Injection pump guide piston assembly
阅读说明:本技术 一种喷油泵导向活塞组件 (Injection pump guide piston assembly ) 是由 侯旭洪 涂天华 栗东民 林小雪 陈康 李栋 秦仕雄 于 2019-11-08 设计创作,主要内容包括:本发明的目的在于提供了一种喷油泵导向活塞组件,以实现提高导向活塞组件的抗咬合能力的效果。本发明的技术方案为:本发明提供了一种喷油泵导向活塞组件,包括:导向活塞,其上端面的中心位置处开设有第一安装孔;其下端面开设有第二安装孔,所述第一安装孔和所述第二安装孔通过连接孔连通;滚轮组件,包括:安装在所述第二安装孔内的滚轮,过盈装配于所述滚轮内的滚轮衬套,以及过盈装配于所述滚轮的轴向两端的止推轴承;滚轮销,其间隙装配于所述滚轮衬套内;所述第二安装孔的孔壁突出设置有凸台,所述凸台与所述止推轴承接触。(The invention aims to provide a guide piston assembly of an oil injection pump, so as to achieve the effect of improving the anti-engagement capacity of the guide piston assembly. The technical scheme of the invention is as follows: the invention provides a fuel injection pump guide piston assembly, comprising: the center position of the upper end surface of the guide piston is provided with a first mounting hole; a second mounting hole is formed in the lower end face of the connecting rod, and the first mounting hole is communicated with the second mounting hole through a connecting hole; a roller assembly comprising: the roller is arranged in the second mounting hole, the roller bushing is in interference fit in the roller, and the thrust bearings are in interference fit at the two axial ends of the roller; a roller pin which is clearance fitted in the roller bushing; the hole wall of the second mounting hole is provided with a boss in a protruding mode, and the boss is in contact with the thrust bearing.)
1. An injection pump guide piston assembly, comprising:
the center of the upper end surface of the guide piston (1) is provided with a first mounting hole; a second mounting hole (16) is formed in the lower end face of the connecting rod, and the first mounting hole is communicated with the second mounting hole (16) through a connecting hole (13);
a roller assembly comprising: the roller (2) is installed in the second installation hole (16), the roller bushing (8) is in interference fit in the roller (2), and the thrust bearings (6) are in interference fit at two axial ends of the roller (2);
a roller pin (3) which is fitted with clearance in the roller bushing (8);
the hole wall of the second mounting hole (16) is provided with a boss (12) in a protruding mode, and the boss (12) is in contact with the thrust bearing (6).
2. The injection pump guide piston assembly of claim 1,
the thrust bearing (6) is made of copper alloy;
evenly arranged on the terminal surface of footstep bearing (6) a plurality of radial oil groove (30), radial oil groove (30) orientation the pore wall setting of second mounting hole (16).
3. The injection pump guide piston assembly of claim 1,
spherical annular grooves (29) are formed in the axial direction of the roller (2), and arc transitional connection is formed between the groove bottoms of the spherical annular grooves (29) and the axial end faces of the roller (2).
4. The injection pump guide piston assembly of claim 1,
the outer circle surface of the roller pin (3) is provided with a DLC coating;
the roller bushing (8) is made of copper alloy.
5. The injection pump guide piston assembly of claim 1,
the outer surface of the roller pin (3) is a cylindrical surface, two-step kidney-shaped grooves are formed in two positions on the cylindrical surface respectively, and the kidney-shaped grooves are formed in the middle of the roller pin (3);
a small-angle wedge-shaped groove is formed between the kidney-shaped groove (25) positioned on the outer layer and the outer surface of the roller bushing (8), and an oil hole (27) is formed in the kidney-shaped groove (24) positioned on the inner layer;
the two oil holes (27, 28) at the two positions are communicated through a lubricating oil outlet passage which is arranged at 90 degrees.
6. The injection pump guide piston assembly of claim 5,
the outer surface of the guide piston (1) is a cylindrical surface, two circumferential oil grooves (20, 21), a first axial oil groove (23) and a vertical groove (22) are arranged on the cylindrical surface, the vertical groove (22) is arranged in the circumferential oil groove (21), and the vertical groove (22) is communicated with the circumferential oil groove (20) through the first axial oil groove (23);
the cylindrical surface is also provided with an inclined hole (10), and two ends of the inclined hole (10) are respectively communicated with the circumferential oil groove (21) and the inner wall of the second mounting hole (16);
a second axial oil groove (17) communicated with the circumferential oil groove (21) is further formed in the cylindrical surface;
the cylindrical surface is also provided with a first straight hole (18) and a second straight hole (19) which are connected, the first straight hole (18) is communicated with the first axial oil groove (23), and the second straight hole (19) is communicated with the first mounting hole;
and a lubricating oil inlet channel (9) is arranged on the outer circular surface of the roller pin (3), the lubricating oil inlet channel (9) is arranged opposite to the inclined hole (10), and the lubricating oil inlet channel (9) is communicated with the lubricating oil outlet channel.
