A transmission toothed chain system

Abstract

A toothed chain transmission system, belonging to the field of chain drive technology, includes a toothed chain and sprockets that mesh with each other. The chain includes guide plates, toothed chain plates, pins, and rollers. Rollers are mounted on the pins. The guide plates are located on both sides of the chain, and the two ends of the pins are respectively interference-fitted with first connecting holes on the guide plates. The toothed chain plates include first toothed chain plates and second toothed chain plates. The first toothed chain plates are arranged side by side along the pin axis on two adjacent pins between adjacent guide plates. The second toothed chain plates are connected to two pins located on the inner side of the first toothed chain plates between adjacent first toothed chain plates. This invention is based on the meshing transmission principle of toothed chains and optimizes and improves the original toothed chain, thereby achieving the goals of noise reduction, load increase, and transmission efficiency improvement when used in conveying equipment, significantly improving the overall performance and reliability of the chain drive system.

Description

Technical Field

[0001] This invention belongs to the field of chain drive technology, and specifically relates to a transmission toothed chain system. Background Technology

[0002] With the continuous commissioning and popularization of intelligent material handling, automated production lines, and automated warehousing plants, traditional manual handling is gradually being replaced by intelligent conveying equipment. In tasks such as transfer, transmission, and handling, chain drive is indispensable for intelligent equipment to transmit power. However, the currently popular traditional roller chains are limited in their wider application under different working conditions due to their disadvantages such as high noise, low load capacity, and low transmission efficiency.

[0003] Comparatively speaking, especially for production sites where quiet operation and precise transmission are highly demanding, developing a chain system that is quiet, reliable, and precise has become an urgent problem for equipment manufacturers. Summary of the Invention

[0004] To address the gaps in existing technologies, this invention discloses a toothed chain transmission system, aiming to solve the problems of high noise, low load capacity, and low transmission efficiency in traditional roller chains. Based on the meshing transmission principle of toothed chains, this invention optimizes and improves upon existing toothed chains, thereby achieving the goals of reduced noise, increased load capacity, and improved transmission efficiency when applied to conveying equipment, significantly enhancing the overall performance and reliability of the chain drive system.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A toothed chain transmission system includes a toothed chain and sprockets that mesh with each other. The chain includes guide plates, toothed chain plates, pins, and rollers. A boss structure is formed in the middle of the pin by diameter expansion. The boss structure is used to mount the rollers, and the rollers are clearance-fitted with the boss structure. The two ends of the boss structure are reserved for axial movement of the rollers. The guide plates are located on both sides of the chain to prevent chain sway during transmission. The guide plates are arranged sequentially along the chain direction. The two ends of the pin are respectively connected to the sequentially arranged guide plates. The first connecting hole is interference-fitted; the toothed chain plate includes a first toothed chain plate and a second toothed chain plate with the same shape and size. Several first toothed chain plates are connected to two adjacent pins between adjacent guide plates and located inside the guide plates. Two adjacent pins pass through two second connecting holes of the first toothed chain plate and are clearance-fitted with the second connecting holes. Two second toothed chain plates are connected to two pins between adjacent first toothed chain plates and located inside the first toothed chain plates. The two third connecting holes of the second toothed chain plate are clearance-fitted with the corresponding pins.

[0007] Preferably, the sprocket end face tooth profile is an involute tooth shape, and the chain and sprocket are connected by an internal and external compound meshing transmission mechanism. When the toothed chain plate contacts the sprocket teeth, the inner convex arc of the toothed chain plate first meshes with the inner teeth. At this stage, the contact between the two is a point contact. As the chain plate further meshes with the teeth, the hinge pairs rotate relative to each other, and the outer straight tooth profile of the toothed chain plate begins to mesh with the outer teeth until the toothed chain plate is completely positioned in the sprocket tooth groove.

[0008] Preferably, the inner width b of the chain inner section, the roller height h′, and the single-sided clearance Δ between the roller and the second toothed chain plate satisfy the formula: b=h′+2Δ.

[0009] Preferably, the inner and outer sides of the tooth base of the toothed chain plate and the guide plate are arc structures, the half angle of the tooth profile formed by the working arc chord when the toothed chain plate and the sprocket mesh is α, and the tooth profile angle is 2α. The degree of the tooth profile angle 2α is 60°, 70° or 80°.

[0010] Preferably, the center height of the hole in the toothed chain plate is set to h, and the center distance between the hole edges is set to f, which should satisfy the formula h = 1.54f.

