CN113623067A - Adjusting connecting rod, tool for fastening bolt in adjusting connecting rod and fastening method of tool - Google Patents
Adjusting connecting rod, tool for fastening bolt in adjusting connecting rod and fastening method of tool Download PDFInfo
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- CN113623067A CN113623067A CN202010383352.5A CN202010383352A CN113623067A CN 113623067 A CN113623067 A CN 113623067A CN 202010383352 A CN202010383352 A CN 202010383352A CN 113623067 A CN113623067 A CN 113623067A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 230000006835 compression Effects 0.000 claims abstract description 26
- 238000007906 compression Methods 0.000 claims abstract description 26
- 238000003825 pressing Methods 0.000 claims description 30
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 description 8
- 238000000926 separation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
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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
- B25B29/00—Accessories
- B25B29/02—Bolt tensioners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
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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
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/06—Adjustable connecting-rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides an adjusting connecting rod, which is used for a multi-connecting rod type variable compression ratio mechanism and comprises an upper connecting rod seat and a lower connecting rod seat which are buckled to form a central hole, wherein connecting rod bolts for connecting the upper connecting rod seat and the lower connecting rod seat are respectively arranged on two sides of the central hole, the mounting directions of the connecting rod bolts on the two sides are the same, and are respectively a control connecting rod side connecting rod bolt close to a control connecting rod and an execution connecting rod side connecting rod bolt close to an execution connecting rod, a buckling surface is formed between the upper connecting rod seat and the lower connecting rod seat due to the connection, the axis of the execution connecting rod side connecting rod bolt is vertical to the buckling surface, an included angle alpha is formed between the axis of the control connecting rod side connecting rod bolt and the buckling surface, and the included angle alpha is more than or equal to 70 degrees and less than 90 degrees. The invention also provides a tool for fastening the bolt in the adjusting connecting rod and a fastening method thereof. The adjusting connecting rod can avoid overlarge distance between the connecting rod bolt at the side of the control connecting rod and the central hole, and can improve the structural reliability of the adjusting connecting rod when in use.
Description
Technical Field
The invention relates to the technical field of variable compression ratio engines, in particular to an adjusting connecting rod used in a multi-connecting-rod type variable compression ratio mechanism. Meanwhile, the invention also relates to a tool for fastening the bolt in the adjusting connecting rod and a method for fastening the bolt.
Background
In the field of engines, the compression ratio of the engine is changed by changing the top dead center position of the engine piston, so that different engine load requirements are met, the engine can always run in an optimal working area, the power performance of the engine can be improved, the oil consumption is reduced, the engine emission can be reduced, and the contradiction between the power performance, the economy and the emission performance of the engine can be well solved.
At present, as one of the modes of implementing the variable compression ratio of the engine, a multi-link variable compression ratio mechanism has become a structural mode adopted by a plurality of vehicles successively. In a general multi-link variable compression ratio mechanism, it mainly includes a piston, a control link with one end hinged with the piston, an adjusting link hinged with the other end of the control link and rotatably installed on a link journal of a crankshaft, an eccentric shaft and an executing link hinged between the eccentric shaft and the adjusting link, wherein the control link and the executing link are respectively hinged with two opposite ends of the adjusting link.
During the operation of the engine, the ECU controls the driving device to drive the eccentric shaft to rotate if the compression ratio of the engine needs to be adjusted based on the detection of the operation state, the rotation of the eccentric shaft enables the position of the execution connecting rod to change, and the execution connecting rod acts on the piston through the adjustment connecting rod and the control connecting rod, so that the change of the top dead center position of the piston is finally realized, and the purpose of adjusting the compression ratio is achieved.
In the multi-link type variable compression ratio mechanism, the adjusting link is mostly provided with two parts which are mutually buckled by adopting a cracking process, and the two parts are fastened together through a link bolt to form an integral adjusting link and realize the arrangement of the adjusting link on a link journal of a crankshaft. In the prior art, when an adjusting connecting rod is assembled with a crankshaft, the fastening of a connecting rod bolt on the adjusting connecting rod is often complex, the crankshaft is directly placed in a cylinder body to be assembled with the adjusting connecting rod in the traditional assembling method, and the adjusting connecting rod corresponding to each cylinder is difficult to be positioned at the favorable position of assembly at the same time so as to be convenient for screwing the connecting rod bolt, so that the crankshaft corner and the connecting rod corner need to be continuously adjusted in the assembling and fastening process, so that the connecting rod bolt has a sufficient fastening space, but the assembling and fastening efficiency of the adjusting connecting rod is greatly influenced.
