阅读说明：本技术 一种适应于多种凸轮轴布置方式柴油机的新型进气门早关和晚关系统 (Novel early closing and late relation system of intake valve suitable for diesel engine with multiple camshaft arrangement modes ) 是由 张玉池 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种适应于多种凸轮轴布置方式柴油机的新型进气门早关和晚关系统,包括摇臂,所述摇臂固定于摇臂轴上,并围绕摇臂轴摆动,所述摇臂内设置有摇臂第一油路和摇臂第二油路；所述摇臂的另一端连接有凸轮轴动力机构。其中,所述凸轮轴动力机构为如下结构之一：第一种结构：包括侧置凸轮轴、推杆以及摇臂球头；第二种结构：包括顶置凸轮轴和摇臂滚子。本发明能够实现两种气门关闭定时,即可以在同一种结构上实现进气门正常关闭和早关,或者实现进气门正常关闭和晚关。(the invention discloses a novel early-closing and late-closing relation system of an intake valve of a diesel engine applicable to various camshaft arrangement modes, which comprises a rocker arm, wherein the rocker arm is fixed on a rocker arm shaft and swings around the rocker arm shaft, and a rocker arm first oil way and a rocker arm second oil way are arranged in the rocker arm; the other end of the rocker arm is connected with a camshaft power mechanism. The camshaft power mechanism is one of the following structures: the first structure is as follows: comprises a side camshaft, a push rod and a rocker arm ball head; the second structure is as follows: comprising an overhead camshaft and a rocker roller. The invention can realize the closing timing of two valves, namely, the normal closing and early closing of the intake valve can be realized on the same structure, or the normal closing and late closing of the intake valve can be realized.)

1. The utility model provides a be adapted to novel (air) intake valve early closing and late closing system of multiple camshaft arrangement mode diesel engine which characterized by: the rocker arm oil circuit comprises a rocker arm (4), wherein the rocker arm is fixed on a rocker arm shaft (6) and swings around the rocker arm shaft (6), a rocker arm first oil circuit (8) and a rocker arm second oil circuit (17) are arranged in the rocker arm, a rocker arm shaft first oil circuit (7) and a rocker arm shaft second oil circuit (5) are arranged in the rocker arm shaft (6), and the rocker arm first oil circuit (8) and the rocker arm second oil circuit (17) are respectively connected with the rocker arm shaft first oil circuit (7) and the rocker arm shaft second oil circuit (5); a piston cavity (9) and a spring cavity (11) which are communicated with each other are arranged in one end of the rocker arm, a stepped piston (10) is arranged in the piston cavity (9) in a sliding and sealing mode, the stepped piston (10) can move left and right in the piston cavity (9), one side end of the stepped piston (10) is formed into a wedge shape, the piston cavity (9) at the other end of the piston is connected with a first oil way (8) of the rocker arm, a first spring (12) is arranged in the spring cavity (11), and the wedge-shaped end of the stepped piston (10) is connected with one end of the first spring (12); a sliding cavity is formed in the rocker arm in the radial direction of the stepped piston (10), a sliding rod (14) is connected in the sliding cavity in a sliding and sealing mode, the lower end of the sliding rod (14) is connected with a valve bridge (15) and a valve (16), the upper end of the sliding rod is in contact with the stepped piston (10), and the sliding rod (14) can move up and down in the sliding cavity in the axial direction; the other end of the rocker arm is connected with a camshaft power mechanism.

2. The new type of intake valve early closing and late closing system for diesel engine with several cam shaft layout as claimed in claim 1, wherein:

One side of the sliding rod (14) is provided with a positioning pin (13) for limiting the up-down moving position of the sliding rod (14).

3. The new type of intake valve early closing and late closing system for diesel engine with several cam shaft layout as claimed in claim 1, wherein:

The rocker arm first oil way (8), the rocker arm shaft first oil way (7), the rocker arm second oil way (17) and the rocker arm shaft second oil way (5) are connected with a control system, the control system comprises a control system consisting of an ECU and a group of electromagnetic control valves, and the control system can control the pressure oil in the rocker arm shaft (6) to flow in and out from different oil ways, so that the working state of an engine valve (16) is switched.

4. the new type of intake valve early closing and late closing system for diesel engine with several cam shaft layout as claimed in claim 1, wherein:

The camshaft power mechanism is one of the following structures:

The first structure is as follows: the side camshaft comprises a side camshaft (1), a push rod (2) and a rocker ball head, wherein the side camshaft (1) is in contact with the lower end of the push rod (2), the upper end of the side camshaft is in contact with the rocker ball head, the contact surfaces of the side camshaft and the rocker ball head are a pair of spherical surfaces, and the rocker ball head is fixedly connected to a rocker;

the second structure is as follows: the camshaft adjusting mechanism comprises an overhead camshaft (19) and a rocker roller (18), wherein the overhead camshaft (19) is connected with the rocker roller (18), and the rocker roller (18) is fixed at one end of a rocker.

