CN215059189U - Balance shaft for secondary balance mechanism - Google Patents
Balance shaft for secondary balance mechanism Download PDFInfo
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- CN215059189U CN215059189U CN202121351283.6U CN202121351283U CN215059189U CN 215059189 U CN215059189 U CN 215059189U CN 202121351283 U CN202121351283 U CN 202121351283U CN 215059189 U CN215059189 U CN 215059189U
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- balance
- shaft
- inner flat
- mounting
- flat hole
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Abstract
A balance shaft for a secondary balance mechanism relates to the technical field of mechanical equipment. The method is used for improving the quality of products while reducing the production cost. A balance shaft for a secondary balance mechanism comprises a rotating shaft and two balance wheels, wherein each balance wheel is provided with an inner flat hole; the inner side surface of the inner flat hole is composed of a first part and a second part, the first part is cylindrical, and the second part is planar; the rotating shaft is provided with two mounting parts, and each mounting part is provided with one balance wheel; the outer contour of the mounting part is matched with the hole pattern of the inner flat hole, and the balance wheel is sleeved on the rotating shaft through the matching of the inner flat hole and the mounting part. The method has the beneficial effects that the production cost is reduced, and the product quality is improved.
Description
Technical Field
The utility model belongs to the technical field of mechanical equipment technique and specifically relates to a balance shaft for second grade balance mechanism.
Background
The double-balance shaft mechanism is also called a second-order balance mechanism and is mainly applied to a diesel engine. The working principle is that second-order reciprocating inertia force is eliminated or reduced, the balance shaft mechanism is driven to rotate through the crankshaft, the rotating speed of the balance shaft is 2 times of that of the crankshaft, and the inertia force generated by eccentric shaft rotation in the rotating process of the balance shaft is offset with the second-order reciprocating inertia force of the engine, so that the vibration reduction effect is achieved.
The balance shaft is an important component of the secondary balance mechanism. The following several configurations of balance shafts exist in the prior art.
One is monolithic: the structure is manufactured by manufacturing the rotating shaft and the balance wheel into an integrated structure through a casting processing mode, and the structure has the problems of high mold cost, short service life of the mold and further improvement of the processing cost of the balance shaft. Meanwhile, the problem of low machining precision of the balance shaft is easily caused.
The other is a split type, for example, the balance shaft related in the patent of chinese patent "a balance shaft structure of engine" with application number 2020211106458 is actually a split type structure, and the structure makes the rotating shaft (first balance shaft) and the balance weight 17 into a split type structure. The problem with this arrangement is that the two parts of the weight are formed as a unitary structure and the casting costs are relatively high. In addition, the connection of the balance weight on the shaft also depends on screws, and the structure is easy to fail and low in assembly efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a balance shaft for second grade balance mechanism for improve the quality of product in reduction in production cost.
The utility model provides a technical scheme that its technical problem adopted is:
a balance shaft for a secondary balance mechanism comprises a rotating shaft and two balance wheels, wherein each balance wheel is provided with an inner flat hole;
the inner side surface of the inner flat hole is composed of a first part and a second part, the first part is cylindrical, and the second part is planar;
the rotating shaft is provided with two mounting parts, and each mounting part is provided with one balance wheel;
the outer contour of the mounting part is matched with the hole pattern of the inner flat hole, and the balance wheel is sleeved on the rotating shaft through the matching of the inner flat hole and the mounting part.
Further, the inner flat hole is in interference fit with the installation part.
Further, the pivot is including keeping apart the axis body, two the installation department distributes in the both sides of keeping apart the axis body, the diameter of installation department is less than the diameter of keeping apart the axis body.
Further, the second portion is perpendicular to a radial direction of the first portion.
The beneficial effects are that:
the utility model discloses in establish balanced balance wheel cover on the pivot through the cooperation between interior flat hole and the installation department, do benefit to separately producing pivot and two balanced balance wheels. Thereby being beneficial to reducing the production difficulty, reducing the production cost and improving the production efficiency. Simultaneously, also do benefit to the material of independent selection pivot portion, do benefit to the intensity of reinforcing pivot, and then do benefit to the improvement the utility model discloses holistic life-span. Furthermore, the utility model discloses an in-process still has and is processing the utility model discloses an in-process does benefit to accurate control the utility model discloses a holistic unbalance degree does benefit to and improves the machining precision, its reason lies in-the utility model discloses a structure does benefit to and can separately through casting processing production to two balanced balances the balance wheels on lieing in the pivot, and this can reduce the complexity of mould by a wide margin, also does benefit to the quality and the focus position of accurate control balance wheel in further course of working, and then improves the precision of balanced balance wheel processing, and then also and improved the utility model discloses a machining precision
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a schematic view of a balance in an embodiment of the invention;
FIG. 3 is a schematic sectional view taken along line A-A of FIG. 2;
FIG. 4 is a transverse cross-sectional view of the mounting portion;
in the figure: 1 rotating shaft, 11 mounting parts, 111 tangent plane, 12 isolation shaft bodies, 121 tangent plane, 2 balance wheels, 21 inner flat holes, 211 first part and 212 second part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 4, a balance shaft for a two-stage balance mechanism comprises a rotating shaft 1 and two balance wheels 2, wherein each balance wheel 2 is provided with an inner flat hole 21. The inner side surface of the inner flat hole 21 is composed of a first part 211 and a second part 212, wherein the first part 211 is cylindrical, and the second part 212 is planar; the inner flat hole 21 is processed by broaching. Two mounting parts 11 are arranged on the rotating shaft 1, and each mounting part 11 is provided with a balance wheel 2. The outer contour of the mounting portion 11 matches the hole pattern of the flat inner hole 21-i.e. the mounting portion 11 comprises a cylindrical portion and a chamfer 111 provided on the cylindrical portion. The balance wheel 2 is sleeved on the rotating shaft through the matching of the inner flat hole 21 and the mounting part 11. The mass of the two balance wheels may be different. 40Cr steel is adopted and is subjected to high-frequency quenching treatment to be used as a material for processing the rotating shaft 1; 45# steel is adopted as the material of the balance wheel, and the balance wheel is produced and processed in a casting mode.
