CN210859684U

CN210859684U - Balance shaft

Info

Publication number: CN210859684U
Application number: CN201920984422.5U
Authority: CN
Inventors: 李栋; 王启峰; 罗国良; 王刚; 杨燕楠; 李连升
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-06-26
Anticipated expiration: 2029-06-27

Abstract

The utility model relates to the technical field of balance shafts, in particular to a balance shaft, which comprises a balance shaft body, a balance block and a plurality of shaft necks, wherein a main oil duct is arranged on the balance shaft body; the plurality of shaft necks are arranged coaxially, the plurality of shaft necks are arranged on the balance shaft body at intervals, each shaft neck is provided with an oil distribution channel, an opening at one end of each oil distribution channel is arranged on the peripheral surface of the corresponding shaft neck, and the other end of each oil distribution channel is communicated with the main oil channel; the balancing weight comprises a first balancing weight and a second balancing weight which are arranged on the balancing shaft body, the first balancing weight is arranged between any two adjacent shaft necks, the second balancing weight is arranged at each of two axial ends of the balancing shaft body, and the shaft necks are located between the two second balancing weights. The oil duct for lubricating the shaft neck is arranged in the balance shaft, so that the shell does not need to be machined with a lubricating oil duct, the design difficulty and the machining difficulty can be effectively reduced, and the cost can be effectively reduced.

Description

Balance shaft

Technical Field

The utility model relates to a balance shaft technical field especially relates to a balance shaft.

Background

Balance shafts are used in vehicles to reduce or eliminate the free inertia forces of the engine (especially reciprocating piston engines) and thereby minimize any operational noise or vibration.

The balance shaft provided in the related art generally includes two coaxially disposed journals, the journals are mounted on the engine through bearing bushes, a gear is thermally mounted on an outer side of one of the journals, and balance blocks are disposed between the two journals, and are both designed to be semicircular and have a high center of gravity. The balance shaft is lubricated mainly by drilling an oil passage on the shell and providing lubrication for the joint surfaces of the journals and the bearing bushes through the oil passage, but the process of drilling the oil passage on the shell is complex, the oil passage needs to be arranged corresponding to each journal, the number of the oil passages to be processed is large, and the oil leakage risk is easy to occur. Meanwhile, the balance shaft only provides unbalance through the balance block between the two shaft necks, the balance shaft is relatively large in deformation during movement, oil films at contact positions of the shaft necks and the bearings are not favorably generated, and a large enough bushing needs to be designed in order to meet the requirement of the sufficient oil films.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a balance shaft to solve among the prior art balance shaft and provide lubrication through boring the oil duct on the casing, oil duct is in large quantity, has the problem of oil leak risk.

The utility model provides a balance shaft, this balance shaft includes:

the balance shaft comprises a balance shaft body, wherein a main oil duct is arranged on the balance shaft body;

the shaft necks are arranged coaxially, the shaft necks are arranged on the balance shaft body at intervals, each shaft neck is provided with a branch oil channel, an opening at one end of each branch oil channel is arranged on the peripheral surface of the corresponding shaft neck, and the other end of each branch oil channel is communicated with the main oil channel;

the balance weight comprises a first balance weight and a second balance weight which are arranged on the balance shaft body, the first balance weight is arranged between any two adjacent shaft necks, the second balance weight is arranged at two axial ends of the balance shaft body, and the plurality of shaft necks are arranged between the two second balance weights.

Preferably, each of the first weights and each of the second weights are located on the same side of the balance shaft body.

Preferably, the second weight has a fan shape.

Preferably, the main oil gallery penetrates through two ends of the balance shaft body in the axial direction, and the two ends of the main oil gallery are plugged through plugs.

Preferably, the first weight includes two first weights spaced apart from each other in an axial direction of the balance shaft body and a second weight connecting the two first weights, and the two first weights and the second weight are both disposed on the balance shaft body.

Preferably, the first weight and the second weight are each fan-shaped.

Preferably, the balance shaft further comprises a mounting part arranged on the balance shaft body, and the mounting part is used for mounting a gear.

Preferably, at least one of the two end faces of the gear is provided with a groove.

