CN114704615A - Creep-resistant transmission shell and assembly process - Google Patents
Creep-resistant transmission shell and assembly process Download PDFInfo
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- CN114704615A CN114704615A CN202210354302.3A CN202210354302A CN114704615A CN 114704615 A CN114704615 A CN 114704615A CN 202210354302 A CN202210354302 A CN 202210354302A CN 114704615 A CN114704615 A CN 114704615A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 17
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 47
- 229910000838 Al alloy Inorganic materials 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims 1
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 16
- 108090000565 Capsid Proteins Proteins 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
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- 230000033001 locomotion Effects 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
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- 239000000463 material Substances 0.000 description 4
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- 230000008901 benefit Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 239000003562 lightweight material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
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- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
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Abstract
The application provides a resistant creep derailleur casing and assembly process, this resistant creep derailleur casing includes and comprises procapsid and well casing by magnesium alloy to adopt locking bolt assembly to connect between procapsid and well casing in the front, locking bolt assembly adopts tenon fourth of the twelve earthly branches structure and procapsid and back shell connection, thereby can reduce the pretightning force at bolt position, ensures simultaneously that bolt position can not take place to become flexible. And the front shell and the middle shell of the rigid bolt and the magnesium alloy are isolated by the bolt gasket and the nut gasket, so that electrochemical corrosion among the steel bolt, the nut and the magnesium alloy shell is avoided. In addition, the application also provides an assembly process of the creep-resistant transmission shell, and the assembly process is adopted to assemble the transmission shell, so that the compressive stress on the magnesium alloy shell due to the pretightening force of the bolts is further reduced, and the corrosion resistance of the magnesium alloy transmission shell assembly is improved.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of automotive transmission technologies, and more particularly, to a creep-resistant transmission housing and an assembly process.
Background
The transmission shell is a main part of the whole transmission system and plays a role in supporting a gear, a shafting and an actuating mechanism. The common material of the passenger car transmission shell is aluminum alloy, and the forming process is aluminum alloy die casting. Along with the increasing importance of energy conservation and emission reduction in the automobile industry, the light weight of the automobile is more and more emphasized. The passenger car transmission shell is also changed from the prior cast iron transmission shell to the prior cast aluminum alloy transmission shell, and the future change is to the cast magnesium alloy transmission shell, and the magnesium alloy material is the lightest metal structural material at present among a plurality of automobile lightweight materials. The density is only 2/3 for aluminum and 1/4 for steel, and the weight can be reduced by 30 percent by replacing the aluminum alloy transmission shell with the magnesium alloy transmission shell, and simultaneously, the noise and the vibration are reduced. Therefore, magnesium alloy materials are undoubtedly the first choice for weight reduction of the transmission case.
At present, a magnesium alloy transmission case and an aluminum alloy transmission case are arranged in a transmission case of a passenger vehicle, the magnesium alloy transmission case is lighter than the aluminum alloy transmission case by 30 percent and is the future development direction, but the magnesium alloy transmission case is not used due to the low hardness of magnesium alloy, deformation and looseness of bolt parts, electrochemical corrosion and the like. The existing manufacturing method of the magnesium alloy transmission case with super-strong corrosion resistance discloses the problem that the magnesium alloy has insufficient oxidation resistance and corrosion resistance in the lightweight design of the transmission case, but does not disclose the problems of bolt loosening and electrochemical corrosion between a steel bolt and the magnesium alloy transmission case.
Aiming at the problems that the bolt is easy to loosen and electrochemical corrosion occurs, the following reasons mainly summarize:
after the magnesium alloy transmission shell is assembled, in order to prevent the bolt position from loosening, larger pretightening force can be applied to the bolt, therefore, the contact position of the bolt and the magnesium alloy transmission shell has larger compressive stress, because the hardness of the magnesium alloy transmission shell is lower and the high-temperature creep resistance is poorer, under the larger compressive stress, the magnesium alloy transmission shell can be caused to generate yield deformation at the position, and meanwhile, when the magnesium alloy transmission shell works, the temperature can be increased to about 100 ℃, the creep deformation of the magnesium alloy transmission shell can be caused to occur at the bolt position under the larger stress, and the result of the yield and the creep deformation of the magnesium alloy transmission shell at the bolt position can be caused to loosen.
