CN216811814U

CN216811814U - Rocker arm bushing, engine and vehicle

Info

Publication number: CN216811814U
Application number: CN202123322740.1U
Authority: CN
Inventors: 庄绪强; 周龙; 高磊
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-06-24
Anticipated expiration: 2031-12-27

Abstract

The utility model relates to the technical field of engines, in particular to a rocker arm bushing, an engine and a vehicle. The rocker arm bushing comprises a bushing body, a groove area is arranged in a bearing area of the inner wall of the bushing body, a plurality of independent grooves are arranged in the groove area, the cross sectional area of each groove is gradually reduced from the inner wall of the bushing body to the outer direction of the bushing body, so that a dynamic pressure oil film can be formed, the bearing performance of the rocker arm bushing can be improved, and the abrasion loss is reduced. In addition, the notch of each groove is provided with a bulge, a supporting gap is formed between each bulge and the rocker arm shaft, lubricating oil can be rapidly distributed on the surface of the lining and in the groove, the oil film can rotate at a high speed along with the rotation of the bearing in the working process of the rocker arm, when the lubricating oil meets the groove structure, the oil film is gradually pushed forwards along with the gradual reduction of the cross section area of the groove, an obvious accumulation effect is formed along with the increase of the lubricating oil, and finally the lubricating oil is forced to overflow along the edge of the groove to form dynamic pressure.

Description

Rocker arm bushing, engine and vehicle

Technical Field

The utility model relates to the technical field of engines, in particular to a rocker arm bushing, an engine and a vehicle.

Background

The rocker arm bushing is a ring bushing which plays a role of a sliding bearing between a rocker arm shaft and a rocker arm in the valve actuating mechanism. The rocker arm bushing is generally composed of a metal tile back and an antifriction alloy layer, and forms a sliding friction pair with the rocker arm shaft and the like. The rocker arm bushing surface is typically smooth or grooved in configuration when viewed microscopically. According to the elastohydrodynamic theory and the bionic research, the smoother the surface of the friction pair is, the better the surface is, the too smooth the surface of the friction pair is, when the surface is poor in oil, an oil film is difficult to form, boundary friction and even dry friction are formed, the abrasion is accelerated, and the rocker arm bushing is abraded. Although the dry friction can be reduced to a certain extent by arranging the groove in the bushing in the prior art, the structure of the groove is not easy to rapidly distribute lubricating oil on the surface of the bushing, and the lubricating oil is distributed on the surface of the bushing along with the outflow of the swinging lubricating oil of the rocker arm shaft from the groove, but the problems that the lubrication on the surface of the bushing is uneven and the dry friction still exists still exist.

Therefore, a need exists for a rocker arm bushing to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a rocker arm bushing, an engine and a vehicle, which can quickly distribute lubricating oil on the surface of the bushing when a rocker arm shaft rotates, and prevent dry friction in the rotating process of the rocker arm shaft.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the rocker arm bushing comprises a bushing body, a groove area is arranged in a bearing area of the inner wall of the bushing body, a plurality of independent grooves are arranged in the groove area, the cross sectional area of each groove is gradually reduced from the inner wall of the bushing body to the outer direction of the bushing body, a protrusion is arranged on a notch of each groove, and the bearing area is an area where a shaft is in contact with the bushing body in the maximum load state of gas in an engine cylinder.

As a preferable technical scheme of the rocker arm bushing, the cross section of the groove is in a drop shape or a triangular shape.

As a preferable technical solution of the above rocker arm bushing, the length direction of the groove is the same as or opposite to the rotation direction of the rocker arm.

As a preferable technical scheme of the rocker arm bushing, the grooves are arranged in a matrix form, the large ends of each row of the grooves are arranged in the same direction, and the large ends of two adjacent rows of the grooves are arranged in different directions.

As a preferable technical scheme of the rocker arm bushing, the length of the maximum cross section of the groove is 0.3mm-0.4mm, the width of the maximum cross section of the groove is 0.15mm-2mm, and the depth of the groove is 0.035mm-0.05 mm.

As a preferable technical solution of the above rocker arm bushing, the protrusion is provided at a notch at a large end of the groove.

As a preferable aspect of the above rocker arm bushing, the raised top wall is higher than the notch of the groove.

As a preferable technical scheme of the rocker arm bushing, the protrusion is further arranged at a notch at the transition connection position of the large end of the groove and the small end of the groove.

The utility model also provides an engine comprising the rocker arm bushing in any scheme.

The utility model also provides a vehicle comprising the engine in the scheme.