In addition, in the structural design of the existing adjusting connecting rod, for avoiding the control connecting rod after assembly, the distance between a connecting rod bolt on one side in the adjusting connecting rod and the rotating center of the adjusting connecting rod is too large, so that the separation risk between the two parts in the adjusting connecting rod is easily increased, and the structural reliability of the adjusting connecting rod during use is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to an adjusting link, which can improve the structural reliability of the adjusting link during use.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an adjusting connecting rod is used in a multi-connecting-rod type variable compression ratio mechanism and comprises an upper connecting rod seat and a lower connecting rod seat, a central hole is formed between the upper connecting rod seat and the lower connecting rod seat in a buckling mode, a control connecting rod hinge hole is formed in the upper connecting rod seat, an execution connecting rod hinge hole is formed in the lower connecting rod seat, and connecting rod bolts for connecting the upper connecting rod seat and the lower connecting rod seat are respectively arranged on two sides of the central hole;
the connecting rod bolts on the two sides are installed in the same direction and are respectively control connecting rod side connecting rod bolts close to the control connecting rod and execution connecting rod side connecting rod bolts close to the execution connecting rod, the upper connecting rod seat and the lower connecting rod seat are connected to form a buckling surface located between the upper connecting rod seat and the lower connecting rod seat, the buckling surface passes through the center of the center hole, the axis of the execution connecting rod side connecting rod bolts is perpendicular to the buckling surface, an included angle alpha is formed between the axis of the control connecting rod side connecting rod bolts and the buckling surface, and the included angle alpha is larger than or equal to 70 degrees and smaller than 90 degrees.
Furthermore, a concave-convex structure meshed with the buckling surface is arranged between the upper connecting rod seat and the lower connecting rod seat.
According to the adjusting connecting rod, the axial line of the bolt of the side connecting rod of the executing connecting rod is perpendicular to the buckling surface, so that the shearing force applied to the bolt of the side connecting rod of the executing connecting rod can be reduced, the stress of the bolt of the side connecting rod of the executing connecting rod is improved, the distance between the bolt of the side connecting rod of the controlling connecting rod and the central hole in the adjusting connecting rod can be reduced by forming the included angle alpha of 70-90 degrees between the axial line of the bolt of the side connecting rod of the controlling connecting rod and the buckling surface, the risk of separating the upper connecting rod seat and the lower connecting rod seat in the adjusting connecting rod can be reduced, and the structural reliability of the adjusting connecting rod in use can be improved.
Meanwhile, the invention also provides a tool for fastening the connecting rod bolt in the adjusting connecting rod, and the tool comprises:
the tool bottom plate is at least provided with a plurality of support plates which are arranged side by side, and a lower crankshaft mounting groove is formed in each support plate;
the crankshaft pressing plates are arranged in one-to-one correspondence with the supporting plates, the crankshaft pressing plates are detachably fixed on the corresponding supporting plates, and each crankshaft pressing plate is provided with an upper crankshaft mounting groove which is buckled with the lower crankshaft mounting groove on the corresponding supporting plate;
the adjusting connecting rod positioning mechanism is arranged on the tool bottom plate and is provided with positioning pin jacks which are respectively arranged at two sides of the crankshaft pressing plate and a plurality of adjusting connecting rod positioning pins which can be plugged and arranged in the positioning pin jacks, and at least one adjusting connecting rod positioning pin is arranged between every two adjacent supporting plates.
Furthermore, each support plate is provided with two sections which are respectively arranged at two sides for breaking at the lower crankshaft mounting groove, the tool bottom plate is also provided with connecting plates which are respectively connected with the support plates at the same section, and the crankshaft pressing plate is respectively connected with the two sections corresponding to the support plates.
Further, a cylinder body connecting hole is formed in the tool bottom plate.
Furthermore, positioning blocks are fixed on the tool bottom plate on two sides of the crankshaft pressing plate, and the positioning pin insertion holes are formed in the positioning blocks.
Furthermore, the supporting plate and/or the crankshaft pressing plate at least one end are/is provided with crankshaft corner positioning holes, and the crankshaft corner positioning holes are respectively arranged on two sides of the lower crankshaft mounting groove or the upper crankshaft mounting groove.
The tool can be used for adjusting the fastening operation of two connecting rod bolts arranged on the connecting rod in the same direction by arranging the crankshaft mounting point and arranging the related mechanism for adjusting the positioning of the connecting rod, so that an operation method which is convenient for fastening the connecting rod bolts and is beneficial to improving the fastening efficiency can be provided.
