CN213206443U

CN213206443U - High-rigidity short shaft closed structure balance shaft mechanism

Info

Publication number: CN213206443U
Application number: CN202021111970.6U
Authority: CN
Inventors: 包毅; 刘红武; 张锦; 蔚兴建; 苏怀林; 覃文; 张振平; 李国红
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-05-14
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses a balanced axle mechanism of high rigidity minor axis closed structure relates to engine technical field. Be applied to four jar engines, it arranges in engine cylinder third jar below, including balanced axle bed, the level is equipped with balanced axle I, balanced axle II side by side in the balanced axle bed, balanced axle I, balanced axle II length only span engine cylinder third jar respectively, and the balanced axle I is gone up near balanced axle bed left side inner wall one end and is provided with gear I in balanced axle bed, and the balanced axle I is gone up near balanced axle bed right side inner wall one end and is set up internal balance I in balanced axle bed, and its tip is provided with external balance I, external balance II respectively, the outside of external balance I, external balance II is provided with the apron. The utility model discloses it is high to have balanced axle rigidity, installs the apron additional in the balanced axle bed outside, keeps apart with oil pan machine oil, avoids outer balancing piece I, II rotations of outer balancing piece to beat machine oil.

Description

High-rigidity short shaft closed structure balance shaft mechanism

Technical Field

The utility model relates to the technical field of engines, especially a balanced axle mechanism of high rigidity minor axis closed structure.

Background

At present, with the higher and higher requirements of people on NVH performance, NVH becomes one of important assessment indexes of the comprehensive performance of an engine; particularly for commercial diesel engines, as the requirement of customers on the comfort of commercial vehicles is higher and higher, the vibration reduction and noise reduction of the diesel engine become more and more important. The reciprocating engine has the periodicity of movement of machine parts, and the rotating inertia force and the reciprocating inertia force generated in the operation are periodically changed, wherein the periodically changed second-order reciprocating inertia force is one of important vibration excitation sources of the engine and cannot be counteracted through the structural design of a crankshaft, and a balance shaft mechanism is required to be specially additionally arranged to counteract the second-order reciprocating inertia force. The existing balance shaft gasoline engine adopts a shaft seat scheme of three-gear or multi-gear support, so that a balance shaft mechanism is long and not compact; in addition, a balance shaft scheme supported by a single bearing seat is available in the market, the rigidity of the balance shaft is not good enough, and the vibration reduction is not obvious; meanwhile, the balance block or the balance shaft gear is arranged outside the shaft seat, and the balance shaft gear or the balance block is easy to hit engine oil of the oil pan when rotating.

SUMMERY OF THE UTILITY MODEL

To the problem that exists, the utility model provides a balanced axle mechanism of high rigidity minor axis closed structure, the purpose is solved current balanced axle mechanism balance axle and is constructed verbose, not compact, and the vibration subducts unobviously, and oil pan machine oil is beaten easily to balanced shaft gear or balancing piece when rotatory problem.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a high-rigidity short-shaft closed-structure balance shaft mechanism is applied to a four-cylinder engine, is arranged below a third cylinder of an engine cylinder and comprises a balance shaft seat, a balance shaft I and a balance shaft II are horizontally arranged in the balance shaft seat side by side, the lengths of the balance shaft I and the balance shaft II respectively only stretch across the third cylinder of the engine cylinder, a gear I is arranged at one end, close to the left inner wall of the balance shaft seat, of the balance shaft I in the balance shaft seat, an inner balance block I is arranged at one end, close to the right inner wall of the balance shaft seat, of the balance shaft I in the balance shaft seat, a gear II is arranged at one end, close to the left inner wall of the balance shaft seat, of the balance shaft II in the balance shaft seat, an inner balance block II is arranged at one end, close to the right inner wall of the balance shaft seat, of the balance shaft II in the balance shaft seat, the end parts of the two-way sliding block are respectively provided with an outer balance block I and an outer balance block II, and cover plates are arranged on the outer sides of the outer balance block I and the outer balance block II.

Preferably, the cover plate is fixed on the balance shaft seat by bolts. Thus, the installation and the disassembly are easy, and the replacement of parts in the later period is convenient.

Preferably, the gear I and the inner balance block I are integrally designed, and the gear II and the inner balance block II are integrally designed. The arrangement can reduce the number of parts and has a more compact integral structure.

Preferably, the inner balance weight I and the balance shaft I, and the inner balance weight II and the balance shaft II are connected through fastening pins. The design can facilitate the installation and the disassembly of the inner balance block.

The utility model has the advantages that:

the utility model provides a high-rigidity short-shaft closed structure balance shaft mechanism, which is provided with a short-shaft balance shaft design of two support bearing seats, and the balance shaft has high rigidity; simultaneously install the apron additional in balanced axle bed outside, keep apart with oil pan machine oil, avoid the balancing piece rotation to hit machine oil.

Drawings

Fig. 1 is a schematic structural diagram of a high-rigidity short-axis closed-structure balance shaft mechanism provided in an embodiment of the present invention;

fig. 2 is a sectional view taken along the direction a-a in a high-rigidity short-axis closed-structure balance shaft mechanism provided by an embodiment of the present invention;

fig. 3 is a mounting position diagram of a balance shaft mechanism with a high-rigidity short shaft closed structure in an engine according to an embodiment of the present invention;

in the figure, 1-cover plate, 2-bolt, 3-external balance block I, 4-gear I, 5-balance shaft I, 6-balance shaft seat, 7-fastening pin, 8-internal balance block I, 9-internal balance block II, 10-balance shaft II, 11-gear II, 12-external balance block II, 13-bush, 14-thrust plate, 15-engine cylinder third cylinder and 16-crankshaft.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.

