CN212838929U - Assembled single cylinder engine crankshaft - Google Patents
Assembled single cylinder engine crankshaft Download PDFInfo
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- CN212838929U CN212838929U CN202021497829.4U CN202021497829U CN212838929U CN 212838929 U CN212838929 U CN 212838929U CN 202021497829 U CN202021497829 U CN 202021497829U CN 212838929 U CN212838929 U CN 212838929U
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Abstract
The utility model discloses an assembled single-cylinder engine crankshaft, which comprises a left crank and a right crank, wherein the left crank comprises a left crank handle part and a left crank rod part, and the right crank comprises a right crank handle part and a right crank rod part; an assembling pin column is arranged on the handle part of the right crank; an assembly pin hole matched with the assembly pin column is formed in the handle part of the left crank; a circumferential positioning structure and an axial limiting structure for preventing the assembling pin from being drawn out of the assembling pin hole are arranged between the assembling pin and the assembling pin hole; be equipped with lubricated oil piping system in the right crank, lubricated oil piping system includes central oilhole and sets up the oilhole in the assembly round pin post, and the oilhole runs through the both ends of right crank stalk portion, still is equipped with the intercommunication oilhole in the right crank, and the axis of intercommunication oilhole intersects perpendicularly with the axis of central oilhole and oilhole respectively, and the one end port of intercommunication oilhole is located on the periphery wall of right crank stalk portion, the other end extends central oilhole and oilhole respectively and communicates central oilhole and oilhole, is equipped with sealed end cap on the port of intercommunication oilhole.
Description
Technical Field
The utility model relates to a bent axle, specific be an assembled single cylinder engine bent axle.
Background
Fig. 1 is a schematic diagram of a conventional crankshaft. This bent axle includes left crank 1 and right crank 2, and left crank 1 includes left crank stalk portion 3 and left crank pole portion 4, and right crank 2 includes right crank stalk portion 5 and right crank stalk portion 6, corresponds between left crank stalk portion 3 and the right crank stalk portion 5 and is equipped with pinhole 7,8, and 9 interference fit of crank pin install two pinhole 7,8 in and connect as an organic wholely with left crank 1 and right crank 2. Although the existing crankshaft can meet the use requirement, after long-time use, the crank connecting rod 10 and the needle bearing 11 may be excessively worn due to wear and the like, but because the crank pin 9 and the two pin holes 7 and 8 are in interference fit, if the crank pin 9 needs to be disassembled, the left crank 1 or the right crank 2 needs to be disassembled from the crank pin 9 in a destructive mode, so that the pin holes 7 and 8 are easily deformed, and the requirement of interference fit between the newly replaced crank pin 9 and the pin holes 7 and 8 cannot be met any more.
In addition, the conventional lubricating oil path system in the crankshaft has a complicated problem, in which a central oil hole 12 is first provided in the right crank handle 6, a penetrating oil hole 13 is provided in the crank pin 9, a radial oil hole 14 for supplying lubricating oil to the needle bearing and a first inclined hole 15 connected to the central oil hole 12 are provided in a side wall of the oil hole 13, and a second inclined hole 16 for communicating the first inclined hole 15 with the central oil hole 12 is provided in the right crank handle 6. So many pore structure all need adopt the drilling process respectively to process, and the manufacturing procedure is complicated a great deal of, causes the cost to increase, and especially the processing of first inclined hole 15 and second inclined hole 16 needs the exclusive boring grab of independent design, has further increased the cost.