In addition, the invention also provides a fastening method of the connecting rod bolt in the adjusting connecting rod based on the tool, and the method comprises the following steps:
pre-assembling a piston in the multi-link variable compression ratio mechanism, a control link and the upper link seat in the adjusting link, and pushing the piston into a cylinder;
inverting the cylinder body to enable the upper connecting rod seat (501) to expose out of a cylinder hole of the cylinder body (9), and arranging the tooling bottom plate on the bottom surface of the cylinder body;
placing a crankshaft in the lower crankshaft mounting groove, and positioning the rotation angle of the crankshaft to enable the axis of each connecting rod journal on the crankshaft to be parallel to the bottom surface of the cylinder body;
the crankshaft is pressed through the crankshaft pressing plate, the upper connecting seat is adjusted to the position of the corresponding connecting rod journal, the lower connecting rod seat connected with the execution connecting rod is buckled with the upper connecting rod seat, and the control connecting rod side connecting rod bolt and the execution connecting rod side connecting rod bolt are used for pre-tightening;
positioning the adjusting link by the adjusting link positioning pin so that an axis of one of the control link-side link bolt and the execution link-side link bolt is parallel to the bottom surface, and tightening the control link-side link bolt or the execution link-side link bolt parallel to the bottom surface with a tightening tool;
loosening the pressed crankshaft, rotating the crankshaft by 180 degrees, positioning a corner of the crankshaft so that the axis of each connecting rod journal on the crankshaft is parallel to the bottom surface of the cylinder body, and then pressing the crankshaft;
the adjusting connecting rod is positioned by the adjusting connecting rod positioning pin, the other axis of the control connecting rod side connecting rod bolt and the execution connecting rod side connecting rod bolt is parallel to the bottom surface, and the control connecting rod side connecting rod bolt or the execution connecting rod side connecting rod bolt parallel to the bottom surface is screwed down by a screwing tool.
Further, when the control-link-side link bolt and the execution-link-side link bolt are pre-tightened, the execution-link-side link bolt is pre-tightened first, and when tightened, the control-link-side link bolt is tightened first.
Furthermore, the crankshaft is provided with a flange part positioned at one end of the crankshaft, the flange part is provided with a plurality of threaded holes which are annularly arranged at intervals, and the crankshaft is in threaded connection with one of the threaded holes and is inserted into a crankshaft corner positioning pin in one of the two crankshaft corner positioning holes for performing corner positioning
The fastening method of the connecting rod bolt in the adjusting connecting rod can realize the fastening of two connecting rod bolts which are arranged in the same direction in the adjusting connecting rod, has simple operation process, and does not need to turn over a crankshaft and execute the connecting rod for many times, thereby improving the fastening efficiency of the connecting rod bolt on the adjusting connecting rod.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a multi-link variable compression ratio mechanism according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an adjusting link according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a connecting rod bolt of the adjusting connecting rod according to the first embodiment of the present invention;
FIG. 4 is a schematic layout of a control link-side link bolt and an actuator link-side link bolt according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a tool according to a second embodiment of the present invention;
FIG. 6 is a schematic view of the assembly of the upper link base and the control link according to the third embodiment of the present invention;
fig. 7 is a schematic view of the inverted cylinder according to the third embodiment of the present invention;
fig. 8 is a schematic view of a state in which the tool and the crankshaft according to the third embodiment of the present invention are assembled to a cylinder block;
fig. 9 is a partial enlarged view of a portion a in fig. 8;
FIG. 10 is a schematic view of the connection rod bolt tightening according to the third embodiment of the present invention;
description of reference numerals:
1-a piston, 2-a control connecting rod, 3-a crankshaft, 4-a control connecting rod pin, 5-an adjusting connecting rod, 6-an executing connecting rod pin, 7-an executing connecting rod, 8-an eccentric shaft, 9-a cylinder body, 10-a tool bottom plate, 11-a crankshaft pressing plate, 12-a crankshaft corner positioning hole, 13-a positioning block, 14-an adjusting connecting rod positioning pin, 15-a crankshaft corner positioning pin and 16-a tightening tool;
301-connecting rod journal, 302-flange part, 303-threaded hole;
501-an upper connecting rod seat, 502-a lower connecting rod seat, 503-a central hole, 504-a control connecting rod hinge hole, 505-an execution connecting rod hinge hole, 506-a control connecting rod side connecting rod bolt and 507-an execution connecting rod side connecting rod bolt;
901-cylinder skirt, 902-diaphragm, 903-bottom;
1001-connecting plate, 1002-supporting plate;
m-buckling surface, z-control connecting rod side connecting rod bolt axis.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The present embodiment relates to an adjusting link 5 which is used in a multi-link type variable compression ratio mechanism, and an exemplary structure of the multi-link type variable compression ratio mechanism may be as shown in fig. 1, which specifically includes a piston 1, a control link 2 having one end hinged to the piston 1, and an adjusting link 5 rotatably provided at a link journal 301 in a crankshaft 3, and the other end of the control link 2 is hinged to the adjusting link 5 by a control link pin 4.
Further, the above-described multi-link type variable compression ratio mechanism further includes an eccentric shaft 8, and an actuating link 7 hinged between the eccentric shaft 8 and the adjusting link 5. Wherein, in general, the actuating connecting rod 7 is rotatably mounted on an eccentric shaft 8, and the actuating connecting rod 7 is also connected in an articulated manner to the adjusting connecting rod 5 by means of an actuating connecting rod pin 6. Meanwhile, the control link 2 and the actuating link 7 are hinged to opposite ends of the adjusting link 5, respectively.
The specific principle of the multi-link variable compression ratio mechanism for adjusting the compression ratio and the operation process thereof in the present embodiment can be found in the prior art, and particularly, the related reports of the applicant of the present application.
