CN205173207U

CN205173207U - Crankshaft structure

Info

Publication number: CN205173207U
Application number: CN201521004302.2U
Authority: CN
Inventors: 赵文兴
Original assignee: Zhejiang Jinlan Auto Part Co Ltd
Current assignee: Zhejiang Jinlan Auto Part Co Ltd
Priority date: 2015-12-07
Filing date: 2015-12-07
Publication date: 2016-04-20
Anticipated expiration: 2025-12-07

Abstract

The utility model discloses a crankshaft structure, the knuckle department that has solved among the prior art between crank and the axle journal produces stress concentration easily, leads to knuckle department bent axle to crack, and the problem of the new bent axle that needs to be changed has improved the repair cost of engine so greatly, and its technical scheme main points are crankshaft structure, including the bent axle body, the bent axle body includes axle journal, crank, the axle journal is provided with the strengthening rib with the articulate junction, the shape of strengthening rib is the wave, has reached and has avoided stress concentration to crack on the junction leads to the bent axle, improves the life of bent axle, reduces the effect that the cracked condition of bent axle appears.

Description

Crankshaft structure

Technical field

The utility model relates to a kind of engine component, and more particularly, it relates to a kind of crankshaft structure.

Background technique

Bent axle is most important parts in motor, all by front end axle, rod journal, crankshaft journal, the part such as crank and rear end axle is formed, bent axle many employings high-quality middle-carbon steel or medium carbon alloy steel die forging form, it can bear the power that connecting rod transmits, and changed into torque and exported by bent axle and drive other operate accessories on motor, bent axle is subject to the centrifugal force of gyrating mass, the gas inertia power of mechanical periodicity and the acting in conjunction of reciprocal inertia force, bent axle is made to bear the effect of flexion torsion load, therefore, bent axle is needed to possess enough strength and stiffness, journal surface needs wear-resisting, work evenly, balance is good, general bent axle all can have and run through main journal, the oil duct of crank and rod journal, so that lubricating spindle neck and rod journal, bent axle in use, the rod journal of bent axle is connected with piston rod, moving up and down of piston rod changes the rotation of main shaft into, bent axle when rotating because be piston brace rod is moved up and down be converted into the rotary motion of main shaft, therefore, under the Action of Gravity Field of connecting rod and crank arm, easily cause the rotational velocity of bent axle not steady, easily to shake, accelerate the damage of bent axle, the dynamic instability of conveying.

In order to solve the problem, be in one section of Chinese patent document of " 201020654958.X " at number of patent application, describe a kind of engine crankshaft, comprise crankshaft front end, output terminal, be arranged at four groups of gear units between crankshaft front end and output terminal and connect the main journal of each group of gear unit, often organize gear unit and comprise two crank arms be connected with both sides main journal respectively and the rod journal be arranged between these two crank arms, crank arm lower end is provided with curved month type equilibrium block, equilibrium block is one-body molded with crank arm or be connected by fixing pin, the crank arm phase place of two middle gear units is identical, crankweb and the middle crankweb phase 180 degree of two gear units of both sides, therefore, when crank rotation, effectively can reduce the concussion of bent axle, ensure that bent axle rotates stably.

But, when this engine crankshaft uses on the engine, during owing to using, the stress of piston rod or other annexes can be concentrated at the knuckle place between crank and axle journal, the easy like this knuckle place bent axle that causes cracks, and at most of conditions, all that the crackle produced and the bent axle fractureed are changed, change new bent axle, substantially increase the repair cost of motor like this, simultaneously, also can be restricted because of the Inventory Performance of spare part bent axle, suitable bent axle may not be had to be used for changing.

Model utility content

For the deficiency that prior art exists, the purpose of this utility model is that providing a kind of strengthens axle journal and crank joint structural strength by stiffening rib, avoid stress concentration at joint to cause bent axle cracks, improve the working life of bent axle, the crankshaft structure that the situation reducing crankshaft breakdown occurs.

For achieving the above object, the utility model provides following technological scheme: a kind of crankshaft structure, comprises crankshaft body, and described crankshaft body comprises axle journal, crank, and the joint of described axle journal and crank is provided with stiffening rib, and the shape of described stiffening rib is waveform.

By adopting technique scheme, one end of stiffening rib is fixedly connected with axle journal, the other end is fixedly connected with crank, is strengthened the structural strength of axle journal and crank joint, avoid stress concentration at joint and cause bent axle cracks by stiffening rib, improve the working life of bent axle, in addition, the shape of stiffening rib is waveform, and corrugated stiffening rib can bear this power pullled, compared with the stiffening rib that other are common, the stiffening rib that the utility model uses is more resistance to be pulled.

