CN107150306B - Protection method for preventing crankshaft balance weight of diesel engine from colliding with main shaft bushing - Google Patents
Protection method for preventing crankshaft balance weight of diesel engine from colliding with main shaft bushing Download PDFInfo
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- CN107150306B CN107150306B CN201710301166.0A CN201710301166A CN107150306B CN 107150306 B CN107150306 B CN 107150306B CN 201710301166 A CN201710301166 A CN 201710301166A CN 107150306 B CN107150306 B CN 107150306B
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- crankshaft
- oil slinger
- main shaft
- balance weight
- diesel engine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
Abstract
The invention discloses a protection method for preventing a crankshaft counterweight of a diesel engine from colliding with a main shaft bushing, which comprises the following steps: the oil slinger is sheathed on an output end flange of a crankshaft in advance, so that the oil slinger is connected with the crankshaft into a whole, and is simultaneously installed into a machine body together with a main shaft bushing. The invention effectively controls the axial movement range of the crankshaft generated in the process of installing the balance weight and the process of overturning the machine body, ensures that the balance weight fixed on the crankshaft moves in a certain range along with the crankshaft, and the moving position of the balance weight can not be contacted with the main bearing bush, solves the problem of damaging the main bearing bush, and ensures the assembly quality.
Description
Technical Field
The invention belongs to the technical field of diesel engine manufacturing, and particularly relates to a protection method for preventing a crankshaft balance weight of a diesel engine from colliding with a main shaft bushing.
Background
The middle-high speed high power diesel engine crankshaft balance weight mounting process is one of the key processes of diesel engine assembly. According to the technical requirements, the counterweight is installed in two modes, namely, the counterweight is assembled with a crankshaft and then installed on a machine body; the other is that after the crankshaft and the main shaft bushing are installed on the machine body, the balance weights of all the gears of the crankshaft are sequentially installed on the crankshaft, and the assembling relation of the machine body, the crankshaft, the main shaft bushing and the balance weights is shown in figure 4; the main shaft bushing assembly structure has two modes, one mode is that the end surface of the main shaft bushing is lower than the end surface of the machine body, and the mode is shown in figure 5; one way is to have the main bearing shell end face higher than the fuselage end face, see figure 6. The second counterweight mounting method is discussed herein, with the end face of the main bearing shell being higher than the end face of the fuselage.
In order to prevent the axial movement of the crankshaft and the balance weight assembly in the operation process of the diesel engine, the diesel engine is designed with a product crankshaft thrust structure. As the drawing specifies, the crankshaft, the main shaft bush and the balance weight are assembled on the machine body, and then the crankshaft thrust device is installed. In the process of assembling the crankshaft and the balance weight assembly, the crankshaft needs to rotate to a proper position of the circumference in sequence to install the balance weight, and the crankshaft is stressed unevenly under the action of the eccentric force of the balance weight, and the like, so that the crankshaft and the balance weight assembly axially float; because the end face of the main shaft bushing is higher than the end face of the machine body (see fig. 6), the hardness of the material of the balance weight is higher than that of the main shaft bushing (the material of the main shaft bushing is formed by combining a 10# steel back and an alloy layer, and the material of the balance weight is 35# steel), the balance weight firstly contacts the end face of the main shaft bushing, and the balance weight can damage the main shaft bushing.
The fit clearance between the main shaft bushing and the crankshaft is a very important parameter and must meet the requirement; if the end face of the balancing weight collides with the end face of the main shaft bushing, the main shaft bushing is damaged, the installation quality of the main shaft bushing is influenced, the main shaft bushing is abnormally abraded when the diesel engine runs, and major accidents occur when the diesel engine is used.
Disclosure of Invention
The invention aims to effectively control the axial shifting range of the crankshaft generated in the process of installing the balance weight and the process of turning over the machine body of the crankshaft, ensure that the balance weight fixed on the crankshaft shifts along with the crankshaft within a certain range, prevent the shifting position of the balance weight from contacting with a main bearing bush, solve the problem of damaging the main bearing bush and ensure the assembly quality.
The invention achieves the purpose through the following technical scheme, and a protection method for preventing a crankshaft balance weight of a diesel engine from colliding a main shaft bushing comprises the following steps:
step A, gap calculation: the position of a channeling stopping groove of the tool assembly relative to the machine body is designed according to the theoretical distance of an oil slinger relative to the end face of the machine body; the width of the groove is determined by the width of the oil slinger and the clearance between the crankshaft 3 and the main bearing shoe 5.
