CN210461536U - Assembly structure of crankshaft and balance shaft - Google Patents

Assembly structure of crankshaft and balance shaft Download PDF

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Publication number
CN210461536U
CN210461536U CN201921396389.0U CN201921396389U CN210461536U CN 210461536 U CN210461536 U CN 210461536U CN 201921396389 U CN201921396389 U CN 201921396389U CN 210461536 U CN210461536 U CN 210461536U
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China
Prior art keywords
balance shaft
assembly
crank
bearing
guide sleeve
Prior art date
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Active
Application number
CN201921396389.0U
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Chinese (zh)
Inventor
李继才
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Jinan Jiedi Locomotive Technology Co Ltd
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Jinan Jiedi Locomotive Technology Co Ltd
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Priority to CN201921396389.0U priority Critical patent/CN210461536U/en
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Publication of CN210461536U publication Critical patent/CN210461536U/en
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Abstract

An object of the utility model is to provide an assembly structure of bent axle, balanced axle for solve the balanced axle and prevent eccentric mounting's technical problem. An assembly structure of a crankshaft and a balance shaft comprises a crank assembly, the balance shaft assembly, a guide sleeve, a bolt, a box body, a needle bearing, a crank bearing and the guide sleeve; the crank assembly is connected with the balance shaft assembly in a matching way, and the needle bearing and the crank bearing are respectively arranged in a bearing hole of the box body; the end part of the crank assembly is positioned in the crank bearing, the end part of the crank bearing is detachably provided with a guide sleeve, and the lower end part of the guide sleeve is conical.

Description

Assembly structure of crankshaft and balance shaft
Technical Field
The utility model belongs to the technical field of the assembly technique of bent axle, balanced axle and specifically relates to an assembly structure of bent axle, balanced axle.
Background
At present, most of engines for straddle motorcycles are provided with a balance shaft structure, and balance shafts of some models must be assembled with a crankshaft at the same time. Since the balance shaft is assembled at an angle or in a position, the balance shaft must be assembled in a position to balance the crankshaft.
In the assembly mode of the crankshaft and the balance shaft in the prior art, generally, when the crankshaft is pulled into an inner hole of a crankshaft bearing, the balance shaft is also arranged in a needle bearing hole at the same time. However, the height of the balance shaft bearing is not consistent with that of the crankshaft bearing, and the guide of the two shafts cannot be guaranteed during assembly. During assembly, the technical problems that the balance shaft is not easy to align with the bearing hole, the bearing is easy to deflect and the bearing is damaged are easily caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an assembly structure of bent axle, balanced axle for solve the balanced axle and prevent eccentric mounting's technical problem.
The utility model provides a technical scheme that its technical problem adopted is:
an assembly structure of a crankshaft and a balance shaft comprises a crank assembly, the balance shaft assembly, a guide sleeve, a bolt, a box body, a needle bearing, a crank bearing and the guide sleeve;
the crank assembly is connected with the balance shaft assembly in a matching way, and the needle bearing and the crank bearing are respectively arranged in a bearing hole of the box body; the end part of the crank assembly is positioned in the crank bearing, the end part of the crank bearing is detachably provided with a guide sleeve, and the lower end part of the guide sleeve is conical.
Furthermore, the upper end of the guide sleeve is provided with a butt joint port, and the butt joint port is clamped at the lower end part of the balance shaft assembly.
Furthermore, a first guide threaded hole is axially formed in the end portion of the balance shaft assembly, a through second guide threaded hole is axially formed in the guide sleeve, and the first guide threaded hole is coaxially aligned with the second guide threaded hole and is connected with the second guide threaded hole through a bolt.
Further, the balance shaft assembly comprises a balance shaft and a driven gear, and the driven gear is in interference fit with the balance shaft.
Furthermore, the guide sleeve is in clearance fit with the balance shaft.
Further, the crank bearing and the needle bearing are in interference fit with the box body respectively.
Further, the crank bearing and the crank are combined in an interference fit mode.
The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and the above technical solutions have the following advantages or beneficial effects:
1. the utility model discloses the utilization increases a uide bushing at balanced axle head portion, plays the effect of direction when the assembly, has improved assembly quality, especially bearing's assembly precision.
2. The guide sleeve has simple structure and low manufacturing cost, is fixed by a bolt and is easy to assemble and disassemble; the assembly mode not only improves the assembly quality, but also is simple to operate.
Drawings
FIG. 1 is a schematic view of the connection relationship between the crank assembly, the balance shaft assembly and the guide sleeve;
FIG. 2 is a schematic view of the connection relationship between the middle box body, the needle roller bearing and the needle roller bearing inner ring of the present invention;
in the figure: 1. a crank assembly; 2. a balance shaft assembly; 3. a guide sleeve; 4. a bolt; 5. a box body; 6. a needle bearing; 7. a needle bearing inner race; 8. a crank bearing; 9. a driven gear.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and techniques are omitted so as to not unnecessarily limit the invention.
As shown in figures 1 and 2, the assembly structure of the crankshaft and the balance shaft comprises a crank assembly 1, the balance shaft assembly 2, a guide sleeve 3, a bolt 4, a box body 5, a needle bearing 6, a needle bearing inner ring 7, a crank bearing 8 and the guide sleeve 3.
The needle bearing 6 and the crank bearing 8 are both arranged in a bearing hole of the box body 5, and the needle bearing inner ring 7 is arranged in the needle bearing 6. The balance shaft assembly 2 comprises a balance shaft and a driven gear 9 installed on the balance shaft, and a first guide threaded hole is axially formed in the end portion of the balance shaft. The crank assembly 1 includes a crank shaft, and a balance shaft and the crank shaft are arranged in parallel. The upper end of the guide sleeve 3 is provided with a butt joint port, and the lower end of the butt joint port is provided with a through second guide threaded hole; the lower end of the guide sleeve 3 adopts a conical structure. The butt joint of the guide sleeve 3 is inserted at the lower end of the balance shaft, and the first guide threaded hole is coaxially aligned with the second guide threaded hole and connected through a bolt 4. Driven gear 9 and balance shaft interference fit, uide bushing 3 and balance shaft are clearance fit. The outer diameters of the crank bearing 8 and the needle bearing 6 are in interference fit with the box body 5 respectively, the inner diameter of the crank bearing 8 is in interference fit with a crankshaft, and the inner ring 7 of the needle bearing, the needle bearing 6 and the balance shaft are in clearance fit.
When the crank assembly 1 is installed, the balance shaft assembly 2 and the crank assembly 1 are installed into a bearing hole of the box body 5. Since the width of the crank bearing 8 is larger than the width of the needle bearing 6, there is a distance between the balance shaft diameter and the needle bearing 6 when the crank shaft diameter is in contact with the inner race of the crank bearing 8. Because the end part of the guide sleeve 3 is provided with the taper, the guide sleeve can play a role in guiding during assembly, prevents the balance shaft from deflecting and damaging the needle roller bearing 6, and improves the assembly precision of the bearing. After the crank assembly 1 and the balance shaft assembly 2 are installed in the box body 5 in place, the bolt 4 and the guide sleeve 3 need to be detached, and then the needle bearing inner ring 7 is installed from the other surface of the box body 5.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Although the specific embodiments of the present invention have been described with reference to the drawings, the present invention is not limited thereto, and various modifications or variations that can be made by those skilled in the art without inventive labor are still within the scope of the present invention.