The contact part of the magnesium alloy transmission shell and the steel bolt is easy to generate electrochemical corrosion due to potential difference.
Disclosure of Invention
In view of the above, it is an object of one or more embodiments of the present disclosure to provide a creep resistant transmission case and assembly process that addresses the problems of bolt loosening and susceptibility to electrochemical corrosion due to potential differences.
In a first aspect, a creep-resistant transmission case is provided, the creep-resistant transmission case including a front case, a middle case, and a bolt assembly; wherein,
the bolt assembly comprises a bolt penetrating through the front shell and the middle shell, and a bolt gasket and a nut gasket sleeved on the bolt;
the bolt gasket is provided with a first surface and a second surface of an concavo-convex structure;
the first surface of the bolt gasket is matched with one surface of the end part of the bolt facing the front shell to form a first mortise and tenon structure;
the second surface of the bolt gasket is matched with the front shell to form a second mortise and tenon structure;
the nut gasket is provided with a third surface with a concave-convex structure and a fourth surface with a plane structure;
a third surface of the nut gasket is matched with one surface of the middle shell, which faces away from the front shell, to form a third mortise and tenon structure;
and a nut in threaded connection with the bolt is pressed on the fourth surface of the nut gasket.
Through forming first tenon fourth of twelve earthly branches structure and second tenon fourth of twelve earthly branches structure between bolt gasket and bolt tip and the procapsid to make can not take place relative motion between bolt, bolt gasket and the procapsid, the convex-concave matches before nut gasket and well casing in the same way constitutes third tenon fourth of twelve earthly branches structure, has guaranteed that nut gasket and well casing do not take place relative motion, and this kind of connection structure can reduce the pretightning force at bolt position, ensures simultaneously that bolt position can not take place not hard up.
In a specific possible embodiment, the front shell and the middle shell are both provided with screw holes for the bolts to pass through;
the bolt washer is located between the bolt and the front housing; the bolt gasket blocks the bolt from directly contacting the front shell;
the nut washer is located between the nut and the middle shell. The nut gasket blocks the nut from directly contacting the middle shell.
In a specific possible embodiment, the bolt washer and the nut washer are both aluminum alloy washers. The front shell and the middle shell are both magnesium alloy shells. The aluminum alloy gasket separates the rigid bolt assembly and the magnesium alloy gearbox shell, and electrochemical corrosion reaction caused by direct contact is avoided.
In a specific possible embodiment, the diameter of the bolt washer is greater than the diagonal diameter of the bolt; the nut washer has a diameter greater than a diagonal diameter of the nut. The aluminum alloy gasket is larger than the end part of the bolt and the nut in volume, so that the contact area of the aluminum alloy gasket and the magnesium alloy shell is increased, and the pressure stress generated on the magnesium alloy shell due to the pretightening force of the bolt is further reduced.
In a specific embodiment, one surface of the bolt end facing the front shell is circumferentially provided with a first concave-convex surface matched with the first surface of the bolt gasket;
a second concave-convex surface matched with the second surface of the bolt gasket is circumferentially arranged on the periphery of the screw hole in the front shell;
the concave-convex position of the first concave-convex surface and the concave-convex position of the second concave-convex surface are staggered. The concave-convex distribution is reasonably designed.
In a specific practical embodiment, a third concave-convex surface is circumferentially arranged on the periphery of the screw hole of the middle shell;
and a third surface of the nut gasket is correspondingly inserted into the third concave-convex surface in a concave-convex manner. The distribution design is reasonable, and the tenon fourth of the twelve earthly branches structure is firm.
In a specific embodiment, the nut compresses the fourth surface of the nut washer as the nut is threaded onto the bolt. The spiral process is smooth and unimpeded.