Examples

As shown in fig. 1-3, the utility model provides a high-rigidity short-shaft closed structure balance shaft mechanism, which is applied to a four-cylinder engine, and is arranged below a third cylinder 15 of an engine cylinder, and comprises a balance shaft seat 6, a balance shaft I5 and a balance shaft II 10 are horizontally arranged in the balance shaft seat 6 side by side, the lengths of the balance shaft I5 and the balance shaft II 10 respectively only span the third cylinder 15 of the engine cylinder, a gear I4 is arranged at one end of the balance shaft I5 in the balance shaft seat 6, which is close to the left inner wall of the balance shaft seat 6, an inner balance weight I8 is arranged at one end of the balance shaft I5 in the balance shaft seat 6, which is close to the right inner wall of the balance shaft seat 6, a gear II 11 is arranged at one end of the balance shaft II 10 in the balance shaft seat 6, which is close to the left inner wall of the balance shaft seat 6, and an inner balance weight II 9 is, gear I4 meshes with gear II 11 mutually, I5, II 10 of balanced axle are worn out from 6 left sides of balanced axle bed respectively, and its tip is provided with outer balancing piece I3, outer balancing piece II 12 respectively, the outside of outer balancing piece I3, outer balancing piece II 12 is provided with apron 1.

The mechanism is arranged below a third cylinder 15 of an engine cylinder, specifically, the mounting position is arranged below a third crank (from the front end) of a crankshaft 16 and fastened on a machine body, a balance shaft seat 6 is a mounting base body, a bushing 13 is arranged in a bearing seat hole of the balance shaft seat 6, a balance shaft I5 is arranged in the bushing 13, a gear I4 and an inner balance block I8 are sequentially arranged on the balance shaft I5 inside the balance shaft seat 6 from left to right, as shown in figure 2, the balance shaft I5 penetrates out of the left side of the balance shaft seat 6, an outer balance block I3 is arranged at the penetrating end of the balance shaft I5, an outer balance block II 12 is arranged on a similar balance shaft II 10, a cover plate 1 is additionally arranged on the outer sides of the end surfaces of the outer balance block I3 and the outer balance block II 12, the cover plate 1 forms a relatively closed space, the outer balance block 3 and the outer balance block II 12 are also isolated from engine oil of an, The outer balance weight II 12 does not hit the engine oil.

The data of the deformation of the balance shaft with long span (spanning two cylinders and more than two cylinders) and the short balance shaft of the mechanism under the same pressure are compared in the following table:

as can be seen from the table above, the deformation of the long balance shaft is 0.052mm, while the deformation of the short shaft of the mechanism is 0.00286mm, which is smaller than that of the long balance shaft, the rigidity of the mechanism is greatly improved, and the balance rate of the short shaft of the mechanism reaches 91.7%. Therefore, the design of the short shaft balance shaft with the two support bearing seats is realized, and the rigidity of the balance shaft is high. In addition, install the apron additional in the balanced axle bed outside, keep apart with oil pan machine oil, avoid the balancing piece rotation to hit machine oil.

Furthermore, the cover plate 1 is fixed on a balance shaft seat 6 by a bolt 2. Thus, the installation and the disassembly are easy, and the replacement of parts in the later period is convenient.

Furthermore, gear I4 and inner balance block I8 are integrated design as an organic whole, and gear II 11 and inner balance block II 9 are integrated design as an organic whole. The arrangement can reduce the number of parts and has a more compact integral structure.

Further, the inner balance weight I8 and the balance shaft I5, and the inner balance weight II 9 and the balance shaft II 10 are connected through a fastening pin 7. Such a design may facilitate its installation and removal.

Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A high-rigidity short-shaft closed-structure balance shaft mechanism is applied to a four-cylinder engine, is arranged below a third cylinder of an engine cylinder and comprises a balance shaft seat and is characterized in that a balance shaft I and a balance shaft II are horizontally arranged in the balance shaft seat side by side, the lengths of the balance shaft I and the balance shaft II respectively only stretch across the third cylinder of the engine cylinder, a gear I is arranged at one end, close to the left inner wall of the balance shaft seat, of the balance shaft I in the balance shaft seat, an inner balance block I is arranged at one end, close to the right inner wall of the balance shaft seat, of the balance shaft I in the balance shaft seat, a gear II is arranged at one end, close to the left inner wall of the balance shaft seat, of the balance shaft II in the balance shaft seat, an inner balance block II is arranged at one end, close to the right inner wall of the balance shaft seat, of the balance shaft II in the balance shaft seat, the end parts of the two-way sliding block are respectively provided with an outer balance block I and an outer balance block II, and cover plates are arranged on the outer sides of the outer balance block I and the outer balance block II.

2. The closed high stiffness short axis structural balance shaft mechanism of claim 1 wherein the cover plate is bolted to the balance shaft seat.

3. The high-rigidity short-shaft closed structure balance shaft mechanism as claimed in claim 1, wherein the gear I and the inner balance block I are integrally designed, and the gear II and the inner balance block II are integrally designed.

4. The high-rigidity short-shaft closed structure balance shaft mechanism as claimed in claim 1, wherein the inner balance block I and the balance shaft I, and the inner balance block II and the balance shaft II are connected through fastening pins.