Further, described axle journal is provided with buffer layer, described buffer layer is fixedly installed in the outer peripheral wall of axle journal.

By adopting technique scheme, buffer layer is fixedly welded on the cylindrical armshaft of axle journal, and can cushion stress by the toughness of buffer layer, the stress that piston rod is acted on axle journal is not too large, improves the working life of axle journal.

Further, described buffer layer is welded in journal surface by lath martensite material and is formed.

By adopting technique scheme, buffer layer is welded in journal surface by lath martensite material and is formed, lath martensite not only has very high intensity but also has good plasticity and toughness, by the buffer layer that lath martensite welding is formed, the effect of protection axle journal can be played, when piston rod produces stress to axle journal, simultaneously, lath martensite also has low brittle transition temperature, its notch sensitivity and overload sensitive degree all lower, even if buffer layer itself there is crackle time, buffer layer is also very low to the susceptibility of this crackle, crackle does not have the trend of expansion, improve the protection life-span of buffer layer.

Further, described buffer layer is provided with wearing layer.

By adopting technique scheme, be provided with one deck wearing layer on the buffer layer, the coating of this wearing layer on the surface of the buffer layer, makes buffer layer have good wear-resisting effect by this wearing layer, thus make the surface of bent axle have good abrasion resistant effect, with frayed less during plunger rod contacts.

Further, described wearing layer is formed with breeding paint by a kind of permanent mold casting Cr series white cast iron abrading-ball.

By adopting technique scheme, be provided with one deck wearing layer on the buffer layer, wearing layer is formed with breeding paint by a kind of permanent mold casting Cr series white cast iron abrading-ball, this coating can improve the wear resistance of metal, buffer layer is made to have good wear-resisting property, reduce bent axle surface institute frayed, simultaneously, this coating can also improve metal mold material working life, there is again the effect of breeding, be applicable to carry out the process of iron liquid in the processing of lath martensite manufacture of materials, make buffer layer obtain tissue preferably.

Further, the axle center of described axle journal is hollow setting, is provided with reinforcement column piece in the axle center of described axle journal, and described reinforcement column piece is fixedly connected with axle journal.

By adopting technique scheme, the axle center of axle journal is hollow setting, arranges reinforcement cylinder at the hollow parts of axle journal, being fixedly connected with, strengthening the intensity of bent axle, the bulk strength of bent axle is improved by strengthening cylinder with axle journal.

Further, described reinforcement column piece is made up of titanium alloy material.

By adopting technique scheme, titanium alloy has good intensity, the reinforcement cylinder made by titanium alloy material substantially increases the intensity of bent axle, the situation reducing Crank shaft Damage occurs, and meanwhile, titanium alloy material also has good corrosion resistance and heat resistance, in motor high temperature condition under, less on the impact strengthening cylinder, have good stability, this set has the bent axle strengthening cylinder can meet some specific uses.

Accompanying drawing explanation

Fig. 1 is the structural representation of crankshaft structure;

Fig. 2 is the sectional view of crankshaft structure.

In figure: 1, crankshaft body; 2, axle journal; 3, crank; 4, stiffening rib; 5, wearing layer; 6, buffer layer; 7, cylinder is strengthened.

Embodiment

Referring to figs. 1 through Fig. 2, the embodiment of crankshaft structure is described further.

As depicted in figs. 1 and 2, a kind of crankshaft structure, comprise crankshaft body 1, crankshaft body 1 comprises axle journal 2, crank 3, axle journal 2 is provided with stiffening rib 4 with the joint of crank 3, one end of stiffening rib 4 is fixedly connected with axle journal 2, the other end is fixedly connected with crank 3, stiffening rib 4 by strength ratio the higher and good material of Toughness Ratio make, the structural strength of axle journal 2 and crank 3 joint is strengthened by stiffening rib 4, avoid stress concentration at joint to cause bent axle cracks, improve the working life of bent axle, the situation reducing crankshaft breakdown occurs, in addition, the shape of stiffening rib 4 is waveform, axle journal 2 is subject to piston rod when to act on bent axle a downward power, axle journal 2 can be caused to pull the crank 3 on both sides, corrugated stiffening rib 4 can bear this power pullled, compared with the stiffening rib 4 that other are common, the stiffening rib 4 that the utility model uses is more resistance to be pulled, effective protection is to steadiness with the joint of axle journal 2 of crank 3.