In a second aspect, a process for assembling a creep resistant transmission housing is provided, comprising the steps of:
buckling the front shell and the middle shell, wherein the screw holes are opposite;
inserting and matching a second surface of the bolt gasket with a second concave-convex surface of the front shell to form a second mortise and tenon structure;
inserting bolts into screw holes so that the bolts penetrate through the front shell and the middle shell;
adjusting the position of a first concave-convex surface of the bolt to enable the first concave-convex surface to be in a first mortise-tenon structure after being in inserted fit with the first surface of the bolt gasket;
a nut gasket is sleeved at one end of the bolt, which is exposed out of the middle shell, and is in inserting fit with a third concave-convex surface of the middle shell to form a third mortise-tenon structure after the position of a third surface of the nut gasket is adjusted;
the nut is in threaded connection with the bolt and compresses the bolt gasket and the nut gasket.
The bolt washer is positioned between the bolt and the front housing, and the diameter of the bolt washer is greater than the diagonal diameter of the bolt;
the nut gasket is located between the nut and the middle shell, and the diameter of the nut gasket is larger than the diagonal diameter of the nut.
The bolt gasket and the nut gasket reduce the compressive stress on the front shell and the middle shell due to the bolt pretightening force. The bolt gasket blocks the bolt from electrochemical corrosion with the front shell; the nut gasket blocks the nut from electrochemical corrosion with the middle shell.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.
FIG. 1 is a cross-sectional structural view of a creep-resistant transmission case provided by an embodiment of the present application;
fig. 2 is a schematic structural diagram of a front case provided in an embodiment of the present application;
fig. 3 is a top view of a bolt washer provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In order to facilitate understanding of the creep-resistant transmission housing provided by the embodiment of the application, an application scenario of the creep-resistant transmission housing is firstly explained, the creep-resistant transmission housing is applied to a vehicle transmission, along with the fact that the advantage of a magnesium alloy housing is continuously highlighted, after the magnesium alloy transmission housing is assembled, in order to prevent bolt parts from loosening, large pretightening force can be applied to bolts, and therefore the contact parts of the creep-resistant transmission housing and the bolts have large compressive stress, the magnesium alloy transmission housing has low hardness and poor high-temperature creep resistance, the transmission housing can be subjected to yield deformation at the parts under the large compressive stress, meanwhile, when the transmission housing works, the temperature can be increased to about 100 ℃, the transmission housing can be subjected to creep deformation at the bolt parts under the large stress, and the bolts can loosen as a result of yielding and creeping at the bolt parts. The contact part of the magnesium alloy transmission shell and the steel bolt is easy to generate electrochemical corrosion due to potential difference. To this end, embodiments of the present application provide a creep resistant transmission case and assembly process, which are described in detail below with reference to the specific figures.
Referring to FIG. 1, FIG. 1 illustrates a structural cross-sectional view of a creep-resistant transmission case provided by an embodiment of the present application; the creep-resistant transmission housing provided by the embodiment of the application comprises a front housing 3 and a middle housing 4; in the process of continuously updating the technology of the transmission shell of the passenger vehicle, the prior cast iron transmission shell is replaced by the prior cast aluminum alloy transmission shell, the cast aluminum alloy transmission shell is changed into the cast magnesium alloy transmission shell in the future, and the magnesium alloy material is the lightest metal structure material at present among a plurality of light weight materials of automobiles. The density is only 2/3 for aluminum and 1/4 for steel, and the weight can be reduced by 30 percent by replacing the aluminum alloy transmission shell with the magnesium alloy transmission shell, and simultaneously, the noise and the vibration are reduced. Therefore, magnesium alloy materials are undoubtedly the first choice for weight reduction of the transmission case.
