CN216642384U - Single-cylinder engine crankshaft of motorcycle - Google Patents
Single-cylinder engine crankshaft of motorcycle Download PDFInfo
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- CN216642384U CN216642384U CN202123383504.0U CN202123383504U CN216642384U CN 216642384 U CN216642384 U CN 216642384U CN 202123383504 U CN202123383504 U CN 202123383504U CN 216642384 U CN216642384 U CN 216642384U
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Abstract
The utility model discloses a single-cylinder engine crankshaft of a motorcycle, 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; the right crank handle part is provided with an assembling pin column, 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 mechanism and an axial limiting mechanism 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; the assembling pin column comprises a large-diameter section and a small-diameter section which are coaxially arranged, and a needle bearing is arranged between the crank connecting rod and the large-diameter section; a lubricating oil path system is arranged in the right crank, and radial oil holes are uniformly distributed in the oil holes in an annular mode, so that the oil lubrication effect on the needle roller bearing can be improved.
Description
Technical Field
The utility model relates to the technical field of motorcycle crankshafts, in particular to a crankshaft of a single-cylinder engine of a motorcycle.
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 the existing crank, left crank 1 and right crank 2 all adopt the integral type structure, and left crank stalk portion 3 and left crank pole portion 4 set up as an organic whole promptly, and right crank stalk portion 5 and right crank pole portion 6 set up as an organic whole. Although the existing crank can meet the use requirements, the following defects still exist: 1) the timing gear 12 is arranged on the left crank rod part 4 in an interference fit manner, special press-fitting equipment is needed, and the assembly is difficult; 2) a transmission gear 13 integrally formed with the right crank rod part 6 is arranged on the right crank rod part, and the transmission gear 13 is processed by a special broaching machine due to the fact that the right crank is of a special-shaped structure; 3) drilling holes are needed in the crank rod part 4 and the right crank rod part 6, and due to the interference of the left crank handle part 3 and the right crank handle part 5, a universal shaft part drilling device cannot be adopted, and a special clamp needs to be designed.
The existing lubricating oil path system in the crankshaft has the problem of complexity, firstly, a central oil hole 12 needs to be arranged in the right crank handle part 6, a through communication hole 13 needs to be arranged in the crank pin 9, a radial oil hole 14 used for providing lubricating oil for a needle bearing and a first inclined hole 15 used for being connected with the central oil hole 12 need to be arranged on the side wall of the communication hole 13, and a second inclined hole 16 used for communicating the first inclined hole 15 with the central oil hole 14 is arranged in the right crank handle part 6. So many pore structure all need adopt the drilling process respectively to process, and the manufacturing procedure is complicated a lot 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, and at motorcycle operation in-process, current lubricated mode can't play the lubrication action to bearing at any time, and bearing's lubricated effect of oil is poor, leads to its life weak point, needs often to change.
Disclosure of Invention
In view of the above, the present invention provides a crankshaft of a single cylinder engine for a motorcycle, which can optimize the oil lubrication effect on a needle bearing.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a crankshaft of a single-cylinder engine of a motorcycle, 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 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 mechanism and an axial limiting mechanism 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;
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; 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;
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 a lubricating oil hole arranged in the assembling pin post, the lubricating oil hole penetrates 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 lubricating oil hole, one end port 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 lubricating oil hole and is communicated with the central oil hole and the lubricating oil hole, and a sealing plug is arranged on the end port of the communicating oil hole; first radial oil holes are uniformly distributed in the side wall of the lubricating oil hole, and oil outlets of the first radial oil holes are located in the needle roller bearing.
Further, the axis of the first radial oil hole is located on a radial symmetric plane of the needle bearing.
Furthermore, a second radial oil hole and a third radial oil hole which are uniformly distributed on the side wall of the lubricating oil hole are symmetrically arranged on two sides of the first radial oil hole.
Furthermore, be equipped with on the periphery wall of assembly cotter with three of first radial oilhole, the radial oilhole of second and the radial oilhole one-to-one of third encircle the oil groove of a week, the oil outlet port of first radial oilhole, the radial oilhole of second and the radial oilhole of third is located in the oil groove.
Further, circumference positioning mechanism 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 mechanism 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 integrated, and the left crank rod part is provided with a timing gear integrated with the left crank handle part.
