CN100533050C

CN100533050C - Length measuring method and device for timing chain

Info

Publication number: CN100533050C
Application number: CNB2007101334512A
Authority: CN
Inventors: 侯建国; 汪政
Original assignee: NANJING LIMIN MACHINERY CO Ltd
Current assignee: NANJING LIMIN MACHINERY CO Ltd
Priority date: 2007-09-30
Filing date: 2007-09-30
Publication date: 2009-08-26
Anticipated expiration: 2027-09-30
Also published as: CN101173848A

Abstract

The invention provides a method and relevant device for simply and accurately determining whether the timing chain in a motorcycle engine is overlong, the method is as follow: arranging both ends of the chain on a round wheel and an eccentric wheel which can be rotated around an eccentric center, rotating the eccentric wheel to tighten the chain, then determining the chain length according to the angle of the line between the eccentric center and the center relative to the reference line; the reference line is that the line from the eccentric center to the center when tightening the chain with minimal theoretical size which is arranged on the round wheel and the eccentric wheel.

Description

Timing chain is surveyed rectangular method and device

Technical field

The present invention relates to the length measuring method and the measuring motion of timing chain in the motorcycle engine.。

Background technology

Survey in the length at present timing chain, normally adopt the way of launching measurement in process of production, this method is simple, easy operating concerning the manufacturer, and can know the concrete length of every chain, by the analysis to length data, the manufacturer can more effectively control the length of chain.But for the timing chain in the motorcycle engine of packing into, after running-in after a while, whether length how to judge chain fast overlength? if launch to measure as the manufacturer, for the personnel in maintenance market, two difficulties arranged.

One, need special-purpose instrument, some part of this instrument is a consumable accessory, can increase the cost of maintenance;

Two, the part of pulling down after expansion damages, and connect chain ring needs new part, and this also makes cost increase.

In this case, whether qualified we developed a kind of specially at the instrument of timing chain length in the quick judgement engine in motorcycle maintenance market.

Summary of the invention

The invention provides the length whether method and the corresponding device thereof of overlength of simply, accurately judging timing chain in the motorcycle engine, it not only can be used for motorcycle maintenance market, and also year is used for chain production firm.

This timing chain measuring motion comprises the circle wheel of stationkeeping can being arranged on the pointer on the eccentric wheel around the eccentric wheel of off-centered eccentric rotary, and being distributed in off-centre is scale mark on the circumference in the center of circle; Pointer is positioned on the line at eccentric and center; With theoretical size on minimum chain is sleeved on above-mentioned circle wheel and the eccentric wheel during tensioner of back the line eccentric and center be the datum line of scale mark.

This timing chain is surveyed rectangular method, is the chain two ends are sleeved on the circle wheel and can rotate eccentric wheel tensioner chain on the eccentric wheel of off-centered eccentric rotary, judges chain length with eccentric line with the center with respect to the angle of datum line; Described datum line is: with theoretical size on minimum chain is sleeved on above-mentioned circle wheel and the eccentric wheel during tensioner of back, the line at eccentric and center.

This measurement mechanism is simple in structure, and practicality is easy to processing, and is with low cost, the use in very suitable maintenance market (production firm also can use).

Description of drawings

Fig. 1 is a measuring motion front view of the present invention.

Fig. 2 is a measuring motion vertical view of the present invention.

Fig. 3 is the synoptic diagram of measuring motion of the present invention when the mensuration theoretical size is the chain of minimum.

Fig. 4 is the synoptic diagram of measuring motion of the present invention when the mensuration theoretical size is the chain of maximum.

Fig. 5 is the partial enlarged drawing among Fig. 4.

Embodiment

According to the regulation of GB GB/T1243-2006, the length tolerance of motorcycle timing chain is

This measuring instrument is measured timing chain in the 84 joint motorcycle engines, and chain pitch 6.35 is so the national standard length range of chain is 533.4mm-534.2mm.Because chain is after the motorcycle engine of packing into, through running-in, chain will extend, but still in the scope of using.This elongation is the elongation that the manufacturer reserves in process of production, and the concrete numerical value of this elongation is 0.4% of the chain length upper limit.Promptly the length overall of 84 pitch chain bars is not more than 536.38mm and all can uses.When judging the length range of chain, increase progressively 0.1% to be limited to benchmark on the chain length overall at every turn, be incremented to 0.4%, be six grades so be divided into when judging the scope of chain length always, is respectively 533.4mm, 534.2mm, 534.73mm, 535.27mm, 535.80mm, 536.38mm.

Shown in Fig. 1-5, circle wheel 2 is arranged on the base 8 by axle 3 and corresponding nut, and axle 3 is by the centers of circle of circle wheel 2, and circle wheel 2 can rotate around axle 3.The center of eccentric wheel 4 (how much centers of circle) is A (or B), and its off-centre is C.Eccentric wheel 4 is arranged on the base 8 by axle 5 and corresponding nut, and axle 5 is by eccentric C, and eccentric wheel 4 can rotate (swing) around axle 5.Handle 11 is connected on the eccentric wheel 4.

