Detachable composite worm

Abstract

A detachable composite worm comprises a shaft part and spiral teeth, a transmission part coaxial with the shaft part is arranged on the left side of the shaft part, and the spiral teeth are arranged on the transmission part. A positioning hole is formed in the center of the right end surface of the transmission part; a positioning part matched with the positioning hole is arranged in the center of the left end surface of the shaft part; an inner positioning conical surface with a narrow left part and a wide right part is arranged on the inner wall of the positioning hole; an outer positioning conical surface attached to the inner positioning conical surface is arranged on the outer wall of the positioning part; the right end face of the transmission part is attached to the left end face of the shaft part. An annular supporting part is arranged on the outer wall of the right end of the transmission part; a connecting part attached to the right side wall of the supporting part is arranged on the outer wall of the left end of the shaft part. The connecting part and the supporting part are fixed through a limiting structure. According to the detachable composite worm, the spiral teeth can be independently replaced under the condition that the spiral teeth are damaged, the whole worm does not need to be replaced, and the maintenance cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to a worm gear, and more particularly to a detachable composite worm gear. Background Technology

[0002] Worm gear drives, as a key technology in the field of mechanical transmission, are widely used in lifting equipment, elevators, industrial machinery and other fields due to their advantages of single-stage large reduction ratio, self-locking characteristics and spatial interleaved shaft transmission. Traditional worm gears adopt an integral structure, that is, the helical teeth and the shaft are formed as one piece by turning or grinding. However, this structure has significant defects in practical applications.

[0003] During worm gear transmission, the helical tooth surface and the worm wheel tooth surface are continuously subjected to high-stress sliding friction. Especially under heavy load, high speed or poor lubrication conditions, the helical tooth is prone to pitting, scuffing or excessive wear. Since the helical tooth and the shaft are a rigid integral structure, when the helical tooth is damaged (such as tooth surface peeling or tooth profile distortion) and causes abnormal transmission noise, vibration or loss of accuracy, even if the shaft is intact, the entire worm needs to be replaced. This results in 60%-70% of the value of the intact shaft material being discarded, ultimately leading to increased maintenance costs. Summary of the Invention

[0004] The present invention aims to solve the existing technical problem by providing a detachable composite worm gear that allows for individual replacement of the helical teeth when they are damaged, without replacing the entire worm gear, thus effectively reducing maintenance costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] This utility model discloses a detachable composite worm gear, including a shaft and helical teeth. The shaft has a coaxial transmission part on its left side, and the helical teeth are disposed on the transmission part. A positioning hole is provided at the center of the right end face of the transmission part. A positioning part matching the positioning hole is provided at the center of the left end face of the shaft. An inner positioning cone surface, narrower on the left and wider on the right, is provided on the inner wall of the positioning hole. An outer positioning cone surface that fits against the inner positioning cone surface is provided on the outer wall of the positioning part. The right end face of the transmission part fits against the left end face of the shaft. An annular support part is provided on the outer wall of the right end of the transmission part. A connecting part that fits against the right side wall of the support part is provided on the outer wall of the left end of the shaft. The connecting part and the support part are fixed together by a limiting structure.

[0007] The limiting structure includes several connecting holes evenly arranged circumferentially on the connecting part; the right side wall of the support part is provided with several limiting rods that match the connecting holes; the right end of the limiting rod extends to the outside of the connecting hole and is provided with a first locking hole that penetrates it radially; the outer wall of the left end of the shaft part is provided with several second locking holes that are coaxial with the first locking holes; a locking rod passes through the first locking hole and enters into the second locking hole, with the inner end face of the locking rod fitting against the bottom of the second locking hole; the outer end of the locking rod is provided with a limiting head; the support part is provided with a locking structure that matches the limiting head, and the locking structure can restrict the limiting head from moving away from the axis of the shaft part in the radial direction.

[0008] The locking structure includes an annular threaded joint extending to the right from the outer edge of the right side wall of the support part; a locking cover covering the limiting head is screwed into the annular threaded joint, and the inner circumferential surface of the locking cover is in contact with the limiting head; the locking cover has a shaft hole at its center that matches the shaft part.

[0009] The outer edge of the right side wall of the connecting part is provided with several locking notches that match the limiting head; the outer end face of the limiting head is coplanar with the outer peripheral surface of the connecting part.