As shown in fig. 1, the overall unbalance of the present embodiment is 1.93 kg.
As shown in fig. 1 to 4, the beneficial effects of the utility model reside in that, the utility model discloses in establish balanced balance 2 cover on pivot 1 through the cooperation between interior flat hole 21 and the installation department, do benefit to separately producing pivot 1 and two balanced balance 2. Thereby being beneficial to reducing the production difficulty, reducing the production cost and improving the production efficiency. Simultaneously, also do benefit to the material of 1 part of independent selection pivot, do benefit to the intensity that strengthens pivot 1, and then do benefit to the improvement the utility model discloses holistic life-span. Furthermore, the utility model discloses an in-process still has and is processing the utility model discloses an in-process does benefit to accurate control the utility model discloses holistic unbalance degree does benefit to and improves the machining precision, its reason lies in-the utility model discloses a structure does benefit to and can separately through casting processing production to two balanced balance 2 on being located pivot 1, and this complexity that can reduce the mould by a wide margin also does benefit to the quality and the focus position of accurate control balance 2 in further course of working, and then improves the precision to balanced balance 2 processing, and then has also improved the machining precision of the utility model discloses a machining precision.
As shown in fig. 1 to 4, the inner flat hole 21 is in interference fit with the mounting portion 11. This facilitates the reliability of the connection of balance 2 to mounting portion 11, and also facilitates the simplification or even elimination of the need for additional auxiliary components for the connection of balance 2 to shaft 1, with the effect of a simple and reliable connection. And is also beneficial to reducing the production cost.
As shown in fig. 1 to 4, the rotating shaft 1 includes an isolation shaft body 12, and two mounting portions 11 are distributed on two sides of the isolation shaft body 12, that is, one of the mounting portions is located on one side of the isolation shaft body 12, and the other mounting portion is located on the other side of the isolation shaft body 12. The diameter of installation department 11 is less than the diameter of keeping apart the axis body 12, and then forms the shaft shoulder between installation department 11 and isolation axis body 12, and this axle will be used for 2 location work of balanced balance wheel that correspond, and then do benefit to the improvement the utility model discloses a machining precision.
The cross section of the rotating shaft means a section perpendicular to the axis of the rotating shaft.
As shown in fig. 4, the second portion 212 is perpendicular to the radial direction of the first portion 211, the second portion 212 is a planar feature, and the first portion 211 is a cylindrical lateral feature, the planar feature being perpendicular to the diameter of the cylindrical lateral feature. This facilitates smooth sleeving of the balance wheel onto the shaft and also facilitates machining of the mounting portion.
Claims (4)
1. A balance shaft for a secondary balance mechanism is characterized by comprising a rotating shaft and two balance wheels, wherein each balance wheel is provided with an inner flat hole;
the inner side surface of the inner flat hole is composed of a first part and a second part, the first part is cylindrical, and the second part is planar;
the rotating shaft is provided with two mounting parts, and each mounting part is provided with one balance wheel;
the outer contour of the mounting part is matched with the hole pattern of the inner flat hole, and the balance wheel is sleeved on the rotating shaft through the matching of the inner flat hole and the mounting part.
2. The balance shaft for a secondary balance mechanism of claim 1 wherein the inner flat bore is an interference fit with the mounting portion.
3. The balance shaft according to claim 1, wherein the shaft comprises an isolation shaft body, two of the mounting portions are disposed on two sides of the isolation shaft body, and the diameter of the mounting portions is smaller than that of the isolation shaft body.
4. The balance shaft for a secondary balance mechanism of claim 1 wherein said second portion is perpendicular to a radial direction of said first portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121351283.6U CN215059189U (en) | 2021-06-17 | 2021-06-17 | Balance shaft for secondary balance mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121351283.6U CN215059189U (en) | 2021-06-17 | 2021-06-17 | Balance shaft for secondary balance mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215059189U true CN215059189U (en) | 2021-12-07 |
Family
ID=79203855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121351283.6U Active CN215059189U (en) | 2021-06-17 | 2021-06-17 | Balance shaft for secondary balance mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215059189U (en) |
-
2021
- 2021-06-17 CN CN202121351283.6U patent/CN215059189U/en active Active
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