CN111561511A - Assembled bent axle - Google Patents
Assembled bent axle Download PDFInfo
- Publication number
- CN111561511A CN111561511A CN202010399592.4A CN202010399592A CN111561511A CN 111561511 A CN111561511 A CN 111561511A CN 202010399592 A CN202010399592 A CN 202010399592A CN 111561511 A CN111561511 A CN 111561511A
- Authority
- CN
- China
- Prior art keywords
- crankshaft
- journal
- crank
- balance
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/06—Crankshafts
- F16C3/10—Crankshafts assembled of several parts, e.g. by welding by crimping
- F16C3/12—Crankshafts assembled of several parts, e.g. by welding by crimping releasably connected
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/20—Shape of crankshafts or eccentric-shafts having regard to balancing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
- F16F15/283—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same for engine crankshafts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention provides an assembled crankshaft, comprising: the main shaft neck and the connecting neck are parallel to each other in axis; the crank is positioned between the main journal and the connecting journal, one end of the crank is connected to the main journal, and the other end of the crank is connected to the connecting journal; and a counterbalance for balancing the centrifugal moment of the fabricated crankshaft; the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body, and the balance weight is installed on the crankshaft main body. The assembled crankshaft improves the material utilization rate and reduces the manufacturing defects; the balance weight of the crankshaft is made of independent parts through machining, and machining difficulty of the balance weight can be reduced. Meanwhile, the assembled balance block can accurately realize the required dynamic balance weight and realize a dynamic balance range with a larger angle along the rotation contour.
Description
Technical Field
The invention belongs to the field of internal combustion engine systems, and particularly relates to a crankshaft adopting an assembled balance block.
Background
In order to meet the increasingly stringent requirements of emission and fuel consumption regulations, one of the trends in modern internal combustion engines is to reduce the weight of the internal combustion engine while ensuring high power and high torque output. Furthermore, vibration noise performance is one of the most interesting qualities for customers, and how to ensure vibration noise performance at high power and high torque is also one of the challenges of modern internal combustion engines. The crankshaft is used as the most main moving part of the internal combustion engine, the friction loss of the internal combustion engine can be effectively reduced by reducing the weight of the crankshaft, the dynamic balance performance is good, the vibration excitation can be reduced, and the vibration noise performance is effectively ensured.
At present, the widely used integral crankshaft comprises a shaft neck, a crank and a balance block, and forging and casting are mostly adopted. In order to reduce the weight, the weight reduction is usually realized by reducing the weight. But because of the existence of the balance block, the mold structure used for manufacturing the blank is complex, the material utilization rate is low and the manufacturing defect is high. In order to realize good dynamic balance performance, the peripheral dimension of the balance block needs to be machined in the machining process except for gradually reducing the manufacturing tolerance of the blank, and finally, a special dynamic balancing machine needs to be used for crankshaft dynamic balance calculation and punching is carried out on the balance block. Each batch also requires special pilot machining to confirm its dynamic balance, subject to fluctuations in the manufacturing tolerances of the blank. In order to ensure good dynamic balance performance and reduce waste of dynamic balance materials as much as possible, when the integral crankshaft is designed, a great deal of time is also needed for dynamic balance calculation, and unbalance is concentrated in a specific balance weight and a corresponding angle range.
Disclosure of Invention
In view of this, the invention provides an assembled crankshaft to solve the technical problems of high processing cost and difficulty in ensuring balance of the existing integral crankshaft.
The invention adopts the following technical scheme for solving the technical problems:
a fabricated crankshaft, comprising: the main shaft neck and the connecting neck are parallel to each other in axis; the crank is positioned between the main journal and the connecting journal, one end of the crank is connected to the main journal, and the other end of the crank is connected to the connecting journal; and a counterbalance for balancing the centrifugal moment of the fabricated crankshaft; the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body, and the balance weight is installed on the crankshaft main body.
In some embodiments of the present invention, the balance weight is connected to the crankshaft main body in an interference manner.
In some embodiments of the present invention, a through hole is formed in the main journal along the axial direction, and the balance weight is inserted into the through hole.
In some embodiments of the present invention, the weight comprises: the mounting part is inserted into the through hole of the main journal; a balance part having a set distance from an axis of the main journal; and a connecting portion connected between the mounting portion and the balance portion.
In some embodiments of the present invention, the mounting portion is cylindrical, and the through hole of the main journal, which is in a position matching with the mounting portion, corresponds to a circular hole.
In some embodiments of the present invention, the balance portion is an arc-shaped strip, and the connecting portion is a sector.
In some embodiments of the invention, the counterbalance is detachably coupled to the crankshaft body.
In some embodiments of the invention, the counterweight is bolted to the crank.
In some embodiments of the present invention, the balance weight is connected to the main journal by a bolt.