In view of the above description, the front housing 3 and the middle housing 4 in the present application both use magnesium alloy housings, which has the advantage of light weight of the transmission housing; however, after the existing magnesium alloy transmission shell is assembled, in order to prevent the bolt part from loosening, a large pretightening force can be applied to the bolt 1, and therefore a large compressive stress can be generated on the bolt contact part, because the magnesium alloy transmission shell is low in hardness and poor in high-temperature creep resistance, under the large compressive stress, the transmission shell can be caused to generate yielding deformation on the bolt part, and meanwhile, when the transmission shell works, the temperature can be increased to about 100 ℃, the transmission shell can be caused to generate creep deformation on the bolt part under the large stress, and the problem that the bolt 1 can be loosened as a result of yielding and creep of the shell on the bolt part is caused is solved.
Referring to fig. 2-3, the bolt assembly includes a bolt 1 penetrating through a front housing 3 and a middle housing 4, the bolt 1 is known to be composed of a screw rod and a nut, screw holes for the screw rod to pass through are formed in the front housing 3 and the middle housing 4, the bolt 1 is a screw hole penetrating through the screw hole of the front housing 3 and then entering the middle housing 4, part of the screw rod is exposed outside the middle housing 4, and a nut 6 is screwed at the exposed end of the screw rod to fix the front housing 3 and the middle housing 4.
However, the conventional bolt 1 and nut 6 use the steel bolt 1 and nut 6 for the purpose of enhancing durability and rust prevention. In order to prevent the problem that the bolt is loosened as a result of the fact that the transmission shell generates yield deformation at the position due to the fact that the bolt 1 applies larger pretightening force, and the temperature of the transmission shell is increased when the transmission shell works, the transmission shell generates creep deformation at the bolt position under larger stress, and the shell at the bolt position generates yield and creep deformation; adopt bolt gasket 2 and nut gasket 5 to realize tenon fourth of twelve earthly branches fixed knot structure to bolt 1 and nut 6 in this application to effectively improve the not hard up problem of bolt 1.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a front case provided in an embodiment of the present application; specifically, the periphery of the screw hole on the front shell 3 is circumferentially provided with a second concave-convex surface matched with the second surface of the bolt gasket 2. The concave-convex structure can be provided with four, six, eight and the like; illustratively, the second concave-convex surface in the present application is provided with six concave-convex structures.
The six concave-convex structures are respectively a bulge a1, a3 and a 5; grooves a2, a4, a 6.
For the convenience of understanding the embodiment of the present application, the upper and lower surfaces of the bolt washer 2 are defined as a first surface and a second surface having a concavo-convex structure; the concave-convex distribution on the first surface and the second surface is staggered in sequence.
The second face of bolt gasket 2 and the second concave-convex face grafting cooperation of procapsid 3 are second tenon fourth of the twelve earthly branches structure.
As shown in fig. 3, fig. 3 is a top view of a second face of a bolt shim provided by an embodiment of the present application; specifically, the second surface of the bolt gasket 2 is also provided with a concave-convex structure which is correspondingly matched with the six concave-convex structures on the second concave-convex surface one by one.
The six concave-convex structures on the second surface are respectively grooves b1, b3 and b 5; projections b2, b4, b 6.
It can thus be seen that projections b2, b4, b6 of the second face of bolt washer 2 are inserted into grooves a2, a4, a6 of front housing 3, and projections a1, a3, a5 of front housing 3 are inserted into grooves b1, b3, b5 of the second face of bolt washer 2, thereby forming the second mortise and tenon structure.
And each concave-convex structure matched with each other is a fan-shaped structure or a trapezoid structure and the like, so that the limitation is not excessive, and the shape capable of forming mortise-tenon insertion is within the protection scope of the application.
It is understood that the concave-convex fan-shaped structure of the front shell 3 is consistent with the concave-convex fan-shaped structure of the second surface of the bolt gasket 2, so that the front shell 3 can be in concave-convex fit to form a mortise-tenon structure after the bolt gasket 2 rotates randomly; for example: the groove b1 can be matched with any one of the projections a1, a3 and a5 in a plugging way; the groove a2 can be in plug-in fit with any one of the bulges b2, b4 and b6, and the like, and the tenon-and-mortise structure can be formed by any concave-convex fit between the two.
