CN210660401U - Fuel injector assembly pressing device - Google Patents
Fuel injector assembly pressing device Download PDFInfo
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- CN210660401U CN210660401U CN201921622228.9U CN201921622228U CN210660401U CN 210660401 U CN210660401 U CN 210660401U CN 201921622228 U CN201921622228 U CN 201921622228U CN 210660401 U CN210660401 U CN 210660401U
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- fuel injector
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- threaded sleeve
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Abstract
The utility model discloses a sprayer assembly closing device, the bilateral symmetry that the sprayer assembly is relative are equipped with the draw-in groove, and the sprayer assembly is fixed in the cylinder head, and sprayer assembly closing device includes: the oil sprayer comprises a horseshoe-shaped pressing block, a pressing threaded sleeve and a sealing rubber sleeve, wherein two ends of the horseshoe-shaped pressing block extend into two clamping grooves respectively, the pressing threaded sleeve is sleeved on an oil sprayer assembly, a pressing block hole is formed in the lower end face of the pressing threaded sleeve, the horseshoe-shaped pressing block is located in the pressing block hole, a threaded hole is formed in a cylinder cover, the pressing threaded sleeve is in threaded connection with the threaded hole, the pressing threaded sleeve is not higher than the cylinder cover, and the sealing rubber sleeve is located between the oil sprayer assembly and the pressing. The fuel injector pressing device is completely arranged in the cylinder cover, the installation of the fuel injector assembly is not limited by the structure of the fuel injector assembly or the space of the upper plane of the cylinder cover, and the risk of interference with other parts of the upper plane of the cylinder cover does not exist, so that the fuel injector assembly can be more freely applied to the development of new products or matched with the existing products in space.
Description
Technical Field
The utility model relates to the technical field of engines, specific theory relates to a sprayer assembly closing device.
Background
With the increasing requirements of customers on the power of diesel engines and the increasingly stringent emission regulations, various fuel injector assemblies capable of meeting different performance requirements are required to be applied to new product development or be matched with the existing products, but the matching schemes of a plurality of fuel injector assemblies and cylinder cover assemblies are difficult to implement due to the limitation of the installation mode of the fuel injector assemblies and the plane space on the cylinder cover.
Referring to JB/T5173 and combining practical application, the most common mounting modes of the middle-high speed diesel injector assembly are a pressing plate type mounting mode and a threaded type mounting mode (screwing in by using a connecting threaded sleeve), and the two mounting modes respectively have advantages and disadvantages.
The oil injector assembly can be accurately positioned by matching the pressure plate with the clamping groove on the oil injector body, and meanwhile, the use of the independently installed pressure plate, the fastener and the like is convenient for the installation and maintenance of the oil injector assembly; however, the pressure plate indirectly transfers the axial force of the bolt to the fuel injector by utilizing the lever principle, and the installation mode has high requirements on the structural size and the assembly process of the pressure plate and is difficult to apply due to the limitation of the self structure (large diameter or low height) of the fuel injector assembly or the space of the upper plane of the cylinder cover.
In the latter, a connecting threaded sleeve is integrated on an oil injector assembly, the threaded sleeve is screwed into the cylinder cover, and the threaded sleeve directly acts on an oil injector body through a steel ring or directly and directly transmits the axial force to the oil injector. The installation mode is not limited by the structure of the fuel injector assembly or the space of the upper plane of the cylinder cover; however, the fuel injector assembly has the problem of incapability of positioning and can rotate along with the screwing of the threaded sleeve, so that the reliability of high-temperature and high-pressure fuel gas sealing between the fuel injector assembly and the cylinder cover assembly is directly influenced. In addition, the screw sleeve and the oil injector body cannot be sealed, and lubricating oil can infiltrate into a high-temperature area of the cylinder cover assembly close to a combustion surface from a gap between the screw sleeve and the oil injector body to deteriorate, so that the oil injector assembly or the cylinder cover assembly is damaged finally.
For example, chinese utility model patent CN208702592U discloses a fuel injector fixing and pressing device, which uses a lever structure composed of a fuel injector pressing plate, a spherical washer and a fastening bolt to press a fuel injector assembly. The disadvantages of this hold-down device are:
(1) the fastening bolt is positioned below the bifurcation structure of the fuel injector, so that the fuel injector is inconvenient to install and maintain;
(2) in order to avoid the bifurcation structure of the fuel injector, a long special-shaped lever needs to be arranged, and the volume of the fuel injector pressure plate is increased. The space of the upper plane of the cylinder cover is limited, and the pressure plate of the oil injector is arranged between moving mechanisms such as a valve spring and the like, so that the risk of interference exists. In practical application, the case that the oil injector pressure plate is locally thinned to avoid exists, so that the reliability of the oil injector pressure plate is reduced.
