CN212272804U - Assembled bent axle - Google Patents
Assembled bent axle Download PDFInfo
- Publication number
- CN212272804U CN212272804U CN202020782269.0U CN202020782269U CN212272804U CN 212272804 U CN212272804 U CN 212272804U CN 202020782269 U CN202020782269 U CN 202020782269U CN 212272804 U CN212272804 U CN 212272804U
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- crankshaft
- balance
- journal
- crank
- fabricated
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Abstract
The utility model provides an assembled bent axle, it includes: 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, and the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body; and a weight, the weight comprising: a connecting portion detachably connected to the crankshaft main body and a balance portion detachably connected to the connecting portion. The utility model discloses an assembled bent axle has solved the higher and balance of current integral bent axle processing cost and has been difficult to the technical problem of guarantee.
Description
Technical Field
The utility model belongs to the internal-combustion engine system field, concretely relates to bent axle of assembled.
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 addition, 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 needed for dynamic balance calculation, and unbalance is concentrated in a specific balance weight and a corresponding angle range.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an assembled bent axle to solve the higher and balance of current integral bent axle processing cost and be difficult to the technical problem who ensures.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
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, and the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body; and a weight, the weight comprising: a connecting portion detachably connected to the crankshaft main body and a balance portion detachably connected to the connecting portion.
In some embodiments of the present invention, the connecting portion is an injection molded part; the balance part is a metal piece.
The utility model discloses an among some embodiments, be equipped with connect the through-hole on the connecting portion, the connecting portion cover is located the bent axle main part is last and is connected with its joint.
In some embodiments of the utility model, the connect through hole with the articulate surface matches, the connecting portion joint in crank department.
In some embodiments of the present invention, the connecting portion is connected to the balance portion.
The utility model discloses an among some embodiments, connecting portion are keeping away from one side of connect the through hole has the sector, be equipped with first joint portion on the sector, be equipped with the second joint portion that matches with it on the balancing portion, first joint portion realizes with the cooperation of second joint portion connecting portion with the balancing portion joint is connected.
The utility model discloses an among some embodiments, first joint portion for the shaping in arc arch on the sector, second joint portion for the shaping in arc recess on the balancing portion, the arc arch peg graft in the arc recess.
In some embodiments of the present invention, the balance portion is located at an outer end of the connecting portion.
Compared with the prior art, the utility model have the following technical effect:
the utility model provides an assembled crankshaft, the crankshaft main body is formed by the main journal, the connecting journal and the crank, the main bearing part can ensure the bearing strength of the crankshaft through integral forming; 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 balance weight of the crankshaft is manufactured by two independent parts through machining, and the machining difficulty of the balance weight can be reduced. Simultaneously, through, the balancing piece passes through the injection molding as connecting portion, and it all can be fixed through the mode of joint location with bent axle main part and balancing unit, and easy assembly can realize required dynamic balance counter weight through chooseing for use the balancing unit of unidimensional, and dynamic balance nature is guaranteed easily.
Drawings
FIG. 1 is a side view of one embodiment of a fabricated crankshaft provided by the present invention;
FIG. 2 is a cross-sectional view of one embodiment of a fabricated crankshaft provided by the present invention;
FIG. 3 is a front view and a D-D cross-sectional view of one embodiment of a connection section provided by the present invention;
fig. 4 is a front view and a cross-sectional view F-F of an embodiment of a balance portion according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the following 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 the assembled 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 integrally cast or forged and a fabricated balance weight 20.
The structure and composition of the two parts will be described in detail below.
< crankshaft body >
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 cross 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 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.
< balance weight >
To balance the inertial forces, the crankshaft also includes a counterbalance 20, the counterbalance 20 serving to balance the unbalanced centrifugal moment of the engine and sometimes also to balance a portion of the reciprocating inertial forces, thereby smoothing the crankshaft rotation.
The weight 20 includes: a connecting portion 21 detachably connected to the crankshaft main body, and a balance portion 22 detachably connected to the connecting portion 21.
Specifically, the balance portion 22 is located at the outermost end of the connection portion 21.