As shown in fig. 2 and 3, the adjusting link 5 of the present embodiment specifically includes an upper link seat 501 and a lower link seat 502, wherein a central hole 503 is formed between the upper link seat 501 and the lower link seat 502 in a buckling manner, a control link hinge hole 504 is formed on the upper link seat 501, an actuating link hinge hole 505 is formed on the lower link seat 502, and link bolts for connecting the upper link seat 501 and the lower link seat 502 are respectively disposed on two sides of the central hole 503.
In this embodiment, the center hole 503 is formed by buckling, i.e. the adjusting link 5 is sleeved on the link journal 301, and the control link hinge hole 504 is used for inserting the control link pin 4, so as to realize the hinge connection with the control link 2. And the execution link hinge hole 505 is used for inserting the execution link pin 6 to realize the hinge connection with the execution link 7.
In the present embodiment, the attachment directions of the link bolts on both sides of the adjusting link 5 are the same, and in accordance with the arrangement of the adjusting link 5 in the variable compression ratio mechanism as shown in fig. 1, the link bolts divided above to both sides are also the control link-side link bolt 506 close to the control link 2 and the actuating link-side link bolt 507 close to the actuating link 7, respectively.
In addition, since the upper and lower connecting rod bases are connected by buckling, a buckling surface m is formed between the two connecting rod bases due to the connection of the two connecting rod bases, and the buckling surface m is disposed through the center of the central hole 503.
It should be noted that, as a preferred embodiment, the adjusting link 5 including the upper link base 501 and the lower link base 502 may be formed by a stretch breaking process so as to be separated into two parts that can be engaged with each other, and the two parts are, of course, the upper link base 501 and the lower link base 502. At this time, the engagement surface m is also actually a bulging surface on the adjustment link 5.
Since the adjusting link 5 is formed by the expanding-breaking process, a concave-convex structure engaged with the engaging surface m is formed between the upper link seat 501 and the lower link seat 502. At this time, during the operation of the engine, the cylinder explosion pressure acts on the piston 1, the piston 1 transmits the pressure to the control link 2, and the control link 2 transmits the force to the adjusting link 5.
At this time, the two link bolts in the adjusting link 5 bear the force transmitted to the adjusting link 5, and the force borne by each link bolt can be decomposed into a component force along the fastening plane m and a component force perpendicular to the fastening plane m, that is, in the axial direction of the link bolt. Because the engaging concave-convex structure exists at the engaging surface m, the component force along the engaging surface m is mainly shared by the concave-convex structure, so that the component force in the direction received by the connecting rod bolt is smaller. Based on this, the connecting rod bolt mainly bears the component force along the axial direction thereof.
During engine operation, near the maximum explosive pressure, it can be appreciated that the control link-side link bolt 506 is primarily under pressure, while the implement link-side link bolt is primarily under tension. However, when the inertia force is the maximum, the stress conditions of the two side link bolts are opposite, that is, the control link side link bolt 506 mainly bears the tensile force, and the execution link side link bolt mainly bears the pressure. However, since the maximum explosion pressure is much larger than the maximum inertia force, the force applied to actuator-side link bolt 507 is worse than to control-link-side link bolt 506.
Accordingly, in order to reduce the force applied to actuator link-side link bolt 507 and improve the force applied, it is preferable that the axis of actuator link-side link bolt 507 be perpendicular to engagement surface m, that is, the rising cross section of adjustment link 5, as shown in fig. 4.
In this case, if the control link-side link bolt 506 is also provided so as to be perpendicular to the engagement surface m, the distance between the control link-side link bolt 506 and the center hole 503 may need to be increased in order to avoid the control link 2. However, the increased distance between the control-link-side link bolt 506 and the center hole 503 increases the risk of separation of the upper and lower link seats in the adjusting link 5, and decreases the structural stability of the adjusting link 5 in use.
Therefore, the control link side link bolt 506 is preferably stressed, so that the angle α between the axis of the control link side link bolt 506 and the fastening surface m is maintained as shown in fig. 4, and the angle α satisfies 70 ° α < 90 °.
In the present embodiment, by controlling the inclined arrangement of the axis of the link-side link bolt 506, the distance between it and the center hole 503 can be reduced, so as to avoid increasing the risk of separation of the two parts in the adjusting link 5. In addition, the included angle α may be, for example, 70 °, 72 °, 75 °, 80 °, 83 °, or 85 ° in specific implementations.
In the adjusting link 5 of the present embodiment, the axis of the actuating link-side link bolt 507 is perpendicular to the engagement surface m, so that the stress on the actuating link-side link bolt 507 can be improved, and the angle α between the axis of the control link-side link bolt 506 and the engagement surface m can be formed, so that the distance between the control link-side link bolt 506 and the central hole 503 of the adjusting link 5 can be reduced, the risk of separation between the upper link seat 501 and the lower link seat 502 of the adjusting link 5 can be reduced, and the structural reliability of the adjusting link 5 during use can be improved.
Example two
The present embodiment relates to a tool for fastening a connecting rod bolt in the adjusting connecting rod 5 of the first embodiment, so that the adjusting connecting rod 5 is assembled and disposed on the connecting rod journal 301 of the crankshaft 5 when the multi-link variable compression ratio mechanism is assembled.
