CN2643079Y

CN2643079Y - Transmission chain tensioner

Info

Publication number: CN2643079Y
Application number: CN 200320106007
Authority: CN
Inventors: 吴德华; 吴群华; 吴伟华; 杨国会; 吴若峰
Original assignee: 吴德华
Priority date: 2003-10-03
Filing date: 2003-10-03
Publication date: 2004-09-22
Anticipated expiration: 2013-10-03

Abstract

The utility model is a transmission chain-tensioning device, which includes a swing arm; one end of the swing is hinged with a bracket through a pin shaft. The other end of the swing arm is free. The pin shaft is provided with a torsion spring; two ends of the torsion spring sustains against the bracket and the swing arm; the pin shaft is provided with a chain wheel; the free end of the swing arm is provided with a chain wheel. The utility model is characterized in large tension amount to the transmission chain, less working friction between the transmission chains, which ensures the transmission chain not to fall off easily and compact in structure. The transmission chain tension device is suitable for using in a chain transmission mechanism of which the distance changing range between the driving chain wheel and the driving chain wheel.

Description

Chain tensioner

Technical field

The utility model relates to the tension device of Transmitted chains, specifically a kind of chain tensioner that is arranged between drive sprocket and driven sprocket.

Background technique

In some chain drives, for preventing the lax of Transmitted chains, the standing chain tensioner that is equipped with.The structure of the chain tensioner of existing routine is, the middle part of one swing arm is hinged on the frame, one end of swing arm be equipped with Idle wheel, the other end and spring against or hang a weight, the principle of its tensioning Transmitted chains is, under the action of gravity of the restoring force of spring or weight, Idle wheel is resisted against on the slack list of Transmitted chains, by Idle wheel with the Transmitted chains tensioning.The deficiency that the chain tensioner of above-mentioned routine exists is: the amount of tension to Transmitted chains is less, and when because of need of work, the distance between drive sprocket and driven sprocket shortens more for a long time, can't be with the Transmitted chains tensioning; Idle wheel is a roller, and the friction between it and Transmitted chains is bigger.For example, some farm implements pass through the Transmitted chains transmission in farm work by tractor-drawn and by tractor, when advancing to headland turn, must farm implements be lifted by the hydraulic mechanism of tractor, at this moment, distance between drive sprocket and driven sprocket will shorten more, just can't be with the Transmitted chains tensioning by above-mentioned existing chain tensioner.

Summary of the invention

The purpose of this utility model is to provide the little chain tensioner of friction between the big and Transmitted chains of a kind of amount of tension to Transmitted chains.

For achieving the above object, the utility model adopts following scheme: chain tensioner, include a swing arm, one end of swing arm is hinged by an end of a bearing pin and a support, the other end freedom of swing arm is equipped with torsion spring on the bearing pin, two ends of torsion spring are resisted against in support and the swing arm, one sprocket wheel is housed on the bearing pin, and the free end of swing arm is equipped with a sprocket wheel.This chain tensioner is fixed on the power equipment and is between the drive sprocket and the driven sprocket on the non-power equipment on the power equipment, be contained on the sprocket wheel of Transmitted chains in bearing pin and the swing arm on drive sprocket and the driven sprocket and with they engagements.

The hunting range of swing arm is big in this chain tensioner, and adopts the free-ended sprocket wheel of swing arm to come the tensioning Transmitted chains, has changed existing mode by roller tensioning Transmitted chains.Therefore, this chain tensioner is big to the amount of tension of Transmitted chains, and the friction of the work between Transmitted chains is little, and it also has compact structure, guarantees the characteristics of Transmitted chains difficult drop-off.This chain tensioner is particularly useful in the big chain drive of variable in distance scope between drive sprocket and driven sprocket.

Description of drawings

Fig. 1 the utility model one embodiment's structural drawing;

The A-A sectional view of Fig. 2 Fig. 1;

The plan view of scaffold among Fig. 3 Fig. 1;

The plan view of Fig. 4 Fig. 3;

The left view of Fig. 5 Fig. 3.

Further specify the utility model below in conjunction with embodiment and accompanying drawing.

Embodiment

Referring to Fig. 1, an end of swing arm 8 is hinged by an end of a bearing pin 5 and a support 3, the other end freedom of swing arm 8, torsion spring 7 is housed on the bearing pin 5, two ends of torsion spring 7 are resisted against in support 3 and the swing arm 8, and a sprocket wheel 6 is housed on the bearing pin 5, and the free end of swing arm 8 is equipped with a sprocket wheel 9.For the Transmitted chains of further guaranteeing to be on this chain tensioner can not come off, at the middle part of support 3 roller 4 is housed, the other end of support 3 also is equipped with sprocket wheel 2.Can be when like this, Transmitted chains is in than relaxed state by roller 4 spacing and sprocket wheel 2 supports.In addition,, on support 3, be connected with a scaffold 1,, this chain tensioner can be fixed on the power equipment by scaffold 1 is connected on the power equipment for this chain tensioner is installed.

