring 91 is the same as that of the sprockets 26, the tooth plates 92 are in one-to-one correspondence, first bolts 93 are inserted into the tooth plates 92, the first bolts 93 penetrate through the tooth plates 92 and extend into the corresponding second screw holes 27, and the tooth plates 92 are fixed on the corresponding sprockets 26 conveniently.

Specifically, stop gear 5 includes push pedal 51, push pedal 51 is close to the equal fixedly connected with limiting plate 53 in one side middle part of homonymy second spout 8, the equal sliding connection of limiting plate 53 is in the inside second spout 8 that sets up of the first recess 4 in place, the limiting plate 53 is kept away from the inside of the first recess 4 in place and is all passed in one side in place 3 middle part and all extended to the inside of the first draw-in groove 24 and the second draw-in groove 96 that correspond, the equal fixedly connected with slide 52 in both sides of place limiting plate 53, the equal sliding connection of slide 52 is in the inside of the first spout 7 of homonymy, push pedal 51 and one side that first recess 4 is close to homonymy wheel core 3 middle part all are equipped with slot 54, the installation of the inner ring 1 of.

Specifically, extrusion mechanism 6 includes stripper plate 61, the upper and lower end of stripper plate 61 all is equipped with logical groove 63, the lower extreme all is equipped with smooth chamber 62 in the inside of stripper plate 61, the equal sliding connection in inside of smooth chamber 62 has picture peg 64, the one end that picture peg 64 kept away from place stripper plate 61 middle part all passes the inside that the same side led to groove 63 and all extends to homonymy slot 54, picture peg 64 is close to the equal fixedly connected with compression spring 66 in one side at the middle part of place wheel core 3, the equal fixed connection of one end that compression spring 66 kept away from place picture peg 64 is on the inside wall at the first recess 4 in place, is convenient for fix the position of limiting plate 53 to limiting plate 53 extrudes in the inside of first draw-in groove 24 and second draw-in groove 96.

Specifically, picture peg 64 all is L type structure, the one end that picture peg 64 is close to the middle part of the extrusion board 61 passes the inside of place smooth chamber 62 and all extends to the outside of place extrusion board 61, the one end that picture peg 64 is located the outside of place extrusion board 61 all is equipped with second recess 65, the slide picture peg 64 of being convenient for.

Specifically, two the lateral wall of wheel core 3 all inserts and is equipped with a plurality of third bolts 11, homonymy the quantity and the third screw 23 quantity homogeneous phase and the one-to-one of third bolt 11 are same, and is same the third bolt 11 that sets up on the wheel core 3 all is the loop type setting, and is same distance homogeneous phase between two adjacent third bolts 11 that set up on the wheel core 3, third bolt 11 all passes place wheel core 3 and all extends to inside the third screw 23 that the homonymy corresponds, is convenient for fix inner ring 1 on outer loop 2.