When manufacturing bolt gasket 2, when the recess was formed in the process of impacting of bolt gasket 2 second face, then the relative recess position of the first face of bolt gasket 2 formed the arch, analogizes in proper order, and bolt gasket 2's first face recess and second arch are relative all the time. Thereby reducing the manufacturing process when manufacturing the bolt washer 2.
Referring to fig. 1, after the second face of the bolt washer 2 and the second concave-convex face on the front housing 3 form the second mortise and tenon structure, the bolt washer 2 cannot rotate relative to the front housing 3. At this time, the bolt 1 is inserted so that the nut is pressed against the first surface of the bolt washer 2.
The nut is provided with the first unsmooth face of bolt 1 tip towards the one side circumference of procapsid 3 towards the one side of bolt gasket 2 and is provided with the first face matched with of bolt gasket 2. The first face of bolt gasket 2 and the mutual grafting cooperation of the first concave-convex face of bolt 1 form first tenon fourth of the twelve earthly branches structure.
As can be seen by combining the second mortise and tenon structure formed by the bolt gasket 2 and the front shell 3, the six concave-convex structures on the second surface sequentially form staggered concave-convex structures on the first surface after impact, and after the bolt 1 rotates at a proper position, the concave-convex structures on the first concave-convex surface are mutually inserted and matched with the concave-convex structures on the first surface of the bolt gasket 2 to form a first mortise and tenon structure; the structure and principle of first tenon fourth of twelve earthly branches structure and second tenon fourth of twelve earthly branches structure are the same, refer to second tenon fourth of twelve earthly branches structure, do too much to describe here.
After the bolt 1 and the bolt gasket 2 form a first tenon-and-mortise structure, the concave-convex position of the first concave-convex surface and the concave-convex position of the second concave-convex surface are staggered.
It will be appreciated that the first and second faces of the bolt washer 2 are provided with the same relief structure so that both the first and second faces of the bolt washer 2 can be used in conjunction with the front housing 3 or the bolt 1.
After the first surfaces of the bolt 1 and the bolt gasket 2 form a first mortise and tenon structure and the second surface of the bolt gasket 2 and the front shell 3 form a second mortise and tenon structure, relative movement among the bolt 1, the bolt gasket 2 and the front shell 3 cannot occur.
With continuing reference to fig. 1, in order to solve the problems that a contact part of the bolt 1 has a large compressive stress due to a large pretightening force applied by the bolt 1, and a magnesium alloy transmission shell has low hardness and poor high-temperature creep resistance, so that the transmission shell can generate yield deformation at the contact part under the large compressive stress, and meanwhile, when the transmission shell works, the temperature can rise, the transmission shell can generate creep deformation at the bolt part under the large stress, and the bolt can be loosened as a result of yielding and creep of the shell at the bolt 1, a third concave-convex surface is circumferentially arranged on the periphery of a screw hole of the middle shell 4 in the application; the third concave-convex surface is used for being in mortise and tenon connection with the nut gasket 5.
Specifically, 5 suits of nut gasket are on the screw rod, and nut gasket 5 has concave-convex structure's third face, and the third concave-convex of casing 4 in the third face orientation of nut gasket 5 to behind rotatory nut gasket 5, make the concave-convex of third face and the concave-convex of well casing 4 mutually unsmooth cooperation, form third mortise-tenon structure.
A third mortise and tenon structure is formed between the nut gasket 5 and the middle shell 4, so that the nut gasket 5 is limited to rotate relative to the middle shell 4. The third mortise and tenon structure is the same as the second mortise and tenon structure in principle, and is not described in detail herein with reference to the second mortise and tenon structure.
One surface of the nut gasket 5, which is back to the third surface, is a fourth surface with a planar structure; this planar structure is used for cooperating with rotatory nut 6, through 6 threaded connection of nut on the screw rod, makes nut 6 after the plane of gland nut gasket 5 gradually, drives 1 gland bolt gasket 2 of bolt to realize procapsid 3 and well casing 4's stable connection. Thereby effectively avoid exerting great pretightning force because of the bolt, cause bolt contact site to have great compressive stress, because magnesium alloy derailleur casing hardness is lower and high temperature resistant creep performance is relatively poor, under great compressive stress, can lead to derailleur casing to take place the yield deformation at this position, derailleur casing during operation simultaneously, the temperature can rise, can lead to derailleur casing to take place the creep at the bolt position under great stress, the result that takes place to surrender and creep at the casing at bolt position can lead to the not hard up problem of bolt 1.
