CN217712710U

CN217712710U - Rocker arm mechanism of small general-purpose engine

Info

Publication number: CN217712710U
Application number: CN202221868632.6U
Authority: CN
Inventors: 王吉; 米红湖; 李东虎; 陆仕兵
Original assignee: Chongqing Dile Jinchi General Machinery Co ltd
Current assignee: Chongqing Dile Jinchi General Machinery Co ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-11-01
Anticipated expiration: 2032-07-20

Abstract

The utility model relates to a general mechanical engine technical field especially relates to a rocker mechanism of small-size general-purpose engine. The utility model discloses a rocker mechanism of small-size general-purpose engine, including the rocking arm seat, install the inlet and outlet rocking arm through the rocking arm axle on the rocking arm seat, one side of rocking arm axle is equipped with limit stop, and the top of rocking arm seat is close to one side of limit stop is equipped with the installation inclined plane. The technical problem solved by the utility model is to provide a can reduce rocking arm seat atress and improve lubricated small-size general purpose engine's rocking arm mechanism.

Description

Rocker arm mechanism of small general-purpose engine

Technical Field

The utility model relates to a general mechanical engine technical field especially relates to a rocker mechanism of small-size general-purpose engine.

Background

In recent years, small general-purpose engines have been developed at a high speed, and the performance of general-purpose engines has been increasingly demanded. The valve rocker is an indispensable and important component of an engine, and is mounted on an engine block to control the intake and exhaust of a valve by the reciprocating rotation of the rocker about a rocker shaft. However, under the high-speed operation of the engine, the rocker shaft also rotates in the rocker shaft hole at a high speed, great sliding friction resistance is generated between the rocker shaft and the rocker shaft hole, the performance of the engine is reduced, and the abrasion between the rocker shaft and the rocker shaft hole is very easy, so that the service life of the engine is shortened. Meanwhile, in the existing rocker arm running mechanism of the general engine, because the lower-mounted cam pushes the rocker arm through the tappet rod and the inclined valve is added, the transmission force is continuously in a deflection state, the lubricating effect is poor and the impact force is directly applied in continuous impact and cold and heat changes, and the problems of breakage of the upper part of the rocker arm seat and serious abrasion or eccentric wear of the rocker arm shaft and the rocker arm shaft hole are frequently caused.

Accordingly, those skilled in the art have endeavored to develop a rocker arm mechanism for a small general-purpose engine that reduces the force on the rocker arm seat and improves lubrication.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the utility model discloses a rocker arm mechanism of small-size general-purpose engine, the technical problem that solve reduce rocking arm seat atress and improve lubrication.

In order to achieve the purpose, the utility model provides a small-size rocker mechanism of general gasoline engine, including the rocking arm seat, install the inlet and outlet rocking arm through the rocking arm axle on the rocking arm seat, one side of rocking arm axle is equipped with limit stop, and the top of rocking arm seat is close to one side of limit stop is equipped with the installation inclined plane.

Preferably, the utility model provides a pair of small-size general-purpose aircraft engine's rocker mechanism still includes the cylinder body, the top of cylinder body is equipped with the installation rocker arm seat and limit stop's installation cavity.

Preferably, the rocker arm seat comprises a first mounting surface and a second mounting surface, the mounting inclined surface is arranged on the first mounting surface, and the included angle theta between the mounting inclined surface and the first mounting surface is 8-12 degrees.

Preferably, the air inlet and exhaust rocker arm comprises a rocker arm body, mounting flanges are arranged on two sides of the rocker arm body, shaft holes matched with the rocker arm shaft are formed in the mounting flanges, and the rocker arm body and the two mounting flanges are erected on the rocker arm seat through the rocker arm shaft.

Preferably, the distance A between the rocker arm shaft and the limit stop is 0.25-0.4 mm.

Preferably, the distance B between the second mounting surface and the mounting flange is 0.5-0.6 mm.

Preferably, the included angle α between the first mounting surface and the cylinder is 65 to 80 °.

Preferably, the limit stop comprises a mounting portion, two sides of the mounting portion extend upwards to form limit portions, and each limit portion corresponds to the rocker shaft respectively.

Preferably, still be equipped with support column and stopper in the cylinder body, fix on the support column the installation department is equipped with on the installation department with stopper complex spacing recess.

Preferably, one end of the rocker arm body is provided with a mounting screw, and the other end of the rocker arm body is provided with a balancing weight.

