阅读说明：本技术 一种柴油机滚轮挺柱 (Diesel engine roller tappet ) 是由 韩乐 季永会 胡玮 王志磊 安黔君 于 2020-06-22 设计创作，主要内容包括：本发明公开了一种柴油机滚轮挺柱,包括机体和衬套,所述机体内设置有挺柱体,所述挺柱体上设置有止推块,止推块的上端与推杆紧靠设置,所述止推块与挺柱体过盈配合,所述衬套外侧面设置有滚轮,所述滚轮和衬套组成的转动机构通过定位轴与挺柱体固定连接,所述定位轴的一侧通过定位螺钉与挺柱体固定连接,本柴油机滚轮挺柱上的第一油道和第二油道均采用竖直通孔,加工简单,节约了生产成本,定位轴一端的矩形定位凸台有效防止工作过程中挺柱体旋转,定位简单,使用可靠,定位轴通过定位螺钉定位于挺柱体上,定位准确可靠,提高装配的精确性。(The invention discloses a diesel engine roller tappet which comprises a machine body and a bushing, wherein a tappet body is arranged in the machine body, a thrust block is arranged on the tappet body, the upper end of the thrust block is arranged to be abutted against a push rod, the thrust block is in interference fit with the tappet body, a roller is arranged on the outer side surface of the bushing, a rotating mechanism consisting of the roller and the bushing is fixedly connected with the tappet body through a positioning shaft, one side of the positioning shaft is fixedly connected with the tappet body through a positioning screw, a first oil duct and a second oil duct on the diesel engine roller tappet both adopt vertical through holes, the processing is simple, the production cost is saved, a rectangular positioning boss at one end of the positioning shaft effectively prevents the tappet body from rotating in the working process, the positioning is simple and reliable to use, the positioning shaft is positioned on the tappet body through the positioning screw, the positioning is accurate and reliable, and.)

1. The utility model provides a diesel engine gyro wheel tappet, includes organism (1) and bush (5), be provided with tappet body (2) in organism (1), be provided with thrust block (3) on tappet body (2), the upper end and push rod (15) of thrust block (3) are near setting up its characterized in that: the thrust block (3) is in interference fit with the tappet body (2), the outer side face of the bushing (5) is provided with a roller (4), a rotating mechanism formed by the roller (4) and the bushing (5) is fixedly connected with the tappet body (2) through a positioning shaft (6), and one side of the positioning shaft (6) is fixedly connected with the tappet body (2) through a positioning screw (7).

2. The diesel roller tappet according to claim 1, wherein: the tappet body (2) is provided with a thrust block mounting hole (8), a positioning shaft mounting hole (9), a first oil duct (10), a second oil duct (11), an oil cavity (12), a first positioning screw mounting hole (13) and an oil storage groove (14), wherein the thrust block mounting hole (8), the positioning shaft mounting hole (9) and the first positioning screw mounting hole (13) are correspondingly arranged with the thrust block (3), the positioning shaft (6) and the positioning screw (7).

3. The diesel roller tappet according to claim 2, wherein: the number of the first oil ducts (10) is two, the two first oil ducts (10) are symmetrically arranged on the tappet body (2), and the first oil ducts (10) and the second oil ducts (11) adopt vertical through hole structures.

4. The diesel roller tappet according to claim 1, wherein: the upper top surface of the thrust block (3) is a semi-arc surface, and the lower part of the thrust block is a cylinder.

5. The diesel roller tappet according to claim 1, wherein: the roller (4) is of a cylindrical hollow structure, and a hemispherical groove is formed in the edge of the roller (4).

6. The diesel roller tappet according to claim 1, wherein: the bushing (5) is of a cylindrical hollow structure and made of wear-resistant materials, and the middle of the bushing (5) is provided with an oil hole (18) and a third oil duct (19).

7. The diesel roller tappet according to claim 1, wherein: the positioning shaft (6) is of a cylindrical structure, an oil groove (17) and a second positioning screw mounting hole (20) are formed in the positioning shaft (6), and a rectangular positioning boss (16) is arranged at one end of the positioning shaft (6).

Technical Field

The invention relates to the technical field of internal combustion engines, in particular to a roller tappet of a diesel engine.

Background

The diesel engine valve transmission mechanism mainly comprises a tappet, a push rod and a rocker arm. In the working process of the diesel engine, the tappet is used for transmitting the motion of the cam to the push rod from the cam shaft, so that the opening and closing of the air inlet and outlet valve are realized, and the air distribution timing of the diesel engine is ensured.