On the whole constitution, the frock of this embodiment is including being used for installing of bent axle 3 and compressing tightly frock bottom plate and the bent axle pressure strip of location, still including being used for adjusting the regulation connecting rod positioning mechanism of connecting rod 5 location.
As an exemplary structure, as shown in fig. 5, the tool bottom plate 10 in the tool of the present embodiment has a plurality of support plates 1002 arranged side by side, and a lower crankshaft mounting groove is configured on each support plate 1002. Meanwhile, each support plate 1002 is also broken at the lower crankshaft mounting groove thereof, and has two sections respectively disposed at both sides, and the tooling bottom plate 10 of the present embodiment further has connecting plates 1001 respectively connected to the support plates 1002 at the same side.
The tool bottom plate 10 with the above structure can be found to be an integral structure, namely, the tool bottom plate is composed of two brush-shaped structures which are respectively arranged on two sides. In addition, in the present embodiment, a cylinder connecting hole is also provided on the tooling bottom plate 10, and the cylinder connecting hole may be provided at the connecting plate 1001 or at each supporting plate 1002 of the two-stage structure, and in the specific implementation, it is generally arranged corresponding to the bolt hole on the bottom surface 903 of the cylinder 9.
By means of the cylinder connection holes, the connection plate 1001 can be fixed to the cylinder skirt 901 in the cylinder 9 via bolts, and the support plate 1002 can be fixed to the diaphragms 902 in the cylinder 9.
In this embodiment, the crankshaft pressure plates 11 are disposed corresponding to the support plates 1002 one by one, and may be detachably connected to the support plates 1002 in the tooling bottom plate 10 through connecting bolts, and correspond to the two sections of the support plates 1002, and each crankshaft pressure plate 11 is also connected to two sections of the corresponding support plate 1002. In addition, in this embodiment, each crankshaft pressing plate 11 is also provided with an upper crankshaft mounting groove that is fastened to a corresponding lower crankshaft mounting groove on the supporting plate 1002, and along with the connection of the crankshaft pressing plates 11, the upper and lower crankshaft mounting grooves are fastened to form a complete mounting hole structure, which can also realize the installation and pressing fixation of the crankshaft 3.
In this embodiment, the adjusting link positioning mechanism is specifically disposed on the tooling bottom plate 10, and the adjusting link positioning mechanism has positioning pin insertion holes respectively disposed on two sides of the crankshaft pressing plate 11, and a plurality of adjusting link positioning pins 14 that are disposed in the positioning pin insertion holes in a pluggable manner. Meanwhile, it should be noted that at least one adjusting link positioning pin 14 is disposed between each two adjacent supporting plates 1002.
In practical implementation, the above positioning pin insertion holes may be directly formed in the supporting plate 1002, but as a preferred embodiment, the positioning blocks 13 are specifically fixed on the tool bottom plate 10 at two sides of the crankshaft pressing plate 11, and the positioning pin insertion holes are formed in the positioning blocks 13. At this time, the positioning block 13 may be fixed on the supporting plate 1002 for press-fitting and disposed adjacent to an end of the crankshaft pressing plate 11, and by employing the positioning block 13, it is possible to obtain positioning pin insertion holes having different apertures by replacing the positioning block 13, thereby satisfying various demands.
In this embodiment, it should be noted that the tool is designed to match a four-cylinder engine, and the number of the support plates 1002 in the tool bottom plate 10 is five, which are arranged side by side. At this time, in order to save the number of the positioning blocks 13 and the adjusting link positioning pins 14, as a preferred embodiment, an arrangement situation of the adjusting link positioning pins 14 in the adjusting link positioning mechanism of the present embodiment may be as shown in fig. 5.
At this time, the positioning block 13 is provided only on the support plates 1002 of the second and fourth rows, and by arranging the adjustment link positioning pins 14 as in fig. 5, it is also satisfactory to have one adjustment link positioning pin 14 between each adjacent support plate 1002. Meanwhile, by plugging and unplugging the adjusting link positioning pin 14, the adjusting link positioning pin 14 in fig. 5 is unplugged and then the position is changed, so that the adjusting link 5 can be positioned in two screwing processes in the third embodiment.
In this embodiment, the crankshaft pressure strip 12 at least one end is further provided with two crankshaft angle positioning holes 12, and the two crankshaft angle positioning holes 12 are respectively disposed on two sides of the upper crankshaft mounting groove. The crank angle positioning hole 12 may be used to position the angle of the crankshaft 3 after the crankshaft 3 is mounted, but it should be noted that the crank angle positioning hole 12 may be provided in the end support plate 1002 instead of the crank angle positioning hole 12 provided in the crank pressing plate 12.
For specific use of the tool of this embodiment, reference may be made to the description in the following third embodiment.
