Head clearance type plunger and barrel assembly structure

Abstract

The utility model provides a top clearance type plunger and barrel assembly structure, and relates to the technical field of plunger and barrel assemblies, the top clearance type plunger and barrel assembly structure comprises a plunger sleeve, a plunger assembly is slidably connected in the plunger sleeve, the plunger assembly comprises a sleeve, and the bottom of the sleeve penetrates through the top end to be in threaded connection with an adjusting rod. A fixed seat is rotationally connected to the top end of the adjusting rod and located in the plunger sleeve, a plunger head is installed at the top end of the fixed seat, the adjusting rod is rotated to drive the plunger head to conduct fine adjustment on the vertical position in the plunger sleeve through the fixed seat, and the interior of the plunger head extends into the fixed seat to be provided with a fixing assembly. The plunger head can be detached and replaced by rotating the first threaded rod and the second threaded rod, compared with a traditional whole columnar plunger, the whole plunger does not need to be replaced when being abraded, practicability is greatly improved, and use and maintenance cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pairs, in particular to a top clearance type plunger pair structure. Background Art

[0002] The top clearance type plunger pair is a precision pair in a fuel injection pump, which is composed of a plunger and a plunger sleeve. The fuel injection is controlled by the reciprocating movement of the plunger inside the plunger sleeve. Compared with the traditional plunger pair, the design of the top clearance type plunger pair has a fuel injection advance function of 1.8°, which is particularly obvious under the condition of in-line high injection pressure. In addition, it can also reduce the fuel quantity at medium and low speeds of the fuel injection pump, so as to adjust the fuel supply speed characteristic.

[0003] The plunger in the common top clearance type plunger pair structure is usually a whole columnar structure. After long-term use, wear will occur between the top of the plunger and the plunger sleeve, which will lead to a reduction in fuel injection efficiency. Once this situation occurs, usually the whole plunger needs to be replaced, resulting in an increase in the use and maintenance cost. Therefore, we propose a top clearance type plunger pair structure. Content of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art. The plunger in the common top clearance type plunger pair structure is usually a whole columnar structure. After long-term use, wear will occur between the top of the plunger and the plunger sleeve, which will lead to a reduction in fuel injection efficiency. Once this situation occurs, usually the whole plunger needs to be replaced, resulting in an increase in the use and maintenance cost.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A top clearance type plunger pair structure, including a plunger sleeve, and a plunger assembly is slidably connected inside the plunger sleeve;

[0007] The plunger assembly includes a sleeve, an adjusting rod is threadedly connected through the bottom of the sleeve to the top, a fixed seat is rotatably connected to the top of the adjusting rod and inside the plunger sleeve, a plunger head is installed at the top of the fixed seat. Rotating the adjusting rod can drive the plunger head to finely adjust the up and down position inside the plunger sleeve through the fixed seat, and a fixing component is arranged inside the plunger head and extends into the inside of the fixed seat.

[0008] As a preferred scheme of the utility model, an oil inlet is opened at the left side near the top of the plunger sleeve, and an oil return port is opened at the right side of the plunger sleeve corresponding to the oil inlet.

[0009] The technical effect of adopting the above further scheme is that during the working process of the top clearance type plunger pair, fuel can be introduced through the oil inlet, and the excess fuel can be discharged through the oil return port to achieve the fuel pumping task.

[0010] As a preferred solution of the present utility model, a return spring is sleeved on the periphery of the plunger sleeve and below the oil inlet and the oil return port, and the return spring is fixedly connected to the plunger sleeve.

[0011] The technical effect of adopting the above further solution is that during the working process of the top clearance type plunger pair, the plunger assembly can be quickly reset by the return spring, improving the working efficiency.

[0012] As a preferred solution of the present utility model, fixing hole positions for convenient installation are symmetrically arranged near the left and right sides at the top end of the plunger sleeve.

[0013] The technical effect of adopting the above further solution is that the installation of the plunger sleeve is facilitated through the fixing hole positions.

[0014] As a preferred solution of the present utility model, limiting rods are symmetrically welded to the bottom of the fixing seat and on the left and right sides of the adjusting rod, and the limiting rods are slidably connected to the sleeve.

[0015] The technical effect of adopting the above further solution is that the moving fixing seat can be limited by the limiting rods to prevent it from rotating spirally together with the adjusting rod, improving the use stability.

[0016] As a preferred solution of the present utility model, a sealing ring is sleeved on the periphery of the plunger head near the bottom.