Preferably, the number of the journals is three, the three journals are respectively a first journal, a second journal and a third journal, the balance shaft body comprises a first end and a second end which are oppositely arranged, the first journal and the third journal are respectively adjacent to the first end and the second end, and the gear is arranged between the second journal and the third journal.

Preferably, a plurality of oil distribution channels are arranged on the first journal, and the oil distribution channels are uniformly distributed on the circumferential surface of the first journal.

The utility model has the advantages that:

the utility model provides a balance shaft, which comprises a balance shaft body, a balance block and a plurality of shaft necks, wherein a main oil duct is arranged on the balance shaft body; the plurality of shaft necks are arranged coaxially, the plurality of shaft necks are arranged on the balance shaft body at intervals, and the peripheral surface of each shaft neck is provided with an oil distributing channel communicated with the main oil channel; the balancing weight comprises a first balancing weight and a second balancing weight which are arranged on the balancing shaft body, the first balancing weight is arranged between any two adjacent shaft necks, the second balancing weight is arranged at each of two axial ends of the balancing shaft body, and the shaft necks are located between the two second balancing weights. The oil duct for lubricating the shaft neck is arranged in the balance shaft, so that the shell does not need to be machined with a lubricating oil duct, the design difficulty and the machining difficulty can be effectively reduced, and the cost can be effectively reduced.

Drawings

Fig. 1 is a first schematic structural diagram of a balance shaft according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of the balance shaft in the embodiment of the present invention;

fig. 3 is a sectional view taken along a-a in fig. 2.

In the figure:

1. a balance shaft body; 11. a main oil gallery; 2. a journal; 21. an oil distributing channel; 3. a first weight; 4. a second weight; 31. a first balance body; 32. a second balance body; 5. a gear; 51. a groove; 6. and (7) a plug.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 to 3, the present embodiment provides a balance shaft, which includes a balance shaft body 1, a balance block, and a plurality of journals 2, wherein the balance shaft body 1 is provided with a main oil gallery 11; the plurality of journals 2 are coaxially arranged, the plurality of journals 2 are arranged on the balance shaft body 1 at intervals, each journal 2 is provided with a branch oil channel 21, an opening at one end of each branch oil channel 21 is arranged on the circumferential surface of the corresponding journal 2, and the other end of each branch oil channel 21 is communicated with the main oil channel 11; the balancing piece is including all setting up first balancing piece 3 and the second balancing piece 4 on balanced axle body 1, all is equipped with first balancing piece 3 between two arbitrary adjacent journals 2, and balanced axle body 1 axial both ends all are equipped with second balancing piece 4, and a plurality of journals 2 are located between two second balancing pieces 4. In the present embodiment, the branch oil passage 21 of one of the journal 2 is used to communicate with a lubrication oil passage, and the lubrication oil enters the main oil passage 11 through the branch oil passage 21 of the journal 2 and is branched to the other branch oil passages 21 through the main oil passage 11 so as to lubricate each of the journals 2. In this embodiment, the balance shaft body 1 is cylindrical. This embodiment sets up the inside at the balance shaft through the oil duct with lubricated axle journal 2 to can need not to carry out lubricated oil duct processing to the casing, can effectively reduce the design degree of difficulty and the processing degree of difficulty, and can effectively reduce cost.

Alternatively, each of the sub-oil passages 21 extends in the radial direction of the corresponding journal 2, and the distances of each of the sub-oil passages 21 from both ends of the corresponding journal 2 in the axial direction are equal.

Alternatively, the centers of gravity of each first weight 3 and each second weight 4 are located on the same side of the balance shaft body 1. When the balance shaft rotates, the second balance block 4 and the first balance block 3 provide unbalance in the same direction at the same time, so that the two shaft journals 2 respectively close to the two ends of the balance shaft body 1 bear radial force on the two sides in the axial direction of the balance shaft body 1, the two ends of the balance shaft body 1 cannot be seriously deformed, the formation of an oil film is facilitated, and meanwhile, excessive design requirements on the bushing are avoided.

Optionally, the main oil gallery 11 penetrates through two ends of the balance shaft body 1 in the axial direction, and ports at two ends of the main oil gallery 11 are plugged by plugs 6. Specifically, the plug 6 may be a screw plug, or a rivet may be pulled at a port of the main oil gallery 11, and the rivet may be deformed to plug the port.