In addition, since the bolt 1 and the nut 6 are made of rigid materials, electrochemical corrosion is likely to occur at a contact portion between the magnesium alloy transmission case and the steel bolt 1 due to potential difference. For this reason, the bolt washer 2 and the nut washer 5 are both aluminum alloy washers. The front case 3 and the middle case 4 are both magnesium alloy cases. The aluminum alloy gasket separates the rigid bolt assembly and the magnesium alloy gearbox shell, and electrochemical corrosion reaction caused by direct contact is avoided.
It can be seen that the bolt washer 2 is located between the bolt 1 and the front housing 3; the bolt gasket 2 prevents the bolt 1 from directly contacting with the front shell 3; a nut washer 5 is located between the nut 6 and the middle housing 4. The nut washer 5 blocks the nut 6 from directly contacting the middle housing 4. Avoiding the electrochemical corrosion reaction caused by direct contact.
In order to further optimize the looseness prevention and the electrochemical corrosion reaction prevention, the diameter of the bolt gasket 2 is larger than the diagonal diameter of the bolt 1; the nut washer 5 has a diameter greater than the diagonal diameter of the nut 6.
The aluminum alloy gasket is bigger than the end of the bolt 1 and the nut 6, so that the contact area of the aluminum alloy gasket and the magnesium alloy shell is increased, and the compressive stress generated by the pretightening force of the bolt 1 on the magnesium alloy shell is further reduced, and the contact prevention effect is enhanced.
Form first tenon fourth of twelve earthly branches structure and second tenon fourth of twelve earthly branches structure between bolt gasket 2 and 1 tip of bolt and procapsid 3 to make bolt 1, relative motion can not take place between bolt gasket 2 and the procapsid 3, like convex-concave matching before nut gasket 5 and well casing 4 constitutes third tenon fourth of twelve earthly branches structure, has guaranteed that nut gasket 5 and well casing 4 do not take place relative motion, and this kind of connection structure can reduce the pretightning force at 1 position of bolt, ensures simultaneously that 1 position of bolt can not take place to become flexible.
In addition, the present application also provides an assembly process for a creep resistant transmission housing comprising the steps of:
1. the front shell 3 and the middle shell 4 are buckled with each other, and the screw holes are opposite;
2. the second surface of the bolt gasket 2 is in inserting fit with the second concave-convex surface of the front shell 3 to form a second mortise and tenon structure;
3. inserting a bolt 1 into the screw hole, and enabling the bolt 1 to penetrate through the front shell 3 and the middle shell 4;
4. adjusting the position of the first concave-convex surface of the bolt 1 to ensure that the first concave-convex surface is in a first tenon-and-mortise structure after being inserted and matched with the first surface of the bolt gasket 2;
5. a nut gasket 5 is sleeved at one end, exposed out of the middle shell 4, of the bolt 1, and after the position of a third surface of the nut gasket 5 is adjusted, the nut gasket is in inserting fit with a third concave-convex surface of the middle shell 4 to form a third mortise and tenon structure;
6. the nut 6 is screwed with the bolt 1 and compresses the bolt washer 2 and the nut washer 5.
As can be seen from the above process, the bolt washer 2 is located between the bolt 1 and the front housing 3, and the diameter of the bolt washer 2 is greater than the diagonal diameter of the bolt 1;
the nut washer 5 is located between the nut 6 and the middle housing 4, and the diameter of the nut washer 5 is larger than the diagonal diameter of the nut 6.