The utility model has the beneficial effects that:
according to the assembled single-cylinder engine crankshaft, the assembling pin column is integrally arranged on the right crank handle part, the assembling pin column is directly matched with the assembling pin hole, the circumferential positioning between the assembling pin column and the assembling pin hole is realized by using the circumferential positioning mechanism, the circumferential positioning of the left crank and the right crank is further realized, and the axial limiting mechanism is used for preventing the assembling pin column from being drawn out by axial force from the assembling pin hole, so that the assembling and using requirements of the crankshaft can be met, and after the crankshaft, if need to be nondestructively, if need to change maintenance, if need to implement replacement maintenance, it can nondestructively, it can nondestr;
the assembling pin shaft is arranged on the handle part of the right crank, so that the lubricating oil path system can be completely arranged in the right crank, the central oil hole is connected with the oil hole by arranging the communicating oil hole, and the axis of the communicating oil hole is vertically intersected with the axis of the central oil hole and the axis of the oil hole;
the existing timing gear is generally arranged on the left crank rod part in an interference fit mode through special stamping equipment, and the left crank rod part and the timing gear are integrally arranged (in a gear shaft mode), so that the structure of the device can be improved, the special stamping equipment is not needed, and the assembly is simpler and more convenient.
Drawings
In order to make the object, technical scheme and beneficial effect of the utility model more clear, the utility model provides the following drawings for explanation:
FIG. 1 is a schematic structural view of a conventional crankshaft;
FIG. 2 is a cross-sectional view of an embodiment of a crankshaft of the motorcycle single cylinder engine of the present invention;
FIG. 3 is a cross-sectional view of the left crank;
FIG. 4 is a right side view of FIG. 3
FIG. 5 is a cross-sectional view of the right crank;
FIG. 6 is a left side view of FIG. 5;
fig. 7 is a mechanism schematic view of the limiting element.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
FIG. 2 is a sectional view of a single cylinder engine crankshaft embodiment of a motorcycle of the present invention. The crankshaft of the single-cylinder engine of the motorcycle comprises a left crank 1 and a right crank 2, wherein the left crank 1 comprises a left crank handle part 3 and a left crank rod part 4, and the right crank 2 comprises a right crank handle part 5 and a right crank rod part 6;
referring to fig. 2 and 5, the right crank handle portion 5 of the present embodiment is provided with a mounting pin 17, and the mounting pin 17 is integrally provided with the right crank handle portion 5 and is parallel to the right crank shaft portion 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; a circumferential positioning mechanism and an axial limiting mechanism 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;
specifically, as shown in fig. 2 and 5, the assembly pin 17 of the present embodiment includes a large diameter section 17a and a small diameter section 17b which are coaxially arranged, the outer diameter of the large diameter section 17a is larger than that of the small diameter section 17b, the assembly pin hole 18 is matched with the small diameter section 17b, and the crank link 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 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;
as shown in fig. 2, 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 a lubricating oil hole 13 arranged in the assembling pin 17, the lubricating oil hole 13 penetrates through two ends of the right crank handle part 5, a communicating oil hole 19 is also arranged in the right crank 2, the axes of the communicating oil hole 19 are respectively and vertically intersected with the axes of the central oil hole 12 and the lubricating oil hole 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 lubricating oil hole 13 and is communicated with the central oil hole 12 and the lubricating oil hole 13, and a sealing plug 26 is arranged on the end port of the communicating oil hole 19; first radial oil holes 14a are uniformly distributed on the side wall of the lubricating oil hole 13, in order to make the lubricating effect in the needle bearing 11 more uniform, in this embodiment, the axis of the first radial oil hole 14a is arranged on the radial symmetric surface of the needle bearing 11, two sides of the first radial oil hole 14a along the length direction of the needle in the needle bearing 11 are respectively provided with a second radial oil hole 14b and a third radial oil hole 14c, the first radial oil hole 14a, and oil outlets of all the first radial oil hole 14a, the second radial oil hole 14b and the third radial oil hole 14c are all located in the needle bearing 11. In the motion process of the crankshaft, the first radial oil hole 14a, the second radial oil hole 14b and the third radial oil hole 14c which are uniformly distributed on the side wall of the lubricating oil hole 13 can introduce lubricating oil into the needle roller bearing 11 under the action of gravity, so that the lubricating effect on the needle roller bearing can be greatly improved, and the service life of the needle roller bearing is prolonged.
Further, the outer peripheral wall of the assembly pin 17 of the present embodiment is provided with three oil grooves 25 surrounding one circle, corresponding to the first radial oil hole 14a, the second radial oil hole 14b, and the third radial oil hole 14c one to one, and oil outlets of the first radial oil hole 14a, the second radial oil hole 14b, and the third radial oil hole 14c are located in the oil grooves 25, so that the oil lubrication effect on the needle roller bearing 11 can be improved.
Further, as shown in fig. 4, the circumferential positioning mechanism 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 the positioning block 21 may also be provided in plural correspondingly, and the principle is equivalent, and will not be described repeatedly.