[0017] The technical effect of adopting the above further solution is that the sealing effect can be improved through the sealing ring, preventing fuel from flowing out through the gap between the plunger sleeve and the plunger assembly, and improving the use stability.

[0018] As a preferred solution of the present utility model, the plunger head is made of wear-resistant alloy and its surface is treated by a titanium plating process.

[0019] The technical effect of adopting the above further solution is that the wear resistance of the plunger head can be improved through the wear-resistant alloy material and the titanium plating process, thereby prolonging the service life.

[0020] As a preferred solution of the present utility model, the fixing assembly includes a first threaded rod, a fixing piece is rotatably connected to the bottom of the first threaded rod, and a second threaded rod is arranged inside the fixing piece with the periphery of the fixing seat extending into it.

[0021] The technical effect of adopting the above further solution is that by rotating the first threaded rod, it can be spirally penetrated through the plunger head and immersed into the fixing seat to preliminarily fix between the plunger head and the fixing seat. By rotating the second threaded rod and making it immersed into the fixing piece, the plunger head and the fixing seat can be secondarily reinforced, preventing the plunger head from loosening during use and improving the use stability.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] In the present utility model, through the design of the plunger sleeve and the plunger assembly, the plunger head can be disassembled and replaced by rotating the first threaded rod and the second threaded rod. Compared with the traditional integral columnar plunger, when wear occurs, it is not necessary to replace the whole, which greatly improves the practicability and effectively reduces the use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structural schematic diagram of a top clearance type plunger couple structure provided by the present utility model;

[0025] Figure 2 is the overall front structural dissection diagram of a top clearance type plunger couple structure provided by the present utility model;

[0026] Figure 3 is the overall top structural dissection diagram of a top clearance type plunger couple structure provided by the present utility model;

[0027] Figure 4 is the enlarged schematic diagram of structure A of a top clearance type plunger couple structure provided by the present utility model.

[0028] Legend: 1. Plunger sleeve; 101. Oil inlet; 102. Oil return port; 103. Return spring; 2. Plunger assembly; 201. Sleeve; 202. Adjusting rod; 203. Fixed seat; 2031. Limiting rod; 2032. Second threaded rod; 204. Plunger head; 2041. Sealing ring; 205. Fixing component; 2051. First threaded rod; 2052. Fixing piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0030] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant. Several embodiments of the present utility model are given. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are only for the purpose of illustration.

[0032] Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the description of this utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this article includes any and all combinations of one or more of the related listed items.

[0033] Embodiment 1

[0034] As Figures 1-4 shown, the present utility model provides a technical solution: a top clearance type plunger coupling structure, including a plunger sleeve 1, a plunger assembly 2 is slidably connected inside the plunger sleeve 1. The plunger assembly 2 includes a sleeve 201. The bottom of the sleeve 201 penetrates through the top and is threadedly connected with an adjusting rod 202. The top of the adjusting rod 202 and inside the plunger sleeve 1 is rotatably connected with a fixed seat 203. The top of the fixed seat 203 is provided with a plunger head 204. Rotating the adjusting rod 202 can drive the plunger head 204 to finely adjust the up and down position inside the plunger sleeve 1 through the fixed seat 203. A fixing component 205 is arranged inside the plunger head 204 and extends into the inside of the fixed seat 203.