Disclosure of Invention
In view of this, the utility model aims at providing an assembled single cylinder engine crankshaft has the assembly more simple and convenient and can dismantle the advantage of maintaining, and can effectively simplify lubricated oil piping system, and it is more convenient to process.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an assembled single cylinder engine crankshaft comprises a left crank and a right crank, wherein the left crank comprises a left crank handle part and a left crank rod part, and the right crank comprises a right crank handle part and a right crank rod part;
an assembling pin column is arranged on the right crank handle part, and the assembling pin column and the right crank handle part are integrally arranged and are parallel to the right crank rod part; an assembly pin hole matched with the assembly pin column is formed in the left crank handle part, the assembly pin column is detachably assembled in the assembly pin hole, and a crank connecting rod positioned between the left crank handle part and the right crank handle part is sleeved on the assembly pin column; a circumferential positioning structure and an axial limiting structure for preventing the assembling pin from being drawn out of the assembling pin hole are arranged between the assembling pin and the assembling pin hole;
a lubricating oil path system is arranged in the right crank, the lubricating oil path system comprises a central oil hole arranged in the right crank rod part and oil holes arranged in the assembling pin columns, the oil holes penetrate through two ends of the right crank handle part, a communicating oil hole is also arranged in the right crank, the axis of the communicating oil hole is respectively and vertically intersected with the axis of the central oil hole and the axis of the oil hole, a port at one end of the communicating oil hole is positioned on the outer peripheral wall of the right crank handle part, the other end of the communicating oil hole respectively extends through the central oil hole and the oil hole and is communicated with the central oil hole and the oil hole, and a sealing plug is arranged at a port of the communicating oil hole; and a radial oil hole is formed in the side wall of the oil hole, and an oil outlet of the radial oil hole is positioned on the outer peripheral wall of the assembling pin column and between the left crank handle part and the right crank handle part.
Further, the assembling pin column comprises a large-diameter section and a small-diameter section which are coaxially arranged, the outer diameter of the large-diameter section is larger than that of the small-diameter section, the assembling pin hole is matched with the small-diameter section, and the crank connecting rod is sleeved on the large-diameter section; and a needle bearing is arranged between the crank connecting rod and the large-diameter section, the axial length of the needle bearing is greater than or equal to that of the large-diameter section, and two ends of the needle bearing are respectively in limit fit with the left crank handle part and the right crank handle part.
Furthermore, an oil groove surrounding a circle is formed in the outer peripheral wall of the assembling pin column, and the port of the radial oil hole is located in the oil groove; and the radial symmetrical surface of the oil groove is superposed with the radial symmetrical surface of the needle bearing.
Further, circumference location structure is including setting up on the assembly pin hole inner wall and along the constant head tank that its generating line direction extends with set up and be in on the minor diameter section periphery wall with constant head tank complex locating piece.
Furthermore, the axial limiting structure comprises a radial hole which is arranged in the handle part of the left crank and is vertical to the axis of the assembling pin hole, a radial limiting hole is correspondingly arranged on the assembling pin column and corresponds to the radial hole, and a limiting element which is in limiting fit with the radial limiting hole is arranged in the radial hole.
Further, the radial hole comprises a radial large-diameter section and a radial small-diameter section which are coaxially arranged, the radial large-diameter section is positioned on one side of the radial small-diameter section which is radially outward, the inner diameter of the radial large-diameter section is larger than that of the radial small-diameter section, and the inner diameter of the radial limiting hole is equal to that of the radial small-diameter section; the radial large-diameter section is internally provided with internal threads, the limiting element comprises a thread section in threaded fit with the radial large-diameter section and a smooth section in fit with the radial small-diameter section, and the smooth section extends into the radial limiting hole to be in limit fit with the assembling pin column.
Furthermore, a counter bore is formed in the radially outward end of the radial large-diameter section, and a limiting head located in the counter bore is arranged at the end, back to the smooth section, of the thread section.
Furthermore, the left crank handle part and the left crank rod part are arranged in a split manner, and one end of the left crank rod part facing the left crank handle part is sleeved with a timing gear which rotates synchronously with the left crank rod part; the left crank handle part faces one side of the left crank rod part and is provided with a jack, and a plug matched with the jack is arranged on the left crank rod part.
Furthermore, an internal spline is arranged in the jack, and an external spline meshed with the internal spline is arranged on the plug.
Further, left crank pole portion includes pole portion major diameter section and is located pole portion major diameter section faces the pole portion minor diameter section of the one end of left crank stalk portion, the external diameter of pole portion minor diameter section is less than the external diameter of pole portion major diameter section and form the shaft shoulder between pole portion major diameter section and the pole portion minor diameter section, the timing gear suit is in on the pole portion minor diameter section and fixed the shaft shoulder with between the left crank stalk portion.
