CN212643294U

CN212643294U - Assembled motorcycle crankshaft

Info

Publication number: CN212643294U
Application number: CN202021491417.XU
Authority: CN
Inventors: 王胜学
Original assignee: Chongqing Boxian Machinery Co ltd
Current assignee: Chongqing Boxian Machinery Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-03-02
Anticipated expiration: 2030-07-24

Abstract

The utility model discloses an assembled motorcycle 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 assembly pin column is arranged on the left crank handle part, and the assembly pin column and the left crank handle part are integrally arranged and are parallel to each other; the handle part of the right crank is provided with an assembling pin hole matched with the assembling pin column; the assembling pin column is detachably assembled in the assembling pin hole, and a crank connecting rod positioned between the left crank handle part and the right crank handle part is sleeved on the assembling pin column; and 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. The utility model discloses an assembled motorcycle bent axle not only can satisfy the operation requirement, assembles more simple and conveniently moreover to have the advantage that can dismantle the maintenance.

Description

Assembled motorcycle crankshaft

Technical Field

The utility model relates to a bent axle, specific be an assembled motorcycle 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 the existing crankshaft is used for a long time, the crank connecting rod 10 and the needle bearing 13 are excessively worn due to the wear and the like, but the crank pin 9 and the two pin holes 7 and 8 are in interference fit, so that if the crank pin 9 needs to be disassembled, the left crank 1 or the right crank 2 needs to be violently taken down from the crank pin 9, the pin holes 7 and 8 are easily deformed, and the requirement of interference fit cannot be met between the newly replaced crank pin 9 and the pin holes 7 and 8.

Disclosure of Invention

In view of this, the utility model aims at providing an assembled motorcycle bent axle not only can satisfy the operation requirement, assembles more simple and conveniently moreover to have the advantage that can dismantle the maintenance.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an assembled motorcycle 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 assembly pin column is arranged on the left crank handle part, and the assembly pin column and the left crank handle part are integrally arranged and are parallel to the left crank rod part; the handle part of the right crank is provided with an assembling pin hole matched with the assembling pin column; the assembling pin column is detachably assembled in the assembling pin hole, and a crank connecting rod positioned between the left crank handle part and the right crank handle part is sleeved on the assembling pin column; and 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.

Further, the assembly 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 assembly pin hole is matched with the small-diameter section, and the crank connecting rod is sleeved on the large-diameter section.

Further, a needle bearing is arranged between the crank connecting rod and 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.

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 right 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 located on one side of the radial small-diameter section, 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.

Furthermore, an internal thread is arranged in the radial large-diameter section, the limiting element comprises a thread section in threaded fit with the radial large-diameter section and a smooth section in threaded fit with the radial small-diameter section, and the smooth section extends into the radial limiting hole to be in limiting 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.

The beneficial effects of the utility model reside in that:

the utility model discloses an assembled motorcycle crankshaft, through set up the assembly round pin post rather than an organic whole on left crank stalk portion, and with the 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 left crank and right articulate circumference location, and utilize axial limit structure to prevent that the assembly round pin post from being taken out by axial force in the assembly pinhole, so, can satisfy the assembly and the operation requirement of bent axle, and long-time the back of using, if crank connecting rod and bearing need be changed when maintaining, can unpack left crank and right crank harmlessly apart the realization and change the maintenance.

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 motorcycle 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, it is a schematic structural diagram of the crankshaft of the assembled motorcycle of the present invention. The assembled motorcycle crankshaft of this embodiment 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 pole portion 6. The left crank handle part 3 of the embodiment is provided with an assembling pin 11, and the assembling pin 11 is integrally arranged with the left crank handle part 3 and is parallel to the left crank rod part 4; the right crank handle part 5 is provided with an assembling pin hole 12 matched with the assembling pin column 11; the assembling pin 11 is detachably assembled in the assembling pin hole 12, 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 assembling pin 11; and a circumferential positioning structure and an axial limiting structure for preventing the assembling pin 11 from being drawn out of the assembling pin hole 12 are arranged between the assembling pin 11 and the assembling pin hole 12.

Further, the assembly pin 11 of this embodiment includes a major diameter section 11a and a minor diameter section 11b that are coaxially arranged, the outer diameter of the major diameter section 11a is greater than the outer diameter of the minor diameter section 11b, the assembly pin hole 12 is matched with the minor diameter section 11b, and the crank connecting rod 10 is sleeved on the major diameter section 11 a. Specifically, a needle bearing 13 is arranged between the crank connecting rod 10 and the large-diameter section 11a, and the axial length of the needle bearing 13 is greater than or equal to that of the large-diameter section 11a, so that two ends of the needle bearing 13 are respectively in limit fit with the left crank handle part 3 and the right crank handle part 5. The circumference location structure of this embodiment is including setting up on assembly pinhole 12 inner wall and along the constant head tank 14 that its generating line direction extends and setting on path section 11b periphery wall with constant head tank 14 complex locating piece 15, through the location cooperation structure of constant head tank 14 and locating piece 15, can make and realize circumference location between assembly pinhole 12 and the assembly cotter 11 to make and reach the assembly required precision in the circumference direction of settlement between left crank and the right crank. Of course, in some embodiments, the positioning slot 14 may be provided in multiple numbers, and similarly, the positioning block 15 may also be provided in multiple numbers, which are equivalent in principle and will not be described again.