Because the balance weight 20 of the crankshaft is made of two 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 required dynamic balance weight can be realized by selecting the balance parts 22 with different sizes, and the dynamic balance performance is easy to ensure.
For convenience of manufacturing and processing, the balance part 22 is made of a metal piece, and the connecting part 21 is formed by plastic injection molding. Since plastic can be injection molded into various specific shapes by injection molding, the connection portion 21 is provided as an injection molded part, which is particularly suitable for assembling and connecting parts of irregular shapes such as crankshafts. In addition, the injection-molded connecting part, the crankshaft main body and the balance part can be fixed in a clamping and positioning mode, and the assembling and the fixing are easy.
< connection mode of balance weight to crankshaft body >
The balance weight 20 and the crankshaft body 10 are engaged with each other by the following specific structure.
Connecting portion 21 is last to be equipped with connect the via hole 21a, connecting portion 21 passes through connect the via hole 21a cover is located on the bent axle main part 10 and be connected with its joint. More specifically, the clamping connection can be realized by adopting a mode of arranging a positioning structure, and the clamping connection of the positioning structure and the clamping connection can also be realized by directly adopting an interference fit mode.
Normally, the counterweight 20 is arranged at the position of the crank 12, so that the coupling through hole 21a matches the outer surface of the crank 12; the connecting portion 21 is engaged with the crank 12.
< connection mode of balance part and connection part >
The connecting part 21 is connected with the balancing part 22 in a clamping mode so as to realize quick assembly connection of the connecting part and the balancing part.
Specifically, connecting portion 21 is keeping away from one side of connect the through hole 21a has the sector, be equipped with first joint portion 21b on the sector, be equipped with the second joint portion 22b that matches with it on the balancing portion 22, first joint portion 21b is connected with second joint portion 22b joint.
The specific structures of the first clamping portion 21b and the second clamping portion 22b are not unique; in one embodiment, the first fastening portion 21b is an arc-shaped protrusion formed on the fan-shaped surface, and the second fastening portion 22b is an arc-shaped groove formed on the balancing portion 22. The arc-shaped bulge on the sector surface is inserted into the arc-shaped groove on the balance part 22, so that the arc-shaped bulge and the balance part can be clamped and fixed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. An assembled crankshaft, comprising: it includes:
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, and the main journal, the connecting journal and the crank are integrally formed into a crankshaft main body;
and a weight, the weight comprising: a connecting portion detachably connected to the crankshaft main body and a balance portion detachably connected to the connecting portion.
2. A fabricated crankshaft according to claim 1, wherein:
the connecting part is an injection molding part; the balance part is a metal piece.
3. A fabricated crankshaft according to claim 2, wherein:
the connecting portion is provided with a connecting through hole, and the connecting portion is sleeved on the crankshaft main body and is connected with the crankshaft main body in a clamping mode.
4. A fabricated crankshaft according to claim 3, wherein:
the connecting through hole is matched with the outer surface of the crank, and the connecting part is clamped at the crank.
5. The fabricated crankshaft of claim 4, wherein:
the connecting part is connected with the balance part in a clamping manner.
6. A fabricated crankshaft according to claim 5, wherein:
connecting portion are keeping away from one side of connect the via hole has the sector, be equipped with first joint portion on the sector, be equipped with the second joint portion that matches with it on the balance portion, first joint portion realizes with the cooperation of second joint portion connecting portion with the balance portion joint is connected.
7. The fabricated crankshaft of claim 6, wherein:
the first clamping portion is an arc-shaped protrusion formed on the sector surface, the second clamping portion is an arc-shaped groove formed on the balance portion, and the arc-shaped protrusion is inserted in the arc-shaped groove.
8. A fabricated crankshaft according to claim 1, wherein:
the balance part is positioned at the outer end part of the connecting part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020782269.0U CN212272804U (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020782269.0U CN212272804U (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212272804U true CN212272804U (en) | 2021-01-01 |
Family
ID=73878792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020782269.0U Active CN212272804U (en) | 2020-05-12 | 2020-05-12 | Assembled bent axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212272804U (en) |
-
2020
- 2020-05-12 CN CN202020782269.0U patent/CN212272804U/en active Active
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