Duplex chain wheel structure integrally formed through powder metallurgy

Abstract

The utility model relates to a duplex chain wheel structure integrally formed by powder metallurgy, which comprises a connecting sleeve, a large gear ring and a small gear ring, the connecting sleeve comprises an upper connecting cylinder and a lower connecting cylinder, the small gear ring is mounted on the periphery of the upper end of the upper connecting cylinder, an inner hole of the upper connecting cylinder is a cross-shaped through hole, the large gear ring is mounted on the bottom surface of the upper connecting cylinder, and the small gear ring is mounted on the bottom surface of the lower connecting cylinder. The lower connecting cylinder is connected with the bottom face of the large gear ring, vertically-through installation through holes are formed in the lower connecting cylinder and the large gear ring, key grooves are formed in the installation through holes, the installation through holes and the cross-shaped through hole are coaxial, and the area of the installation through holes is smaller than that of the cross-shaped through hole. The contact area of the transmission shaft and the cross-shaped through hole is large, and the connecting sleeve, the large gear ring and the small gear ring are of an integrated structure, so that when the transmission shaft operates, the cross-shaped through hole is a main stress position, the stress of the key groove is reduced, the key groove is prevented from being damaged due to stress, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sprocket production, in particular to a double-row sprocket structure formed by powder metallurgy in one piece. Background Art

[0002] Double-row sprockets refer to sprockets with double rows of gear teeth. The double-row sprockets currently produced by our factory are split-combination structures, including a transmission pinion and a transmission gear. The transmission pinion and transmission gear are formed by powder metallurgy, as shown in the attached figure of the manual. Figure 1 As shown in the figure, a cross-shaped positioning through hole is provided at the center of the transmission pinion, as shown in the figure of the specification Figure 2 As shown, a mounting through hole is provided at the center of the transmission gear, a keyway is provided at the mounting through hole, the transmission pinion and the transmission gear are assembled by bolt connection, the transmission shaft passes through the cross-shaped positioning through hole and the mounting through hole in sequence, and the positioning key on the transmission shaft cooperates with the keyway.

[0003] The existing double-row sprocket has the following disadvantages during use: ① It is a split combined structure, which needs to be assembled separately when used, which is inconvenient to use; ② When the transmission shaft is running, the force on the transmission gear is mainly concentrated on the keyway, which is easily damaged by the large force.

[0004] In order to solve the above technical problems, the inventors modified and upgraded the existing double-row sprockets and proposed a double-row sprocket structure formed in one piece by powder metallurgy. Utility Model Content

[0005] The utility model aims at the deficiencies of the prior art and provides a double-row sprocket structure formed in one piece by powder metallurgy.

[0006] The utility model is realized by the following technical scheme, and provides a double-row sprocket structure formed by powder metallurgy in one piece, comprising a connecting sleeve, a large gear ring and a small gear ring, wherein the connecting sleeve comprises an upper connecting sleeve and a lower connecting sleeve, the small gear ring is installed on the outer periphery of the upper end of the upper connecting sleeve, the inner hole of the upper connecting sleeve is a cross-shaped through hole, the large gear ring is installed on the bottom surface of the upper connecting sleeve, the lower connecting sleeve is connected to the bottom surface of the large gear ring, and an installation through hole that passes through from top to bottom is provided on the lower connecting sleeve and the large gear ring, a key groove is provided in the installation through hole, the installation through hole is coaxial with the cross-shaped through hole, and the area of ​​the installation through hole is smaller than that of the cross-shaped through hole.

[0007] Preferably, the connecting sleeve, the large gear ring and the small gear ring are integrally formed by powder metallurgy processing.

[0008] Preferably, in order to limit the chain on the large gear ring, a limiting plate is installed on the outer periphery of the lower end of the lower connecting cylinder, and the diameter of the limiting plate is larger than the diameter of the large gear ring.

[0009] Preferably, in order to reduce the weight of the limiting plate, four weight-reducing holes arranged along the circumference of the limiting plate are provided on the plate surface of the limiting plate.

[0010] Preferably, the limiting plate, the connecting sleeve, the large gear ring and the small gear ring are integrally formed by powder metallurgy processing.

[0011] Preferably, four threaded holes for fixing the transmission shaft are arranged on the upper connecting tube along its circumference.

