Pump body positioning pin

Abstract

According to the pump body positioning pin provided by the utility model, the original all-steel positioning pin is changed into outer-layer nylon protection, so that the badness caused by collision is avoided, and the assembly yield of the pump body is improved. The utility model relates to a stepped hole positioning tool which is matched with positioning installation of a stepped hole, the stepped hole comprises an upper small-diameter hole and a bottom large-diameter hole, and the stepped hole positioning tool comprises a fixed connection bottom which is of a cylinder structure, and the bottom of the cylinder structure is provided with a concave thread positioning hole; a middle connection end; a top hollow sleeve; a nylon protective sleeve; and the nylon protective gland comprises a cover end and a rod end.

Description

Technical Field

[0001] This utility model relates to the technical field of pump body mounting components, specifically a pump body positioning pin. Background Technology

[0002] The HP0 fuel injection pump is one of the key components of the fuel injection system. The countersunk hole surface of the HP0 pump requires high precision machining. Defects such as pinholes or dents can lead to poor assembly and varying degrees of leakage. Existing countersunk hole locating pins are made of steel, while the HP0 pump's pins are made of aluminum alloy, which can cause impacts during installation (see...). Figure 1 This can cause defects such as surface depressions and protrusions; therefore, in order to prevent defects, it is urgent to redesign the locating pins of the fixture. Utility Model Content

[0003] To address the aforementioned issues, this utility model provides a pump body positioning pin. The positioning pin has been changed from being made entirely of steel to having an outer nylon protective layer, which avoids defects caused by collisions and improves the assembly yield of the pump body.

[0004] A pump body positioning pin, adapted for positioning and installation in a stepped hole, the stepped hole comprising an upper small-diameter hole and a bottom large-diameter hole, characterized in that it comprises:

[0005] The bottom is fixed, which is a cylindrical structure, and the bottom of the cylindrical structure is provided with an internally recessed threaded positioning hole;

[0006] Middle connection end;

[0007] Hollow top sleeve;

[0008] Nylon protective cover;

[0009] And nylon protective caps, including cap ends and rod ends;

[0010] The upper center of the fixed bottom is provided with an upwardly protruding middle connecting end, and the upper part of the middle connecting end is provided with an upwardly protruding top hollow sleeve. The top opening of the top hollow sleeve contains a cavity. The nylon protective sleeve is fitted around the outer circumference of the middle connecting end. The rod end is inserted into the cavity, and the cap end is fitted onto the upper surface of the top hollow sleeve. The equivalent diameter of the cap end is the diameter of the upper small diameter hole of the stepped hole to be inserted. The equivalent diameter of the nylon protective sleeve is the diameter of the bottom large diameter hole of the stepped hole to be inserted. The height of the nylon protective sleeve is equal to the height of the bottom large diameter hole.

[0011] Its further features are:

[0012] The middle connecting end is a stepped column, which includes an upper large-diameter cylindrical connecting end and a lower small-diameter cylindrical connecting end. The height of the small-diameter cylindrical connecting end does not exceed half the height of the upper large-diameter cylindrical connecting end. The inner diameter of the nylon protective sleeve is equal to the outer diameter of the upper large-diameter cylindrical connecting end. The height of the nylon protective sleeve is equal to the sum of the height of the upper large-diameter cylindrical connecting end and the height of the lower small-diameter cylindrical connecting end. After the nylon protective sleeve is fitted onto the outer circumference of the middle connecting end, some space is left at the bottom to fit into the gap formed by the small-diameter cylindrical connecting end, ensuring that the assembly of the nylon protective sleeve is quick and convenient.

[0013] The bottom inner ring of the nylon protective sleeve is provided with a guide cone surface from bottom to top, which ensures reliable and quick assembly of the nylon protective sleeve;

[0014] The top hollow sleeve is a cylindrical sleeve. At this time, the rod end is a cylindrical rod end, and the cap end is a circular cap end. The outer edge of the thickness of the circular cap end includes a guide cone surface that expands from top to bottom. The bottom circular surface of the circular cap end completely covers the upper outer circular surface of the cylindrical sleeve. The cylindrical rod end is fixedly inserted into the inner cavity of the cylindrical sleeve.

[0015] When the top hollow sleeve includes only two upper convex ribs, the upper surfaces of the two upper convex ribs are flush, and their inner cavities form an equivalent cylindrical cavity. The rod end, viewed from above, includes a pair of rounded edges and obtuse-angled edges on both sides. The rod end is inserted into the equivalent cylindrical cavity, with the obtuse-angled edges on both sides exposed. The cover end covers the area formed by the top hollow sleeve and the rod end, which reduces the raw material cost of the positioning pin.

[0016] The outer edge of the cap end has a guide cone surface that flares out from top to bottom.