The beneficial effects of the utility model reside in that:
the utility model discloses an assembled single cylinder engine crankshaft, through on the shank of right crank rather than integrative setting up the assembly round pin post, and with assembly round pin post direct with assembly pinhole cooperation, utilize the circumference location structure to realize the circumference location between assembly round pin post and the assembly pinhole, and then realize the circumference location of left crank and right crank, and utilize axial limit structure to prevent that the assembly round pin post from being taken out by the axial force in the assembly pinhole, so, can satisfy the assembly and the operation requirement of bent axle, and after long-time use, if crank connecting rod and bearing need to be changed when maintaining, can take apart left crank and right crank harmlessly and realize changing the maintenance;
through will assembling the round pin axle and set up on right crank stalk portion, so, can all set up in right crank lubricating oil piping system, make central oilhole and oilhole link to each other through setting up the intercommunication oilhole to the axis that makes the intercommunication oilhole intersects perpendicularly with the axis of central oilhole and oilhole, so, the intercommunication oilhole is vertical hole, for the mode that current adoption inclined hole made central oilhole and oilhole be linked together, the processing vertical hole need not design comparatively complicated special fixture, and processing is more convenient, and the cost is lower.
Current timing gear generally all installs on left crank rod portion through dedicated stamping equipment interference fit, the utility model discloses a set up left crank stalk portion and left crank rod portion components of a whole that can function independently, so, can directly install timing gear in left crank rod portion, and need not dedicated stamping equipment, the assembly is simple and convenient more.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the utility model provides a following figure explains:
FIG. 1 is a schematic structural view of a conventional crankshaft;
FIG. 2 is a schematic structural view of an embodiment of the assembled single cylinder engine crankshaft of the present invention;
FIG. 3 is a schematic structural view of the left crank;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a schematic structural view of the right crank;
FIG. 6 is a left side view of FIG. 5;
fig. 7 is a schematic structural view of the limiting element.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
As shown in FIG. 2, the structure of the crankshaft of the assembled single cylinder engine according to the present invention is schematically illustrated. The assembled single cylinder engine crankshaft of this embodiment, including left crank 1 and right crank 2, left crank 1 includes left crank stalk portion 3 and left crank pole portion 4, and right crank 2 includes right crank stalk portion 5 and right crank pole portion 6. The right crank handle part 5 of the embodiment is provided with an assembling pin 17, and the assembling pin 17 is integrally arranged with the right crank handle part 5 and is parallel to the right crank rod part 6; an assembly pin hole 18 matched with an assembly pin 17 is formed in the left crank handle part 3, the assembly pin 17 is detachably assembled in the assembly pin hole 18, and a crank connecting rod 10 positioned between the left crank handle part 3 and the right crank handle part 5 is sleeved on the assembly pin 17; and a circumferential positioning structure and an axial limiting structure for preventing the assembling pin 17 from being drawn out of the assembling pin hole 18 are arranged between the assembling pin 17 and the assembling pin hole 18.
A lubricating oil path system is arranged in the right crank 2 of the embodiment, the lubricating oil path system comprises a central oil hole 12 arranged in the right crank rod part 6 and oil holes 13 arranged in the assembling pins 17, the oil holes 13 penetrate through two ends of the right crank handle part 5, a communicating oil hole 19 is also arranged in the right crank 2, the axis of the communicating oil hole 19 is respectively and vertically intersected with the axes of the central oil hole 12 and the oil holes 13, one end port of the communicating oil hole 19 is positioned on the outer peripheral wall of the right crank handle part 5, the other end of the communicating oil hole 19 respectively extends through the central oil hole 12 and the oil holes 13 and is communicated with the central oil hole 12 and the oil holes 13, and a sealing; the side wall of the oil hole 13 is provided with a radial oil hole 14, and the oil outlet of the radial oil hole 14 is positioned on the outer peripheral wall of the assembling pin 17 and between the left crank handle part 3 and the right crank handle part 5.