[0011] Preferably, the center-to-center distance a of the toothed chain plate, the chain pitch P, and the single-sided clearance Δ′ between the toothed chain plate hole diameter and the pin shaft should satisfy the formula: a=p-2Δ′; the center-to-side distance should satisfy the formula: f=0.4P, and the limit deviation is ±0.02mm.

[0012] Preferably, the roller diameter is smaller than the center distance, the roller wall thickness d′ is 0.12-0.14 times the roller outer diameter, and the roller outer diameter should be taken according to the standard value.

[0013] Preferably, the pin is hollow and stepped, and the riveting method is circumferential riveting. Under the premise of ensuring strength, it meets the requirements of lightweighting to the greatest extent and makes the teeth plate holes uniformly stressed when the chain vibrates.

[0014] Preferably, the tooth elongation δ of the toothed chain plate decreases as the number of sprocket teeth increases, and the value δ is 0.08-0.30 mm.

[0015] Preferably, when the chain is running, the support feet of the material pallet are supported on the rollers of the chain. After the material pallet receives external traction force, the rollers drive the chain to run, which in turn drives the sprocket to rotate; or the sprocket rotates, which drives the chain to rotate, which in turn drives the material pallet to move linearly.

[0016] The beneficial effects of the transmission toothed chain system of the present invention are as follows:

[0017] 1. A significant improvement of this invention is the elimination of the traditional roller chain bushing design. In traditional roller chain drives, impact between the rollers and bushings is unavoidable, leading to additional friction and wear on the chain and impact loads on the transmission system. This invention leverages the advantages of toothed chains, with the toothed chain plates directly engaging in meshing. The rollers can drive the material pallet for transport, eliminating the bushing. This design effectively reduces the impact during chain operation, lowers wear on the chain and transmission components, and, moreover, provides higher transmission efficiency and greater load-bearing capacity through the meshing transmission mechanism.

[0018] 2. Traditional roller chains have impact gaps during transmission, which leads to increased transmission errors and decreased transmission accuracy. The chain and sprocket of this invention have an internal and external composite meshing transmission mechanism. This special design makes the chain and sprocket mesh more tightly, reduces the gaps during transmission, improves the accuracy and stability of transmission, and is suitable for some working conditions with high requirements for transmission accuracy.

[0019] 3. This invention offers advantages in extending and improving transmission reliability and service life. Due to the special transmission mechanism employed in the toothed chain, a tight meshing between the chain and sprocket is ensured, thereby reducing gaps and friction during transmission and effectively minimizing the possibility of wear and damage. This makes the toothed chain more reliable in practical use, better able to withstand loads and adapt to different working conditions, and also reduces downtime and maintenance due to transmission failure. Furthermore, the more precise and stable design of the toothed chain reduces transmission errors and energy loss during transmission, which helps extend the service life of the chain and sprocket. In contrast, traditional roller chains may experience accelerated wear on the chain and sprocket due to gaps and impacts, thus shortening the lifespan of the entire transmission system. Therefore, the improved transmission reliability and service life of the toothed chain make it a more reliable and durable transmission component, suitable for engineering applications with high requirements for transmission stability and durability.

[0020] Instruction manual illustrations

[0021] Figure 1 Assembly diagram of the present invention in application.

[0022] Figure 2 Diagram showing the meshing of the chain and sprocket in this invention.

[0023] Figure 3 A partial cross-sectional view of the chain of the present invention.

[0024] Figure 4 1. Front view of the toothed chain plate of the present invention.

[0025] Figure 5 1. Front view of the guide plate of the present invention.

[0026] Figure 6 Assembly diagram of the chain of the present invention.

[0027] Figure 7 1. A perspective view of the pin shaft of the present invention.

[0028] Figure 8 1. A perspective view of the roller of the present invention.

[0029] 1. Chain; 2. Sprocket; 3. Pin; 31. Boss structure; 4. Guide plate; 5. Toothed chain plate; 51. First toothed chain plate; 52. Second toothed chain plate; 6. Roller; 7. Material support plate. Detailed Implementation

[0030] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0031] The following embodiments can be understood as explaining a local structure or individual method of the present invention individually, or as a combination of multiple embodiments to explain a larger scope of the present invention's structure or method.