As depicted in figs. 1 and 2, axle journal 2 is provided with one deck buffer layer 6, buffer layer 6 is fixedly installed on the cylindrical armshaft of axle journal 2, in the present embodiment, buffer layer 6 is welded on axle journal 2 by lath martensite material and is formed on the surface, lath martensite not only has very high intensity but also has good plasticity and toughness, by the buffer layer 6 that lath martensite welding is formed, the effect of protection axle journal 2 can be played, when piston rod produces stress to axle journal 2, stress can be cushioned by the toughness of buffer layer 6, the stress that piston rod is acted on axle journal 2 is not too large, improve the working life of axle journal 2, simultaneously, lath martensite also has low brittle transition temperature, its notch sensitivity and overload sensitive degree all lower, even if buffer layer 6 itself there is crackle time, buffer layer 6 is also very low to the susceptibility of this crackle, crackle does not have the trend of expansion, improve the protection life-span of buffer layer 6.

As depicted in figs. 1 and 2, buffer layer 6 is provided with one deck wearing layer 5, due to bent axle and plunger rod contacts, in the course of the work, have between bent axle and piston rod and produce friction, long-time use is gone down, the surface of bent axle can be made to be subject to serious wearing and tearing, therefore, buffer layer 6 is provided with one deck wearing layer 5, wearing layer 5 is formed with breeding paint by a kind of permanent mold casting Cr series white cast iron abrading-ball, this coating is open in one section of Chinese patent document of " 201310302038.X " at number of patent application, this coating can improve the wear resistance of metal, buffer layer 6 is made to have good wear-resisting property, reduce bent axle surface institute frayed, simultaneously, this coating can also improve metal mold material working life, there is again the effect of breeding, be applicable to carry out the process of iron liquid in the processing of lath martensite manufacture of materials, buffer layer 6 is made to obtain good tissue.

As depicted in figs. 1 and 2, the axle center of axle journal 2 is hollow setting, in course of working, the axial portions of axle journal 2 is arranged to hollow, be provided with in hollow parts and strengthen cylinder 7, strengthening cylinder 7 is fixedly installed in the hollow parts of axle journal 2, the cast iron materials that all has of general axle journal 2 is made, bent axle should be made to have good intensity and also will have good toughness simultaneously, then, in actual production, the impact being subject to stress concentrated to prevent bent axle causes crankshaft breakdown, general all Choice and process have the bent axle of better toughness, the hardness that this results in bent axle does not catch up with, therefore, arrange at the hollow parts of axle journal 2 and strengthen cylinder 7, be fixedly connected with axle journal 2 by strengthening cylinder 7, strengthen the intensity of bent axle, the bulk strength of bent axle is improved, in the present embodiment, reinforcement cylinder 7 is made up of titanium alloy material, titanium alloy has good intensity, the reinforcement cylinder 7 made by titanium alloy material substantially increases the intensity of bent axle, the situation reducing Crank shaft Damage occurs, simultaneously, titanium alloy material also has good corrosion resistance and heat resistance, in motor high temperature condition under, less on the impact strengthening cylinder 7, there is good stability, this set has the bent axle strengthening cylinder 7 can meet some specific uses.

The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technological schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. a crankshaft structure, comprises crankshaft body, and described crankshaft body comprises axle journal, crank, it is characterized in that: the joint of described axle journal and crank is provided with stiffening rib, and the shape of described stiffening rib is waveform.

2. crankshaft structure according to claim 1, is characterized in that: described axle journal is provided with buffer layer, and described buffer layer is fixedly installed in the outer peripheral wall of axle journal.

3. crankshaft structure according to claim 2, is characterized in that: described buffer layer is welded in journal surface by lath martensite material and is formed.

4. crankshaft structure according to claim 3, is characterized in that: described buffer layer is provided with wearing layer.

5. crankshaft structure according to claim 4, is characterized in that: described wearing layer is formed with breeding paint by a kind of permanent mold casting Cr series white cast iron abrading-ball.

6. crankshaft structure according to claim 5, is characterized in that: the axle center of described axle journal is hollow setting, is provided with reinforcement column piece in the axle center of described axle journal, and described reinforcement column piece is fixedly connected with axle journal.

7. crankshaft structure according to claim 6, is characterized in that: described reinforcement column piece is made up of titanium alloy material.