Further, the assembly pin 17 of the present embodiment includes a large diameter section 17a and a small diameter section 17b that are coaxially disposed, an outer diameter of the large diameter section 17a is larger than an outer diameter of the small diameter section 17b, the assembly pin hole 18 is matched with the small diameter section 17b, and the crank connecting rod 10 is sleeved on the large diameter section 17 a. Specifically, a needle bearing 11 is arranged between the crank connecting rod 10 and the large-diameter section 17a, the axial length of the needle bearing 11 is greater than or equal to that of the large-diameter section 17a, and two ends of the needle bearing 11 are respectively in limit fit with the left crank handle part 3 and the right crank handle part 5. The circumferential positioning structure of the present embodiment includes a positioning groove 20 provided on the inner wall of the fitting pin hole 18 and extending in the generatrix direction thereof, and a positioning block 21 provided on the outer peripheral wall of the small-diameter section 17b to be fitted with the positioning groove 20. Through the positioning matching structure of the positioning groove 20 and the positioning block 21, circumferential positioning between the assembling pin hole 18 and the assembling pin column 17 can be realized, and the assembling precision requirement in the set circumferential direction between the left crank and the right crank is met. Of course, in some embodiments, the positioning groove 20 may be provided in plural, and similarly, the positioning block 21 may also be provided in plural, which has the same principle and will not be described again.
Further, the outer peripheral wall of the assembling pin 17 of the present embodiment is provided with an oil groove 25 surrounding one circle, the port of the radial oil hole 14 is located in the oil groove 25, the radial symmetry plane of the oil groove 25 of the present embodiment coincides with the radial symmetry plane of the needle bearing 11, that is, the oil groove 25 is located in the middle of the needle bearing 11. Through setting up oil groove 25, can evenly enter into bearing 11 by circumference direction lubricating oil, improve lubricated effect.
Further, the axial limiting structure comprises a radial hole 22 which is arranged in the left crank handle part 3 and is perpendicular to the axis of the assembling pin hole 18, a radial limiting hole 23 is arranged on the assembling pin 17 corresponding to the radial hole 22, and a limiting element 24 which is in limiting fit with the radial limiting hole 23 is arranged in the radial hole 22. The radial hole 22 of this embodiment includes a radial large diameter section 22a and a radial small diameter section 22b that are coaxially disposed, the radial large diameter section 22a is located on one side of the radial small diameter section 22b that is radially outward, the inner diameter of the radial large diameter section 22a is greater than the inner diameter of the radial small diameter section 22b, and the inner diameter of the radial limiting hole 23 is equal to the inner diameter of the radial small diameter section 22 b. Specifically, an internal thread is arranged in the radial large-diameter section 22a of the present embodiment, the limiting element 24 includes a threaded section 24a in threaded fit with the radial large-diameter section 22a and a smooth section 24b in threaded fit with the radial small-diameter section 22b, and the smooth section 24b extends into the radial limiting hole 23 to be in limiting fit with the assembling pin 17. Preferably, a counterbore 22c is formed at the end of the radial large-diameter section 22a facing radially outwards, and a limiting head 24c is formed at the end of the threaded section 24a facing away from the smooth section 24b and located in the counterbore 22 c. The technical purpose of axially limiting the assembling pin 17 and the assembling pin hole 18 can be realized by arranging the limiting element 24, and the limiting element 24 is in threaded fit with the radial large-diameter section 22a, so that the limiting element 24 can be conveniently detached, and the technical purpose of detaching the left crank 1 and the right crank 2 is realized.
Further, the left crank handle part 3 and the left crank rod part 4 are separately arranged, and one end of the left crank rod part 4 facing the left crank handle part 3 is sleeved with a timing gear 27 which rotates synchronously with the left crank rod part, and the timing gear 27 and the left crank rod part 3 of the present embodiment are connected by a key 32. The side of the left crank handle part 3 facing the left crank rod part is provided with a jack 28, and the left crank rod part 4 is provided with a plug 29 matched with the jack 28. Specifically, the insertion hole 28 of the present embodiment is provided with an internal spline, and the plug 29 is provided with an external spline engaged with the internal spline. The left crank shaft portion 4 of this embodiment includes the big footpath section of pole portion 30 and is located the pole portion path section 31 of the big footpath section of pole portion 30 one end towards left crank handle portion 3, and the external diameter of pole portion path section 31 is less than the external diameter of the big footpath section of pole portion 30 and forms the shaft shoulder between the big footpath section of pole portion 30 and the pole portion path section 31, and timing gear 27 suit is on the little footpath section of pole portion 31 and is fixed between shaft shoulder and left crank handle portion 3. Current timing gear generally all installs on left crank rod portion through dedicated stamping equipment interference fit, the utility model discloses a set up left crank stalk portion and left crank rod portion components of a whole that can function independently, so, can directly install timing gear in left crank rod portion, and need not dedicated stamping equipment, the assembly is simple and convenient more.