[0012] The beneficial effects of the utility model are:

[0013] The contact area between the transmission shaft and the cross-shaped through hole is large. Since the connecting sleeve, large gear ring and small gear ring are an integrated structure, the cross-shaped through hole is the main force-bearing position when the transmission shaft is running, which reduces the force on the keyway, avoids damage to the keyway, and increases the service life. In addition, the overall structure is formed by powder metallurgy processing, and no secondary assembly is required during use, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of the existing transmission pinion;

[0015] Figure 2 It is a top view of the existing transmission gear;

[0016] Figure 3 It is a top view of the utility model;

[0017] Figure 4 yes Figure 3 Middle AA section view;

[0018] As shown in the figure:

[0019] 1. Small gear ring, 2. Large gear ring, 3. Limit plate, 4. Weight reduction hole, 5. Threaded hole, 6. Cross-shaped through hole, 7. Mounting through hole, 8. Keyway, 9. Lower connecting tube, 10. Upper connecting tube. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0021] like Figure 3-4 As shown, the utility model includes a connecting sleeve, a large gear ring 2 and a small gear ring 1, the connecting sleeve includes an upper connecting tube 10 and a lower connecting tube 9, the small gear ring 1 is installed on the outer periphery of the upper end of the upper connecting tube 10, the inner hole of the upper connecting tube 10 is a cross-shaped through hole 6, the large gear ring 2 is installed on the bottom surface of the upper connecting tube 10, the lower connecting tube 9 is connected to the bottom surface of the large gear ring 2, and a mounting through hole 7 that passes through from top to bottom is provided on the lower connecting tube 9 and the large gear ring 2, a keyway 8 is provided in the mounting through hole 7, the mounting through hole 7 is coaxial with the cross-shaped through hole 6, and the area of ​​the mounting through hole 7 is smaller than the cross-shaped through hole 6.

[0022] In this embodiment, the connecting sleeve, the large gear ring 2 and the small gear ring 1 are integrally formed by powder metallurgy processing.

[0023] In this embodiment, in order to limit the chain on the large gear ring 2, a limiting plate 3 is installed on the outer periphery of the lower end of the lower connecting tube 9, and the diameter of the limiting plate 3 is larger than the diameter of the large gear ring 2. In order to reduce the weight of the limiting plate 3, four weight reduction holes 4 arranged along the circumference of the limiting plate 3 are provided on the plate surface of the limiting plate 3.

[0024] In this embodiment, the limiting plate 3, the connecting sleeve, the large gear ring 2 and the small gear ring 1 are integrally formed by powder metallurgy processing.

[0025] In this embodiment, four threaded holes 5 for fixing the transmission shaft are arranged on the upper connecting tube 10 along its circumference.

[0026] When in use, the transmission shaft is passed through the cross-shaped through hole 6 and the installation through hole 7 in sequence, and the positioning key on the transmission shaft cooperates with the keyway 8. The contact area between the transmission shaft and the cross-shaped through hole 6 is large. Since the connecting sleeve, the large gear ring 2 and the small gear ring 1 are an integrated structure, when the transmission shaft is running, the cross-shaped through hole 6 is the main force position, which reduces the force on the keyway 8, avoids damage to the keyway 8, and improves the service life. In addition, the overall structure is formed by powder metallurgy processing, and no secondary assembly is required during use, which is convenient to use.

[0027] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-row sprocket structure integrally formed by powder metallurgy, characterized in that: It includes a connecting sleeve, a large gear ring and a small gear ring. The connecting sleeve includes an upper connecting sleeve and a lower connecting sleeve. The small gear ring is installed on the outer periphery of the upper end of the upper connecting sleeve. The inner hole of the upper connecting sleeve is a cross-shaped through hole. The large gear ring is installed on the bottom surface of the upper connecting sleeve. The lower connecting sleeve is connected to the bottom surface of the large gear ring. The lower connecting sleeve and the large gear ring are provided with mounting through holes that pass through from top to bottom. A key groove is provided in the mounting through hole. The mounting through hole is coaxial with the cross-shaped through hole, and the area of ​​the mounting through hole is smaller than that of the cross-shaped through hole.

2. The powder metallurgy integrally formed double-row sprocket structure according to claim 1, characterized in that: The connecting sleeve, the large gear ring and the small gear ring are integrally formed by powder metallurgy processing.

3. The powder metallurgy integrated double-row sprocket structure according to claim 1, characterized in that: A limiting plate is installed on the outer periphery of the lower end of the lower connecting cylinder, and the diameter of the limiting plate is greater than the diameter of the large gear ring.

4. The double-row sprocket structure integrally formed by powder metallurgy according to claim 3, characterized in that: Four weight-reducing holes arranged along the circumference of the limiting disk are arranged on the disk surface.

5. The powder metallurgy integrally formed double-row sprocket structure according to claim 4, characterized in that: The limiting plate, the connecting sleeve, the large gear ring and the small gear ring are integrally formed by powder metallurgy processing.

6. The powder metallurgy integrally formed double-row sprocket structure according to claim 1, characterized in that: Four threaded holes for fixing the transmission shaft are arranged on the upper connecting cylinder along its circumference.

Images