(3) The oil injector pressure plate is of a thin-wall porous structure, in order to obtain enough rigidity, the height and the material thickness of the oil injector pressure plate are large, so that the opening height and the depth of an installation clamping groove matched with the oil injector body on the oil injector body are increased, and the reliability of an oil injector assembly is reduced. For example, because a certain existing oil injector is fixed by adopting an oil injector pressing plate structure, the minimum wall thickness between an oil duct and a clamping groove in an oil injector body is only 2.4mm, the machining difficulty is high, and the reliability is reduced.
(4) The lever ratio of the oil injector pressure plate and other structural dimensions and assembly process requirements are high, and the manufacturing cost is high.
Disclosure of Invention
To the above problem, the utility model aims to solve the technical problem that: a fuel injector assembly hold down device within a cylinder head is provided.
In order to solve the technical problem, the technical scheme of the utility model is that:
the utility model provides a sprayer assembly closing device, the relative bilateral symmetry of sprayer assembly is equipped with the draw-in groove, the sprayer assembly is fixed in the cylinder head, sprayer assembly closing device includes: the oil sprayer comprises a horseshoe-shaped pressing block, a pressing threaded sleeve and a sealing rubber sleeve, wherein two ends of the horseshoe-shaped pressing block extend into the two clamping grooves respectively, the pressing threaded sleeve is arranged in the oil sprayer assembly, a pressing block hole is formed in the lower end face of the pressing threaded sleeve, the horseshoe-shaped pressing block is located in the pressing block hole, a threaded hole is formed in the cylinder cover, the pressing threaded sleeve is connected in the threaded hole in a threaded mode, the pressing threaded sleeve is not higher than the cylinder cover, and the sealing rubber sleeve is located between the oil sprayer assembly and the pressing threaded sleeve.
Preferably, the thickness of the shoe press is less than the depth of the press block hole.
Preferably, the hoof-shaped pressing block and the cylinder cover are correspondingly provided with pin holes, the pin holes are a pressing block pin hole and a cylinder cover pin hole respectively, positioning pins are arranged in the pressing block pin hole and the cylinder cover pin hole, and the length of each positioning pin is smaller than the distance between the hole bottom of the pressing block pin hole and the hole bottom of the cylinder cover pin hole.
Preferably, the upper end part of the inner hole of the pressing screw sleeve is provided with a conical opening towards the upper part, and the conical half angle of the conical opening is defined as α, and the conical half angle of the bifurcation part of the fuel injector assembly is theta, α > theta.
Preferably, the lowest point of the conical opening is spaced further from the fuel injector assembly at the point of divergence than the depth of the pressure block bore.
Preferably, the outer peripheral surface of the sealing rubber sleeve is a conical surface with a small upper part and a large lower part, and the inner hole of the compression screw sleeve is provided with a conical surface matched with the outer peripheral surface of the sealing rubber sleeve.
Preferably, the upper end surface of the pressing threaded sleeve is provided with a toothed groove.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
(1) the utility model discloses a sprayer closing device arranges the cylinder head in completely, and the installation of sprayer assembly not only does not receive the restriction in plane space on self structure or the cylinder head, does not have the risk of interfering with other spare parts on the cylinder head upper surface moreover, and the sprayer assembly can use new product development more freely in the space or match on the current product. If be applied to current gas engine product for spouting the sprayer a little with the mechanical fuel sprayer repacking, original mechanical fuel sprayer can use the briquetting mode to install, nevertheless spouts the sprayer a little and can't use the briquetting mode to install because of sprayer height and bifurcation structure restriction, uses the technical scheme of the utility model afterwards, can realize customer's requirement.
(2) The U-shaped pressing block is small in structure, accurate in positioning, low in requirements on the opening height and the depth of a clamping groove formed in the oil sprayer assembly, and capable of improving the reliability of the oil sprayer assembly.
(3) The sealing rubber sleeve is contacted with the pressing threaded sleeve through a conical surface, and the sealing rubber sleeve is compressed in the screwing process of the pressing threaded sleeve, so that reliable sealing is realized.
(4) The utility model discloses a sprayer closing device need not to integrate in the sprayer assembly, can independent dismouting, is convenient for maintain or change.