The utility model has the beneficial effects that:

the rocker arm bushing provided by the utility model comprises a bushing body, wherein a groove area is arranged in a bearing area of the inner wall of the bushing body, a plurality of independent grooves are arranged in the groove area, and the cross section area of each groove is gradually reduced from the inner wall of the bushing body to the outer direction of the bushing body, so that a dynamic pressure oil film can be formed, the bearing capacity of the rocker arm bushing can be improved, and the abrasion loss can be reduced. In addition, the notch of each groove is provided with a bulge, a supporting gap is formed between each bulge and the rocker shaft, lubricating oil can be favorably and quickly distributed on the surface of the bushing and in the groove, the bulges can also prevent the lubricating oil in the groove of the rocker shaft at the initial rotation stage from completely flowing out of the groove along with the rotation of the rocker shaft, no lubricating oil is reserved in the groove, and the dry friction of the rocker shaft bushing is prevented.

In the working process of the rocker arm, the oil film also rotates at a high speed along with the rotation of the bearing, when lubricating oil meets the groove structure, the oil film is gradually pushed forwards along with the gradual reduction of the cross section area of the groove, an obvious accumulation effect is formed along with the increase of the lubricating oil, and finally the oil film is forced to overflow along the edge of the groove to form dynamic pressure.

The engine and the vehicle that provide in this embodiment can do benefit to lubricating oil fast distribution in bush body and recess at the during operation, prevent rocking arm bush dry friction, guarantee the stable work of engine and vehicle.

Drawings

FIG. 1 is a schematic structural view of a rocker arm bushing provided by an embodiment of the present invention;

FIG. 2 is a schematic view of a groove arrangement of a bushing body according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a groove provided by an embodiment of the present invention;

fig. 4 is a schematic diagram of the position between the nozzle and the bushing body when the groove is machined according to the embodiment of the utility model.

In the figure:

1. a bushing body; 11. a groove; 12. a protrusion; 2. a rocker arm; 3. a rocker shaft; 4. a nozzle; 5. particles.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating 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 embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment of the utility model provides a vehicle, which comprises an engine, wherein the engine comprises a rocker arm bushing, and the rocker arm bushing can inhibit lubricating oil in a groove and prevent the lubricating oil from flowing out of the groove easily in normal work.

Specifically, as shown in fig. 1 to 3, the rocker arm bushing provided in this embodiment includes a bushing body 1, a bearing area of an inner wall of the bushing body 1 is provided with a groove area, a plurality of independent grooves 11 are provided in the groove area, the grooves 11 can store part of lubricating oil, and dry friction of the bushing body 1 is reduced when the rocker arm shaft 3 and the bushing body 1 are worn in early stage or are frequently started and stopped; the cross-sectional area of the groove 11 is gradually reduced from the inner wall of the bushing body 1 to the outer direction of the bushing body 1, so that a dynamic pressure oil film can be formed, the bearing capacity of the rocker arm bushing can be improved, and the abrasion loss is reduced. In addition, the notch of each groove 11 is provided with the bulge 12, a gap is formed between the bushing body 1 and the rocker arm shaft 3, lubricating oil can be favorably and quickly distributed in the inner wall of the bushing body 1 and the groove 11, and the bulge 12 can also prevent the lubricating oil in the groove 11 of the rocker arm shaft 3 at the initial rotation stage from completely flowing out of the groove 11 along with the rotation of the rocker arm shaft 3, so that no lubricating oil is reserved in the groove 11, and the dry friction of the rocker arm bushing is prevented. Wherein, the bearing area is the area where the rocker arm shaft 3 contacts the bush body 1 under the maximum load state of the gas in the engine cylinder.

After working for a period of time, the bulge 12 is ground flat, in the working process of the rocker arm 2, along with the rotation of the bearing, the oil film also rotates at a high speed, when lubricating oil meets the structure of the groove 11, along with the gradual reduction of the cross section area of the groove 11, the oil film is also gradually pushed forwards, along with the increase of the lubricating oil, an obvious accumulation effect is formed, and finally, the oil film is forced to overflow along the edge of the groove 11 to form dynamic pressure.

Optionally, the cross-sectional shape of the groove 11 is drop-shaped or triangular, preferably drop-shaped in this embodiment. The cross section is in the shape of water drops to create a beneficial flowing environment for lubricating oil, so that dry friction inside the bearing bush can be prevented, and cavitation erosion is further prevented.

Alternatively, in the embodiment of the present invention, the length direction of the groove 11 is the same direction or opposite direction to the spiral direction of the rocker shaft 3. I.e. the longest dimension (i.e. length) of the groove 11 extends in the circumferential direction of the rocker arm shaft 3, which ensures that the rocker arm shaft 3 is well lubricated during rotation. Of course, in other embodiments, the length direction of the groove 11 may also be set in the axial direction of the bushing body 1.