Compared with the prior art, the invention has the following technical effects:
according to the assembled crankshaft provided by the invention, the crankshaft main body is integrally formed by the main journal, the connecting journal and the crank, and the main bearing part is integrally cast and formed, so that the bearing strength of the crankshaft can be ensured; in the blank stage, the complexity of a die used for casting or forging can be reduced, the material utilization rate is improved, and the manufacturing defects are reduced; the balancing piece of the crankshaft is made of independent parts through machining, a dynamic balance hole does not need to be punched, and the machining difficulty of the balancing piece can be reduced. Meanwhile, the assembled balance block can accurately realize the required dynamic balance weight and realize a dynamic balance range with a larger angle along the rotation contour.
Drawings
FIG. 1 is a front view of one embodiment of a fabricated crankshaft provided in accordance with the present invention;
FIG. 2 is a side view of one embodiment of a fabricated crankshaft provided in accordance with the present invention;
FIG. 3 is a cross-sectional view of one embodiment of a fabricated crankshaft provided in accordance with the present invention.
Detailed Description
The present invention will be described in detail with reference to examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Fig. 1-3 show a specific embodiment of a fabricated crankshaft according to the present invention. The present embodiment will be described by taking a crankshaft applied to an inline 2-cylinder machine as an example. The crankshaft comprises a crankshaft body 10 which is integrally cast or forged and a balance weight 20 which is independently manufactured, wherein the balance weight 20 is installed on the crankshaft body 10 to form a final assembled crankshaft.
The crankshaft body 10 is formed of three functional structures, namely a main journal 11, a crank 13 and a connecting journal 12.
The main journal 11 is a support portion of the crankshaft, and is supported in a main shaft support base of the crankcase through the main journal 11.
The connecting neck 12 is a connecting part of a crankshaft and a connecting rod, and the axes of the main journal 11 and the connecting neck 12 are parallel to each other.
The crank 13 is positioned between the main journal 11 and the connecting journal 12, and the section of the crank 13 is oval; one end of the crank 13 is connected to the main journal 11, and the other end is connected to the connecting journal 12. The joints between the crank 13 and the main journal 11 and between the crank 13 and the connecting journal 12 are in arc transition to reduce stress concentration.
Main bearing parts of the crankshaft: the main crankshaft body 10 formed by the main journal 11, the connecting journal 12 and the crank 13 is integrally cast, so that the bearing strength of the crankshaft can be ensured; in the blank stage, the complexity of a die used for casting or forging can be reduced, the material utilization rate is improved, and the manufacturing defects are reduced.
In order to balance the inertia force, the crankshaft further includes a balance weight 20, the balance weight 20 is used for balancing the unbalanced centrifugal moment of the engine and sometimes also used for balancing a part of the reciprocating inertia force, so as to make the crankshaft rotate smoothly, and the balance weight 20 is mounted on the crankshaft body 10 by interference connection or threaded connection or even welding.
Because the balance weight 20 of the crankshaft is made of independent parts through machining, a dynamic balance hole does not need to be punched, and the machining difficulty of the balance weight 20 can be reduced. Meanwhile, the assembled balance weight 20 can accurately realize the required dynamic balance weight and realize a dynamic balance range with a larger angle along the rotation contour.
The manner in which the balancer 20 is mounted to the crankshaft main body 10 is not exclusive; in one embodiment, as shown in fig. 2 and 3, the balance weight 20 is interference-connected to the crankshaft main body 10.
Specifically, a through hole is formed in the main journal 11 along the axial direction, and the balance weight 20 is inserted into the through hole and is in interference fit to achieve mutual connection.
More specifically, the balance weight 20 includes a mounting portion 21 inserted into the through hole of the main journal 11, a balance portion 23 for performing a balance function, and a set distance is provided between the balance portion 23 and the axis of the main journal 11; and a connecting portion 22 connected between the mounting portion 21 and the balance portion 23.
More specifically, in order to achieve better balance, the balance part 23 is in an arc-shaped strip shape, and the connecting part 22 is in an approximate fan-shaped structure; in order to adjust the radial installation position of the balance weight 20 on the crankshaft, the installation portion 21 of the balance weight 20 is cylindrical, and a through hole of the main journal 11, which is matched with the installation portion 21, is a circular hole. Therefore, when the balance weight 20 is installed, the position of the balance weight 20 can be adjusted in the circular hole in a rotating mode, and interference connection is carried out after the adjustment is finished. .
In another embodiment of the present invention, the balance weight 20 is detachably coupled to the crankshaft body 10. (not shown in this part of the figure)
The manner in which the counterweight 20 is removably attached to the crankshaft body 10 is not exclusive. Specifically, the balance weight 20 may be bolted to the crank 13 or the main journal 11.
More specifically, the main journal 11 is followed the axial direction and is gone up the shaping and is had the through-hole, the through-hole is connecting the part of balancing piece 20 sets up to the screw hole, the shaping is equipped with the connecting hole on the installation department of balancing piece 20, balancing piece 20 is through wearing to establish the bolt of connecting hole and screw hole realizes dismantling of both and is connected.