And B, installing an oil slinger 2, selecting the oil slinger 2 with the size of being in interference fit with the output end flange of the crankshaft 3, sleeving the oil slinger 2 on the output end flange of the crankshaft 3 in a hot manner, connecting the oil slinger 2 and the crankshaft 3 into a whole, and installing the whole crankshaft 3 into the machine body 1.
And step C, mounting the tool assembly, clamping a groove formed by a protective plate 11 and a protective baffle 9 of the tool assembly into a left shoulder and a right shoulder of the oil slinger 2 respectively, and mounting the tool assembly to the end face of the output end of the diesel engine body by using a fixing bolt 13 to be fastened with the diesel engine body 1.
And D, mounting the balance weights, sequentially rotating the crankshafts, respectively mounting the balance weights to the relative positions of the crankshafts, and controlling the axial movement range of the crankshafts by the tools on the left side and the right side in the process of mounting the balance weights 4 and turning the machine body 1 so as to protect the end surfaces of the balance weights 4 and the main shaft bush 5 from being contacted.
The tool assembly comprises two tools, and each tool comprises a protection plate 11 and a protection baffle 9; the protection shield (11) is fixed on the protection frame body through set screws (12), the protection baffle (9) is fixed on the protection frame body through connecting bolts (10), and the two tools are fixed to the surfaces of the left side protection frame body 7 and the right side protection frame body 8 of the diesel engine body through fixing bolts 13 respectively.
Preferably, the gap between the balance weight 4 and the main bearing bush 5 is calculated theoretically, and when the crankshaft thrust device is not installed, the axial moving range of the crankshaft is larger than the gap between the balance weight 4 and the main bearing bush 5, so the axial moving range of the crankshaft needs to be controlled.
Preferably, when the oil slinger 2 is sleeved in the step B, the oil slinger 2 is heated through heating equipment, the heated oil slinger 2 is sleeved on the flange at the output end of the crankshaft 3, and after the oil slinger 2 is cooled, the oil slinger 2 is in interference fit with the flange at the output end of the crankshaft 3, so that the oil slinger 2 and the crankshaft 3 are connected into a whole.
Preferably, the tool assembly is formed by symmetrically installing the two tools on the left side protection frame body 7 and the right side protection frame body 8, and the structures of the left side protection frame body 7 and the right side protection frame body 8 are consistent.
The invention has the beneficial effects that: the invention effectively controls the axial shifting range of the crankshaft generated in the process of installing the balance weight and the process of overturning the machine body of the crankshaft, ensures that the balance weight fixed on the crankshaft shifts within a certain range along with the crankshaft, and the shifting position of the balance weight can not be contacted with the main shaft bush, solves the problem of damaging the main shaft bush, ensures the assembly quality, can ensure the assembly precision of the main shaft bush of the crankshaft when the high-speed and high-power diesel engine is assembled in progress, and improves the process stability of the crankshaft assembling balance weight.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the F-direction structure of the present invention;
FIG. 3 is a schematic structural view of a left side fender bracket body according to the present invention;
FIG. 4 is a schematic view of a prior art counterweight mounting arrangement according to the present invention;
FIG. 5 is a schematic view of a spindle bush end face lower than a machine body end face in a spindle bush assembly structure according to the prior art of the present invention;
fig. 6 is a schematic structural view illustrating a spindle bush end surface higher than a machine body end surface in a spindle bush assembling structure according to the prior art as a whole.
In the figure: 1. fuselage, 2, oil slinger, 3, bent axle, 4, balanced heavy, 5, main shaft tile, 6, connecting rod, 7, left side fender bracket body, 8, right side fender bracket body, 9, protection baffle, 10, connecting bolt, 11, protection shield, 12, holding screw, 13, fixing bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the technical scheme provided by the invention, as shown in fig. 3, the tool assembly comprises two tools, wherein each tool comprises a protection plate 11 and a protection baffle 9; the protection shield 11 is fixed on the fender bracket body through a set screw 12, the protection baffle 9 is fixed on the fender bracket body through a connecting bolt 10, and the two tools are fixed on the surfaces of the left side fender bracket body 7 and the right side fender bracket body 8 of the diesel engine body through fixing bolts 13 respectively.
As shown in fig. 2, the tooling assembly is formed by symmetrically installing two tooling on the left side protection frame body 7 and the right side protection frame body 8 respectively, and the structures of the left side protection frame body 7 and the right side protection frame body 8 are consistent, namely the positions a-a and B-B in the figure.