Preferably, in order to make rocking arm shaft 3 whether corotation or reversal all can be lubricated by the lubricating oil in recess 11, in this implementation, recess 11 is arranged the matrix, and the big end homodromous setting of every row of recess 11, namely the big end of every row of recess 11 all faces the same direction, and the tip all faces another direction, and the big end non-homodromous setting of two adjacent rows of recess 11, namely recess 11 sets up for the tip to the tip in the adjacent row, or the tip sets up to the tip, so, can guarantee that rocking arm shaft 3 all can be well lubricated when just reversing.

Optionally, in the present embodiment, the length of the maximum cross section of the groove 11 is 0.3mm-0.4mm, the width of the maximum cross section of the groove 11 is 0.15mm-2mm, and the depth of the groove 11 is 0.035mm-0.05 mm. So can guarantee to set up more recess 11 in the bush body 1, homoenergetic is saved lubricating oil in every recess 11 to improve the total memory space of lubricating oil.

Alternatively, in the present embodiment, the lubricant may flow out of the groove 11 with the rotation of the rocker shaft 3 when the rocker shaft 3 rotates, and particularly, when the direction from the small end to the large end is the same as the direction of the rocker shaft 3, the lubricant may flow out more and the groove 11 may not store enough lubricant, and for this reason, the protrusion 12 is provided at the notch at the large end of the groove 11. This serves the purpose of blocking most of the lubricant in the groove 11 and prevents more lubricant from flowing out of the groove 11.

Further, in the present embodiment, the protrusion 12 is also disposed at the notch of the transition connection between the large end of the groove 11 and the small end of the groove 11, that is, the protrusion 12 is not disposed at the notch of the small end of the groove 11, the protrusion 12 is disposed at other positions of the groove 11, and the shape of the cross section of the protrusion 12 is similar to or the same as that of the groove 11.

Optionally, the top wall of the protrusion 12 is higher than the notch of the groove 11. Of course, in other embodiments, the protrusion 12 may be parallel to the notch of the groove 11, and the purpose of blocking the lubricant from flowing out can also be achieved.

For the groove 11 processing in the present invention, it can be obtained by the particles 5 hitting the inner wall of the liner main body 1. In particular, the amount of the solvent to be used,

firstly, processing a convex column in the bushing, and then coating a layer of graphite powder on the inner wall of the bushing body 1; then clamping the lining material into a tool, bombarding and processing the groove 11 on the surface of the lining by using high-energy sprayed particles 5 through a spray head, wherein the particles 5 are incident on the inner wall of the lining body 1 at a certain angle, and the protrusion column is impacted to form the groove 11 and the protrusion 12, and the incident included angle is preferably 25-35 degrees, as shown in figure 4. Meanwhile, the linear displacement and the angular displacement of the nozzle are accurately controlled by the stepping motor, and the regularly arranged groove 11 array is obtained by sputtering. The surface graphite layer and possible residual particles 5 are then removed, resulting in a clean array of inner wall grooves 11 of the liner body 1.

Meanwhile, the bushing body 1 can also adopt a pulse laser to machine the groove 11 on the inner wall of the bushing body 1.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. The rocker arm bushing is characterized by comprising a bushing body (1), a groove area is arranged in a bearing area of the inner wall of the bushing body (1), a plurality of independent grooves (11) are arranged in the groove area, the cross sectional area of each groove (11) is gradually reduced from the inner wall of the bushing body (1) to the outer direction of the bushing body (1), a protrusion (12) is arranged on a notch of each groove (11), and the bearing area is an area where a rocker arm shaft (3) and the bushing body (1) are in contact under the condition of the maximum load of gas in an engine cylinder.

2. The rocker arm bushing as claimed in claim 1, wherein the cross-sectional shape of the recess (11) is drop-shaped or triangular.

3. The rocker arm bushing according to claim 2, wherein the recess (11) has a length which is in the same direction or opposite to the direction of rotation of the rocker arm.

4. The rocker arm bushing of claim 3, wherein the grooves (11) are arranged in a matrix arrangement, the large ends of each row of the grooves (11) being arranged in the same direction, and the large ends of two adjacent rows of the grooves (11) being arranged in different directions.

5. The rocker arm bushing according to claim 2, wherein the length of the largest cross-section of the groove (11) is 0.3-0.4 mm, the width of the largest cross-section of the groove (11) is 0.15-2 mm, and the depth of the groove (11) is 0.035-0.05 mm.

6. The rocker arm bushing as claimed in claim 1, wherein the projection (12) is provided at a notch at the large end of the recess (11).

7. The rocker arm bushing as claimed in claim 6, wherein the top wall of the projection (12) is higher than the slot opening of the recess (11).

8. The rocker arm bushing as claimed in claim 7, wherein the projection (12) is also arranged at the notch at the transition junction of the large end of the recess (11) and the small end of the recess (11).

9. An engine, characterized by comprising a rocker arm bushing as claimed in any one of claims 1-8.

10. A vehicle characterized by comprising the engine of claim 9.