CN110700980A - Injection pump guide piston assembly - Google Patents
Injection pump guide piston assembly Download PDFInfo
- Publication number
- CN110700980A CN110700980A CN201911088291.3A CN201911088291A CN110700980A CN 110700980 A CN110700980 A CN 110700980A CN 201911088291 A CN201911088291 A CN 201911088291A CN 110700980 A CN110700980 A CN 110700980A
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- Prior art keywords
- roller
- hole
- guide piston
- mounting hole
- groove
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
Abstract
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.
Description
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 lower spring 4 assembly, and a connecting hole 13 between the first mounting hole and a second mounting hole is formed in the center of the upper end surface of the guide piston 1, so that lubricating oil (A5) can be distributed on the surface of the roller more uniformly; the lower end face of the guide piston is provided with a second mounting hole 16, the second mounting hole 16 is used for fixing and supporting the roller assembly and the roller pin 3, meanwhile, the roller assembly and the roller pin 3 are lubricated through the guide piston 1, and the first mounting hole is communicated with the second mounting hole 16 through a connecting hole 13.
As shown in fig. 1, 6 and 7, the pilot piston assembly further comprises: a roller assembly comprising: a roller 2 mounted in the second mounting hole 16, a roller bushing 8 interference-fitted in the roller 2, and thrust bearings 6 interference-fitted at both axial ends of the roller 2; the roller pin 3 is assembled in the roller bushing 8 with a gap, and the outer circular surface of the roller pin 3 is a cylindrical surface; wherein, the hole wall of the second mounting hole 16 is provided with a boss 12 in a protruding way, and the boss 12 is contacted with the thrust bearing 6. For the roller 2, the roller 2 adopts an end grooving deformation design to reduce boundary stress; specifically, for the roller 2, when the roller 2 is machined, the outer circle of the roller 2 and the inner hole of the roller 2 are firstly ground, then grooving machining is carried out on spherical ring grooves 29 on two axial end faces, after grooving machining is completed, the outer circle and the inner hole generatrix of the roller 2 are naturally deformed into arcs, the edge effect existing on the outer cylindrical surface of the roller 2 and the side pressure effect of the inner hole of the roller 2 can be effectively weakened in the rotating process of the roller 2, stress distribution of the inner working surface and the outer working surface of the roller assembly is balanced, and excessive abrasion caused by overlarge local stress between the roller assembly and the roller pin 3 is reduced. The roller bushing 8 and the roller 2 are in interference fit, so that the relative speed between the moving surface of the roller bushing 8 and the roller pin 3 is increased, the end surface of the roller bushing 8 moves at a high speed to form an effective dynamic pressure oil film with the roller pin 3, the dynamic pressure lubrication effect is improved, and the probability of seizure between the roller bushing 8 and the roller pin 3 is reduced; the roller 2 and the thrust bearing 6 are in interference fit, so that the relative speed between the moving surface of the thrust bearing 6 and the boss 12 is increased, the end surface of the thrust bearing 6 moves at a high speed to form an effective dynamic pressure oil film between the thrust bearing and the boss 12, the dynamic pressure oil film is formed, the dynamic pressure lubrication effect is improved, and the possibility of seizing between the thrust bearing 6 and the boss 12 is reduced. The thrust bearing 6 is provided with a radial oil groove 30, so that excessive abrasion caused by insufficient oil supply on the end surface of the thrust bearing 6 when the boss 12 and the thrust bearing 6 are tightly attached can be prevented.
When the roller pin 3 is assembled on the guide piston 1, a spring 4 and a stop pin 5 for limiting the roller pin 3 are arranged, wherein a first hole 11 is arranged on the wall of the second mounting hole 16; a second hole 26 is formed on the outer circumferential surface of the roller pin 3; a spring 4 and a stop pin 5 are sequentially placed in the second hole 26, and the stop pin 5 partially extends into the first hole 11. Specifically, when the roller assembly and the roller pin 3 are assembled on the guide piston 1, the roller bushing 8 and the thrust bearing 6 are firstly installed on the roller 2 in a cold-assembling mode; then the spring 4 and the stop pin 5 are sequentially placed into the second hole 26 of the roller pin 3; then, the roller assembly is placed at the lower part of the guide piston 1, and a roller pin 3 sequentially penetrates through one side of a first hole 11 at the lower end of the guide piston 1, an inner hole of the roller assembly (specifically, an inner hole of a roller bush 8) and the other side of the first hole 11 at the lower end of the guide piston 1; then, the stop pin 5 is pressed by hand to a height lower than the second mounting hole 16 while the roller pin 3 is pushed until the stop pin 5 springs into the first hole 11 of the guide piston 1 by the spring 4.
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 radial oil grooves 30 on thrust bearing 6's the terminal surface, radial oil groove 30 orientation the pore wall setting of second mounting hole 16, specifically, radial oil groove 30 is 4, and the lubricating oil of storage in radial oil groove 30 can make the lubrication to thrust bearing 6 more even, the effectual lubricated effect that improves between thrust bearing 6 and the boss 12.