When in use, because the front and the rear parts of the first fixing ring 21 are provided with the fixing mechanisms 9, the second fixing ring 91 and the toothed sheets 92 of the fixing mechanism 9 can reinforce the sprockets 26 on the first fixing ring 21, reduce the load of the sprockets 26, and prevent the sprockets 26 from being easily damaged due to large load, thereby achieving the purpose of prolonging the service life of the sprockets 26, if the sprockets 26 are damaged, the invention is mechanically disassembled, the third bolt 11 and the fourth bolt 12 are sequentially disassembled by using a tool, fingers are inserted into the second groove 65 arranged on the inserting plate 64, the inserting plate 64 is pulled out from the inside of the inserting groove 54, the squeezing plate 61 is simultaneously pulled out from the inside of the first groove 4, the limiting plate 53 is pulled out from the inside of the first clamping groove 24 and the second clamping groove 96 by using the pushing plate 51, and then the steps are repeated to take out and pull out the other squeezing mechanisms 6 from the inside of the first groove 4, then, the wheel core 3 can be detached from the inner ring 22 of the outer ring 2, then the first bolt 93 and the second bolt 95 are sequentially detached, the second fixing ring 91 is detached from the first fixing ring 21, a new outer ring 2 is replaced, if the teeth 92 on the second fixing ring 91 are damaged, the second fixing ring 91 with new teeth 92 can be replaced at the same time, the second fixing ring 91 with new teeth 92 is fixed on the new outer ring 2 by using the first bolt 93 and the second bolt 95, the first locking groove 24 on the first fixing ring 21 is aligned with the second locking groove 96 on the second fixing ring 91, then the wheel core 3 is covered on the new outer ring 2, the third bolt 11 and the fourth bolt 12 are installed back on the wheel core 3, the limiting plate 53 is inserted into the corresponding first locking groove 24 and the corresponding second locking groove 96 at this time, one of the extrusion plates 61 is taken out, the extrusion plate 64 arranged inside the extrusion plate 61 is completely extruded into the sliding cavity 62 where the insertion plate is located, at the moment, the compression spring 66 connected with the inserting plate 64 is in a compressed state, the extrusion plate 61 is clamped in one of the first grooves 4, the extrusion plate 61 is clamped between the inserting plate 64 and the inner side wall of the first groove 4, then the inserting plate 64 is loosened, the inserting plate 64 can be bounced into the same-side slot 54 under the elastic action of the compression spring 66, so that the extrusion plate 61 is fixed in the first groove 4, then the steps are repeated, other extrusion mechanisms 6 are installed, the inner ring 1 and the outer ring 2 are fixed together, and then the invention is installed back to the interior of the machine.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A steel-aluminum combined sprocket comprises an inner ring (1) and an outer ring (2), and is characterized in that the inner ring (1) is clamped inside the outer ring (2), the inner ring (1) is made of aluminum alloy, a plurality of lightening holes (10) are formed in the inner ring (1), the inner ring (1) is composed of two wheel cores (3), a plurality of fourth bolts (12) are detachably connected between the two wheel cores (3), the distances between every two adjacent fourth bolts (12) are the same, a plurality of first grooves (4) are formed in one sides, away from the middle of the outer ring (2), of the two wheel cores (3), the same plurality of first grooves (4) formed in the wheel cores (3) are arranged in a ring shape, two first chutes (7) and a second chute (8) are formed in the inner side wall of each first groove (4), and the second chute (8) is located between the two first chutes (7) formed in the first grooves (4), same first spout (7) and second spout (8) that first recess (4) inside set up all are located same horizontal plane, the inside of first recess (4) all is equipped with stop gear (5) and extrusion mechanism (6), outer loop (2) are made by 45# steel, the side all is equipped with fixed establishment (9) around outer loop (2).

2. The steel-aluminum composite sprocket as set forth in claim 1, wherein: the outer ring (2) comprises a first fixing ring (21), a plurality of first screw holes (25) are formed in the front and rear parts of the first fixing ring (21), the distances between every two adjacent first screw holes (25) on the same side are the same, an inner ring (22) is fixed in the middle of the circumferential inner side wall of the first fixing ring (21), a plurality of third screw holes (23) are formed in the front and rear outer side walls of the inner ring (22), the distances between every two adjacent third screw holes (23) on the same side are the same, a plurality of first clamping grooves (24) are formed in the front and rear parts of the circumferential inner side wall of the first fixing ring (21), the distances between every two adjacent first clamping grooves (24) on the same side are the same, the first clamping grooves (24) on the same side are identical to the first grooves (4) arranged on the wheel core (3), and the chain teeth (26) are fixedly connected to the circumferential outer side wall of the first fixing ring (21), the distances between every two adjacent sprockets (26) are the same, and second screw holes (27) are formed in the front portion and the rear portion of each sprocket (26).