[0017] With this invention, since the equivalent diameter of the cover end is the diameter of the upper small diameter hole to be inserted into the stepped hole, and the cover end is made of nylon, when the stepped hole of the HP0 pump is aligned, the upper surface of the cover end contacts the HP0 pump, ensuring that the cover end will not damage the stepped hole. After the cover end is effectively inserted into the upper small diameter hole, since the equivalent diameter of the nylon protective sleeve is the diameter of the bottom large diameter hole to be inserted into the stepped hole, and the height of the nylon protective sleeve is equal to the height of the bottom large diameter hole, the nylon protective sleeve and the inner wall of the bottom large diameter hole are fully fitted. The positioning pin is changed from the original all-steel to outer nylon protection, avoiding defects caused by collisions and improving the assembly yield of the pump body. Attached Figure Description

[0018] Figure 1 A schematic diagram illustrating a collision that occurs during the assembly of existing locating pins;

[0019] Figure 2 This is a front view of a specific embodiment of the present utility model;

[0020] Figure 3 for Figure 2 Top view;

[0021] Figure 4 for Figure 2 The front view of the corresponding nylon protective cap;

[0022] Figure 5 This is a front view of a specific embodiment two of the present utility model;

[0023] Figure 6 for Figure 5 Top view;

[0024] Figure 7 Cross-sectional views of nylon protective sleeves adapted to specific embodiments one and two of this utility model;

[0025] The names corresponding to the serial numbers in the diagram are as follows:

[0026] The components include: bottom 10, internal concave thread positioning hole 11, middle connecting end 20, upper large diameter cylindrical connecting end 21, lower small diameter cylindrical connecting end 22, top hollow sleeve 30, upper convex rib 31, nylon protective sleeve 40, guide cone surface 41, nylon protective cap 50, cap end 51, guide cone surface 511, rod end 52, and obtuse angle side 521. Detailed Implementation

[0027] A pump body positioning pin, adapted for positioning and installation in a stepped hole, the stepped hole including an upper small-diameter hole and a bottom large-diameter hole, see... Figures 2-7 It includes a fixed bottom 10, a middle connecting end 20, a top hollow sleeve 30, a nylon protective sleeve 40, and a nylon protective cover 50;

[0028] The bottom of the fixed connection 10 is a column structure, and the bottom of the column structure 10 is provided with an internally concave threaded positioning hole 11.

[0029] The upper center of the fixed bottom 10 is provided with an upwardly protruding middle connecting end 20, and the upper part of the middle connecting end 20 is provided with an upwardly protruding top hollow sleeve 30. The fixed bottom 10, the middle connecting end 20, and the top hollow sleeve 30 are integrally formed structures made of steel.

[0030] The top hollow sleeve 30 has a top opening and a cavity inside. The nylon protective sleeve 40 is fitted around the outer circumference of the middle connecting end 20. The rod end 52 is inserted into the cavity, and the cap end 51 is fitted onto the upper surface of the top hollow sleeve 30. The equivalent diameter of the cap end 51 is the diameter of the upper small diameter hole of the stepped hole to be inserted. The equivalent diameter of the nylon protective sleeve 40 is the diameter of the bottom large diameter hole of the stepped hole to be inserted. The height of the nylon protective sleeve 40 is equal to the height of the bottom large diameter hole.

[0031] In specific implementation, the middle connecting end 20 is a stepped column, which includes an upper large-diameter cylindrical connecting end 21 and a lower small-diameter cylindrical connecting end 22. The height of the lower small-diameter cylindrical connecting end 22 does not exceed half the height of the upper large-diameter cylindrical connecting end 21. The inner diameter of the nylon protective sleeve 40 is equal to the outer diameter of the upper large-diameter cylindrical connecting end 21. The height of the nylon protective sleeve 40 is equal to the sum of the height of the upper large-diameter cylindrical connecting end 21 and the height of the lower small-diameter cylindrical connecting end 22. After the nylon protective sleeve 40 is fitted onto the outer circumference of the middle connecting end 20, some space is left at the bottom to be embedded in the gap formed by the small-diameter cylindrical connecting end 22, ensuring that the assembly of the nylon protective sleeve 40 is quick and convenient.

[0032] The bottom inner ring of the nylon protective sleeve 40 is provided with a bottom-up guide cone surface 41, which ensures reliable and quick assembly of the nylon protective sleeve 40.

[0033] In a specific embodiment, the top hollow sleeve 30 is a cylindrical sleeve. At this time, the rod end 52 is a cylindrical rod end, and the cap end 51 is a circular cap end. The outer edge of the thickness of the circular cap end includes a guide cone surface 511 that expands from top to bottom. The bottom circular surface of the circular cap end completely covers the upper outer circular surface of the cylindrical sleeve, and the cylindrical rod end is fixedly inserted into the inner cavity of the cylindrical sleeve.