Further, as shown in fig. 2 and 3, the axial limiting mechanism of the present embodiment includes a radial hole 22 disposed in the left crank handle 3 and perpendicular to the axis of the assembling pin hole 18, a radial limiting hole 23 is disposed on the assembling pin 17 corresponding to the radial hole 22, and a limiting element 24 disposed in the radial hole 22 and in limiting fit with the radial limiting hole 23. Specifically, an internal thread is provided in the radial large-diameter section 22a of the present embodiment, the limiting element 24 includes a threaded section 24a in threaded engagement with the radial large-diameter section 22a and a smooth section 24b in threaded engagement with the radial small-diameter section 22b, and the smooth section 24b extends into the radial limiting hole 23 to be in limiting engagement 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 arranged 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, as shown in fig. 3, the left crank handle 3 and the left crank rod 4 of the present embodiment are integrated, and the timing gear 27 is provided on the left crank rod 4, i.e. the timing gear 27 and the left crank rod 4 are integrated in the form of a gear shaft, so that the structure of the device can be improved, a special punching device is not required, and the assembly is simpler and more convenient.
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. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the utility model is all within the protection scope of the utility model. The protection scope of the utility model is subject to the claims.
Claims (9)
1. The utility model provides a motorcycle 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 mechanism and an axial limiting mechanism 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);
the assembling pin column (17) comprises a large-diameter section (17a) and a small-diameter section (17b) which are coaxially arranged, the outer diameter of the large-diameter section (17a) is larger than that of the small-diameter section (17b), the assembling 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); 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);
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 a lubricating oil hole (13) arranged in the assembling pin column (17), the lubricating oil hole (13) penetrates through the two ends of the right crank handle part (5), a communicating oil hole (19) is also arranged in the right crank (2), the axes of the communication oil hole (19) are respectively and vertically intersected with the axes of the central oil hole (12) and the lubricating oil hole (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 extends through the central oil hole (12) and the lubricating oil hole (13) and is communicated with the central oil hole (12) and the lubricating oil hole (13), and a sealing plug (26) is arranged at the end port of the communicating oil hole (19); first radial oil holes (14a) are uniformly distributed in the side wall of the lubricating oil hole (13), and oil outlets of the first radial oil holes (14a) are located in the needle roller bearing (11).
2. A single cylinder engine crankshaft for a motorcycle according to claim 1, wherein: the axis of the first radial oil hole (14a) is located on the radial symmetry plane of the needle bearing (11).
3. A single cylinder engine crankshaft for a motorcycle according to claim 2, wherein: and a second radial oil hole (14b) and a third radial oil hole (14c) which are uniformly distributed on the side wall of the lubricating oil hole (13) are symmetrically arranged on two sides of the first radial oil hole (14 a).
4. A single cylinder engine crankshaft for a motorcycle according to claim 3, wherein: the oil groove structure is characterized in that three oil grooves (25) which are in one-to-one correspondence with the first radial oil hole (14a), the second radial oil hole (14b) and the third radial oil hole (14c) and surround a circle are formed in the outer peripheral wall of the assembling pin column (17), and oil outlet ports of the first radial oil hole (14a), the second radial oil hole (14b) and the third radial oil hole (14c) are located in the oil grooves (25).
5. A single cylinder engine crankshaft for a motorcycle according to claim 1, wherein: the circumferential positioning mechanism 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 peripheral wall of the small-diameter section (17b) and matched with the positioning groove (20).
6. A single cylinder engine crankshaft for a motorcycle according to claim 1, wherein: the axial limiting mechanism 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).
7. A motorcycle single cylinder engine crankshaft as claimed in claim 6, wherein: the radial hole (22) comprises a radial large-diameter section (22a) and a radial small-diameter section (22b) which are coaxially arranged, the radial large-diameter section (22a) is positioned on one side of the radial small-diameter section (22b) which is radially outward, the inner diameter of the radial large-diameter section (22a) is larger than that of the radial small-diameter section (22b), 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 (22a), the limiting element (24) comprises a thread 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 column (17).
8. A single cylinder engine crankshaft for a motorcycle according to claim 7, wherein: a counter bore (22c) is formed in the radially outward end of the radial large-diameter section (22a), and a limiting head (24c) located in the counter bore (22c) is arranged at the end, facing away from the smooth section (24b), of the threaded section (24 a).
9. A single cylinder engine crankshaft for a motorcycle according to claim 1, wherein: the left crank handle part (3) and the left crank rod part (4) are integrated, and the left crank rod part (4) is provided with a timing gear (27) integrated with the left crank rod part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123383504.0U CN216642384U (en) | 2021-12-29 | 2021-12-29 | Single-cylinder engine crankshaft of motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123383504.0U CN216642384U (en) | 2021-12-29 | 2021-12-29 | Single-cylinder engine crankshaft of motorcycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216642384U true CN216642384U (en) | 2022-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123383504.0U Active CN216642384U (en) | 2021-12-29 | 2021-12-29 | Single-cylinder engine crankshaft of motorcycle |
Country Status (1)
| Country | Link |
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| CN (1) | CN216642384U (en) |
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2021
- 2021-12-29 CN CN202123383504.0U patent/CN216642384U/en active Active
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