Drawings
FIG. 1 is a schematic diagram of an explosion structure of a fuel injector assembly hold-down apparatus of the present invention;
FIG. 2 is a schematic cross-sectional view of a fuel injector assembly hold-down apparatus of the present invention;
in the figure: 1-pressing the threaded sleeve; 11-a toothed groove; 2-positioning pins; 3-a shoe-shaped briquette; 4-sealing the rubber sleeve; 5-a fuel injector assembly; 51-a card slot; 6-cylinder head; 7-injector liner; 8-O type sealing ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and fig. 2 jointly, a sprayer assembly closing device, sprayer assembly 5 pass through the utility model discloses a sprayer assembly closing device is fixed in cylinder head 6, and sprayer assembly 5 is equipped with sprayer bush 7 outward, is equipped with O type sealing washer 8 between sprayer bush 7 and the cylinder head 6, and the bilateral symmetry that sprayer assembly 5 is relative is equipped with draw-in groove 51, and cylinder head 6 is equipped with the screw hole that is used for installing sprayer assembly 5.
The utility model discloses a sprayer assembly closing device includes hoof briquetting 3, compresses tightly swivel nut 1, locating pin 2 and sealed gum cover 4.
The both ends of hoof briquetting 3 are arranged in two draw-in grooves 51 respectively, be equipped with respectively between hoof briquetting 3 and the cylinder head 6 and correspond and be equipped with the pinhole, two pinholes are briquetting pinhole and cylinder head pinhole respectively, locating pin 2 is arranged in briquetting pinhole and cylinder head pinhole, and the length that satisfies locating pin 2 is less than the distance between briquetting pinhole hole bottom and the cylinder head pinhole bottom, in order to avoid screwing when compressing tightly swivel nut 1, the axial force that the hoof briquetting 3 was applyed is used for cylinder head 6, lead to the hoof briquetting 3 can't apply the effort to sprayer assembly 5.
The sealing rubber sleeve 4 is arranged outside the fuel injector assembly 5, the sealing rubber sleeve 4 is positioned between the fuel injector assembly 5 and the pressing threaded sleeve 1, and the outer peripheral surface of the sealing rubber sleeve 4 is a conical surface with a small upper part and a large lower part.
The pressing threaded sleeve 1 is arranged outside the fuel injector assembly 5, a pressing block hole is formed in the lower end face of the pressing threaded sleeve 1, the depth of the pressing block hole is L3, the thickness of the hoof-shaped pressing block 3 is L2, L2 is smaller than L3, and the hoof-shaped pressing block 3 is completely located in the pressing block hole to guarantee good guiding of the hoof-shaped pressing block 3 in the pressing process.
The upper end part of an inner hole of the pressing screw sleeve 1 is provided with a conical opening facing to the upper part, the distance between the lowest point of the conical opening and the bifurcation of the fuel injector assembly 5 is L1, L1 is more than L3, a gap for installing the shoe-shaped pressing block 3 is reserved in the height direction, so that the shoe-shaped pressing block 3 can be conveniently assembled in the pressing block hole, the conical half angle of the conical opening is α, the conical half angle of the bifurcation of the fuel injector assembly 5 is theta, α is more than theta, so that interference between the pressing screw sleeve 1 and the fuel injector assembly 5 is avoided, the inner hole of the pressing screw sleeve 1 is also provided with a conical surface facing downwards, the conical angle of the conical surface is β, the conical surface is matched with the outer peripheral surface of the sealing rubber sleeve 4, and the conical surface with the conical angle β is positioned below the conical surface with the conical half angle of α, the upper surface of the pressing screw sleeve 1 is provided with a plurality of tooth-shaped grooves 11, and the tooth-.
When the fuel injector assembly 5 is assembled, the pressing threaded sleeve 1 is screwed, the pressing threaded sleeve 1 applies acting force to the shoe-shaped pressing block 3, the shoe-shaped pressing block 3 presses the fuel injector assembly 5, the fuel injector assembly 5 is fixed on the cylinder cover 6, meanwhile, the sealing rubber ring 4 is compressed and deformed, and the sealing rubber ring 4 seals a gap between the fuel injector assembly 5 and the pressing threaded sleeve 1 to prevent lubricating oil from flowing outwards. The positioning pin 2 prevents the fuel injector assembly 5 from rotating along with the compression threaded sleeve 1 and accurately positions the direction of each interface of the fuel injector assembly.