[0034] In a specific embodiment 2, when the top hollow sleeve 30 includes only two upper convex ribs 31, the upper surfaces of the two upper convex ribs 31 are flush, and their inner cavities form an equivalent cylindrical cavity. The rod end 52, viewed from above, includes a pair of rounded edges and obtuse-angled edges 521 on both sides. The rod end 52 is inserted into the equivalent cylindrical cavity, and the obtuse-angled edges 521 on both sides are exposed. The cap end 51 covers the area formed by the top hollow sleeve 30 and the rod end 52, which reduces the raw material cost of the positioning pin. The outer edge of the thickness of the cap end 51 includes a guide cone surface 511 that expands from top to bottom.

[0035] Its working principle is as follows: Since the equivalent diameter of the cover end is the diameter of the upper small diameter hole of the stepped hole to be inserted, and the cover end is made of nylon, when the stepped hole of the HP0 pump is aligned, the upper surface of the cover end contacts the HP0 pump, ensuring that the cover end will not damage the stepped hole. After the effective difference of the cover end is inserted into the upper small diameter hole, since the equivalent diameter of the nylon protective sleeve is the diameter of the bottom large diameter hole of the stepped hole to be inserted, and the height of the nylon protective sleeve is equal to the height of the bottom large diameter hole, the nylon protective sleeve and the inner wall of the bottom large diameter hole are fully fitted. The positioning pin is changed from the original all-steel to outer nylon protection, avoiding defects caused by collision and improving the assembly yield of the pump body.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pump body positioning pin, adapted for positioning and installation in a stepped hole, said stepped hole comprising an upper small-diameter hole and a bottom large-diameter hole, characterized in that, It includes: The bottom is fixed, which is a cylindrical structure, and the bottom of the cylindrical structure is provided with an internally recessed threaded positioning hole; Middle connection end; Hollow top sleeve; Nylon protective cover; And nylon protective caps, including cap ends and rod ends; The upper center of the fixed bottom is provided with an upwardly protruding middle connecting end, and the upper part of the middle connecting end is provided with an upwardly protruding top hollow sleeve. The top opening of the top hollow sleeve contains a cavity. The nylon protective sleeve is fitted around the outer circumference of the middle connecting end. The rod end is inserted into the cavity, and the cap end is fitted onto the upper surface of the top hollow sleeve. The equivalent diameter of the cap end is the diameter of the upper small diameter hole of the stepped hole to be inserted. The equivalent diameter of the nylon protective sleeve is the diameter of the bottom large diameter hole of the stepped hole to be inserted. The height of the nylon protective sleeve is equal to the height of the bottom large diameter hole.

2. A pump body positioning pin according to claim 1, characterized in that: The middle connecting end is a stepped column, which includes an upper large-diameter cylindrical connecting end and a lower small-diameter cylindrical connecting end. The height of the small-diameter cylindrical connecting end does not exceed half the height of the upper large-diameter cylindrical connecting end. The inner diameter of the nylon protective sleeve is equal to the outer diameter of the upper large-diameter cylindrical connecting end. The height of the nylon protective sleeve is equal to the sum of the height of the upper large-diameter cylindrical connecting end and the height of the lower small-diameter cylindrical connecting end. After the nylon protective sleeve is fitted onto the outer circumference of the middle connecting end, a portion of space is left at the bottom to be embedded in the gap formed by the small-diameter cylindrical connecting end.

3. A pump body positioning pin according to claim 2, characterized in that: The bottom inner ring of the nylon protective sleeve is provided with a guide cone surface that extends from bottom to top.

4. A pump body positioning pin according to claim 1, characterized in that: The top hollow sleeve is a cylindrical sleeve. At this time, the rod end is a cylindrical rod end, and the cap end is a circular cap end. The outer edge of the thickness of the circular cap end includes a guide cone surface that expands from top to bottom. The bottom circular surface of the circular cap end completely covers the upper outer circular surface of the cylindrical sleeve. The cylindrical rod end is fixedly inserted into the inner cavity of the cylindrical sleeve.

5. A pump body positioning pin according to claim 1, characterized in that: When the top hollow sleeve includes only two upper convex ribs, the upper surfaces of the two upper convex ribs are flush, and their inner cavities form an equivalent cylindrical cavity. The rod end, viewed from above, includes a pair of rounded edges and obtuse-angled edges on both sides. The rod end is inserted into the equivalent cylindrical cavity, with the obtuse-angled edges on both sides exposed. The cap end covers the area formed by the top hollow sleeve and the rod end.

6. A pump body positioning pin according to claim 1, characterized in that: The outer edge of the cap end has a guide cone surface that flares out from top to bottom.

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