The bolt washer 2 and the nut washer 5 reduce the compressive stress on the front housing 3 and the middle housing 4 due to the pre-tightening force of the bolt 1. The bolt gasket 2 prevents the bolt 1 and the front shell 3 from being subjected to electrochemical corrosion; the nut washer 5 blocks the nut 6 from electrochemical corrosion with the middle shell 4.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments of the present description as above, which are not provided in detail for the sake of brevity.
Further, for the purposes of simplicity of explanation and discussion, and so as not to obscure one or more embodiments of the present description, apparatus may be shown in block diagram form in order to avoid obscuring one or more embodiments of the present description, and this also takes into account the fact that specifics with respect to implementation of such block diagram apparatus are highly dependent upon the platform within which one or more embodiments of the present description are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., indentations) are set forth in order to describe example embodiments of the disclosure, it will be apparent to one skilled in the art that one or more embodiments of the disclosure may be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.
It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit or scope of the disclosure are intended to be included within the scope of the disclosure.
Claims (10)
1. A creep resistant transmission case comprising a front case, a middle case, and a bolt assembly; wherein,
the bolt assembly comprises a bolt penetrating through the front shell and the middle shell, and a bolt gasket and a nut gasket sleeved on the bolt;
the bolt gasket is provided with a first surface and a second surface of an uneven structure;
the first surface of the bolt gasket is matched with one surface of the end part of the bolt facing the front shell to form a first mortise and tenon structure;
the second surface of the bolt gasket is matched with the front shell to form a second mortise and tenon structure;
the nut gasket is provided with a third surface with a concave-convex structure and a fourth surface with a plane structure;
a third surface of the nut gasket is matched with one surface of the middle shell, which is back to the front shell, to form a third mortise and tenon structure;
and a nut in threaded connection with the bolt is pressed on the fourth surface of the nut gasket.
2. The creep-resistant transmission case of claim 1 wherein the front case and the middle case each have a screw hole formed therein through which the bolt passes;
the bolt washer is located between the bolt and the front housing;
the nut washer is located between the nut and the middle shell.
3. The creep-resistant transmission housing of claim 1 wherein the bolt washer and the nut washer are each aluminum alloy washers.
4. The creep-resistant transmission housing of claim 1, wherein the front housing and the middle housing are both magnesium alloy housings.
5. The creep resistant transmission casing of any one of claims 1 through 4 wherein the bolt washer has a diameter greater than a diagonal diameter of the bolt;
the nut washer has a diameter greater than a diagonal diameter of the nut.
6. The creep-resistant transmission casing of claim 2 wherein a face of the bolt end facing the front housing is circumferentially provided with a first concavo-convex surface for mating with the first face of the bolt washer;
a second concave-convex surface matched with the second surface of the bolt gasket is circumferentially arranged on the periphery of the screw hole in the front shell;
the concave-convex position of the first concave-convex surface and the concave-convex position of the second concave-convex surface are staggered.
7. The creep-resistant transmission case of claim 6, wherein the screw hole of the middle case is circumferentially provided with a third concave-convex surface;
and a third surface of the nut gasket is correspondingly inserted into the third concave-convex surface in a concave-convex manner.
8. The creep-resistant transmission housing of claim 7 wherein the nut compresses the fourth face of the nut washer as the nut is threaded onto the bolt.
9. A process of assembling a creep resistant transmission housing comprising the steps of:
buckling the front shell and the middle shell, wherein the screw holes are opposite;
inserting and matching a second surface of the bolt gasket with a second concave-convex surface of the front shell to form a second mortise and tenon structure;
inserting bolts into screw holes, and enabling the bolts to penetrate through the front shell and the middle shell;
adjusting the position of a first concave-convex surface of the bolt to ensure that the first concave-convex surface is in a first tenon-and-mortise structure after being in inserted fit with the first surface of the bolt gasket;
a nut gasket is sleeved at one end of the bolt, which is exposed out of the middle shell, and is in inserting fit with a third concave-convex surface of the middle shell to form a third mortise-tenon structure after the position of a third surface of the nut gasket is adjusted;
the nut is in threaded connection with the bolt and compresses the bolt gasket and the nut gasket.