As shown in fig. 1 and 6, a spherical ring groove 29 is formed in the axial direction of the roller 2, and a circular arc transitional connection is formed between the groove bottom of the spherical ring groove 29 and the axial end surface of the roller 2, and as can be seen from fig. 6, the groove wall of the spherical ring groove 29 is formed into an arc shape, which can effectively weaken the edge effect existing on the outer cylindrical surface of the roller 2 and the side pressure effect of the inner hole of the roller 2 in the rotation process of the roller 2, so that the stress distribution of the inner and outer working surfaces of the roller assembly is balanced, and the probability of seizing between the roller assembly and the roller pin 3 is reduced.
Specifically, a DLC coating is arranged on the outer circle surface of the roller pin 3; the roller bushing 8 is made of copper alloy, and particularly is made of bronze alloy. DLC coating hardness is high, the coefficient of friction is little, wear-resisting, high temperature resistant, and when the lubrication between gyro wheel bush 8 and gyro wheel pin 3 is bad, the friction that DLC picture layer and copper alloy bearing gyro wheel bush 8 constitute is still can carry out good operation, can further reduce the probability that takes place to block between gyro wheel pin 3 and the gyro wheel bush 8.
As shown in fig. 4, two-step kidney-shaped slots are respectively arranged at two positions on the cylindrical surface of the roller pin 3, and the kidney-shaped slots are arranged at the middle position 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 and 28 at the two positions are communicated through a lubricating oil outlet passage which is arranged at 90 degrees. The oil groove 25 is formed in a slender waist shape, and is mainly used for enabling the relative movement of the roller bushing 8 and the roller pin 3 to be longer in contact with lubricating oil, so that the movement speed of two moving surfaces can be fully utilized, and the lubricating oil is brought into a friction surface. Meanwhile, a small-angle wedge-shaped oil groove is formed between the kidney-shaped groove 25 positioned at the outer layer and the roller bushing 8 to enhance dynamic pressure lubrication. The inner layer of the kidney groove 24 is used for storing lubricating oil to ensure sufficient supply of lubricating oil for the friction surface. In short, the arrangement of the two-step kidney-shaped groove can improve the friction condition between the roller bushing 8 and the roller pin 3 and reduce the probability of seizure between the two.
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 circumferential oil groove 21 through the second axial oil groove 17, and then flows into the circumferential oil groove 20 through the vertical groove 22 and the first axial oil groove 23, so that lubrication between the pilot piston 1 and the fuel injection pump body is realized, and because the clearance between the pilot piston 1 and the fuel injection pump body hole matched with the pilot piston 1 is very small, the lubricating oil entering the second axial oil groove 17 of the pilot piston 1 and the circumferential oil groove 21 keeps a certain pressure, and a lubricating oil film can be formed between the outer circle of the pilot piston 1 and the pump body hole; meanwhile, the lubricating oil in the axial oil groove 21 partially flows into the lubricating oil inlet gallery 9 through the inclined hole 10 to penetrate deeply into the roller pin 3, and then flows out to the outer circumferential surface of the roller pin 3 through the oil holes 27 and 28 to deeply lubricate between the roller pin 3 and the rolling bush 8, and a lubricating oil film is formed between the roller pin 3 and the rolling bush 8.
In addition, as can be seen from fig. 1, an inner hexagonal flat set screw 7 is installed at the end of the roll pin 3, which prevents the leakage of the lubricating oil.
In addition, in the embodiment, forced lubrication is adopted between the roller pin 3 and the roller bushing 8; the thrust bearing 6 and the boss 12 are forcibly lubricated by lubricating oil flowing out of the roller pin 3 and the bush 8.
As shown in fig. 1, a first chamfer 14 is arranged at the outer circle of the upper end of the guide piston 1, a second chamfer 15 is arranged on the hole wall of the first mounting hole, and chamfers are arranged at the edges of oil grooves formed in the outer surface of the guide piston 1, the angle range of the chamfers is 1 ~ 10 degrees, when the guide piston 1 is matched with a guide hole in an oil injection pump body, a small-angle convergent wedge can be formed, the extrusion effect in dynamic pressure lubrication is enhanced, the thickness of an oil film on the surface of the guide piston 1 during operation is increased, and the probability of seizure between the guide piston 1 and the oil injection pump body is reduced.
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 roller pin 3, and between the guide piston 1 and the fuel injection pump body is improved, and the guide piston 1 has a compact integral structure and strong bearing capacity.
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.
Claims (9)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911088291.3A CN110700980A (en) | 2019-11-08 | 2019-11-08 | Injection pump guide piston assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911088291.3A CN110700980A (en) | 2019-11-08 | 2019-11-08 | Injection pump guide piston assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110700980A true CN110700980A (en) | 2020-01-17 |
Family
ID=69204721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911088291.3A Pending CN110700980A (en) | 2019-11-08 | 2019-11-08 | Injection pump guide piston assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110700980A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253616A (en) * | 2020-10-20 | 2021-01-22 | 重庆红江机械有限责任公司 | Bushing, roller pin assembly and guide piston assembly |
-
2019
- 2019-11-08 CN CN201911088291.3A patent/CN110700980A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253616A (en) * | 2020-10-20 | 2021-01-22 | 重庆红江机械有限责任公司 | Bushing, roller pin assembly and guide piston assembly |
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