[0032] Example 1

[0033] A transmission toothed chain system, such as Figure 1-8As shown, the device includes a toothed chain 1 and a sprocket 2 that are meshed together. The chain 1 includes a guide plate 4, a toothed chain plate 5, a pin 3, and rollers 6. The pin 6 has a boss structure 31 formed in the middle by expanding its diameter. The boss structure 31 is used to mount the rollers 6. The rollers 6 are clearance-fitted with the boss structure 31. Both ends of the boss structure 31 are reserved for the axial movement of the rollers 6, that is, the rollers can rotate on the boss structure 31 and can also move relative to the boss structure 31 within a certain distance along the axial direction. The guide plates 4 are located on both sides of the chain 1 to prevent the chain 1 from swaying during transmission. The guide plates 4 are arranged sequentially along the direction of the chain 1. The two ends of the pin 3 are respectively interference-fitted with the first connecting holes of the sequentially arranged guide plates 4. The toothed chain plate 5 includes a shape... The first toothed chain plate 51 and the second toothed chain plate 52 are of the same size. Several first toothed chain plates 51 are connected to two adjacent pins 3 between adjacent guide plates 4 and located inside the guide plates 4. The two adjacent pins 3 pass through two second connecting holes of the first toothed chain plate 51 and are clearance-fitted with the second connecting holes. The second toothed chain plate 52 is connected to two pins 3 between adjacent first toothed chain plates 51 and located inside the first toothed chain plate 51. The two third connecting holes of the second toothed chain plate 52 are clearance-fitted with the corresponding pins 3. The roller 6 is used to connect with the material support plate 7. The distance reserved at both ends of the boss structure 31 is used to allow relative movement between the boss structure and the roller 6 within a certain axial distance range so that the chain 1 can adapt to stress and deformation under different working conditions.

[0034] Example 2

[0035] like Figure 2 , 4 As shown, the sprocket 2 has an involute tooth profile on its end face. The transmission mechanism between the chain 1 and the sprocket 2 is a combined internal and external meshing mechanism. When the toothed chain plate 5 contacts the teeth of the sprocket 2, the inner convex arc of the toothed chain plate 5 first meshes with the teeth. At this stage, the contact between the two is a point contact, resulting in low contact impact noise. As the chain further meshes with the teeth, the hinge pairs rotate relative to each other, and the outer straight tooth profile of the toothed chain plate begins to mesh with the teeth until the toothed chain plate is completely positioned within the sprocket tooth groove. This transmission mechanism is particularly suitable for high-speed, high-load, and reciprocating motion transmissions. It can minimize the polygon effect, effectively mitigate impact and vibration, and greatly reduce the noise level of the transmission system while improving transmission efficiency.

[0036] Example 3

[0037] like Figure 6 , 8As shown, the inner width b of the inner link of chain 1, the roller height h′, and the single-sided clearance Δ between roller 6 and the second toothed chain plate 52 satisfy the formula: b = h′ + 2Δ. This design ensures the normal operation of the chain system while providing the chain with appropriate clearance. Reasonable clearance allows the chain to be more flexible during transmission, reducing impact and vibration transmission. Furthermore, reasonable clearance allows for better penetration and lubrication of the lubricant, reducing wear between the chain and gears and maintaining transmission stability.

[0038] Example 4

[0039] like Figure 4 , 5 As shown, the toothed chain plate 5 and the guide plate 4 have a circular arc structure on the inner and outer sides of the tooth bottom. The tooth profile half angle formed by the working arc chord when the toothed chain plate and the sprocket mesh is α, and the tooth profile angle is 2α. The degree of the tooth profile angle 2α is 60°, 70° or 80°.

[0040] Example 5

[0041] like Figure 3 , 4 As shown, the center height of the hole in the toothed chain plate 5 is set to h, and the center distance between the hole edges is set to f, which should satisfy the formula h = 1.54f. This design can promote the lightweighting of the chain plate while ensuring its strength.

[0042] Example 6

[0043] like Figure 3 , 4 As shown in Figure 6, the center-to-center distance a of the toothed chain plate, the chain pitch P, and the single-sided clearance Δ′ between the toothed chain plate hole diameter and the pin shaft should satisfy the formula: a=p-2Δ′; the center-to-side distance should satisfy the formula: f=0.4P, and the limit deviation is ±0.02mm. This design concept is mainly to meet the actual pitch requirements of the chain.

[0044] Example 7

[0045] like Figure 2 , 3 In sections 6 and 8, the roller diameter is smaller than the center distance to prevent interference between the sprocket and the roller. The roller wall thickness d′ is 0.12-0.14 times the roller outer diameter, and the roller outer diameter should be taken according to the standard value. This is to prevent interference between the sprocket and the roller from affecting the transmission.

[0046] Example 8

[0047] like Figure 7 As shown, the pin 3 has a hollow stepped shape and is riveted by circumferential expansion riveting. Under the premise of ensuring strength, it meets the requirements of lightweighting to the greatest extent and makes the toothed chain plate hole uniformly stressed when the chain vibrates.