Pointer 9 is set on the eccentric wheel circumference, and it is on the circumference in the center of circle that the scale mark on the index dial 10 is distributed in eccentric C.Pointer is positioned at theoretical size on minimum chain is sleeved on above-mentioned circle wheel and the eccentric wheel during tensioner of back on the line at eccentric and center.Scale mark on the index dial 10 is corresponding chain length 533.4mm, 534.2mm, 534.73mm, 535.27mm, 535.80mm, 536.38mm respectively.Scale mark 1 corresponding minimum chain length 533.4mm wherein.

In measuring motion, some size is (design) given in advance, and some size is that the chain according to different length calculates.

Circle wheel and eccentric wheel diameter 60mm, eccentric eccentric throw (the center A of eccentric wheel 4 is to the distance of eccentric C) 12mm are given in advance.

Centre distance L among Fig. 3 will determine by the minimum length of calculating 84 pitch chain bars, the length minimum value of 84 pitch chain bars is 533.4mm, chain is after wrapping circle wheel and eccentric wheel, the length of chain is added by the length on two limits and wraps in the circle wheel and eccentric two semicircles are formed, the diameter of semicircle is the diameter of the center line of chain, be 60mm among the figure, be (533.4-3.14 * 60)/2=172.5mm by calculating the length that can obtain L.This moment, the line of C and A was vertical with eccentric line of centres H with the circle wheel, so just guarantee that scale mark (datum line) 1 is on the position perpendicular with justifying the wheel and the eccentric line of centres, pointer 9 alignment fiducials lines 1 are so that the processing of the scale mark on the index dial and index dial are installed.

With Fig. 4,5 is example, and the method for length (because the scale mark between the

scale mark

1 and 6 is too little at interval, be not easy to explanation, so be example illustrate with scale mark 6) is determined and measured in the position that specifies scale mark.After chain installs, with eccentric C is the center of circle, rotate eccentric wheel, the change in location of center A is to Fig. 4 centre to centre heart B among Fig. 3, the distance L at circle wheel and eccentric wheel center just is changed to the L1 among Fig. 4 among this moment Fig. 3, L1 is greater than L (also introduced in front the chain length of scale mark 6 should corresponding chain length be 536.38mm) obviously, just to determine eccentric C, the line of center A and scale mark 1 (eccentric C, center A and scale mark 1 are in a straight line) with eccentric C, the line of center B and scale mark 6 (eccentric C, center B and scale mark 6 are in a straight line) between angle, just can on index dial, determine the position of scale mark 6.

As can be seen from Figure 5, when the chain length that requires scale mark 6 correspondences was 536.38mm, the length that calculates L1 by given data was 173.99mm, and the center of circle with circle wheel is the center of circle so, was that radius is done circular arc 12 with the length of L1; Be the center of circle again with C, the length 12mm of eccentric throw be radius do the circle 13. liang of circles intersect at the B point, that is to say, when the A among Fig. 3 changes to B position among Fig. 4, the length of chain is respectively 533.4mm and 536.38mm, the line of CB extends on the index dial always so, and corresponding point are exactly the position of scale 6, so just the position of scale 6 have been decided.By mapping, can make things convenient for, obtain the size of angle D efficiently, concrete numerical value is 23.9 degree.In like manner, can determine that again chain length is the particular location of the

pairing scale mark

2,3,4,5 of 534.2mm, 534.73mm, 535.27mm, 535.80mm with identical method.

Conclusion is got up, determine the position of each scale mark when this measuring method is main by calculating, also just found the position of the chain correspondence of different length, so again in Wei Xiu the process, as long as chain is installed, see the position of pointer indication scale mark, whether the length that we just can judge measured chain accurately overlength.Whether the length that the present invention can judge timing chain in the motorcycle engine fast and accurately is qualified, thereby the fault that whether causes because of the length overlength of timing chain in the engine in the motorcycle maintenance process is made right judgement.

Claims

1. timing chain is surveyed rectangular method, it is characterized in that: the chain two ends are sleeved on the circle wheel and can rotate eccentric wheel tensioner chain on the eccentric wheel of off-centered eccentric rotary, judge chain length with eccentric line with the center with respect to the angle of datum line;

Described datum line is: with theoretical size on minimum chain is sleeved on above-mentioned circle wheel and the eccentric wheel during tensioner of back, the line at eccentric and center.

2. timing chain measuring motion is characterized in that: the circle wheel that it comprises stationkeeping, can be arranged on the pointer on the eccentric wheel around the eccentric wheel of off-centered eccentric rotary, and being distributed in off-centre is scale mark on the circumference in the center of circle; Pointer is positioned on the line at eccentric and center; With theoretical size on minimum chain is sleeved on above-mentioned circle wheel and the eccentric wheel during tensioner of back the line eccentric and center be the datum line of scale mark.

3. measuring motion according to claim 2 is characterized in that: the circle wheel is identical with the eccentric wheel diameter.

4. measuring motion according to claim 3 is characterized in that: the circle wheel is 50-70mm with eccentric centre distance, and eccentric eccentric throw is 10-15mm.