CN205559694U - Novel chain link unit of chain drive - Google Patents

Abstract

The utility model discloses a novel chain link unit of a chain transmission, which is composed of a chain plate, a pin shaft, a sleeve and a roller. In terms of assembly, except that only one type of chain plate is required, other parts are basically the same as traditional chain parts. There is an interference fit between the chain plate and the sleeve, and between the chain plate and the pin shaft, and a clearance fit between the roller and the sleeve, and between the sleeve and the pin shaft. When the chain plates flex relative to each other, the sleeve can rotate freely around the pin shaft. When the chain drive is working, the rollers on the sleeve roll along the tooth profile of the sprocket, which can reduce the wear of the chain and sprocket teeth. The wear of the chain mainly occurs on the contact surface between the pin shaft and the sleeve. Therefore, a small gap should be left between the chain plates so that the lubricating oil can penetrate into the friction surface of the pin shaft and the sleeve. The chain link unit completely abandons the deficiency of the original chain link units in pairs, and designs a structure in which all the chain link units are exactly the same. The utility model has strong functionality, convenient installation and simple operation, and can effectively overcome the shortcomings of the existing chain link units.

Description

A new chain link unit for chain drive

technical field

The utility model relates to a novel chain link unit in a vehicle chain transmission, in particular to a novel chain link unit in a vehicle chain transmission.

Background technique

Chain drive is a transmission method that transmits the movement and power of the driving sprocket with special tooth shape to the driven sprocket with special tooth shape through the chain. Chain transmission has many advantages. Compared with belt transmission, there is no elastic sliding and slipping phenomenon, the average transmission ratio is accurate, the work is reliable, and the efficiency is high; the transmission power is large, the overload capacity is strong, and the transmission size is small under the same working conditions; the required tension The tightening force is small, and the pressure acting on the shaft is small; it can work in harsh environments such as high temperature, humidity, dust and pollution.

The number of traditional chain links is preferably an even number, so that when the chain is connected into a ring, the outer chain plate and the inner chain plate are just connected, and the joint can be locked with a spring clip or a cotter pin. If the number of links is odd, transition links are required. When the chain is under tension, the transition link also bears additional bending loads and should generally be avoided.

Moreover, when the number of chain links is an even number, if you want to shorten or extend the center distance of the sprocket due to functional requirements, you must remove or add chain links in pairs. In this way, the center distance may be too long or too short. If the number of chain links can be changed without pairing, it will bring great convenience to production and life and create greater economic benefits.

Utility model content

In order to overcome the fact that the chain links of the traditional chain must be increased or decreased in pairs, and higher installation accuracy is required. The utility model provides a new type of chain link unit for chain transmission. The chain link unit completely abandons the deficiency that the original chain link units are used in pairs, and designs a structure in which all the chain link units are identical. The utility model has strong functionality, convenient installation and simple operation, can effectively overcome the shortcomings of the existing chain link unit, and is very suitable for chain transmission.

The technical solution adopted by the utility model is: the material of the roller chain is 45Mn or 40Cr which is mostly used in the country at present, and all the components of the chain need to be heat treated to improve its strength, wear resistance and impact resistance.

Its structure is composed of chain plate, pin shaft, sleeve and roller. When the chain drive is working, the rollers on the sleeve roll along the tooth profile of the sprocket, which can reduce the wear of the chain and sprocket teeth. In order to form an endless chain in which the links are joined end to end, joints are used to connect them. When the traditional roller chain is connected, when the number of chain links is an even number, the connecting chain link is used, and its shape is the same as that of the chain link. When the number of sections is odd, a transition link must be added. The chain plate of the transition chain link is subject to additional bending moment during work, so it is necessary to avoid using an odd number of chain links as much as possible. And the utility model no matter odd number or even number, all as long as pin shaft and connecting chain plate are fixed with locking pieces such as steel wire lock pin or spring card at joint place.