Fig. 1 has also illustrated the mounting type of drive sprocket, the relation of the position between the driven sprocket on the non-power equipment and Transmitted chains on this chain tensioner and the power equipment.As seen from Figure 1, when this chain tensioner is provided with, between the driven sprocket 22 on drive sprocket on the power equipment 20 and the non-power equipment, the Transmitted chains 21 that is contained on drive sprocket 20 and the driven sprocket 22 meshes on sprocket wheel 6,9 and with them, the sprocket wheel 2 of support 3 lower ends also meshes with Transmitted chains 21, and the moment of torsion of 7 pairs of swing arms 8 of torsion spring is counterclockwise.When the distance of 22 of drive sprocket 20 and driven sprockets shortened gradually, under the effect of torsion spring 7, swing arm 8 also rotated counterclockwise thereupon, thereby makes Transmitted chains 21 be in tensioning state all the time by sprocket wheel 9; When under external force, when the distance that drive sprocket 20 and driven sprocket are 22 increased gradually, external force overcame the torsion of torsion spring 7, and swing arm 8 also clockwise rotates thereupon.

Referring to Fig. 2, be positioned at swing arm 8 free-ended sprocket wheels 9 and be contained on the bearing pin 11 by bearing 10, bearing pin 11 is contained in the swing arm 8.One end of swing arm 8 is hinged with an end of support 3 by bearing pin 5, and the sprocket wheel 6 on the bearing pin 5 is positioned at bearing pin 5 middle parts, and sprocket wheel 6 is contained on the bearing pin 5 by bearing 13.Two sides of swing arm 8 and support 3 are installed with

bolt

12,14 respectively, and bearing pin 5 is resisted against on the

bolt

12,14 near two ends that 7, two torsion springs 7 of a torsion spring respectively are housed on the shaft part of two ends.The roller 4 that is positioned at support 3 middle parts is contained on the bearing pin 16 by bearing 15, and bearing pin 16 is contained on the support 3.The sprocket wheel 2 that is positioned at support 3 the other ends is contained on the bearing pin 17 by bearing 18, and bearing pin 17 is contained on the support 3.

The concrete structure of scaffold 1 such as Fig. 3, Fig. 4, shown in Figure 5.As seen from Figure 3, on scaffold 1, have two slots 19, pass two slots 19 by bolt scaffold 1 is connected on the power equipment.By Fig. 1, Fig. 2 as seen, scaffold 1 is welded on support 3 outsides.

For some by tractor with small four wheels traction and by tractor by the Transmitted chains transmission can operation farm implements, can this chain tensioner be set by mode shown in Figure 1 in the chain drive between farm implements and tractor.For example, harvester for peanut or rotary cultivator are drawn by tractor with small four wheels, and when the Transmitted chains transmission, the set-up mode of this chain tensioner is: scaffold 1 is connected on the trailing wheel and the fixed beam between headstock of tractor with small four wheels by bolt, this chain tensioner is fixed on the tractor, piece number 20 among Fig. 1, represent the driven sprocket on the drive sprocket on the tractor and harvester for peanut or the rotary cultivator respectively for 22, this chain tensioner is between drive sprocket 20 and movable sprocket 22, be contained in Transmitted chains 21 on drive sprocket 20 and the driven sprocket 22 around sprocket wheel 6, mesh on 9 and with them, the sprocket wheel 2 of support 3 lower ends also meshes with Transmitted chains 21.When tractor-drawn harvester for peanut or rotary cultivator advance to the edge of a field must turn the time in farm work, the hydraulic mechanism of tractor lifts harvester for peanut or rotary cultivator, in the process that be lifted at harvester for peanut or rotary cultivator, the distance of 22 of drive sprocket 20 and driven sprockets shortens gradually, under the effect of torsion spring 7, swing arm 8 also rotates counterclockwise thereupon, thereby makes Transmitted chains 21 be in tensioning state all the time.When the hydraulic mechanism of tractor put down harvester for peanut or rotary cultivator, the gravity of harvester for peanut or rotary cultivator overcame the torsion of torsion spring 7, and swing arm 8 is clockwise rotated thereupon, and the distance that drive sprocket 20 and driven sprocket are 22 increases gradually.

Claims

1, chain tensioner, include a swing arm (8), it is characterized in that: an end of swing arm (8) is hinged with an end of a support (3) by bearing pin (5), the other end freedom of swing arm (8), torsion spring (7) is housed on the bearing pin (5), two ends of torsion spring (7) are resisted against in support (3) and the swing arm (8), and a sprocket wheel (6) is housed on the bearing pin (5), and the free end of swing arm (8) is equipped with a sprocket wheel (9).

2, chain tensioner according to claim 1, it is characterized in that: bearing pin (5) respectively is equipped with a torsion spring (7) near on the shaft part of two ends, two sides of swing arm (8) and support (3) are installed with bolt (12,14) respectively, and two ends of two torsion springs (7) on the bearing pin (5) are resisted against on the bolt (12,14).

3, chain tensioner according to claim 1 is characterized in that: roller (4) is equipped with at the middle part of support (3), and the other end of support (3) also is equipped with a sprocket wheel (2), also is connected with a scaffold (1) on the support (3).