More specifically, a through hole is formed in the main journal 11 along the axial direction, the mounting portion of the balance weight 20 is inserted into the through hole, and a connecting hole is formed in the crank 13 along the axial direction perpendicular to the main journal 11; the balance weight 20 is provided with a threaded hole, and the balance weight 20 is detachably connected with the connecting hole of the crank 13 and the threaded hole of the balance weight 20 in a penetrating mode.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A fabricated crankshaft, comprising:
the main shaft neck and the connecting neck are parallel to each other in axis;
the crank is positioned between the main journal and the connecting journal, one end of the crank is connected to the main journal, and the other end of the crank is connected to the connecting journal;
and a counterbalance for balancing the centrifugal moment of the fabricated crankshaft; the method is characterized in that: the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body, and the balance weight is installed on the crankshaft main body.
2. A fabricated crankshaft according to claim 1, wherein:
the balance weight is connected to the crankshaft main body in an interference mode.
3. A fabricated crankshaft according to claim 2, wherein:
the main journal is internally provided with a through hole along the axis direction, and the balance block is inserted in the through hole.
4. A fabricated crankshaft according to claim 3, wherein:
the weight includes:
the mounting part is inserted into the through hole of the main journal;
a balance part having a set distance from an axis of the main journal;
and a connecting portion connected between the mounting portion and the balance portion.
5. The fabricated crankshaft of claim 4, wherein:
the installation department is cylindrical, the main journal with the through-hole of installation department cooperation position corresponds to the circular port.
6. The fabricated crankshaft of claim 4, wherein:
the balance part is arc-shaped strip, and the connecting part is fan-shaped.
7. A fabricated crankshaft according to claim 1, wherein:
the counterbalance is detachably connected to the crankshaft main body.
8. A fabricated crankshaft according to claim 7, wherein:
the balance weight is connected to the crank through a bolt.
9. A fabricated crankshaft according to claim 7, wherein:
the balance weight is connected to the main journal through a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399592.4A CN111561511A (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399592.4A CN111561511A (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111561511A true CN111561511A (en) | 2020-08-21 |
Family
ID=72071995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010399592.4A Pending CN111561511A (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111561511A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352681A (en) * | 2021-12-29 | 2022-04-15 | 中国石油天然气集团有限公司 | Dynamic adjustment type crankshaft balance block structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB124883A (en) * | 1918-04-03 | 1919-04-03 | William Douglas | Improvements in or relating to Crank-shafts for Engines. |
| GB176583A (en) * | 1921-01-13 | 1922-03-16 | Crossley Motors Ltd | Improvements in or relating to weights for balancing cranks |
| GB403148A (en) * | 1932-07-07 | 1933-12-21 | Frederick Henry Royce | Improvements in connecting metal parts of engines which are subject to stress |
| CH383083A (en) * | 1960-03-14 | 1964-10-15 | Schweizerische Lokomotiv | crankshaft |
| CN204458789U (en) * | 2015-02-27 | 2015-07-08 | 济南格蓝压缩机有限公司 | The angled type reciprocating-piston compressor that a kind of balance of shaking force is optimized |
| CN108397514A (en) * | 2018-02-08 | 2018-08-14 | 奇瑞汽车股份有限公司 | Three-cylinder engine balance shaft |
| CN208951219U (en) * | 2018-10-19 | 2019-06-07 | 绵阳凯盟科技有限公司 | Balance shaft |
-
2020
- 2020-05-12 CN CN202010399592.4A patent/CN111561511A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB124883A (en) * | 1918-04-03 | 1919-04-03 | William Douglas | Improvements in or relating to Crank-shafts for Engines. |
| GB176583A (en) * | 1921-01-13 | 1922-03-16 | Crossley Motors Ltd | Improvements in or relating to weights for balancing cranks |
| GB403148A (en) * | 1932-07-07 | 1933-12-21 | Frederick Henry Royce | Improvements in connecting metal parts of engines which are subject to stress |
| CH383083A (en) * | 1960-03-14 | 1964-10-15 | Schweizerische Lokomotiv | crankshaft |
| CN204458789U (en) * | 2015-02-27 | 2015-07-08 | 济南格蓝压缩机有限公司 | The angled type reciprocating-piston compressor that a kind of balance of shaking force is optimized |
| CN108397514A (en) * | 2018-02-08 | 2018-08-14 | 奇瑞汽车股份有限公司 | Three-cylinder engine balance shaft |
| CN208951219U (en) * | 2018-10-19 | 2019-06-07 | 绵阳凯盟科技有限公司 | Balance shaft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352681A (en) * | 2021-12-29 | 2022-04-15 | 中国石油天然气集团有限公司 | Dynamic adjustment type crankshaft balance block structure |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200821 |