The utility model has the advantages that:

through the improvement of the rocker arm seat and the utilization of the limiting block, the intake and exhaust rocker arms have more uniform force unloading, more sufficient lubrication and more uniform abrasion, and the impact on the rocker arm seat is greatly reduced. After the engine runs, the cam pushes the air inlet and outlet rocker arm through the tappet push rod, and when the air inlet and outlet rocker arm moves up and down, the up-and-down acting force can generate component force along the installation inclined plane due to the installation inclined plane, so that the rocker arm shaft can be driven to displace along the direction of the stop block and impact the limiting stop block. At the moment, the two mounting flanges of the rocker arm are matched with the rocker arm to suspend in the air, so that impact is not generated on the second mounting surface of the rocker arm seat, the rocker arm shaft can rotate better, most impact force generated by structural deflection is transferred to the limiting stop block, and a small part of impact force is transferred to the rocker arm rotation and the top of the rocker arm seat respectively. Meanwhile, under the condition that the rocker arm seat is provided with the installation inclined plane and the installation flanging is suspended, under the action of air pressure, oil mist can be accumulated on the installation inclined plane and reaches the rocker arm shaft through the suspended gap, and the rocker arm shaft are quickly lubricated, so that abrasion between the rocker arm shaft and the through hole of the rocker arm seat is reduced. The impact force which is applied to the rocker arm seat is reasonably distributed, and meanwhile, the effects of improving lubrication and prolonging the service life of the mechanism are achieved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a rocker arm seat according to an embodiment of the present invention;

FIG. 3 is a schematic side view of a rocker arm seat according to an embodiment of the present invention;

FIG. 4 is a schematic side view of an installation of an embodiment of the present invention;

FIG. 5 is a schematic view of an intake and exhaust rocker arm according to an embodiment of the present invention;

fig. 6 is a schematic view of a bump stopper according to an embodiment of the present invention.

In the above drawings: 1. a rocker arm seat; 11. a first mounting surface; 111. installing an inclined plane; 12. a second mounting surface; 2. a rocker shaft; 3. an intake and exhaust rocker arm; 31. a rocker arm body; 311. mounting screws; 312. a balancing weight; 32. installing a flanging; 4. a limit stop block; 41. an installation part; 411. a limiting groove; 42. a limiting part; 5. a cylinder body; 51. a mounting cavity; 6. a support pillar; 7. and a limiting block.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein it is noted that, in the description of the invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, 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 manner, and therefore should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in FIG. 1, the utility model provides a rocker arm mechanism of small general gasoline engine, including cylinder body 5, the top of cylinder body 5 is equipped with installation cavity 51. Two rocker arm seats 1 are arranged in the mounting cavity 51, and an air inlet and exhaust rocker arm 3 is mounted on each rocker arm seat 1 through a rocker arm shaft 2. A limit stop 4 is arranged between the two air inlet and exhaust rocker arms 3, the position of the limit stop 4 corresponds to one side of the rocker shaft 2, and the limit stop 4 is used for limiting the rocker shaft 2.

As shown in fig. 2 and 3, the rocker arm seat 1 includes a first mounting surface 11 and a second mounting surface 12, the first mounting surface 11 is located on a side close to the limit stop 4, an included angle α between the first mounting surface 11 and the cylinder 5 is 65 to 80 °, and in the present embodiment, the included angle α between the first mounting surface 11 and the cylinder 5 is 72 °. Meanwhile, the top of the first mounting surface 11 is provided with a mounting inclined surface 111, and the axial center line of the rocker arm shaft 2 is perpendicular to the mounting inclined surface 111 when the rocker arm shaft is mounted. Specifically, the included angle θ between the installation inclined surface 111 and the first installation surface 11 is 8 to 12 °, and in the present embodiment, the included angle θ between the installation inclined surface 111 and the first installation surface 11 is 8 °.

As shown in fig. 4 to 5, the intake and exhaust rocker arm 3 includes a rocker arm body 31, mounting flanges 32 are provided on both sides of the rocker arm body 31, a shaft hole matched with the rocker arm shaft 2 is provided on the mounting flanges 32, and the rocker arm body 31 and the two mounting flanges 32 are erected on the rocker arm base 1 through the rocker arm shaft 2. Specifically, the distance a between the rocker shaft 2 and the limit stop 4 is 0.25 to 0.4mm in this embodiment, the distance a between the rocker shaft 2 and the limit stop 4 is 0.25mm; the distance B between the second mounting surface 12 and the mounting flange 32 is 0.5-0.6 mm, and in the embodiment, the distance B between the second mounting surface 12 and the mounting flange 32 is 0.5mm. In addition, one end of the rocker arm body 31 is provided with a mounting screw 311 for connecting with the push rod, and the other end is provided with a weight block 312.

