阅读说明：本技术 一种中心杆阀芯结构 (Center rod valve core structure ) 是由 陈华 肖泫岑 冯志文 于 2019-10-08 设计创作，主要内容包括：本发明揭露了一种中心杆阀芯结构,其包括：一中心杆和一阀芯,所述阀芯具有一通孔,所述通孔轴向贯通于所述阀芯,所述中心杆插入到所述阀芯的通孔中,使得所述中心杆和所述阀芯固定连接于一起；所述中心杆和所述阀芯的通孔之间的配合方式为过渡配合,从而使得所述中心杆和所述阀芯的通孔之间在装配的过程中达到较好的同心度。本发明公开的中心杆阀芯结构稳定牢固可靠,经试验验证后无失效现象发生,耐腐蚀性增强,重量和成本均有所降低。(The invention discloses a valve core structure of a center rod, which comprises: the valve core is provided with a through hole which axially penetrates through the valve core, and the central rod is inserted into the through hole of the valve core, so that the central rod and the valve core are fixedly connected together; the fit mode between the central rod and the through hole of the valve core is transition fit, so that the central rod and the through hole of the valve core achieve better concentricity in the assembling process. The valve core of the center rod disclosed by the invention has the advantages of stable, firm and reliable structure, no failure phenomenon after test verification, enhanced corrosion resistance and reduced weight and cost.)

1. A center rod spool structure, comprising: the valve core is provided with a through hole which axially penetrates through the valve core, and the central rod is inserted into the through hole of the valve core, so that the central rod and the valve core are fixedly connected together.

2. The center rod valve core structure according to claim 1, wherein the fit between the center rod and the through hole of the valve core is transition fit, so that a better concentricity between the center rod and the through hole of the valve core is achieved during assembly.

3. The central rod spool structure of claim 1 or 2, wherein the central rod has a central rod first end, a central rod intermediate member extending from the central rod first end, and a central rod second end extending from the central rod intermediate member.

4. The central rod spool structure of claim 3, wherein the outer diameter of the central rod first end is less than the outer diameter of the central rod middle piece, which is less than the outer diameter of the central rod second end.

5. The waveguide core rod spool structure of claim 4 wherein the waveguide rod is integrally formed.

6. The central rod spool structure of claim 4 wherein, upon assembly of the central rod to the spool, the central rod centerpiece of the central rod and the through bore of the spool coincide, the central rod second end of the central rod abutting against the outside of the through bore of the spool.

7. The waveguide valve core structure of claim 6 wherein the outer diameter of the waveguide valve core intermediate piece is 2mm larger than the through hole of the valve core, thereby providing the waveguide valve core with better strength and stability.

8. The central rod spool structure according to claim 6, wherein the height of the central rod middle piece is greater than the height of the through hole of the spool by 0.8mm when the central rod and the spool are assembled together, so as to facilitate caulking.

Technical Field

The invention relates to a control device of an engine exhaust gas recirculation system, in particular to a valve core structure of a central rod.

Background

In the working process of the electric EGR valve, after the motor reduces the speed and increases the torque through the reduction gear box, the rotary motion of the motor is converted into the linear motion of the valve rod through the eccentric wheel, so that the EGR valve is opened and closed. In the working process of the EGR valve, the valve core of the central rod plays a role in opening and closing the valve and controlling the flow of the valve. As a key part of the EGR valve, the stability and the safety of the valve core structure of the center rod play a great role.

The valve core structure of the center rod in the current market mainly has the following forms: the structure cost is low due to the fact that the laser welding mode is adopted between the center rod and the valve core, the laser welding manufacturability is unstable, and the failure mode of the EGR valve caused by falling of the laser welding is large in failure mode of the EGR valve.

Disclosure of Invention

In view of the above, the invention provides a valve core structure of a center rod, which has a stable, firm and reliable structure, does not have failure phenomenon after test verification, has enhanced corrosion resistance, and reduces weight and cost.

In order to achieve the above object, the present invention provides a center rod spool structure including: the valve core is provided with a through hole which axially penetrates through the valve core, and the central rod is inserted into the through hole of the valve core, so that the central rod and the valve core are fixedly connected together.

Furthermore, the fit mode between the central rod and the through hole of the valve core is transition fit, so that the central rod and the through hole of the valve core achieve better concentricity in the assembling process.

Further, the center rod has a center rod first end, a center rod middle member extending from the center rod first end, and a center rod second end extending from the center rod middle member.

Further, the outer diameter of the first end of the central rod is smaller than the outer diameter of the central rod middle piece, and the outer diameter of the central rod middle piece is smaller than the outer diameter of the second end of the central rod.

Further, the center rod is integrally formed.

Further, when the center rod is assembled to the spool, the center rod intermediate piece of the center rod and the through hole of the spool coincide, and the center rod second end of the center rod abuts against the outside of the through hole of the spool.

Further, the central rod middle piece and the through hole of the valve core are in transition fit, that is, the outer diameter of the second end of the central rod is larger than the inner diameter of the through hole of the valve core. Thus, when the center rod and the valve element are assembled together, the center rod second end of the center rod abuts against the valve element for holding the valve element.

Further, the outer diameter of the center rod middle piece is 2mm larger than the through hole of the valve core, so that the center rod valve core has better strength and stability.

Further, when the center rod and the valve core are assembled together, the height of the center rod middle piece is larger than that of the through hole of the valve core, so that riveting is facilitated.

Further, when the central rod and the valve core are assembled together, the height of the central rod middle piece is 0.8mm greater than that of the through hole of the valve core, so that riveting is facilitated.

Furthermore, in order to enable the central rod to be capable of guiding and smoothly transiting in the process of assembling with the EGR valve body, and to facilitate installation without damaging related parts on the EGR valve, a chamfer is arranged at one end, deviating from the central rod middle piece, of the first end of the central rod.