7. The injection pump guide piston assembly of claim 1,
a first hole (11) is formed in the wall of the second mounting hole (16);
a second hole (26) is formed in the outer circle surface of the roller pin (3);
a spring (4) and a stop pin (5) are sequentially placed in the second hole (26), and part of the stop pin (5) extends into the first hole (11).
8. The injection pump guide piston assembly of claim 1,
forced lubrication is adopted between the roller pin (3) and the roller bushing (8);
and forced lubrication is adopted between the thrust bearing (6) and the boss (12).
9. The injection pump guide piston assembly of claim 1,
a first chamfer (14) is arranged at the outer circle of the upper end of the guide piston (1);
and a second chamfer (15) is arranged on the hole wall of the first mounting hole.
Technical Field
The invention relates to the field of fuel supply pumps of marine low-speed machines, in particular to a guide piston assembly of a fuel injection pump.
Background
Increasingly stringent emissions regulations and increasing density power of diesel engines place greater demands on diesel fuel systems. Increasing the injection pressure of the fuel is an important approach to solving these problems. The guide piston assembly is used as a key assembly of a transmission part of the high-pressure fuel injection pump, the structure is complex, the loading condition is variable, and relative friction exists between the guide piston assembly and a fuel injection pump body. As the injection pressure continues to increase, the pilot piston assembly is subjected to greater and greater loads and seizure is more likely to occur.
Disclosure of Invention
The invention aims to provide a guide piston assembly of an oil injection pump, so as to achieve the effect of improving the anti-engagement capacity of the guide piston assembly.
The technical scheme of the invention is as follows:
the invention provides a fuel injection pump guide piston assembly, comprising:
the center position of the upper end surface of the guide piston is provided with a first mounting hole; a second mounting hole is formed in the lower end face of the connecting rod, and the first mounting hole is communicated with the second mounting hole through a connecting hole;
a roller assembly comprising: the roller is arranged in the second mounting hole, the roller bushing is in interference fit in the roller, and the thrust bearings are in interference fit at the two axial ends of the roller;
a roller pin which is clearance fitted in the roller bushing;
the hole wall of the second mounting hole is provided with a boss in a protruding mode, and the boss is in contact with the thrust bearing.
Preferably, the thrust bearing is made of copper alloy;
a plurality of radial oil grooves are uniformly arranged on the end face of the thrust bearing and face the hole wall of the second mounting hole.
Preferably, a spherical ring groove is formed in the axial direction of the roller, and arc transitional connection is formed between the groove bottom of the spherical ring groove and the axial end face of the roller.
Preferably, the outer circle surface of the roller pin is provided with a DLC coating;
the roller bushing is made of copper alloy.
Preferably, the outer surface of the roller pin is a cylindrical surface, two positions on the cylindrical surface are respectively provided with two-step kidney-shaped grooves, and the kidney-shaped grooves are arranged in the middle of the roller pin;
a small-angle wedge-shaped groove is formed between the kidney-shaped groove positioned on the outer layer and the outer surface of the roller bushing, and an oil hole is formed in the kidney-shaped groove positioned on the inner layer;
the two oil holes at the two positions are communicated through a lubricating oil outlet channel, and the lubricating oil outlet channel is arranged at 90 degrees.
Preferably, the outer surface of the guide piston is a cylindrical surface, two circumferential oil grooves, a first axial oil groove and a vertical groove are arranged on the cylindrical surface, the vertical groove is formed in the circumferential oil grooves, and the vertical groove is communicated with the circumferential oil grooves through the first axial oil groove;
the cylindrical surface is also provided with an inclined hole, and two ends of the inclined hole are respectively communicated with the circumferential oil groove and the inner wall of the second mounting hole;
the cylindrical surface is also provided with a second axial oil groove communicated with the circumferential oil groove;
the cylindrical surface is also provided with a first straight hole and a second straight hole which are connected, the first straight hole is communicated with the first axial oil groove, and the second straight hole is communicated with the first mounting hole;
and a lubricating oil inlet channel is arranged on the outer circular surface of the roller pin and is arranged opposite to the inclined hole, and the lubricating oil inlet channel is communicated with the lubricating oil outlet channel.