A roller tappet (201220045223.6) comprises a tappet body, wherein the upper end of the tappet body is provided with a tappet inner cavity, the bottom end of the tappet body is provided with a roller groove, the roller groove is provided with a roller through a pin shaft and is provided with a limiting block for limiting the axial displacement of the roller, and the tappet inner cavity is provided with a side through hole and an inclined oil hole for lubricating the surface of the roller and the surface of the tappet. According to the scheme, the side through hole and the inclined oil hole are machined in the inner cavity of the tappet, machining difficulty is high, production cost is increased, the contact surface of the roller and the cam can only be lubricated, lubrication between the roller and the pin shaft cannot be guaranteed, and dry friction is easily generated to cause the roller to be blocked; the push rod is in direct contact with the surface of the inner cavity of the tappet, so that the surface of the roller tappet is easily abraded, the parts are more, the installation is complex, and the use is unreliable.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the existing defects and provide the roller tappet of the diesel engine, the device has reasonable part structure layout, small part machining difficulty and good lubrication precision of a friction pair, and the tappet is internally provided with a thrust block and a push rod to form the friction pair, so that the tappet is prevented from being directly contacted with the push rod, the roller is prevented from being clamped, and the problems in the background technology can be effectively solved.

In order to achieve the purpose, the invention provides the following technical scheme: a roller tappet of a diesel engine comprises a machine body and a bushing, wherein a tappet body is arranged in the machine body, a thrust block is arranged on the tappet body, the upper end of the thrust block is arranged close to a push rod, the thrust block is in interference fit with the tappet body, a roller is arranged on the outer side surface of the bushing, a rotating mechanism consisting of the roller and the bushing is fixedly connected with the tappet body through a positioning shaft, and one side of the positioning shaft is fixedly connected with the tappet body through a positioning screw.

As a preferred technical solution of the present invention, the tappet body is provided with a thrust block mounting hole, a positioning shaft mounting hole, a first oil passage, a second oil passage, an oil cavity, a first positioning screw mounting hole, and an oil storage groove, and the thrust block mounting hole, the positioning shaft mounting hole, and the first positioning screw mounting hole are disposed corresponding to the thrust block, the positioning shaft, and the positioning screw.

As a preferred technical scheme of the present invention, the number of the first oil passages is two, the two first oil passages are symmetrically disposed on the tappet body, and the first oil passage and the second oil passage adopt a vertical through hole structure.

As a preferable technical scheme of the invention, the upper top surface of the thrust block is a semicircular arc surface, and the lower part of the thrust block is a cylinder.

As a preferred technical scheme of the invention, the roller adopts a cylindrical hollow structure, and the edge of the roller is provided with a hemispherical groove.

As a preferable technical scheme of the invention, the bushing is of a cylindrical hollow structure and made of wear-resistant materials, and the middle part of the bushing is provided with the oil hole and the third oil duct.

As a preferred technical scheme of the invention, the positioning shaft is of a cylindrical structure, the positioning shaft is provided with an oil passing groove and a second positioning screw mounting hole, and one end of the positioning shaft is provided with a rectangular positioning boss.

Compared with the prior art, the invention has the beneficial effects that: this first oil duct and second oil duct on the diesel engine gyro wheel tappet all adopt vertical through-hole, processing is simple, and production cost is saved, simultaneously through the second oil duct, oil pocket and oil groove pair gyro wheel and bush, bush and location axle, the tappet body carries out the accuracy lubrication with the organism, improve lubricated effect, the rectangle location boss of location axle one end effectively prevents that the tappet body is rotatory in the course of the work, the location is simple, use reliably, the location axle is positioned on the tappet body through set screw, the location is accurate reliable, the accuracy nature of assembly is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a tappet body;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a sectional view taken along line B-B of FIG. 2;

FIG. 5 is a schematic view of a stop block structure;

FIG. 6 is a schematic view of a roller structure;

FIG. 7 is a schematic view of a bushing configuration;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

FIG. 9 is a sectional view taken along line B-B of FIG. 7;

FIG. 10 is a schematic view of a positioning shaft;

FIG. 11 is a sectional view taken along line A-A of FIG. 10;

FIG. 12 is a left side view of the positioning shaft;

fig. 13 is a schematic view of a positioning screw structure.