According to the assembled single-cylinder engine crankshaft, the right crank handle part is integrally provided with the assembling pin column, the assembling pin column is directly matched with the assembling pin hole, the circumferential positioning structure is used for realizing the circumferential positioning between the assembling pin column and the assembling pin hole, further the circumferential positioning of the left crank and the right crank is realized, and the axial limiting structure is used for preventing the assembling pin column from being drawn out from the assembling pin hole by axial force, so that the assembling and using requirements of the crankshaft can be met, and after the crankshaft; through will assembling the round pin axle and set up on right crank stalk portion, so, can all set up in right crank lubricating oil piping system, make central oilhole and oilhole link to each other through setting up the intercommunication oilhole to the axis that makes the intercommunication oilhole intersects perpendicularly with the axis of central oilhole and oilhole, so, the intercommunication oilhole is vertical hole, for the mode that current adoption inclined hole made central oilhole and oilhole be linked together, the processing vertical hole need not design comparatively complicated special fixture, and processing is more convenient, and the cost is lower.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (10)
1. The utility model provides an assembled single cylinder engine crankshaft, includes left crank (1) and right crank (2), left crank (1) includes left crank stalk portion (3) and left crank pole portion (4), right crank (2) include right crank stalk portion (5) and right crank pole portion (6), its characterized in that:
an assembling pin (17) is arranged on the right crank handle part (5), and the assembling pin (17) and the right crank handle part (5) are integrally arranged and are parallel to the right crank rod part (6); an assembly pin hole (18) matched with the assembly pin column (17) is formed in the left crank handle part (3), the assembly pin column (17) is detachably assembled in the assembly pin hole (18), and a crank connecting rod (10) positioned between the left crank handle part (3) and the right crank handle part (5) is sleeved on the assembly pin column (17); a circumferential positioning structure and an axial limiting structure for preventing the assembling pin (17) from being drawn out of the assembling pin hole (18) are arranged between the assembling pin (17) and the assembling pin hole (18);
a lubricating oil path system is arranged in the right crank (2), the lubricating oil path system comprises a central oil hole (12) arranged in the right crank rod part (6) and oil holes (13) arranged in the assembling pins (17), the oil holes (13) penetrate through two ends of the right crank handle part (5), a communicating oil hole (19) is further arranged in the right crank (2), the axis of the communicating oil hole (19) is respectively and vertically intersected with the axes of the central oil hole (12) and the oil holes (13), one end port of the communicating oil hole (19) is positioned on the outer peripheral wall of the right crank handle part (5), the other end of the communicating oil hole respectively penetrates through the central oil hole (12) and the oil holes (13) and is communicated with the central oil hole (12) and the oil holes (13), and a sealing plug (26) is arranged on the end port of the communicating oil hole; and a radial oil hole (14) is formed in the side wall of the oil hole (13), and an oil outlet of the radial oil hole (14) is formed in the outer peripheral wall of the assembling pin column (17) and is formed between the left crank handle part (3) and the right crank handle part (5).
2. The fabricated single cylinder engine crankshaft of claim 1, wherein: the assembling pin column (17) comprises a large-diameter section (17 a) and a small-diameter section (17 b) which are coaxially arranged, the outer diameter of the large-diameter section (17 a) is larger than that of the small-diameter section (17 b), the assembling pin hole (18) is matched with the small-diameter section (17 b), and the crank connecting rod (10) is sleeved on the large-diameter section (17 a); a needle bearing (11) is arranged between the crank connecting rod (10) and the large-diameter section (17 a), the axial length of the needle bearing (11) is greater than or equal to that of the large-diameter section (17 a), and two ends of the needle bearing (11) are respectively in limit fit with the left crank handle part (3) and the right crank handle part (5).