In the embodiment, the rocker arm seat 1 is improved and the limit stop 4 is utilized, so that the air inlet and exhaust rocker arms 3 are more uniform in force unloading, more sufficient in lubrication and more uniform in abrasion, and the impact on the rocker arm seat 1 is greatly reduced. After the engine runs, the cam pushes the intake and exhaust rocker arm 3 through the tappet push rod, and when the intake and exhaust rocker arm 3 goes up and down, due to the arrangement of the installation inclined surface 111, the upward and downward acting force can generate component force along the installation inclined surface 111, so that the rocker arm shaft 2 can be driven to displace along the direction of the stop block and impact the limit stop 4. At this time, the two mounting flanges 32 of the intake and exhaust rocker arm 3 are matched with the intake and exhaust rocker arm 3 to suspend in the air, so that no impact is generated on the second mounting surface 12 of the rocker arm seat 1 any more, but the rocker arm shaft 2 can better generate autorotation, thereby transferring most impact force generated by structural deflection to act on the limit stop 4, and transferring a small part of impact force to the autorotation of the intake and exhaust rocker arm 3 and the top of the rocker arm seat 1 respectively. Meanwhile, under the suspended state of the rocker arm seat 1 provided with the installation inclined plane 111 and the installation flanging 32, oil mist is accumulated on the installation inclined plane 111 under the action of air pressure and reaches the rocker arm shaft 2 through the suspended gap, and the air inlet and outlet rocker arms 3 and the rocker arm shaft 2 are quickly lubricated, so that the abrasion between the rocker arm shaft 2 and the through hole of the rocker arm seat 1 is reduced. The impact force which is applied to the rocker arm seat 1 is reasonably distributed, and meanwhile, the effects of improving lubrication and prolonging the service life of the mechanism are achieved.

As shown in fig. 6 and 2, the limit stopper 4 includes a mounting portion 41, and limit portions 42 extend upward from both sides of the mounting portion 41, each of the limit portions 42 corresponding to the rocker shaft 2, respectively. Still be equipped with support column 6 and stopper 7 in the cylinder body 5, be equipped with the fixed orifices of fixed mounting portion 41 on the support column 6, be equipped with on the installation department 41 with stopper 7 complex spacing recess 411, it is specific, stopper 7's cross-section is the T shape, stopper 7 card is gone into in spacing recess 411 for restrict stopper 7's displacement.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention by those skilled in the art should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a rocking arm mechanism of small-size general-purpose engine which characterized in that: the rocker arm base comprises a rocker arm base (1), wherein an air inlet and exhaust rocker arm (3) is mounted on the rocker arm base (1) through a rocker arm shaft (2), a limit stop (4) is arranged on one side of the rocker arm shaft (2), and a mounting inclined plane (111) is arranged on one side, close to the limit stop (4), of the top of the rocker arm base (1).

2. The rocker arm mechanism of a small general-purpose engine as set forth in claim 1, wherein: the rocker arm base is characterized by further comprising a cylinder body (5), and a mounting cavity (51) for mounting the rocker arm base (1) and the limit stop (4) is formed in the top of the cylinder body (5).

3. The rocker arm mechanism of a small general-purpose engine as set forth in claim 2, wherein: the rocker arm seat (1) comprises a first mounting surface (11) and a second mounting surface (12), wherein a mounting inclined surface (111) is arranged on the first mounting surface (11), and the included angle theta between the mounting inclined surface (111) and the first mounting surface (11) is 8-12 degrees.

4. A rocker arm mechanism for a small general-purpose engine as defined in claim 3, wherein: the air inlet and exhaust rocker arm (3) comprises a rocker arm body (31), mounting flanges (32) are arranged on two sides of the rocker arm body (31), shaft holes are formed in the mounting flanges (32), and the rocker arm body (31) and the two mounting flanges (32) are erected on the rocker arm seat (1).

5. The rocker arm mechanism of a small general-purpose engine as set forth in claim 4, wherein: the distance A between the rocker arm shaft (2) and the limit stop (4) is 0.25-0.4 mm.

6. The rocker arm mechanism of a small general-purpose engine as set forth in claim 5, wherein: the distance B between the second mounting surface (12) and the mounting flange (32) is 0.5-0.6 mm.

7. A rocker arm mechanism of a small general-purpose engine as set forth in claim 3, wherein: the included angle alpha between the first mounting surface (11) and the cylinder body (5) is 65-80 degrees.

8. The rocker arm mechanism of a small general-purpose engine as set forth in claim 5, wherein: the limit stop (4) comprises an installation part (41), two sides of the installation part (41) extend upwards to form limit parts (42), and each limit part (42) corresponds to the rocker arm shaft (2) respectively.

9. The rocker arm mechanism of a small general-purpose engine as set forth in claim 8, wherein: still be equipped with support column (6) and stopper (7) in cylinder body (5), support column (6) are gone up fixedly installation department (41), be equipped with on installation department (41) with stopper (7) complex spacing recess (411).

10. The rocker arm mechanism of a small general-purpose engine as set forth in claim 4, wherein: one end of the rocker arm body (31) is provided with a mounting screw (311), and the other end is provided with a balancing weight (312).