In the figure: the oil cylinder positioning device comprises a machine body 1, a tappet body 2, a thrust block 3, a roller 4, a bushing 5, a positioning shaft 6, a positioning screw 7, a thrust block mounting hole 8, a positioning shaft mounting hole 9, a first oil duct 10, a second oil duct 11, an oil chamber 12, a first positioning screw mounting hole 13, an oil storage groove 14, a push rod 15, a rectangular positioning boss 16, an oil passing groove 17, an oil hole 18, a third oil duct 19 and a second positioning screw mounting hole 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments (for convenience of description and understanding, the upper side of fig. 1 is described as the upper side below). All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-13, the present invention provides a technical solution: a diesel engine roller tappet comprises a machine body 1 and a bushing 5, wherein the bushing 5 is used for avoiding a roller 4 from directly contacting with a positioning shaft 6 and prolonging the service life of a tappet body 2, the bushing 5 is of a cylindrical hollow structure and is made of wear-resistant materials, an oil hole 18 and a third oil duct 19 are arranged in the middle of the bushing 5, the tappet body 2 is arranged in the machine body 1, the tappet body 2 is contacted with a push rod 15 in a valve transmission mechanism through a thrust block 3 and avoids abrasion caused by direct contact of the push rod 15 and the surface of the tappet body 2, the tappet body 2 is provided with a thrust block mounting hole 8, a positioning shaft mounting hole 9, a first oil duct 10, a second oil duct 11, an oil cavity 12, a first positioning screw mounting hole 13 and an oil storage groove 14, the thrust block mounting hole 8, the positioning shaft mounting hole 9 and the first positioning screw mounting hole 13 are arranged corresponding to the thrust block 3, the positioning shaft 6 and the positioning screw 7, the oil lubrication device comprises a tappet body 2, a first oil passage 10, a bushing 5, a positioning shaft 6, a first oil passage 10, a second oil passage 11, a roller 4, an oil cavity 12 and an oil groove 17, wherein the first oil passage 10 and the second oil passage 11 are both of a vertical through hole structure, the processing is simple, the lubrication between the roller 4, the bushing 5, the positioning shaft 6 and the tappet body 2 and the machine body 1 directly introduces engine oil through the second oil passage 11, the oil cavity 12 and the oil groove 17, the lubrication is accurate and reliable, the oil groove 14 is introduced to the outer side surface of the roller 4 through the first oil passage 10, the outer side surface of the roller 4 is lubricated, the tappet body 2 is provided with a thrust block 3, the upper top surface of the thrust block 3 is a semi-arc surface, the lower part of the thrust block 3 is a cylinder, the upper end of the thrust block 3 is arranged close to a push rod 15, the thrust block 3 is in interference fit with the, the spherical groove at the edge of the roller 4 effectively reduces the residual stress in the roller 4 and prevents the surface deformation of the roller 4, the rotating mechanism consisting of the roller 4 and the bush 5 is fixedly connected with the tappet body 2 through the positioning shaft 6, the positioning shaft 6 is of a cylindrical structure, the positioning shaft 6 is provided with the oil groove 17 and the second positioning screw mounting hole 20, one end of the positioning shaft 6 is provided with the rectangular positioning boss 16, the rectangular positioning boss 16 prevents the tappet body 2 from rotating in the working process, the positioning is simple and reliable to use, one side of the positioning shaft 6 is fixedly connected with the tappet body 2 through the positioning screw 7, the positioning screw 7 positions the positioning shaft 6 on the tappet body 2, the positioning is accurate and reliable, the device is accurate in lubrication and reliable in mounting and positioning, and the use reliability is improved.

When in use: the thrust block 3 is arranged on the tappet body 2 in an interference fit manner, the roller 4 and the bushing 5 are arranged on the tappet body 2 in a clearance fit manner through a positioning shaft 6, and the positioning shaft 6 is fixed on the tappet body 2 through a positioning screw 7; the tappet body 2 is connected with the machine body 1 through a positioning boss 16 at one end of a positioning shaft 6; during the operation of the diesel engine, the engine oil in the oil storage tank 14 flows to a friction pair formed by the roller 4 and the bush 5, a friction pair formed by the bush 5 and the positioning shaft 6, and a friction pair formed by the tappet body 2 and the engine body 1 through the second oil passage 11, the oil cavity 12 and the oil passing groove 17 to lubricate.

The tappet body 2 is safe and reliable to use, the service life and the maintenance period of the tappet body 2 can be effectively prolonged, the spherical groove at the edge of the roller 4 effectively reduces the residual stress inside the roller 4, the surface deformation of the roller 4 is prevented, the tappet body 2 is in contact with the push rod 15 in the valve transmission mechanism through the thrust block 3, and the abrasion caused by the direct contact of the push rod 15 and the surface of the tappet body 2 is avoided.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.