The first embodiment is as follows:
a protection method for preventing a crankshaft balance weight of a diesel engine from colliding with a main shaft bushing comprises the following steps:
step A, gap calculation: the position of a channeling stopping groove of the tool assembly relative to the machine body is designed according to the theoretical distance of an oil slinger relative to the end face of the machine body; the width of the groove is determined according to the width of an oil slinger and the gap between the crankshaft 3 and the main shaft bush 5, the gap between the balance weight 4 and the main shaft bush 5 is calculated theoretically, and when a crankshaft thrust device is not installed, the axial moving range of the crankshaft is larger than the gap between the balance weight 4 and the main shaft bush 5, so that the axial moving range of the crankshaft needs to be controlled.
B, installing an oil slinger 2, selecting the oil slinger 2 with the size of being in interference fit with the output end flange of the crankshaft 3, hot-sleeving the oil slinger 2 to the output end flange of the crankshaft 3, connecting the oil slinger 2 and the crankshaft 3 into a whole, installing the whole crankshaft 3 into the machine body 1, heating the oil slinger 2 through heating equipment when the oil slinger 2 is hot-sleeved, sleeving the heated oil slinger 2 on the output end flange of the crankshaft 3, and after the hot-sleeved oil slinger 2 is cooled, realizing interference fit with the output end flange of the crankshaft 3 to connect the oil slinger 2 and the crankshaft 3 into a whole;
step C, installing a tool assembly, clamping a protection plate 11 of the tool assembly and a groove formed by a protection baffle 9 into a left convex shoulder and a right convex shoulder of the oil slinger 2 respectively, installing the tool assembly to the end face of the output end of the diesel engine body and fastening the tool assembly with the engine body 1 by using a fixing bolt 13, installing the tool assembly by using a symmetrical structure, fixing the protection plate 11 on the surface of a protection frame body by using a set screw 12, fixing the protection baffle 9 on the surface of the protection frame body by using a connecting bolt 10, symmetrically installing the tool assembly by using a left protection frame body 7 and a right protection frame body 8, and enabling the structures of the left protection frame body 7 and the right protection frame body 8 to be.
And D, installing a main shaft bush 5 and each gear of balance weight 4 of the crankshaft 3, installing the main shaft bush 5 firstly, installing the balance weight to the corresponding position of each crankshaft after the main shaft bush 5 is installed, and controlling the axial movement range of the crankshaft by the left and right side tools in the process of installing the balance weight 4 and turning the machine body 1, so as to protect the end surfaces of the balance weight 4 and the main shaft bush 5 from being contacted. The method is suitable for assembling large diesel engines, and can effectively solve the problem of damaging the main bearing bush.
Example two:
a protection method for preventing a crankshaft balance weight of a diesel engine from colliding with a main shaft bushing comprises the following steps:
step A, gap calculation: the position of a channeling stopping groove of the tool assembly relative to the machine body is designed according to the theoretical distance of an oil slinger relative to the end face of the machine body; the width of the groove is determined according to the width of an oil slinger and the gap between the crankshaft 3 and the main shaft bush 5, the gap between the balance weight 4 and the main shaft bush 5 is calculated theoretically, and when a crankshaft thrust device is not installed, the axial moving range of the crankshaft is larger than the gap between the balance weight 4 and the main shaft bush 5, so that the axial moving range of the crankshaft needs to be controlled.
And B, installing an oil slinger 2, selecting the oil slinger 2 with the size of being in interference fit with the output end flange of the crankshaft 3, hot-sleeving the oil slinger 2 to the output end flange of the crankshaft 3, connecting the oil slinger 2 and the crankshaft 3 into a whole, installing the whole crankshaft 3 into the machine body 1, heating the oil slinger 2 through heating equipment when the oil slinger 2 is hot-sleeved, sleeving the heated oil slinger 2 on the output end flange of the crankshaft 3, and after the hot-sleeved oil slinger 2 is cooled, realizing interference fit with the output end flange of the crankshaft 3 to connect the oil slinger 2 and the crankshaft 3 into a whole.
Step C, installing a tool assembly, clamping a protection plate 11 of the tool assembly and a groove formed by a protection baffle 9 into a left convex shoulder and a right convex shoulder of the oil slinger 2 respectively, installing the tool assembly to the end face of the output end of the diesel engine body and fastening the tool assembly with the engine body 1 by using a fixing bolt 13, installing the tool assembly by using a symmetrical structure, fixing the protection plate 11 on the surface of a protection frame body by using a set screw 12, fixing the protection baffle 9 on the surface of the protection frame body by using a connecting bolt 10, symmetrically installing the tool assembly by using a left protection frame body 7 and a right protection frame body 8, and enabling the structures of the left protection frame body 7 and the right protection frame body 8 to be.