The appearance of the chain plate 1 is "8", with a small hole on one side and a large hole on the other side; the arcs at both ends are the same size, the arcs at both ends are not in the same plane, and there are concentric circles in the middle of the arc surface Holes, rounding at transitions between arcs. The pin shaft 2 can pass through the round hole of the chain plate 1, and adopts an interference fit; the sleeve 4 is set on the pin shaft 2, and adopts a clearance fit with the pin shaft 2, and the sleeve 4 and the chain plate 1 are interference fit Coordination; the roller 3 and the sleeve 4 adopt clearance fit, and the roller can rotate freely around the sleeve. The appearance of the chain plate 1 is similar to the number "8", and the arcs on both sides have the same size. The chain plates 1 and the chain plates 1 are fitted with each other, connected end to end, and the corners are rounded.

Compared with the prior art, the beneficial effect of the utility model is that the utility model completely abandons the deficiency that the original chain link units are used in pairs, and designs a structure in which all the chain link units are identical. Compared with the existing structure, the utility model is more convenient for assembly and maintenance, and the manufacturing process, technology and process are also simpler, which improves the industrial production efficiency and brings a certain promotion effect to the development of the national economy.

Description of drawings

Fig. 1 is a connection diagram between some chain link units of the present invention.

Figure 2 is the chain plate diagram of a single chain link unit

Fig. 3 is a schematic top view of a section of chain assembled with chain link units.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail:

As shown in accompanying drawing 1, accompanying drawing 2: the utility model is a kind of new chain link unit structure. The chain composed of it includes four parts, namely: chain plate 1, pin shaft 2, roller 3 and sleeve 4.

The working method of the present utility model is as follows: in assembling, only one kind is needed except the chain plate, and other parts are basically the same as the traditional chain parts. There is an interference fit between the chain plate and the sleeve, and between the chain plate and the pin shaft, and a clearance fit between the roller and the sleeve, and between the sleeve and the pin shaft. When the chain plates flex relative to each other, the sleeve can rotate freely around the pin shaft.

When the chain drive is working, the rollers on the sleeve roll along the tooth profile of the sprocket, which can reduce the wear of the chain and sprocket teeth. The wear of the chain mainly occurs on the contact surface between the pin shaft and the sleeve. Therefore, a small gap should be left between the chain plates so that the lubricating oil can penetrate into the friction surface of the pin shaft and the sleeve.

The joint form of this new roller chain: No matter the number of chain links is odd or even, the joints can be fixed by cotter pins or spring cards. Generally, cotter pins are used for large pitches, and spring cards are used for small pitches.

A chain that has more than one single-row chain side by side and connected with a long pin shaft becomes a multi-row chain. The more rows of chains, the higher the carrying capacity, but the manufacturing and installation precision requirements of the chains are also higher, and it is more difficult to make each row of chains evenly stressed, which will greatly reduce the service life of multiple rows of chains, so the number of rows should not exceed 4 rows. When the transmission power is large, two or more double or triple chains can be used.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned method, as long as the method design and technical solutions of the utility model are used to carry out various transformations, or directly Those applied to other occasions are all within the protection scope of the present utility model.

Claims (3)

1. A new chain link unit for chain transmission, including chain plate (1), pin shaft (2), roller (3), sleeve (4), characterized in that: the appearance of the chain plate (1) is "8" shape, one side is a small hole, the other side is a big hole; the arcs at both ends are the same size, the arcs at both ends are not in the same plane, there is a concentric hole in the middle of the arc surface, the arc and the arc Round the transitions between them. 2. The new chain link unit of chain transmission according to claim 1, characterized in that: the pin shaft (2) can pass through the round hole of the chain plate (1), and adopts an interference fit; the sleeve ( 4) Put it on the pin shaft (2), and adopt a clearance fit with the pin shaft (2), and the sleeve (4) and the chain plate (1) are an interference fit; the roller (3) and the sleeve (4) adopt a clearance fit Cooperate, the roller can rotate freely around the sleeve. 3. A new type of chain link unit according to claim 1, characterized in that: the appearance of the chain plate (1) is similar to the number "8", the arcs on both sides are the same size, the chain plate (1) and the chain plate (1) ) are fitted with each other, connected end to end, and the transition corners are rounded.