EXAMPLE III
The present embodiment relates to a fastening method of a connecting rod bolt in an adjusting connecting rod 5, wherein the fastening method is specifically based on the tool in the second embodiment, in this case, the engine applied to the multi-connecting rod type variable compression ratio mechanism with the adjusting connecting rod 5 is four cylinders, and the fastening method of the present embodiment also specifically includes the following steps:
first, as shown in fig. 6, the piston 1, the control link 2, and the upper link holder 501 in the adjusting link 5 in the multi-link type variable compression ratio mechanism are assembled in advance. Then, the piston 1 is pushed into the cylinder of the cylinder 9. Next, as shown in fig. 7, the cylinder block 9 is inverted, the upper rod rest 501 is exposed from the cylinder hole of the cylinder block 9, and the upper rod rest 501 can be positioned on the non-piston cooling nozzle mounting side in the cylinder block 9, and then, the tooling bottom plate 10 can be provided on the bottom surface 903 of the cylinder block 9.
Next, as shown in fig. 8, the crankshaft 3 is placed in the lower crankshaft mounting groove of the tool bottom plate 10, and the rotation angle of the crankshaft 3 is positioned so that the axis of each connecting rod journal 301 on the crankshaft 3 is parallel to the bottom surface 903 of the cylinder block 9. At this time, regarding the positioning of the rotation angle of the crankshaft 3, as an exemplary manner, in the present embodiment, as shown in fig. 9, a flange portion 302 is provided on the crankshaft 3 at one end thereof, and the flange portion 302 is also provided with a plurality of threaded holes 303 arranged at intervals in a ring shape.
Therefore, the crankshaft pressing plate 11 with the crankshaft angle positioning holes 12 can be firstly preliminarily fixed on the tool bottom plate 10, and then the crankshaft angle positioning pins 15 which are screwed in the threaded holes 303 and inserted into one of the two crankshaft angle positioning holes 12 can be adopted through reasonable arrangement of the threaded holes 303 and the two crankshaft angle positioning holes 12 on the crankshaft pressing plate 11, so that the angle positioning of the crankshaft 3 is realized.
Of course, in addition to the above crankshaft angle positioning pin 15 for positioning the angle, the present embodiment may also adopt other manners to position the angle of the crankshaft 3, for example, a through hole structure may be provided at the end of the crankshaft 3, and an external conical abutting member pushed laterally is adopted, so as to achieve the purpose of positioning the angle of the crankshaft 3 by abutting the crankshaft.
In this embodiment, the fastening method further includes after the crankshaft 3 is positioned at the corner, pressing the crankshaft 3 by each crankshaft pressing plate 11, adjusting the upper connecting seat 501 to the corresponding connecting rod journal 301, fastening the lower connecting seat 502 connected with the actuating connecting rod 7 with the upper connecting seat 501, and pre-tightening the upper and lower connecting seats by using the control connecting rod side connecting rod bolt 506 and the actuating connecting rod side connecting rod bolt 507.
After the pre-tightening, the tightening of the two link bolts can be performed, and at this time, the adjusting link 5 is positioned by the adjusting link positioning pin 14 so that the axis of one of the control link-side link bolt 506 and the actuating link-side link bolt 507 is parallel to the bottom surface 903, and the control link-side link bolt 506 or the actuating link-side link bolt 507 parallel to the bottom surface 903 can be tightened using the tightening tool 16 as shown in fig. 10.
Then, the pressed crankshaft 3 is released, and the crankshaft 3 is rotated by 180 °, and then the rotation angle of the crankshaft 3 is positioned again by the same method as described above, so that the axis of each connecting rod journal 301 on the crankshaft 3 is also parallel to the bottom surface 903 of the cylinder block 9, and the crankshaft 3 is pressed again. Then, after the position of each adjustment link positioning pin 14 is changed, the adjustment link 5 is positioned by the adjustment link positioning pin 14 such that the other axis of the control link-side link bolt 506 and the actuator link-side link bolt 507 is parallel to the bottom surface 903. Finally, the control link-side link bolt 506 or the actuator link-side link bolt 507 parallel to the bottom surface 903 may be tightened again by using the tightening tool 16.
After the two connecting rod bolts are screwed down, the tool can be disassembled, and the assembly of other parts in the variable compression ratio mechanism is continuously carried out.
It should be noted that, in the fastening method of the present embodiment, when the connecting rod bolt is pre-tightened, since the actuating connecting rod 7 needs to be rotated to obtain the tightening operation space of the connecting rod bolt, in the variable compression ratio mechanism of the present embodiment, since the control-connecting-rod-side connecting rod bolt 506 is closer to the control connecting rod 2, if the control-connecting-rod-side connecting rod bolt 506 is pre-tightened first, the rotatable angle of the actuating connecting rod 7 is reduced compared to that of the actuating-connecting-rod-side connecting rod bolt 507, and the operation space of the other connecting rod bolt is reduced.
