CN2387318Y

CN2387318Y - Correct timing drive of engine

Info

Publication number: CN2387318Y
Application number: CN 99215770
Authority: CN
Inventors: 刘建芳; 刘晓论
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-08
Filing date: 1999-07-08
Publication date: 2000-07-12
Anticipated expiration: 2009-07-08

Abstract

The utility model relates to a correct timing driving mechanism of an engine and is used on transmission between a crankshaft and a camshaft of an engine. The utility model is composed of a belt wheel 4, a metal belt 2 which is made of spring steel and is provided with an engaging hole 6, and a wheel tooth 5. A plurality of layers of metal thin belts are overlapped, which forms the metal belt 2, or a plurality of metal thin belts are arranged on the belt wheel in parallel. Power is transferred with engaging force and frictional force. During transmission, the wheel tooth 5 and the engaging hole 6 are engaged. The driving mechanism with the structure has the advantages of high transmission intensity, high efficiency, high speed, exact transmission, light weight, stable transmission, less noise, simple structure, low cost, etc.

Description

The engine timing tape handler

The utility model relates to a kind of engine timing tape handler, is used for the transmission between engine crankshaft and the camshaft.In addition, also can be used for being used for the auxiliary system that requirement and engine crankshaft are maintained fixed velocity ratio in addition in the transmission between requirement and engine shaft and the camshaft, as: in the transmission of Injection Pump, switchboard and water pump.

The engine axle transmission has very high synchronous requirement.Accurate for guaranteeing engines distribution and firing time, all adopt gear or timing chain to carry out transmission for a long time, but higher requirement is proposed along with the employing of motor overhead camshaft and to engine weight, noise etc., occur motor in recent years again and be with transmission synchronously, become a kind of principal mode of camshaft of car engine transmission.For example: promptly adopt band transmission synchronously in an existing vapour Audi 100 cars.In these transmissions, gear, chain-driven, weight is big, and noise is big during fair speed; In addition, complicated lubrication system also to be equipped with; Polygon effect during chain-driven is moving more aggravates the vibration of whole system; Gear, chaindriven material and manufacturing expense height, therefore, it is less economical.And what extensively adopt in the motor now is automobile synchronous belt transmission according to ISO ISO/DIS 9010 regulations.Its weight is lighter, and noise is also less during high speed.But because ribbon matrix is made with organic synthesis materials such as neoprenes synchronously, because of its intensity reason, move after the band tooth acts on generation by bending in transmission, slide thereby produce Equivalent Elasticity, this produces adverse influence to transmission degree of accuracy meeting; Neoprene places the high-temperature oil gas and the dust of motor, makes it very easily aging, will reduce its working life like this; The corrosion resistance that resistance to wears of band is relatively poor synchronously, produces a large amount of harmful particles in the transmission; In addition, may cause climbing tooth and slippage phenomenon owing to the intensity reason also can produce creep, these all directly affect the proper functioning of motor; Band is made complexity, material expensive, its manufacture cost height synchronously.

The purpose of this utility model is to provide a kind of intensity height, accurate, the low noise engine timing tape handler of transmission.

The purpose of this utility model is to realize like this, accompanying drawings is as follows: the engine timing tape handler is made up of belt wheel 4, metal tape 2 and the gear teeth 5, it is characterized in that metal tape 2 is to be formed by stacking by the multiple layer metal strip, which is provided with engaging hole 6, this engaging hole 6 is meshed with the gear teeth 5 on the belt wheel 4.

Said metal tape 2 can be arranged in parallel on the belt wheel 4 by many single or multiple lift metal sheet bands.

Pitch is fixed between the said gear teeth 5, and engaging hole 6 is identical with the shape of the gear teeth 5 complete engagement places, and engaging hole 6 is slightly larger than the gear teeth 5.