As shown in fig. 2, the injector assembly pressing device of the present invention is completely located in the cylinder head 6, the installation of the injector assembly 5 is not limited by its structure or the space of the upper plane of the cylinder head 6, and there is no risk of interference with other components on the upper plane of the cylinder head 6, and the injector assembly 5 can be more freely applied to the development of new products or the matching of existing products in space. Be applied to current gas engine product for spouting the sprayer a little if with the mechanical fuel sprayer repacking, original mechanical fuel sprayer can use the briquetting mode to install, nevertheless spouts the sprayer a little and can't use the briquetting mode to install because of sprayer height and bifurcation structure restriction, uses the technical scheme of the utility model afterwards, can realize customer's requirement.
The shoe-shaped pressing block 3 is small in structure, accurate in positioning, low in requirements on the opening height and the depth of the clamping groove 51 formed in the oil sprayer assembly 5, and capable of improving the reliability of the oil sprayer assembly 5.
The sealing rubber sleeve 4 is contacted with the pressing threaded sleeve 1 through a conical surface, and the sealing rubber sleeve 4 is compressed in the screwing process of the pressing threaded sleeve 1, so that reliable sealing is realized.
The utility model discloses a sprayer closing device need not to integrate in sprayer assembly 5, can independent dismouting, is convenient for maintain or change.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (7)
1. Sprayer assembly closing device, the bilateral symmetry that the sprayer assembly is relative is equipped with the draw-in groove, the sprayer assembly is fixed in the cylinder head, its characterized in that, sprayer assembly closing device includes: the oil sprayer comprises a horseshoe-shaped pressing block, a pressing threaded sleeve and a sealing rubber sleeve, wherein two ends of the horseshoe-shaped pressing block extend into the two clamping grooves respectively, the pressing threaded sleeve is arranged in the oil sprayer assembly, a pressing block hole is formed in the lower end face of the pressing threaded sleeve, the horseshoe-shaped pressing block is located in the pressing block hole, a threaded hole is formed in the cylinder cover, the pressing threaded sleeve is connected in the threaded hole in a threaded mode, the pressing threaded sleeve is not higher than the cylinder cover, and the sealing rubber sleeve is located between the oil sprayer assembly and the pressing threaded sleeve.
2. The fuel injector assembly hold down of claim 1, wherein a thickness of said shoe is less than a depth of said block bore.
3. The fuel injector assembly hold down of claim 1, wherein said shoe block and said cylinder head have corresponding pin bores, said pin bores being a block pin bore and a cylinder head pin bore, respectively, and wherein said block pin bore and said cylinder head pin bore have locating pins therein, said locating pins having a length less than a distance between a bottom of said block pin bore and a bottom of said cylinder head pin bore.
4. The fuel injector assembly hold down of claim 1 wherein the upper end of the internal bore of said hold down nut is provided with an upwardly directed conical opening defining a conical half angle of α at said conical opening and theta at the bifurcation of said fuel injector assembly, α > theta.
5. The fuel injector assembly hold down of claim 4, wherein a lowest point of said conical opening is spaced from a point at which said fuel injector assembly diverges by a distance greater than a depth of said pressure block bore.
6. The fuel injector assembly hold down of claim 1, wherein the outer circumference of said packing rubber sleeve is a tapered surface with a smaller top and a larger bottom, and said hold down barrel inner bore is provided with a tapered surface that mates with said packing rubber sleeve outer circumference.
7. The fuel injector assembly hold down of claim 1, wherein an upper end surface of said hold down nut is provided with a toothed groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622228.9U CN210660401U (en) | 2019-09-26 | 2019-09-26 | Fuel injector assembly pressing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622228.9U CN210660401U (en) | 2019-09-26 | 2019-09-26 | Fuel injector assembly pressing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210660401U true CN210660401U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921622228.9U Active CN210660401U (en) | 2019-09-26 | 2019-09-26 | Fuel injector assembly pressing device |
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| CN (1) | CN210660401U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944561A (en) * | 2021-11-26 | 2022-01-18 | 中国北方发动机研究所(天津) | Structure for improving fatigue strength of engine cylinder cover |
-
2019
- 2019-09-26 CN CN201921622228.9U patent/CN210660401U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944561A (en) * | 2021-11-26 | 2022-01-18 | 中国北方发动机研究所(天津) | Structure for improving fatigue strength of engine cylinder cover |
| CN113944561B (en) * | 2021-11-26 | 2023-11-21 | 中国北方发动机研究所(天津) | Structure for improving fatigue strength of engine cylinder cover |
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