Therefore, when the control link-side link bolt 506 and the implement link-side link bolt 507 are pre-tightened, the present embodiment may preferably pre-tighten the implement link-side link bolt 507 first and then pre-tighten the control link-side link bolt 506. However, when the two link bolts are tightened, since the control-link-side link bolt 506 is finally pre-tightened while it is nearly horizontal, that is, nearly parallel to the bottom surface 903 of the cylinder 9, it is preferable to first tighten the control-link-side link bolt 506 and then tighten the actuator-link-side link bolt 507.
In addition, after the first tightening, the adjusting connecting rod positioning pin 14 and the crankshaft angle positioning pin 15 are removed, and the posture of the actuating connecting rod 7 is generally adjusted once so that the head of the connecting rod bolt faces downwards, so that the risk that the piston 1 protrudes out of the cylinder hole and the piston 1 is scratched when the crankshaft 3 is subsequently rotated can be avoided.
The fastening method of the embodiment can realize the fastening of two connecting rod bolts on the adjusting connecting rod 5, and the fastening efficiency of the connecting rod bolts of the adjusting connecting rod 5 can be improved only by adjusting the positions of the crankshaft and the connecting rod once. Meanwhile, in the tightening process, the tightening heights of the two connecting rod bolts in the embodiment are basically the same, so that the interference between the tightening tool 16 and the tool can be well avoided, and the tightening operation is facilitated.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an adjust connecting rod (5) for among multi-link formula variable compression ratio mechanism, just adjust connecting rod (5) including connecting rod seat (501) and lower connecting rod seat (502), go up connecting rod seat (501) with the lock is formed with centre bore (503) between lower connecting rod seat (502), be equipped with control connecting rod hinge hole (504) on going up connecting rod seat (501), be equipped with on lower connecting rod seat (502) and carry out connecting rod hinge hole (505), the both sides of centre bore (503) are equipped with respectively and connect go up connecting rod seat (501) with the connecting rod bolt of lower connecting rod seat (502), its characterized in that: the mounting directions of the connecting rod bolts on the two sides are the same, the connecting rod bolts are respectively a control connecting rod side connecting rod bolt (506) close to the control connecting rod (2) and an execution connecting rod side connecting rod bolt (507) close to the execution connecting rod (7), the upper connecting rod seat (501) and the lower connecting rod seat (502) are connected to form a buckling surface (m) located between the upper connecting rod seat and the lower connecting rod seat, the buckling surface (m) passes through the center of the central hole (503), the axis of the execution connecting rod side connecting rod bolt (507) is perpendicular to the buckling surface (m), an included angle alpha is formed between the axis of the control connecting rod side connecting rod bolt (506) and the buckling surface (m), and the included angle alpha is more than or equal to 70 degrees and less than 90 degrees.
2. The adjusting link of claim 1, wherein: and a concave-convex structure meshed with the buckling surface (m) is arranged between the upper connecting rod seat (501) and the lower connecting rod seat (502).
3. A tool for fastening a connecting rod bolt in an adjusting connecting rod according to claim 1 or 2, which is characterized in that: the frock includes:
the tool bottom plate (10) at least comprises a plurality of support plates (1002) which are arranged side by side, and a lower crankshaft mounting groove is formed in each support plate (1002);
the crankshaft pressing plates (11) are arranged in one-to-one correspondence with the supporting plates (1002), each crankshaft pressing plate (11) is detachably fixed on the corresponding supporting plate (1002), and each crankshaft pressing plate (11) is provided with an upper crankshaft mounting groove buckled with the lower crankshaft mounting groove on the corresponding supporting plate (1002);
the adjusting connecting rod positioning mechanism is arranged on the tool bottom plate (10) and is provided with positioning pin insertion holes which are respectively formed in two sides of the crankshaft pressing plate (11) and a plurality of adjusting connecting rod positioning pins (14) which are arranged in the positioning pin insertion holes in a pluggable mode, and at least one adjusting connecting rod positioning pin (14) is arranged between every two adjacent supporting plates (1002).
4. The tooling of claim 3, wherein: each supporting plate (1002) is broken at the lower crankshaft mounting groove and provided with two sections which are respectively arranged at two sides, the tool bottom plate (10) is further provided with connecting plates (1001) which are respectively connected with the supporting plates (1002) at the sections at the same side, and the crankshaft pressing plate (11) is respectively connected with the two sections corresponding to the supporting plates (1002).
5. The adjusting link of claim 3, wherein: and a cylinder body connecting hole is formed in the tool bottom plate (10).
6. The adjusting link of claim 3, wherein: and positioning blocks (13) are fixed on the tool bottom plate (10) on two sides of the crankshaft pressing plate (11), and the positioning pin insertion holes are formed in the positioning blocks (13).
7. The adjusting link of claim 3, wherein: and the supporting plate (1002) and/or the crankshaft pressing plate (11) at least one end is/are provided with crankshaft corner positioning holes (12), and the two crankshaft corner positioning holes (12) are respectively arranged on two sides of the lower crankshaft mounting groove or the upper crankshaft mounting groove.