Adopt above-mentioned driving mechanism to compare with the driving mechanism in existing this field, have the following advantages: metal tape adopts the spring steel manufacturing, because the high elastic modulus of spring steel, make metal tape elongation hardly in transmission, this just makes transmission reach very high transmission Location accuracy, so it has synchronism higher, more accurate transmission.Because the material difference, metal tape has higher intensity than being with synchronously.Creep in the band transmission is the main cause that transmission efficiency reduces, and the creep compliance of metal tape is extremely small, and this has just guaranteed that it has high transmission efficiency.Repeatedly experiment finds that its transmission efficiency is 0.98-0.99.The more important thing is and adopt the multiple layer metal strip that so just greatly reduce the flexural stress that is had material impact its transmission life-span, sandwich tape is superimposed can not to strengthen flexural stress.Draw in the experiment at wheel diameter and single monolayer thick ratio and reach at 650: 1 o'clock, its motion cycle number of times can reach more than 1,000,000 time.In addition, its transmission speed can reach 50m/s.Metal tape is in light weight, and its unit weight calculates with average thickness 0.15mm and is about 0.0134N/mm.m, is the 1/3-1/4 that is with synchronously.Metallic strip structures is simple, and material source is wide, and manufacturing process is simple, and this greatly reduces its cost of production, makes it that better Economy be arranged.

Below in conjunction with the accompanying drawing illustrated embodiment the utility model is described in further detail:

Fig. 1. be a kind of mode of execution of the present utility model (the superimposed transmission of multiple layer metal strip) schematic representation.

Fig. 2. the plan view of Fig. 1.

Fig. 3. be that Fig. 2 takes turns the band amplification cut-away view of band engagement along the A-A line.

Fig. 4. be another kind of mode of execution of the present utility model (many parallel transmissions of individual layer) schematic representation.

Fig. 5. be known existing motor synchronous belt drive mechanism layout plan.

Fig. 6. for known machine machine is with structure synchronously.

Figure 5 shows that the motor synchronous belt drive mechanism layout plan that front background technique part is mentioned, this kind mechanism is the transmission of extensively adopting in the present motor.It is by bent axle timing synchronous pulley 7, and several parts such as jack shaft timing belt pulley 8, timing are with 9 synchronously, Idle wheel 10 and wheel shaft timing belt pulley are formed.Fig. 2 is known synchronous band structure, it is made up of band tooth 12, infantees layer 13, the band back of the body 14 and carrying rope 15, and when transmission, 12 engagements of band tooth are advanced in the engaging groove of wheel, its band tooth 12 and the band back of the body 14 are made by organic synthesis materials such as neoprenes, are subjected to complicated bending and shearing stress.Because band tooth 12 intensity are lower than the intensity of carrying rope 15,, occur that Equivalent Elasticity is slided and the precision that influences its transmission so produce the phenomenon that the band tooth lags behind the carrying rope.The whole piece band is in and makes band tooth 12, infantees layer 13 and 14 accelerated ageings of the band back of the body in the high temperature of motor and the oiliness.In addition, owing to the organic filler that produces of wearing and tearing is dispersed in the air, human body is harmful to, that wears out takes back this height of harvest, and discarded meeting causes the pollution of environment.

Core of the present utility model is that drive belt design is become the multiple layer metal strip of being made by spring steel, and the wheel toothing of belt wheel is improved, thereby, designing requirement of the present utility model.Every layer of tape thickness of this metal sheet band between 0.1mm-0.3mm, the size of concrete optic zone wheel diameter and deciding.Be diverse with synchronous band principle on the engagement process principle, can think that to a certain extent it is " being pressed into banded chain ".Engaging tooth or perhaps mesh bulge are strict on the belt wheel presses fixed knot apart from manufacturing, and produces engaging hole by same pitch on the metal tape.Engaging tooth on the transmission hour wheel and the engaging hole on the metal tape enter engagement, but not the wheel of toothed portion, the band contact fully, the engaging force and the wheel that just exist mate to produce like this in the transmission are with the friction of contact segment generation, and the distribution of the two size can be determined by the tensioning degree of Idle wheel 3.Engaging tooth can be made globulate, involute profile shape etc.The main task of engagement is to be used for transferring power, improves resetting validity etc.