Further, the chamfer distance of the chamfer is 1.5mm, which is marked as C1.5. The chamfer has a first point portion and second point portion, first point portion with the second point portion is provided with the fillet that the radius is 0.5mm, marks as R0.5.

Compared with the prior art, the invention has the following advantages:

the valve core of the center rod provided by the invention has a stable, firm and reliable structure, and has no failure phenomenon after being verified by an engine combined environment vibration test;

the center rod and the valve core are both made of stainless steel 304, so that the corrosion resistance is improved, and the service life of the EGR valve is prolonged;

the elasticity is enhanced after the thickness of the valve core is reduced, the sealing performance of the EGR valve is improved, meanwhile, the weight and the cost are reduced, the product percent of pass of the valve is improved, and the service life of the valve is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a valve core structure of a center rod according to the present invention;

fig. 2 is a schematic structural view of a valve core structure of a center rod according to the present invention;

fig. 3 is a schematic structural diagram of a center rod of a center valve core structure provided by the invention;

fig. 4 is a schematic structural diagram of a valve core of a center rod valve core structure according to the present invention.

Detailed Description

The technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

It is to be understood that the described embodiments are merely some embodiments and not all embodiments of the present application, and that the following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application and its applications.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or all manner of connections; "coupled" may be direct or indirect through an intermediary. The terms "upper", "lower", and the like indicate orientations or positional relationships based on the manner or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific orientation, be constructed and operated in a specific orientation. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 and 2, there are shown schematic structural views of a center rod valve core according to the present invention. As can be seen from the figure, the center rod valve core a includes a center rod 1 and a valve core 2, the valve core 2 has a through hole 21, the through hole 21 axially penetrates through the valve core 2, and the center rod 1 is inserted into the through hole 21 of the valve core 2, so that the center rod 1 and the valve core 2 are fixedly connected together.

Specifically, the fit mode between the central rod 1 and the through hole 21 of the valve core 2 is transition fit, so that the central rod 1 and the through hole 21 of the valve core 2 achieve better concentricity in the assembling process.

The center pole has a center pole first end 11, a center pole middle piece 12 extending from the center pole first end 11, and a center pole second end 13 extending from the center pole middle piece 12.

Specifically, the outside diameter of the center rod first end 11 is smaller than the outside diameter of the center rod middle piece 12, and the outside diameter of the center rod middle piece 12 is smaller than the outside diameter of the center rod second end 13. The center rod 1 is integrally formed.

As shown in fig. 1, when the center rod 1 is assembled to the spool 2, the center rod middle piece 12 of the center rod 1 and the through hole 12 of the spool coincide, and the center rod second end 13 of the center rod 1 abuts against the outside of the through hole 21 of the spool 2.

Specifically, the central rod intermediate member 2 and the through hole 21 of the valve element 2 are transition fitted, that is, the outer diameter of the central rod second end 13 is larger than the inner diameter of the through hole of the valve element 2. Thus, when the center rod 1 and the spool 2 are assembled together, the center rod second end 13 of the center rod 1 abuts against the spool 2 for holding the spool 2.

Specifically, the outer diameter of the center rod intermediate member 2 is 2mm larger than the through hole 21 of the spool, so that the center rod spool a has superior strength and stability.

It is noted that when the center rod 1 and the valve element 2 are assembled together, the height of the center rod intermediate member 12 is greater than the height of the through hole 21 of the valve element 2, so as to facilitate caulking.

More specifically, when the center rod 1 and the valve element 2 are assembled together, the height of the center rod intermediate member 12 is 0.8mm greater than the height of the through hole 21 of the valve element 2, so as to facilitate caulking.

Fig. 3 is a schematic structural diagram of a core structure of a center rod according to the present invention. As can be seen from the figure, in order to enable the central rod 1 to have guiding and smooth transition in assembly with the EGR valve body, and to facilitate installation without damaging related parts on the EGR valve, a chamfer 111 is provided at an end of the central rod first end 11 of the central rod 1 that is away from the central rod middle piece 12.

Specifically, the chamfer 111 has a chamfer distance of 1.5mm, denoted as C1.5. The chamfer 111 has a first tip 1111 and a second tip 1112, and the second tip 1112 and the first tip 1111 are provided with a fillet with a radius of 0.5mm, denoted as R0.5.

Fig. 4 is a schematic structural diagram of a valve core of a center rod valve core structure according to the present invention. As can be seen from the figure, since the valve body 2 of the center rod valve body a is slightly deformed under severe environments such as high temperature, high pressure, and high vibration during the operation of the EGR valve, in order to make the amount of oil leakage smaller as the center rod valve body a and the EGR valve body are fitted closer, the thickness of the valve body 2 of the center rod valve body a is reduced as much as possible while satisfying the necessary fitting dimension with the center rod 1, so that the stability and reliability of the EGR valve can be improved, and the weight and material cost of the valve body 2 can be reduced.

Further, in order to adapt to a severe working environment for a long time and improve corrosion resistance, the central rod 1 and the valve core 2 of the central rod valve core a are made of stainless steel 304.

Compared with the prior art, the invention has the following advantages:

1. the valve core of the center rod provided by the invention has a stable, firm and reliable structure, and has no failure phenomenon after being verified by an engine combined environment vibration test;

2. the center rod and the valve core are both made of stainless steel 304, so that the corrosion resistance is improved, and the service life of the EGR valve is prolonged;

3. the elasticity is enhanced after the thickness of the valve core is reduced, the sealing performance of the EGR valve is improved, meanwhile, the weight and the cost are reduced, the product percent of pass of the valve is improved, and the service life of the valve is prolonged.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.