Claims (7)

1. An assembly structure of a crankshaft and a balance shaft is characterized by comprising a crank assembly, the balance shaft assembly, a guide sleeve, a bolt, a box body, a needle bearing, a crank bearing and the guide sleeve;
the crank assembly is connected with the balance shaft assembly in a matching way, and the needle bearing and the crank bearing are respectively arranged in a bearing hole of the box body; the end part of the crank assembly is positioned in the crank bearing, the end part of the crank bearing is detachably provided with a guide sleeve, and the lower end part of the guide sleeve is conical.
2. The assembly structure of a crankshaft and a balance shaft according to claim 1, wherein the upper end of the guide sleeve is provided with a butt joint, and the butt joint is clamped at the lower end of the balance shaft assembly.
3. The crankshaft and balance shaft assembly structure as claimed in claim 1, wherein the balance shaft assembly has a first guide threaded hole formed in an axial direction of an end portion thereof, and a second guide threaded hole formed therethrough in an axial direction of the guide sleeve, the first guide threaded hole and the second guide threaded hole being coaxially aligned and connected by a bolt.
4. The assembling structure of a crankshaft and a balance shaft according to claim 1, wherein the balance shaft assembly comprises a balance shaft and a driven gear, and the driven gear is in interference fit with the balance shaft.
5. The assembly structure of claim 1, wherein the guide sleeve is in clearance fit with the balance shaft.
6. The assembling structure of a crankshaft and a balance shaft according to claim 1, wherein the crank bearing and the needle bearing are respectively interference-fitted to the housing.
7. The assembling structure of a crankshaft and a balance shaft according to claim 1, wherein the crank bearing and the crank are combined in an interference fit manner.
CN201921396389.0U 2019-08-26 2019-08-26 Assembly structure of crankshaft and balance shaft Active CN210461536U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921396389.0U CN210461536U (en) 2019-08-26 2019-08-26 Assembly structure of crankshaft and balance shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921396389.0U CN210461536U (en) 2019-08-26 2019-08-26 Assembly structure of crankshaft and balance shaft

Publications (1)

Publication Number Publication Date
CN210461536U true CN210461536U (en) 2020-05-05

Family

ID=70430966

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921396389.0U Active CN210461536U (en) 2019-08-26 2019-08-26 Assembly structure of crankshaft and balance shaft

Country Status (1)

Country Link
CN (1) CN210461536U (en)

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