3. The steel-aluminum composite sprocket as set forth in claim 1, wherein: the fixing mechanism (9) comprises a second fixing ring (91), the outer diameter and the inner diameter of the second fixing ring (91) are the same as those of the first fixing ring (21), one side, close to the first fixing ring (21), of the second fixing ring (91) is provided with a plurality of second clamping grooves (96), the plurality of second clamping grooves (96) arranged on the same second fixing ring (91) are arranged in a ring shape, the distance between every two adjacent second clamping grooves (96) arranged on the same second fixing ring (91) is the same, the quantity of the second clamping grooves (96) and the quantity of the first clamping grooves (24) are the same and are in one-to-one correspondence, one side, close to the first fixing ring (21), of the second fixing ring (91) is provided with a plurality of through holes (94), and the plurality of through holes (94) arranged on the same second fixing ring (91) are arranged in a ring shape, it is same the distance between two adjacent through-holes (94) that set up on the solid fixed ring of second (91) is the same, the homonymy the quantity of through-hole (94) and the quantity homogeneous phase and the one-to-one of first screw (25), the inside of through-hole (94) is all inserted and is equipped with second bolt (95), second bolt (95) all pass place through-hole (94) and all extend to the inside of the first screw (25) that corresponds, equal a plurality of teeth piece (92) of fixedly connected with on the circumference lateral wall of the solid fixed ring of second (91).

4. A steel aluminum composite sprocket as set forth in claim 3, wherein: same distance between two adjacent teeth (92) that set up on the solid fixed ring of second (91) is all the same, single tooth (92) quantity that sets up on the solid fixed ring of second (91) is all the same and the one-to-one with the quantity of sprocket (26), all insert on tooth (92) and be equipped with first bolt (93), first bolt (93) all pass place tooth (92) and all extend to the inside of the second screw (27) that correspond.

5. The steel-aluminum composite sprocket as set forth in claim 1, wherein: stop gear (5) are including push pedal (51), push pedal (51) are close to the equal fixedly connected with limiting plate (53) in one side middle part of homonymy second spout (8), the equal sliding connection of limiting plate (53) is in the inside second spout (8) that sets up in place first recess (4), one side at place wheel core (3) middle part is kept away from in limiting plate (53) all passes the inside of place first recess (4) and all extends to the inside of corresponding first draw-in groove (24) and second draw-in groove (96), the equal fixedly connected with slide (52) in both sides of place limiting plate (53), the equal sliding connection of slide (52) is in the inside of homonymy first spout (7), one side that push pedal (51) and first recess (4) are close to homonymy wheel core (3) middle part all is equipped with slot (54).

6. The steel-aluminum composite sprocket as set forth in claim 1, wherein: extrusion mechanism (6) are including stripper plate (61), the upper and lower end of stripper plate (61) all is equipped with logical groove (63), the lower extreme all is equipped with smooth chamber (62) on the inside of stripper plate (61), the equal sliding connection in inside of smooth chamber (62) has picture peg (64), picture peg (64) are kept away from the one end in place stripper plate (61) middle part and are all passed the inside that the homonymy led to groove (63) and all extend to with side slot (54), picture peg (64) are close to the equal fixedly connected with compression spring (66) in one side at wheel core (3) middle part, the equal fixed connection in one end at the first recess (4) in place of keeping away from picture peg (64) is compressed spring (66).

7. The steel-aluminum composite sprocket as set forth in claim 6, wherein: the picture peg (64) all are L type structure, the inside of place sliding chamber (62) is passed and all extend to the outside of place stripper plate (61) to picture peg (64) one end near place stripper plate (61) middle part, picture peg (64) are located the outside one end of place stripper plate (61) and all are equipped with second recess (65).

8. The steel-aluminum composite sprocket as set forth in claim 1, wherein: two the lateral wall of wheel core (3) all inserts and is equipped with a plurality of third bolt (11), homonymy the quantity and the third screw (23) quantity homogeneous phase and the one-to-one of third bolt (11) are same, and is same third bolt (11) that set up on wheel core (3) all are the loop type setting, and are same the distance homogeneous phase between two adjacent third bolt (11) that set up on wheel core (3), third bolt (11) all pass place wheel core (3) and all extend to inside third screw (23) that the homonymy corresponds.