In the utility model, mainly consider, overcome the shortcoming of existing transmission from improving intensity, precision and its usage economy aspect.Fig. 1 is the superimposed transmission schematic representation of multiple layer metal strip, and making on small pulley 4 and the big belt wheel 1 has the gear teeth 5 engaging tooths of identical accurate pitch that multiple profile geometry is arranged, as circle, involute, hyperbola tooth etc.Be with 2 certain thickness (1mm-2mm) is arranged owing to superimposed, therefore metal shape with holes should be shown to reach and meshes effect of sufficient in the transmission process with the complete mate one of flank profil, as the hole shape of Fig. 3 engaging hole 6, adjust the load distribution that Idle wheel 3 can change engaging force and friction.In application, can carry out " correction of the flank shape " and heat treatment to engaging tooth and edge with holes, concentrate to reduce stress, improve intensity, reduce wear, can adopt first running-in, make behind the full contact heat-treating process again, the tooth of this fixed knot distance, hole engagement system, the engagement gear teeth 5 do not move after can not producing under the effect of power.The creep that occurs in the metal tape transmission can not cause the integrating error of whole piece band creep and influences the transmission validity because the positioning action at engagement position is assigned on each pitch its creep, more can not cause climbing tooth and slippage phenomenon because of the elongation of metal tape 2.

The metal tape transmission is the full flexible transmission, and engagement superimposed metal tape 2 and the engagement position of the gear teeth 5 has identical linear velocity when finishing, and the moment that speed can not occur changes and produces impact phenomenon, so stable drive, noise are little.Metal tape is one-sided contact in transmission always, and opposite side is not subjected to engaging force, and like this, the wearing and tearing of the engaging hole 6 and the gear teeth 5 all appear at contacting side.Theoretical pitch is identical with the distance of adjacent contact avris with holes.Pitch can't change because of the wearing and tearing of the band and the gear teeth.On the contrary, can make engagement more abundant after the wearing and tearing.Therefore, wearing and tearing can not cause the life-span to be reduced.

Another embodiment of the present utility model under the situation that structure allows, the mode that can adopt many strip metals strip to be arranged in parallel.Can adopt narrower metal tape.This mode can reduce because the parallelism error of two-wheeled axis causes broad to take rough sledding such as existing sideslip and wearing and tearing out of, also can reduce the additional dynamic load that produces owing to stack.This embodiment's concrete structure is consulted Fig. 4: many gear teeth 5 that are arranged in parallel on the belt wheel 4, the narrow strip 2 ' engagement of every circle gear teeth 5 and a strip metal has at interval between band and the band.More contact points is so just arranged to increase engaging force; Bigger wheel, band area of contact and increase friction are also arranged.This mode can reduce the additional dynamic load that produces owing to multilayer build-up.

The utility model is not limited to the layout of above-mentioned flank profil and band, as long as the transmission in this field is the metal tape transmission of the gear teeth and engagement with holes, all is useful for the utility model.

Claims

1. the engine timing tape handler is made up of belt wheel (4), metal tape (2) and the gear teeth (5), it is characterized in that metal tape (2) is to be formed by stacking by the multiple layer metal strip, which is provided with engaging hole (6), this engaging hole (6) is meshed with the gear teeth (5) on the belt wheel (4).

2. engine timing metal tape driving mechanism according to claim 1 is characterized in that said metal tape (2) can be arranged in parallel on the belt wheel (4) by many single or multiple lift metal sheet bands.

3. engine timing metal tape driving mechanism according to claim 1 and 2 is characterized in that pitch is fixed between the said gear teeth (5), and engaging hole (6) is identical with the shape of the complete engagement place of the gear teeth (5), and engaging hole (6) is slightly larger than the gear teeth (5).