[0048] Example 9

[0049] like Figure 3 , 4 As shown, the tooth elongation δ of the toothed chain plate 5 decreases as the number of sprocket teeth increases, with a value of δ = 0.08-0.30 mm. When the δ elongation is too large, the chain cannot achieve internal and external compound meshing with the sprocket; when the δ elongation is too small, the chain's ability to mitigate the polygonal effect weakens. Therefore, setting a reasonable elongation helps to ensure smooth and stable chain-sprocket meshing.

[0050] Example 10

[0051] like Figure 1 As shown, when the chain 1 is running, the support feet of the material pallet 7 are supported on the rollers of the chain. After the material pallet 7 receives external traction force, it drives the chain 1 to run through the rollers, which in turn drives the sprocket 2 to rotate; or the sprocket 2 rotates, drives the chain 1 to rotate, and then drives the material pallet 7 to move linearly.

Claims

1. A transmission toothed chain system, characterized in that: The device includes a toothed chain and sprockets that mesh with each other. The chain includes guide plates, toothed chain plates, pins, and rollers. The pin has a boss structure formed in the middle by expanding its diameter. The boss structure is used to install the rollers. The rollers are clearance-fitted with the boss structure. The two ends of the boss structure are reserved for the axial movement of the rollers. The guide plates are located on both sides of the chain to prevent the chain from swaying during transmission. The guide plates are arranged sequentially along the direction of the chain. The two ends of the pin are respectively connected to the first connecting holes of the sequentially arranged guide plates. Interference fit; the toothed chain plate includes a first toothed chain plate and a second toothed chain plate with the same shape and size. Several first toothed chain plates are connected on two adjacent pins between adjacent guide plates and located inside the guide plates. Two adjacent pins pass through two second connecting holes of the first toothed chain plate and are clearance-fitted with the second connecting holes. Two second toothed chain plates are connected on two pins between adjacent first toothed chain plates and located inside the first toothed chain plates. Two third connecting holes of the second toothed chain plate are clearance-fitted with the corresponding pins. The inner width b of the inner link of the chain, the height h′ of the roller, and the single-sided clearance Δ between the roller and the second toothed chain plate satisfy the formula: b=h′+2Δ; When the chain is running, the support feet of the material pallet are supported on the rollers of the chain. After the material pallet receives external traction force, the rollers drive the chain to run and thus drive the sprocket to rotate; or the sprocket rotates, drives the chain to rotate, and thus drives the material pallet to move linearly.

2. The transmission toothed chain system as described in claim 1, characterized in that: The sprocket end face tooth profile is an involute tooth shape. The chain and sprocket are connected by an internal and external compound meshing transmission mechanism. When the toothed chain plate contacts the sprocket teeth, the inner convex arc of the toothed chain plate first meshes with the inner teeth. At this stage, the contact between the two is a point contact. As the chain plate further meshes with the teeth, the hinge pairs rotate relative to each other. The outer straight tooth profile of the toothed chain plate begins to mesh with the outer teeth until the toothed chain plate is completely positioned in the sprocket tooth groove.

3. The transmission toothed chain system as described in claim 2, characterized in that: The toothed chain plate and the guide plate have a circular arc structure on the inner and outer sides of the tooth base. The tooth profile half angle formed by the working arc chord when the toothed chain plate and the sprocket mesh is α, and the tooth profile angle is 2α. The degree of the tooth profile angle 2α is 60°, 70° or 80°.

4. A transmission toothed chain system as described in claim 2, characterized in that: The center height of the hole in the toothed chain plate is set to h, and the center distance between the hole edges is set to f, which should satisfy the formula h=1.54f.

5. A transmission toothed chain system as described in claim 2, characterized in that: The center-to-center distance a of the toothed chain plate, the chain pitch P, and the single-sided clearance Δ′ between the toothed chain plate hole diameter and the pin shaft should satisfy the formula: a=p-2Δ′; the center-to-side distance should satisfy the formula: f=0.4P, and the limit deviation is ±0.02mm.

6. A transmission toothed chain system as described in claim 5, characterized in that: The roller diameter is smaller than the center distance, the roller wall thickness d′ is 0.12-0.14 times the roller outer diameter, and the roller outer diameter is taken according to the standard value.

7. A transmission toothed chain system as described in claim 2, characterized in that: The pin is hollow and stepped in shape, and the riveting method is circumferential riveting. Under the premise of ensuring strength, it meets the requirements of lightweighting to the greatest extent and makes the teeth plate holes evenly stressed when the chain vibrates.

8. A transmission toothed chain system as described in claim 2, characterized in that: The tooth elongation δ of the toothed chain plate decreases as the number of sprocket teeth increases, and the value δ is 0.08-0.30 mm.

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