[0035] Embodiment 2

[0036] As Figures 1-4As shown, an oil inlet 101 is provided near the top on the left side of the plunger sleeve 1, and an oil return port 102 is provided on the right side of the plunger sleeve 1 corresponding to the oil inlet 101. During the operation of the top gap plunger couple, fuel can be introduced through the oil inlet 101, and excess fuel can be discharged through the oil return port 102 to achieve the oil pumping task. A return spring 103 is provided on the periphery of the plunger sleeve 1 and below the oil inlet 101 and the oil return port 102. The return spring 103 is fixedly connected to the plunger sleeve 1. During the operation of the top gap plunger couple, the plunger assembly can be adjusted by the return spring 103. Part 2 quickly resets to improve work efficiency. The top of the plunger sleeve 1 is symmetrically provided with fixing holes for easy installation near the left and right sides. The fixing holes are convenient for installing the plunger sleeve 1. The bottom of the fixed seat 203 is symmetrically welded with limiting rods 2031 on the left and right sides of the adjusting rod 202. The limiting rods 2031 are slidably connected to the sleeve 201. The moving fixed seat 203 can be limited by the limiting rods 2031 to prevent it from spirally rotating with the adjusting rod 202, thereby improving the stability of use. The periphery of the plunger head 204 is provided with a sealing sleeve near the bottom. The sealing ring 2041 can improve the sealing effect, prevent the fuel from flowing out from the gap between the plunger sleeve 1 and the plunger assembly 2, and improve the stability of use. The plunger head 204 is made of wear-resistant alloy, and the surface is treated with titanium plating. The wear-resistant alloy material and titanium plating process can improve the wear resistance of the plunger head 204, thereby extending the service life. The fixing assembly 205 includes a first threaded rod 2051, and the bottom of the first threaded rod 2051 is rotatably connected to a fixing piece 2052. The first threaded rod 2051 is respectively connected to the fixing seat 203 and the plunger head 20 4 threaded connection, the outer periphery of the fixing seat 203 extends to the inner thread of the fixing piece 2052 and is connected with a second threaded rod 2032. By rotating the first threaded rod 2051, it can be spirally penetrated by the plunger head 204 and immersed in the interior of the fixing seat 203, thereby performing a preliminary fixation between the plunger head 204 and the fixing seat 203. By rotating the second threaded rod 2032, it is immersed in the interior of the fixing piece 2052, thereby performing a secondary reinforcement between the plunger head 204 and the fixing seat 203, preventing the plunger head 204 from loosening during use and improving the stability of use.

[0037] The working process of the present invention is as follows: when maintaining and replacing a top-gap type plunger pair structure, first use an external tool to rotate the second threaded rod 2032 to disengage it from the fixing part 2052, and at the same time rotate the second threaded rod 2032 to drive the fixing part 2052 to disengage from the fixing seat 203, thereby completing the disassembly of the plunger head 204. Then, take out the new plunger head 204 and rotate the first threaded rod 2051 and the second threaded rod 2032 in the opposite direction to complete the replacement of the plunger head 204. Compared with the traditional whole columnar plunger, there is no need to replace the entire rod when wear occurs, which greatly improves practicality and effectively reduces the cost of use and maintenance.

[0038] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A top clearance type plunger and barrel assembly structure, comprising a barrel (1), characterized in that: A plunger assembly (2) is slidably connected inside the plunger sleeve (1); The plunger assembly (2) includes a sleeve (201). An adjusting rod (202) is threadedly connected through the bottom of the sleeve (201) to the top. The top end of the adjusting rod (202) is rotatably connected to a fixing seat (203) inside the plunger sleeve (1). A plunger head (204) is installed at the top end of the fixing seat (203). Rotating the adjusting rod (202) can drive the plunger head (204) to finely adjust the vertical position inside the plunger sleeve (1) through the fixing seat (203). A fixing component (205) is arranged inside the plunger head (204) and extends into the fixing seat (203).

2. The structure of a top clearance type plunger coupling according to claim 1, characterized in that: An oil inlet (101) is provided near the top on the left side of the plunger sleeve (1), and an oil return port (102) corresponding to the oil inlet (101) is provided on the right side of the plunger sleeve (1).

3. A top clearance type plunger coupling structure according to claim 1, characterized in that: A return spring (103) is sleeved outside the plunger sleeve (1) and below the oil inlet (101) and the oil return port (102). The return spring (103) is fixedly connected to the plunger sleeve (1).

4. A top clearance type plunger and barrel pair structure according to claim 1, characterized in that: Fixing holes for easy installation are symmetrically provided near the left and right sides at the top of the plunger sleeve (1).

5. A top clearance type plunger and barrel assembly structure according to claim 1, characterized in that: Limit rods (2031) are symmetrically welded to the left and right sides of the adjusting rod (202) at the bottom of the fixing seat (203). The limit rods (2031) are slidably connected to the sleeve (201).

6. A top clearance type plunger and barrel structure according to claim 1, characterized in that: A sealing ring (2041) is sleeved near the bottom of the periphery of the plunger head (204).

7. A top clearance type plunger coupling structure according to claim 1, characterized in that: The plunger head (204) is made of wear-resistant alloy and its surface is treated by a titanium plating process.

8. A top clearance type plunger and barrel structure according to claim 1, characterized in that: The fixing component (205) includes a first threaded rod (2051). The bottom of the first threaded rod (2051) is rotatably connected to a fixing piece (2052). The first threaded rod (2051) is threadedly connected to both the fixing seat (203) and the plunger head (204). A second threaded rod (2032) is threadedly connected to the outside of the fixing seat (203) and extends into the fixing piece (2052).

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