Preferably, a first hole is arranged on the hole wall of the second mounting hole;
a second hole is formed in the outer circle surface of the roller pin;
a spring and a stop pin are sequentially placed in the second hole, and the stop pin partially extends into the first hole.
Preferably, forced lubrication is adopted between the roller pin and the roller bushing;
and forced lubrication is adopted between the thrust bearing and the lug boss.
Preferably, a first chamfer is arranged at the excircle of the upper end of the guide piston;
and a second chamfer is arranged on the hole wall of the first mounting hole.
The invention has the beneficial effects that:
the anti-occlusion capacity between the guide piston and the roller assembly, between the roller assembly and the roller pin, and between the guide piston and the fuel injection pump body is improved, and the guide piston is compact in overall structure and high in bearing capacity.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is one of the cross-sectional views of the pilot piston of the present invention;
FIG. 3 is a second cross-sectional view of the pilot piston of the present invention;
FIG. 4 is a schematic structural view of a pilot piston according to the present invention;
FIG. 5 is a schematic view of the roller pin of the present invention;
FIG. 6 is a schematic structural view of the roller assembly of the present invention;
FIG. 7 is a schematic view of the thrust bearing of the present invention;
description of reference numerals: 1-a pilot piston; 2, rolling wheels; 3-roller pin; 4-a spring; 5, a stop pin; 6-a thrust bearing; 7-a flat end holding screw of the inner hexagon; 8-roller bushing; 9-lubricating oil inlet channel; 10-inclined hole; 11 — a first hole; 12-a boss; 13-connecting hole: 14-first chamfer; 15-second chamfering: 16-second mounting hole: 17 — second axial oil sump; 18-a first straight hole; 19-a second straight hole; 20, 21-circumferential oil grooves; 22-vertical groove; 23 — a first axial oil groove; 24, 25-kidney slot; 26 — a second hole; 27, 28-oil holes; 29-spherical ring groove; 30-radial oil groove.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1-7, the present invention provides an injection pump guide piston assembly comprising:
the outer surface of the guide piston 1 is designed into a cylindrical surface, a first mounting hole is formed in the center of the upper end surface of the guide piston 1 and used for being matched with a plunger and a plunger spring for use and mounting a
As shown in fig. 1, 6 and 7, the pilot piston assembly further comprises: a roller assembly comprising: a
When the
As shown in fig. 7, the thrust bearing 6 is made of copper alloy, specifically, bronze alloy, which can effectively reduce the friction coefficient between the thrust bearing 6 and the boss 12; at the same time, the impact resistance and self-lubricity of bronze alloys are also utilized. Evenly arranged a plurality of
As shown in fig. 1 and 6, a
Specifically, a DLC coating is arranged on the outer circle surface of the
As shown in fig. 4, two-step kidney-shaped slots are respectively arranged at two positions on the cylindrical surface of the
As shown in fig. 1 to 5, the outer surface of the pilot piston 1 is a cylindrical surface, two circumferential oil grooves 20 and 21, a first axial oil groove 23 and a vertical groove 22 are arranged on the cylindrical surface, the vertical groove 22 is opened in the circumferential oil groove 21, and the vertical groove 22 is communicated with the circumferential oil grooves 20 and 21 through the first axial oil groove 23; the cylindrical surface is also provided with an inclined hole 10, and two ends of the inclined hole 10 are respectively communicated with the circumferential oil groove 21 and the inner wall of the second mounting hole 16; the cylindrical surface is also provided with a second axial oil groove 17 communicated with the circumferential oil groove 21; the cylindrical surface is also provided with a first straight hole 18 and a second straight hole 19 which are connected, the first straight hole 18 is communicated with the first axial oil groove 23, the second straight hole 19 is communicated with the first mounting hole, and the lubrication of a lower spring assembly mounted in the first mounting hole can be realized; and a lubricating oil inlet channel 9 is arranged on the outer circular surface of the roller pin 3, the lubricating oil inlet channel 9 is arranged opposite to the inclined hole 10, and the lubricating oil inlet channel 9 is communicated with the lubricating oil outlet channel. That is, the lubricating oil flowing out from the fuel injection pump body flows into the
In addition, as can be seen from fig. 1, an inner hexagonal
In addition, in the embodiment, forced lubrication is adopted between the
As shown in fig. 1, a
According to the embodiment of the invention, the anti-occlusion capacity between the guide piston 1 and the roller assembly, between the roller assembly and the
While the foregoing embodiments of the invention have been described in relation to only some of the one or more embodiments thereof, it will be understood by those skilled in the art that the invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
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