Alternatively, the first weight 3 includes two first weights 31 disposed at intervals in the axial direction of the balance shaft body 1 and a second weight 32 connecting the two first weights 31, and both the two first weights 31 and the second weight 32 are disposed on the balance shaft body 1.

Optionally, the second weight 4 is fan-shaped. The first balance body 31 and the second balance body 32 are each fan-shaped. The center of gravity of the second weight 4, the first weight 31 and the second weight 32 can be moved down as much as possible under the premise of a certain mass to form a large unbalance amount, and the light weight of the balance shaft design is realized.

In this embodiment, the central angle corresponding to the first balance body 31 is larger than the central angle corresponding to the second balance body 32.

Optionally, the balance shaft further comprises a mounting portion provided on the balance shaft body 1 for mounting the gear 5. It can be understood that the normal section of the mounting portion is circular, the gear 5 is provided with a mounting hole for mounting, and the diameter of the mounting hole is smaller than the outer diameter of the mounting portion, and the gear 5 is mounted on the mounting portion by a hot-fitting process.

Optionally, at least one of the two end faces of the gear wheel 5 is provided with a groove 51. By designing the recess 51, a large unbalance of the gear wheel 5 can be achieved.

In this embodiment, the number of journals 2 is three, and three journals 2 are first journal, second journal and third journal respectively, and balance shaft body 1 includes relative first end and the second end that sets up, and first journal and third journal are adjacent to first end and second end respectively, and gear 5 sets up between second journal and third journal. The first journal is provided with a plurality of oil distribution channels 21, and the oil distribution channels 21 are uniformly distributed on the circumferential surface of the first journal. And can be connected with an external lubricating oil path through a plurality of branch oil passages 21 on the first journal.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A balance shaft, comprising:

the balance shaft comprises a balance shaft body (1), wherein a main oil duct (11) is arranged on the balance shaft body (1);

the balance shaft comprises a plurality of shaft necks (2), the shaft necks (2) are arranged coaxially, the shaft necks (2) are arranged on the balance shaft body (1) at intervals, an oil distribution channel (21) is arranged on each shaft neck (2), an opening at one end of each oil distribution channel (21) is arranged on the peripheral surface of the corresponding shaft neck (2), and the other end of each oil distribution channel (21) is communicated with the main oil channel (11);

the balance weight comprises a first balance weight (3) and a second balance weight (4) which are arranged on the balance shaft body (1), the first balance weight (3) is arranged between any two adjacent shaft necks (2), the second balance weight (4) is arranged at two axial ends of the balance shaft body (1), and the shaft necks (2) are located between the two second balance weights (4).

2. Balance shaft according to claim 1, wherein each of the first weights (3) and each of the second weights (4) are located on the same side of the balance shaft body (1).

3. Balance shaft according to claim 1, wherein the second weight (4) is fan-shaped.

4. The balance shaft according to claim 1, wherein the main oil gallery (11) penetrates through two ends of the balance shaft body (1) in the axial direction, and two ends of the main oil gallery (11) are blocked by plugs (6).

5. The balance shaft according to claim 1, wherein the first weight (3) includes two first weights (31) disposed at intervals in an axial direction of the balance shaft body (1) and a second weight (32) connecting the two first weights (31), and the two first weights (31) and the second weight (32) are both disposed on the balance shaft body (1).

6. Balance shaft according to claim 5, wherein the first balance body (31) and the second balance body (32) are each fan-shaped.

7. Balance shaft according to claim 1, characterized in that it further comprises a mounting provided on the balance shaft body (1), for mounting a gear wheel (5).

8. Balance shaft according to claim 7, characterized in that at least one of the two end faces of the gear wheel (5) is provided with a groove (51).

9. The balance shaft of claim 7, wherein the number of journals (2) is three, the three journals (2) being a first journal, a second journal and a third journal, respectively, the balance shaft body (1) comprising oppositely disposed first and second ends, the first and third journals being adjacent to the first and second ends, respectively, the gear (5) being disposed between the second and third journals.

10. The balance shaft according to claim 9, wherein a plurality of the branch oil passages (21) are provided on the first journal, and the plurality of the branch oil passages (21) are uniformly distributed along the circumferential direction of the first journal.