8. A fastening method of a connecting rod bolt in an adjusting connecting rod based on the tool as claimed in any one of claims 3 to 7, characterized by comprising the following steps:
pre-assembling a piston (1), a control connecting rod (2) and the upper connecting rod seat (501) in the adjusting connecting rod (5) in the multi-connecting rod type variable compression ratio mechanism, and pushing the piston (1) into a cylinder of a cylinder body (9);
inverting the cylinder body (9) to expose the upper connecting rod seat (501) out of a cylinder hole of the cylinder body (9), and arranging the tooling bottom plate (10) on the bottom surface (903) of the cylinder body (9);
placing a crankshaft (3) in the lower crankshaft mounting groove, and positioning the rotation angle of the crankshaft (3) so that the axis of each connecting rod journal (301) on the crankshaft (3) is parallel to the bottom surface (903) of the cylinder block (9);
the crankshaft (3) is pressed through the crankshaft pressing plate (11), the upper connecting seat (501) is adjusted to the position of the corresponding connecting rod journal (301), the lower connecting rod seat (502) connected with the execution connecting rod (7) is buckled with the upper connecting rod seat (501), and the control connecting rod side connecting rod bolt (506) and the execution connecting rod side connecting rod bolt (507) are used for pre-tightening;
positioning the adjusting link (5) by the adjusting link positioning pin (14) such that the axis of one of the control link-side link bolt (506) and the actuating link-side link bolt (507) is parallel to the bottom surface (903), and tightening the control link-side link bolt (506) or the actuating link-side link bolt (507) parallel to the bottom surface (903) using a tightening tool (16);
loosening the pressed crankshaft (3), rotating the crankshaft (3) by 180 degrees, positioning the rotation angle of the crankshaft (3) so that the axis of each connecting rod journal (301) on the crankshaft (3) is parallel to the bottom surface (903) of the cylinder block (9), and then pressing the crankshaft (3);
the adjusting link (5) is positioned by the adjusting link positioning pin (14) such that the other axis of the control link-side link bolt (506) and the actuating link-side link bolt (507) is parallel to the bottom surface (903), and the control link-side link bolt (506) or the actuating link-side link bolt (507) parallel to the bottom surface (903) is tightened using a tightening tool (16).
9. The fastening method according to claim 8, characterized in that: when the control-link-side link bolt (506) and the execution-link-side link bolt (507) are pre-tightened, the execution-link-side link bolt (507) is pre-tightened first, and when tightened, the control-link-side link bolt (506) is tightened first.
10. The fastening method according to claim 8, characterized in that: the crankshaft (3) is provided with a flange part (302) positioned at one end of the crankshaft, the flange part (302) is provided with a plurality of threaded holes (303) which are annularly arranged at intervals, and the crankshaft (3) is screwed in one of the threaded holes (303) and inserted into a crankshaft corner positioning pin (15) in one of the two crankshaft corner positioning holes (12) for carrying out corner positioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383352.5A CN113623067A (en) | 2020-05-08 | 2020-05-08 | Adjusting connecting rod, tool for fastening bolt in adjusting connecting rod and fastening method of tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383352.5A CN113623067A (en) | 2020-05-08 | 2020-05-08 | Adjusting connecting rod, tool for fastening bolt in adjusting connecting rod and fastening method of tool |
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| Publication Number | Publication Date |
|---|---|
| CN113623067A true CN113623067A (en) | 2021-11-09 |
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|---|---|---|---|
| CN202010383352.5A Pending CN113623067A (en) | 2020-05-08 | 2020-05-08 | Adjusting connecting rod, tool for fastening bolt in adjusting connecting rod and fastening method of tool |
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| CN (1) | CN113623067A (en) |
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| JP2007170453A (en) * | 2005-12-20 | 2007-07-05 | Nissan Motor Co Ltd | Lower link for piston crank mechanism of internal combustion engine |
| US20130112167A1 (en) * | 2011-05-03 | 2013-05-09 | Nicholas L. Norris | Connecting Rod For An Engine |
| JP2016070154A (en) * | 2014-09-30 | 2016-05-09 | 日産自動車株式会社 | Method of manufacturing internal combustion engine equipped with multiple-linkage piston-crank mechanism |
| CN108026836A (en) * | 2015-09-16 | 2018-05-11 | 日产自动车株式会社 | The bolt tightening method of lower link |
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2020
- 2020-05-08 CN CN202010383352.5A patent/CN113623067A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007170453A (en) * | 2005-12-20 | 2007-07-05 | Nissan Motor Co Ltd | Lower link for piston crank mechanism of internal combustion engine |
| US20130112167A1 (en) * | 2011-05-03 | 2013-05-09 | Nicholas L. Norris | Connecting Rod For An Engine |
| JP2016070154A (en) * | 2014-09-30 | 2016-05-09 | 日産自動車株式会社 | Method of manufacturing internal combustion engine equipped with multiple-linkage piston-crank mechanism |
| CN108026836A (en) * | 2015-09-16 | 2018-05-11 | 日产自动车株式会社 | The bolt tightening method of lower link |
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Application publication date: 20211109 |