[0010] The outer peripheral surface of the support part and the outer wall of the transmission part are connected by a support cone surface that is narrower on the left and wider on the right.

[0011] The beneficial effects of this utility model are:

[0012] Compared with existing technologies, the locking rod of the detachable composite worm gear with the structure of this utility model can effectively restrict the axial movement of the limiting rod, while the presence of the locking cover can effectively restrict the radial movement of the locking rod. The bidirectional restriction can maximize the stability when the transmission part and the shaft are connected. When disassembly is required, the locking cover can be easily unscrewed from the annular screw joint by rotating it clockwise. Then, by holding the limiting head, the locking rod can be pulled out from the first locking hole and the second locking hole in the radial direction, which can realize the free axial movement of the limiting rod. At this time, the disassembly between the transmission part and the shaft can be easily completed. If only the helical teeth on the transmission part are damaged, only the transmission part needs to be replaced, without replacing the entire worm gear. This effectively avoids the situation where the undamaged shaft part is discarded, and effectively reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the detachable composite worm gear of this utility model;

[0014] Figure 2 yes Figure 1 An enlarged view of part A. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Please see Figure 1 , Figure 2 This utility model provides a detachable composite worm gear, including a shaft portion 1 and a helical tooth 2. The shaft portion 1 has a transmission portion 3 coaxial with it on the left side, and the helical tooth 2 is disposed on the transmission portion 3. The transmission portion 3 has a positioning hole 4 at the center of its right end face. The shaft portion 1 has a positioning portion 5 at the center of its left end face that matches the positioning hole 4. The inner wall of the positioning hole 4 has an inner positioning cone surface 6 that is narrower on the left and wider on the right. The outer wall of the positioning portion 5 has an outer positioning cone surface 7 that fits against the inner positioning cone surface 6. The right end face of the transmission portion 3 fits against the left end face of the shaft portion 1. The outer wall of the right end of the transmission portion 3 has an annular support portion 8. The outer wall of the left end of the shaft portion 1 has a connecting portion 9 that fits against the right side wall of the support portion 8. The connecting portion 9 and the support portion 8 are fixed together by a limiting structure.

[0017] The limiting structure includes several connecting holes 10 evenly arranged in a circle on the connecting part 9; the right side wall of the support part 8 is provided with several limiting rods 11 that match the connecting holes 10; the right end of the limiting rod 11 extends to the outside of the connecting hole 10 and is provided with a first locking hole 12 that penetrates it radially; the outer wall of the left end of the shaft part 1 is provided with several second locking holes 20 that are coaxial with the first locking holes 12; a locking rod 13 passes through the first locking hole 12 and enters into the second locking hole 20, and the inner end face of the locking rod 13 is in contact with the bottom of the second locking hole 20; the outer end of the locking rod 13 is provided with a limiting head 14; the support part 8 is provided with a locking structure that matches the limiting head 14, and the locking structure can restrict the limiting head 14 from moving away from the axis of the shaft part in the radial direction.

[0018] The locking structure includes an annular screw joint 15 extending to the right from the outer edge of the right side wall of the support part 8; a locking cover 16 covering the limiting head 14 is screwed into the annular screw joint 15, and the inner circumferential surface of the locking cover 16 is in contact with the limiting head 14; the locking cover 16 has a shaft hole 17 at its center that matches the shaft part 1.

[0019] The outer edge of the right side wall of the connecting part 9 is provided with several locking notches 18 that match the limiting head 14; the outer end face of the limiting head 14 is coplanar with the outer peripheral surface of the connecting part 9.

[0020] The outer peripheral surface of the support part 8 and the outer wall of the transmission part 3 are connected by a support cone surface 19 that is narrower on the left and wider on the right.

[0021] The method of using this utility model is as follows:

[0022] When the inner positioning cone surface 6 and the outer positioning cone surface 7 are in contact, a 360-degree continuous conical contact surface can be formed. Then, through the radial component force constraint of the continuous conical contact surface, the coaxiality of the transmission part 3 and the shaft part 1 is achieved.