Technical Field

the invention relates to the technical field of variable valve structures of diesel engines, in particular to a novel early closing and late closing system of an intake valve, which is suitable for diesel engines with various camshaft arrangement modes.

Background

The variable valve of the diesel engine can meet the requirements of the engine on air quantity under different operating conditions, and the pumping loss is reduced. The early closing and the late closing of the intake valve can realize the Atkinson cycle and the Miller cycle, and can reduce the effective compression ratio and improve the heat efficiency. The variable valve can be used for reducing air inflow and improving exhaust temperature, the requirements of Europe six emission stages or stricter emission regulations on thermal management are met, and the application prospect is wide.

At present, reported variable valve systems of diesel engines mainly comprise early closing of an intake valve, late closing of the intake valve, early opening of an exhaust valve 1, variable lift of the intake valve and the exhaust valve, and the like, and most researches are carried out on the late closing of the intake valve and the early closing of the intake valve. With the continuous development and progress of the technology, the early closing and late closing system of the intake valve of the diesel engine is also continuously improved to achieve better use effect, and the invention provides the early closing and late closing system of the intake valve of the diesel engine, which is suitable for various cam shaft arrangement modes.

Disclosure of Invention

The invention aims to provide an intake valve early closing and late closing system of a diesel engine, which is suitable for various camshaft arrangement modes.

In order to achieve the purpose of the invention, the invention provides a novel early-closing and late-closing relation system of an intake valve, which is suitable for diesel engines with various camshaft arrangement modes, and comprises a rocker arm, wherein the rocker arm is fixed on a rocker arm shaft and swings around the rocker arm shaft, a first rocker arm oil way and a second rocker arm oil way are arranged in the rocker arm, a first rocker arm shaft oil way and a second rocker arm shaft oil way are arranged in the rocker arm shaft, and the first rocker arm oil way and the second rocker arm oil way are respectively connected with the first rocker arm shaft oil way and the second rocker arm shaft oil way; a piston cavity and a spring cavity which are communicated are arranged in one end of the rocker arm, a stepped piston is arranged in the piston cavity in a sliding and sealing mode and can move left and right in the piston cavity, a wedge-shaped end is formed at one side end of the stepped piston, the piston cavity at the other end of the piston is connected with a first oil path of the rocker arm, a spring is arranged in the spring cavity, and the wedge-shaped end of the stepped piston is connected with one end of the spring; a sliding cavity is arranged in the radial direction of the stepped piston in the rocker arm, a sliding rod is connected in the sliding cavity in a sliding and sealing mode, the lower end of the sliding rod is connected with the valve bridge and the valve, the upper end of the sliding rod is in contact with the stepped piston, and the sliding rod can move up and down in the sliding cavity in the axial direction; the other end of the rocker arm is connected with a camshaft power mechanism.

And one side of the sliding rod is provided with a positioning pin for limiting the up-and-down moving position of the sliding rod.

The control system comprises an ECU and a group of electromagnetic control valves, and can control the pressure oil in the rocker arm shaft to flow in and out from different oil passages, so that the working state of the engine valve is switched.

the camshaft power mechanism is one of the following structures:

The first structure is as follows: the rocker arm comprises a side camshaft, a push rod and a rocker arm ball head, wherein the side camshaft is in contact with the lower end of the push rod, the upper end of the side camshaft is in contact with the rocker arm ball head, the contact surfaces of the side camshaft and the rocker arm ball head are a pair of spherical surfaces, and the rocker arm ball head is fixedly connected to a rocker arm;

the second structure is as follows: the cam-type camshaft rocker mechanism comprises an overhead camshaft and a rocker roller, wherein the overhead camshaft is connected with the rocker roller, and the rocker roller is fixed at one end of a rocker.

Compared with the prior art, the invention has the beneficial effects that two valve closing timings can be realized, namely the normal closing and early closing of the intake valve can be realized on the same structure, or the normal closing and late closing of the intake valve can be realized.

Drawings

FIG. 1 is a schematic structural diagram of the present application;

Fig. 2 is a schematic structural view of a second camshaft power mechanism according to the present application;

FIG. 3 is a schematic view of the slide bar of the present application in its lowermost position;

FIG. 4 is a schematic view of the slide bar of the present application in its uppermost position; (ii) a

FIG. 5 is a schematic camshaft lift curve of the present application;

In the figure, 1-side camshaft, 2-push rod, 3-push arm ball head, 4-rocker arm, 5-rocker arm shaft second oil circuit, 6-rocker arm shaft, 7-rocker arm shaft first oil circuit, 8-rocker arm first oil circuit, 9-piston cavity, 10-stepped piston, 11-spring cavity, 12-first spring, 13-positioning pin, 14-sliding rod, 15-valve bridge, 16-valve, 17-rocker arm second oil circuit, 18-rocker arm roller, 19-overhead camshaft and 20-second spring.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

it is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.

it should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.