10. The process of assembling a creep-resistant transmission housing of claim 9,
the bolt washer is positioned between the bolt and the front housing, and the diameter of the bolt washer is greater than the diagonal diameter of the bolt;
the nut gasket is located between the nut and the middle shell, and the diameter of the nut gasket is larger than the diagonal diameter of the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210354302.3A CN114704615A (en) | 2022-04-06 | 2022-04-06 | Creep-resistant transmission shell and assembly process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210354302.3A CN114704615A (en) | 2022-04-06 | 2022-04-06 | Creep-resistant transmission shell and assembly process |
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| Publication Number | Publication Date |
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| CN114704615A true CN114704615A (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210354302.3A Pending CN114704615A (en) | 2022-04-06 | 2022-04-06 | Creep-resistant transmission shell and assembly process |
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| CN (1) | CN114704615A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1916432A2 (en) * | 2006-10-24 | 2008-04-30 | Voith Turbo GmbH & Co. KG | Shaft connection and underlay profile for such |
| JP3167659U (en) * | 2011-02-21 | 2011-05-12 | 三和機工株式会社 | Casing connection structure |
| CN202431725U (en) * | 2011-12-13 | 2012-09-12 | 东风汽车有限公司 | Bolt connection structure for preventing aluminum alloy galvanic corrosion |
| CN203297293U (en) * | 2013-06-04 | 2013-11-20 | 中联重科股份有限公司渭南分公司 | Anti-loosening gasket for threaded connection structure and threaded connection structure |
| CN204878257U (en) * | 2015-08-14 | 2015-12-16 | 宁波东鑫高强度螺帽有限公司 | Locking threaded fastener that moves |
| RU2689617C1 (en) * | 2018-08-06 | 2019-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тамбовский государственный технический университет" (ФГБОУ ВО "ТГТУ") | Flat-chamber type electrobaromembrane apparatus |
| CN111456998A (en) * | 2020-03-31 | 2020-07-28 | 王双茂 | Anti-loosening connecting bolt |
| CN113294419A (en) * | 2020-11-27 | 2021-08-24 | 浙江斯泰新材料科技股份有限公司 | Fastener with open-loop type vibration absorption locking ring |
| CN215361783U (en) * | 2021-06-07 | 2021-12-31 | 淮南阳光浮体科技有限公司 | Anti-rotation structural part of ear is embraced to body, body connection structure and photovoltaic power plant on water |
-
2022
- 2022-04-06 CN CN202210354302.3A patent/CN114704615A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1916432A2 (en) * | 2006-10-24 | 2008-04-30 | Voith Turbo GmbH & Co. KG | Shaft connection and underlay profile for such |
| JP3167659U (en) * | 2011-02-21 | 2011-05-12 | 三和機工株式会社 | Casing connection structure |
| CN202431725U (en) * | 2011-12-13 | 2012-09-12 | 东风汽车有限公司 | Bolt connection structure for preventing aluminum alloy galvanic corrosion |
| CN203297293U (en) * | 2013-06-04 | 2013-11-20 | 中联重科股份有限公司渭南分公司 | Anti-loosening gasket for threaded connection structure and threaded connection structure |
| CN204878257U (en) * | 2015-08-14 | 2015-12-16 | 宁波东鑫高强度螺帽有限公司 | Locking threaded fastener that moves |
| RU2689617C1 (en) * | 2018-08-06 | 2019-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тамбовский государственный технический университет" (ФГБОУ ВО "ТГТУ") | Flat-chamber type electrobaromembrane apparatus |
| CN111456998A (en) * | 2020-03-31 | 2020-07-28 | 王双茂 | Anti-loosening connecting bolt |
| CN113294419A (en) * | 2020-11-27 | 2021-08-24 | 浙江斯泰新材料科技股份有限公司 | Fastener with open-loop type vibration absorption locking ring |
| CN215361783U (en) * | 2021-06-07 | 2021-12-31 | 淮南阳光浮体科技有限公司 | Anti-rotation structural part of ear is embraced to body, body connection structure and photovoltaic power plant on water |
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