[0023] The presence of the locking rod 13 effectively restricts the axial movement of the limiting rod 11, while the presence of the locking cover 16 effectively restricts the radial movement of the locking rod 13. The bidirectional restriction can maximize the stability when the transmission part 3 is connected to the shaft part 1. When disassembly is required, the locking cover 16 can be easily unscrewed from the annular screw joint 15 by rotating it clockwise. Then, by holding the limiting head 14, the locking rod 13 can be pulled out from the first locking hole 12 and the second locking hole 20 in the radial direction, which can realize the free axial movement of the limiting rod 11. At this time, the disassembly between the transmission part 3 and the shaft part 1 can be easily completed. If only the helical teeth 2 on the transmission part 3 are damaged, only the transmission part 3 needs to be replaced, without replacing the entire worm gear. This effectively avoids the situation where the undamaged shaft part 1 is discarded, and effectively reduces maintenance costs.

[0024] The outer edge of the right side wall of the connecting part 9 is provided with several locking notches 18 that match the limiting head 14. The outer end face of the limiting head 14 is coplanar with the outer peripheral surface of the connecting part 9. When the outer end face of the limiting head 14 is in contact with the inner wall of the locking cover 16, this design can effectively increase the actual contact area of ​​the inner wall of the locking cover 16, further increase the resistance when the locking cover 16 is axially loosened, further ensure the stability of the locking cover 16, and thus further ensure the stability when the shaft part 1 is connected to the transmission part 3.

[0025] The outer peripheral surface of the support part 8 and the outer wall of the transmission part 3 are connected by a support cone surface 19 that is narrower on the left and wider on the right. The presence of the support cone surface 19 can effectively connect the support part 8 and the transmission part 3 together, and they can share the pressure when under pressure, further ensuring the strength of the connection between the transmission part 3 and the shaft part 1.

Claims

1. A detachable composite worm comprising a shaft portion, a helical tooth, characterized in that: The left side of the shaft part has a transmission part coaxial with the shaft part, and helical teeth are arranged on the transmission part; the right end surface of the transmission part is provided with a positioning hole; the left end surface of the shaft part is provided with a positioning part matched with the positioning hole; the inner wall of the positioning hole is provided with an inner positioning conical surface which is narrow on the left and wide on the right; the outer wall of the positioning part is provided with an outer positioning conical surface which is matched with the inner positioning conical surface; the right end surface of the transmission part is matched with the left end surface of the shaft part; the right end outer wall of the transmission part is provided with a support part in the shape of a ring; the left end outer wall of the shaft part is provided with a connecting part matched with the right side wall of the support part; the connecting part and the support part are fixed through a limiting structure.

2. A detachable composite worm in accordance with claim 1, characterized by: The limiting structure comprises a plurality of connecting holes arranged uniformly on the connecting part in a circle; the right side wall of the support part is provided with a plurality of limiting rods matched with the connecting holes; the right end of the limiting rod extends to the outside of the connecting hole and is provided with a first lock hole radially penetrating through the limiting rod; the left end outer wall of the shaft part is provided with a plurality of second lock holes coaxial with the first lock hole; a lock rod penetrates through the first lock hole and penetrates into the second lock hole, and the inner end surface of the lock rod is matched with the bottom of the second lock hole; the outer end of the lock rod is provided with a limiting head; the support part is provided with a clamping structure matched with the limiting head, and the clamping structure can limit the limiting head from moving away from the axis of the shaft part in the radial direction.

3. A detachable composite worm in accordance with claim 2, characterized in that: The clamping structure comprises a ring-shaped screw joint extended out to the right from the outer edge of the right side wall of the support part; the ring-shaped screw joint is screwed with a clamping cover covering the outside of the limiting head, and the inner circumferential surface of the clamping cover is matched with the limiting head; the center of the clamping cover is provided with a shaft hole matched with the shaft part.

4. A detachable composite worm in accordance with claim 3, wherein: The outer edge of the right side wall of the connecting part is provided with a plurality of clamping notches matched with the limiting head; the outer end surface of the limiting head is coplanar with the outer circumferential surface of the connecting part.

5. The detachable composite worm in accordance with claim 1, wherein: The outer circumferential surface of the support part and the outer wall of the transmission part are connected through a support conical surface which is narrow on the left and wide on the right. The connecting part and the support part are fixed through a limiting structure.

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