And D, installing a main shaft bush 5 and each gear of balance weight 4 of the crankshaft 3, installing the main shaft bush 5 firstly, installing the balance weight to the corresponding position of each crankshaft after the main shaft bush 5 is installed, and controlling the axial movement range of the crankshaft by the left and right side tools in the process of installing the balance weight 4 and turning the machine body 1, so as to protect the end surfaces of the balance weight 4 and the main shaft bush 5 from being contacted. The method is suitable for assembling small diesel engines, and can effectively solve the problem of damaging the main bearing bush.
Example three:
a protection method for preventing a crankshaft balance weight of a diesel engine from colliding with a main shaft bushing comprises the following steps:
step A, gap calculation: the position of a channeling stopping groove of the tool assembly relative to the machine body is designed according to the theoretical distance of an oil slinger relative to the end face of the machine body; the width of the groove is determined according to the width of an oil slinger and the gap between the crankshaft 3 and the main shaft bush 5, the gap between the balance weight 4 and the main shaft bush 5 is calculated theoretically, and when a crankshaft thrust device is not installed, the axial moving range of the crankshaft is larger than the gap between the balance weight 4 and the main shaft bush 5, so that the axial moving range of the crankshaft needs to be controlled.
B, installing an oil slinger 2, selecting the oil slinger 2 with the size of being in interference fit with the output end flange of the crankshaft 3, hot-sleeving the oil slinger 2 to the output end flange of the crankshaft 3, connecting the oil slinger 2 and the crankshaft 3 into a whole, installing the whole crankshaft 3 into the machine body 1, heating the oil slinger 2 through heating equipment when the oil slinger 2 is hot-sleeved, sleeving the heated oil slinger 2 on the output end flange of the crankshaft 3, and after the hot-sleeved oil slinger 2 is cooled, realizing interference fit with the output end flange of the crankshaft 3 to connect the oil slinger 2 and the crankshaft 3 into a whole;
step C, installing a tool assembly, clamping a protection plate 11 of the tool assembly and a groove formed by a protection baffle 9 into a left convex shoulder and a right convex shoulder of the oil slinger 2 respectively, installing the tool assembly to the end face of the output end of the diesel engine body and fastening the tool assembly with the engine body 1 by using a fixing bolt 13, installing the tool assembly by using a symmetrical structure, fixing the protection plate 11 on the surface of a protection frame body by using a set screw 12, fixing the protection baffle 9 on the surface of the protection frame body by using a connecting bolt 10, symmetrically installing the tool assembly by using a left protection frame body 7 and a right protection frame body 8, and enabling the structures of the left protection frame body 7 and the right protection frame body 8 to be.
And D, installing the main shaft bush 5 and each gear of balance weight 4 of the crankshaft 3, installing the main shaft bush 5 and the crankshaft 3 firstly, then installing the balance weight to the relative position of each crankshaft, and controlling the axial movement range of the crankshaft by the left and right side tools in the process of installing the balance weight 4 and turning the machine body 1, so as to protect the end surfaces of the balance weight 4 and the main shaft bush 5 from being contacted.
The method is suitable for assembling the medium-sized diesel engine, and can effectively solve the problem of damaging the main shaft bushing.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A protection method for preventing a crankshaft balance weight of a diesel engine from colliding with a main shaft bushing is characterized by comprising the following steps: the protection method comprises the following steps:
step A, gap calculation: the position of the channeling stopping groove of the tool assembly relative to the machine body is designed according to the theoretical distance of the oil slinger (2) relative to the end face of the machine body; the width of the groove is determined according to the width of the oil slinger (2) and the gap between the crankshaft (3) and the main shaft bush (5);
b, installing an oil slinger (2), selecting the oil slinger (2) with the size of interference fit with the output end flange of the crankshaft (3), sleeving the oil slinger (2) on the output end flange of the crankshaft (3) in a hot-sleeving manner, connecting the oil slinger (2) and the crankshaft (3) into a whole, and simultaneously installing a main shaft bush (5) and the whole crankshaft (3) into the machine body (1);
c, mounting a tool assembly, namely clamping grooves formed by a protective plate (11) and a protective baffle (9) of the tool assembly into a left convex shoulder and a right convex shoulder of the oil slinger (2) respectively, and mounting the tool assembly to the end surface of the output end of the diesel engine body by using a fixing bolt (13) to be fastened with the diesel engine body (1);
d, mounting the balance weights, sequentially rotating the crankshafts (3), mounting each balance weight to the corresponding position of each crankshaft, and controlling the axial movement range of the crankshafts by the tools on the left side and the right side in the process of mounting the balance weights (4) and turning the machine body (1) so as to protect the balance weights (4) from contacting with the end faces of the main bearing bushes (5);
the tool assembly comprises two tools, and each tool comprises a protection plate (11) and a protection baffle (9); the protection shield (11) is fixed on the protection frame body through a set screw (12), the protection baffle (9) is fixed on the protection frame body through a connecting bolt (10), and the two tools are fixed on the surfaces of the left side protection frame body (7) and the right side protection frame body (8) of the diesel engine body through fixing bolts (13) respectively.