The axial limiting structure of the embodiment comprises a radial hole 16 which is arranged in the right crank handle part 5 and is vertical to the axis of the assembling pin hole 12, a radial limiting hole 17 is arranged on the assembling pin 11 corresponding to the radial hole 16, and a limiting element 18 which is in limiting fit with the radial limiting hole 17 is arranged in the radial hole 16. The radial hole 16 of the present embodiment includes a radial large diameter section 16a and a radial small diameter section 16b that are coaxially disposed, the radial large diameter section 16a is located on a radially outward side of the radial small diameter section 16b, an inner diameter of the radial large diameter section 16a is larger than an inner diameter of the radial small diameter section 16b, and an inner diameter of the radial limit hole 17 is equal to the inner diameter of the radial small diameter section 16 b. Specifically, an internal thread is arranged in the radial large-diameter section 16a of the present embodiment, the limiting element 18 includes a threaded section 18a in threaded fit with the radial large-diameter section 16a and a smooth section 18b in threaded fit with the radial small-diameter section 16b, and the smooth section 18b extends into the radial limiting hole 17 to be in limiting fit with the assembling pin 11. The radially outward end of the radially large diameter section 16a of the present embodiment is provided with a counter bore 16c, and the end of the threaded section 18a facing away from the smooth section 18b is provided with a limiting head 18c located in the counter bore 16 c. The technical purpose of axially limiting the assembling pin column 11 and the assembling pin hole 12 can be realized by arranging the limiting element 18, and the limiting element 18 is in threaded fit with the radial large-diameter section 16a, so that the limiting element 18 can be conveniently detached, and the technical purpose of detaching the left crank 1 and the right crank 2 is realized.

A lubricating oil passage is arranged between the right crank 2 and the assembling pin 11, the lubricating oil passage comprises a central oil hole 19 arranged in the right crank 2 and a right crank inclined hole 20 communicated with the central oil hole 19, the lubricating oil passage further comprises a communicating oil hole 21 arranged in the assembling pin 11 and penetrating through the left crank handle 3, a communicating hole 22 communicated with the right crank inclined hole 20 and a radial oil hole 23 used for supplying lubricating oil to the needle bearing 13 are arranged on the inner wall of the communicating oil hole 21, and two ends of the communicating oil hole 21 respectively supply lubricating oil to

bearings

24 and 25 arranged on the left crank 1 and the right crank 2.

The assembled motorcycle crankshaft of this embodiment, through set up the assembly round pin post rather than an organic whole on left crank stalk portion, and will assemble the round pin post and directly cooperate with assembly pinhole, utilize circumferential location structure to realize the circumferential location between assembly round pin post and the assembly pinhole, and then realize the circumferential 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 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 needle bearing need be changed when maintaining, can unpack left crank and right crank harmlessly apart and realize changing the maintenance.

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

1. An assembled motorcycle 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) includes right crank stalk portion (5) and right crank pole portion (6), its characterized in that:

an assembling pin column (11) is arranged on the left crank handle part (3), and the assembling pin column (11) and the left crank handle part (3) are integrally arranged and are parallel to the left crank rod part (4); the right crank handle part (5) is provided with an assembling pin hole (12) matched with the assembling pin column (11); the assembling pin column (11) is detachably assembled in the assembling pin hole (12), 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 assembling pin column (11); and a circumferential positioning structure and an axial limiting structure for preventing the assembling pin (11) from being drawn out from the assembling pin hole (12) are arranged between the assembling pin (11) and the assembling pin hole (12).

2. The fabricated motorcycle crankshaft of claim 1, wherein: the assembly pin post (11) is including big footpath section (11a) and the path section (11b) of coaxial setting, the external diameter of big footpath section (11a) is greater than the external diameter of path section (11b), assembly pin hole (12) with path section (11b) cooperation, crank connecting rod (10) suit is in on the big footpath section (11 a).

3. The fabricated motorcycle crankshaft of claim 2, wherein: a needle bearing (13) is arranged between the crank connecting rod (10) and the large-diameter section (11a), and two ends of the needle bearing (13) are respectively in limit fit with the left crank handle part (3) and the right crank handle part (5).

4. The fabricated motorcycle crankshaft of claim 2 or 3, wherein: the circumferential positioning structure comprises a positioning groove (14) which is arranged on the inner wall of the assembly pin hole (12) and extends along the generatrix direction of the assembly pin hole and a positioning block (15) which is arranged on the outer peripheral wall of the small-diameter section (11b) and matched with the positioning groove (14).

5. The fabricated motorcycle crankshaft of claim 1, wherein: the axial limiting structure comprises a radial hole (16) which is arranged in the right crank handle part (5) and is vertical to the axis of the assembling pin hole (12), a radial limiting hole (17) is correspondingly arranged on the assembling pin column (11) and the radial hole (16), and a limiting element (18) which is in limiting fit with the radial limiting hole (17) is arranged in the radial hole (16).

6. The fabricated motorcycle crankshaft of claim 5, wherein: the radial hole (16) comprises a radial large-diameter section (16a) and a radial small-diameter section (16b) which are coaxially arranged, the radial large-diameter section (16a) is positioned on one side of the radial small-diameter section (16b) which is radially outward, the inner diameter of the radial large-diameter section (16a) is larger than that of the radial small-diameter section (16b), and the inner diameter of the radial limiting hole (17) is equal to that of the radial small-diameter section (16 b).

7. The fabricated motorcycle crankshaft of claim 6, wherein: the radial large-diameter section (16a) is internally provided with internal threads, the limiting element (18) comprises a thread section (18a) in threaded fit with the radial large-diameter section (16a) and a smooth section (18b) in threaded fit with the radial small-diameter section (16b), and the smooth section (18b) extends into the radial limiting hole (17) to be in limiting fit with the assembling pin column (11).

8. The fabricated motorcycle crankshaft of claim 7, wherein: a counter bore (16c) is formed in the end, facing outwards in the radial direction, of the radial large-diameter section (16a), and a limiting head (18c) located in the counter bore (16c) is arranged at the end, facing away from the smooth section (18b), of the threaded section (18 a).