3. The fabricated single cylinder engine crankshaft of claim 2, wherein: an oil groove (25) surrounding a circle is formed in the outer peripheral wall of the assembling pin column (17), and the port of the radial oil hole (14) is located in the oil groove (25); the radial symmetry plane of the oil groove (25) coincides with the radial symmetry plane of the needle bearing (11).
4. The fabricated single cylinder engine crankshaft of claim 2 or 3, wherein: the circumferential positioning structure comprises a positioning groove (20) which is arranged on the inner wall of the assembling pin hole (18) and extends along the generatrix direction of the assembling pin hole, and a positioning block (21) which is arranged on the outer peripheral wall of the small-diameter section (17 b) and matched with the positioning groove (20).
5. The fabricated single cylinder engine crankshaft of claim 1, wherein: the axial limiting structure comprises a radial hole (22) which is arranged in the left crank handle part (3) and is vertical to the axis of the assembling pin hole (18), a radial limiting hole (23) is correspondingly arranged on the assembling pin column (17) and the radial hole (22), and a limiting element (24) which is in limiting fit with the radial limiting hole (23) is arranged in the radial hole (22).
6. The fabricated single cylinder engine crankshaft of claim 5, wherein: the radial hole (22) comprises a radial large-diameter section (22 a) and a radial small-diameter section (22 b) which are coaxially arranged, the radial large-diameter section (22 a) is positioned on one side of the radial small-diameter section (22 b) which is radially outward, the inner diameter of the radial large-diameter section (22 a) is larger than that of the radial small-diameter section (22 b), and the inner diameter of the radial limiting hole (23) is equal to that of the radial small-diameter section (22 b); the inner thread is arranged in the radial large-diameter section (22 a), the limiting element (24) comprises a thread section (24 a) in threaded fit with the radial large-diameter section (22 a) and a smooth section (24 b) in threaded fit with the radial small-diameter section (22 b), and the smooth section (24 b) extends into the radial limiting hole (23) to be in limiting fit with the assembling pin column (17).
7. The fabricated single cylinder engine crankshaft of claim 6, wherein: a counter bore (22 c) is formed in the radially outward end of the radial large-diameter section (22 a), and a limiting head (24 c) located in the counter bore (22 c) is arranged at the end, facing away from the smooth section (24 b), of the threaded section (24 a).
8. The fabricated single cylinder engine crankshaft of claim 1, wherein: the left crank handle part (3) and the left crank rod part (4) are arranged in a split mode, and a timing gear (27) rotating synchronously with the left crank handle part is sleeved on one end, facing the left crank handle part (3), of the left crank rod part (4); left side crank stalk portion (3) face one side of left side crank pole portion is equipped with jack (28), be equipped with on left side crank pole portion (4) with jack (28) complex plug (29).
9. The fabricated single cylinder engine crankshaft of claim 8, wherein: an internal spline is arranged in the jack (28), and an external spline meshed with the internal spline is arranged on the plug (29).
10. The fabricated single cylinder engine crankshaft of claim 9, wherein: left crank pole portion (4) include pole portion major diameter section (30) and be located pole portion major diameter section (30) face pole portion minor diameter section (31) of the one end of left crank stalk portion (3), the external diameter of pole portion minor diameter section (31) is less than the external diameter of pole portion major diameter section (30) and form the shaft shoulder between pole portion major diameter section (30) and pole portion minor diameter section (31), timing gear (27) suit is in on pole portion minor diameter section (31) and fixed the shaft shoulder with between left crank stalk portion (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021497829.4U CN212838929U (en) | 2020-07-24 | 2020-07-24 | Assembled single cylinder engine crankshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021497829.4U CN212838929U (en) | 2020-07-24 | 2020-07-24 | Assembled single cylinder engine crankshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212838929U true CN212838929U (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021497829.4U Active CN212838929U (en) | 2020-07-24 | 2020-07-24 | Assembled single cylinder engine crankshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212838929U (en) |
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2020
- 2020-07-24 CN CN202021497829.4U patent/CN212838929U/en active Active
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