2. The method for protecting a crankshaft counterweight of a diesel engine against collision with a main bearing shell as claimed in claim 1, wherein: the gap between the balance weight (4) and the main shaft bush (5) is calculated theoretically, and when the crankshaft thrust device is not installed, the axial moving range of the crankshaft is larger than the gap between the balance weight (4) and the main shaft bush (5), so that the axial moving range of the crankshaft needs to be controlled.
3. The method for protecting a crankshaft counterweight of a diesel engine against collision with a main bearing shell as claimed in claim 1, wherein: and B, when the oil slinger (2) is sleeved in the step B, the oil slinger (2) is heated through heating equipment, the heated oil slinger (2) is sleeved on the output end flange of the crankshaft (3), and after the oil slinger (2) is cooled, the oil slinger is in interference fit with the output end flange of the crankshaft (3), so that the oil slinger (2) and the crankshaft (3) are connected into a whole.
4. The method for protecting a crankshaft counterweight of a diesel engine against collision with a main bearing shell as claimed in claim 1, wherein: the tool assembly is composed of two tools which are symmetrically installed on a left side protection frame body (7) and a right side protection frame body (8) respectively, and the structures of the left side protection frame body (7) and the right side protection frame body (8) are consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710301166.0A CN107150306B (en) | 2017-05-02 | 2017-05-02 | Protection method for preventing crankshaft balance weight of diesel engine from colliding with main shaft bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710301166.0A CN107150306B (en) | 2017-05-02 | 2017-05-02 | Protection method for preventing crankshaft balance weight of diesel engine from colliding with main shaft bushing |
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| CN107150306A CN107150306A (en) | 2017-09-12 |
| CN107150306B true CN107150306B (en) | 2020-12-08 |
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| CN201710301166.0A Active CN107150306B (en) | 2017-05-02 | 2017-05-02 | Protection method for preventing crankshaft balance weight of diesel engine from colliding with main shaft bushing |
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| CN110375683B (en) * | 2019-07-11 | 2021-01-12 | 浙江义利汽车零部件有限公司 | Method and system for measuring axial clearance of crankshaft and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4336563B2 (en) * | 2003-10-29 | 2009-09-30 | ヤンマー株式会社 | Balancer shaft |
| KR100580695B1 (en) * | 2004-05-31 | 2006-05-15 | 현대자동차주식회사 | Mounting apparatus for crank shaft and connecting rod |
| CN200971912Y (en) * | 2006-10-25 | 2007-11-07 | 安徽江淮汽车股份有限公司 | Crankshaft of 2-8L pressure middle cold diesel engine |
| CN201377513Y (en) * | 2009-02-27 | 2010-01-06 | 金坛柴油机有限公司 | Self-lubricating crank shaft of single-cylinder diesel engine |
| CN201851585U (en) * | 2010-10-16 | 2011-06-01 | 常州亚美柯机械设备有限公司 | Diesel engine crankshaft balance assembly |
| CN103388615A (en) * | 2012-05-10 | 2013-11-13 | 安徽华菱汽车有限公司 | Crankshaft |
| CN204041860U (en) * | 2014-09-22 | 2014-12-24 | 广西玉柴机器股份有限公司 | Crankshaft balance weight |
| CN106346238B (en) * | 2015-07-16 | 2019-01-08 | 上海电气电站设备有限公司 | The mounting tool and its application method of turbine rotor dynamic balance weight |
| CN204935533U (en) * | 2015-09-21 | 2016-01-06 | 中国长江电力股份有限公司 | Disc erecting tools under the shaftless inland waters guide bearing of a kind of franc turbine |
| CN106041566B (en) * | 2016-08-02 | 2019-10-25 | 陕西柴油机重工有限公司 | A kind of crankshaft balance weight sharp processing device and method |
| CN106271382B (en) * | 2016-08-30 | 2018-11-02 | 合肥通用机械研究院有限公司 | A kind of compressor production assembly line balance weight hot pressing assembly equipment |
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