U-shaped sealing ring installation tool and installation method for high-pressure oil pump

Abstract

The present invention discloses a U-shaped sealing ring installation tool and installation method for a high-pressure oil pump. The installation tool includes an assembly sleeve, an installation cone, an expansion sleeve and a screw. The inner hole of the assembly sleeve and the blind hole at one end of the installation cone are both matched with the outer circle clearance of the plunger. The assembly sleeve is sleeved on the middle part of the plunger, and the installation cone is sleeved on the other end of the plunger. The U-shaped sealing ring sleeved on the middle part of the plunger is located between the installation cone and the assembly sleeve. One end of the screw is screwed into the threaded hole at the end of the other end of the installation cone, and the blind hole at one end of the expansion sleeve is sleeved on the installation cone, and the blind hole is matched with the outer circle clearance of the installation cone. The installation method includes 1) heating the U-shaped sealing ring, 2) installing the assembly sleeve and the installation cone in sequence, and 3) installing the expansion sleeve, and installing the U-shaped sealing ring in place through the expansion sleeve. The installation tool of the present invention has a simple structure and a simple and accurate method of use, which ensures the precise installation position of the U-shaped sealing ring on the plunger, improves installation efficiency, and avoids installation risks.

Description

Technical Field

[0001] The invention relates to an installation tool for an oil pump sealing ring, in particular to an installation tool and a method for installing the sealing ring on a pump core of a high-pressure oil pump, belonging to the technical field of diesel engine assembly. Background Art

[0002] High-pressure fuel pumps are commonly used to deliver fuel in internal combustion engines and are a key component of diesel engine fuel supply systems. Their fundamental function is to provide high-pressure diesel fuel to the injectors in a timely and quantitative manner. High-pressure fuel pumps are crucial to the proper operation of diesel engines. During on-site commissioning of diesel engines, the pump core and plunger must be removed to adjust the thickness of the gasket inside the pump core and thereby adjust the plunger lift. However, the existing method of manually installing a U-shaped sealing ring on the plunger can easily damage the U-shaped ring, and during installation, it is difficult to quickly and accurately install the U-shaped ring in its correct position in the middle of the plunger, resulting in oil leakage from the high-pressure fuel pump. Summary of the Invention

[0003] The purpose of the present invention is to provide a U-shaped sealing ring installation tool and an installation method for a high-pressure oil pump, so as to improve the installation quality and installation efficiency of the U-shaped sealing ring.

[0004] The present invention is achieved through the following technical solutions:

[0005] A U-shaped sealing ring installation tool for a high-pressure oil pump includes an assembly sleeve, an assembly cone, an expansion sleeve and a screw. The inner hole of the assembly sleeve and the blind hole at one end of the assembly cone are both clearance-matched with the outer circle of the plunger. The assembly sleeve is sleeved on the middle part of the plunger, and one end of the assembly sleeve rests on the crosshead end face in the middle part of the plunger. The outer peripheral surface of the other end of the assembly sleeve is provided with an annular groove and an annular step in sequence, and the outer peripheral surface of the port at the other end of the assembly sleeve is an outer conical surface; the blind hole at one end of the assembly cone is sleeved on the other end of the plunger, and the bottom surface of the blind hole rests on the other end of the plunger. On the end head, the U-shaped sealing ring sleeved on the middle part of the plunger is located between the end face of one end of the mounting cone and the end face of the other end of the mounting sleeve; the outer circumferential surface of the end head of the other end of the mounting cone is a conical outer circumferential surface, and a threaded hole communicating with the blind hole is provided in the center of the end head of the other end of the mounting cone, and an exhaust hole communicating with the blind hole is also axially provided on the end head of the other end of the mounting cone, and one end of the screw is screwed into the threaded hole; the blind hole at one end of the expansion sleeve is sleeved on the mounting cone, and the blind hole is clearance-matched with the outer circle of the mounting cone, and the other end of the screw passes through the center hole of the other end of the expansion sleeve.

[0006] The purpose of the present invention can be further achieved by the following technical measures:

[0007] Furthermore, one end of the expansion sleeve is provided with an inner tapered hole connected to the blind hole of the expansion sleeve, and the inner tapered hole matches the tapered outer circumference of the other end of the assembly sleeve; the small end of the inner tapered hole is connected to the adjacent positioning countersunk hole, and the positioning countersunk hole matches the outer circle of the U-shaped sealing ring; when the U-shaped sealing ring is pushed into place, one end face of the U-shaped sealing ring rests on the bottom surface of the positioning countersunk hole, and the two ends of the positioning countersunk hole are respectively connected to the small end of the inner tapered hole and one end of the blind hole of the expansion sleeve; one end of the expansion sleeve rests on the corresponding end face of the annular step at the other end of the assembly sleeve, and the inner tapered hole and the tapered outer circumference of the end of the other end of the assembly sleeve fit each other.

[0008] Furthermore, the taper of the tapered outer peripheral surface of the other end of the assembly sleeve and the taper of the inner tapered hole of one end of the expansion sleeve are both 1:10.

[0009] Furthermore, a locking ring groove is provided on the outer circumference of one end of the expansion sleeve, and the rubber ring is sleeved in the locking ring groove to lock the end of the expansion sleeve, and an arc groove is provided on the outer circumference of the other end of the expansion sleeve.

[0010] Furthermore, the materials of the assembly sleeve, the installation cone and the expansion sleeve are all Teflon.

[0011] A method for installing a U-shaped sealing ring installation tool for a high-pressure oil pump comprises the following steps:

[0012] 1) Preparation before installation: first remove the oil injection pipe attached to the high-pressure oil pump and clean the outside, then use special tools to remove the plunger of the high-pressure oil pump, remove the damaged U-shaped sealing ring and clean the plunger of the high-pressure oil pump;

[0013] 2) Use a hot air gun to heat the U-shaped sealing ring so that it expands due to heat and increases its inner diameter for easy installation;

[0014] 3) Install the assembly sleeve, put the assembly sleeve on the middle of the plunger, make one end of the assembly sleeve rest against the crosshead end face in the middle of the plunger, and manually put the heated U-shaped sealing ring on the plunger;

[0015] 4) Install the cone and push the U-shaped sealing ring to the corresponding position of the plunger. Screw one end of the screw into the threaded hole in the center of the other end of the cone. Then, holding the other end of the screw, put the blind hole on one end of the cone on one end of the plunger. Then, use the cone to push the U-shaped sealing ring on the plunger until the bottom of the blind hole on one end of the cone rests on the other end of the plunger. Use the cone to push the U-shaped sealing ring to the corresponding position of the plunger.

[0016] 5) Install the expansion sleeve and install the U-shaped sealing ring in place through the expansion sleeve; first put the rubber ring into the locking ring groove at one end of the expansion sleeve to lock the expansion sleeve, then hold the arc groove at the other end of the expansion sleeve, put the expansion sleeve blind hole at one end of the expansion sleeve on the installation cone, and push the expansion sleeve toward the assembly sleeve until one side of the U-shaped sealing ring rests on the end face of the positioning countersunk hole at one end of the expansion sleeve, and the other end of the expansion sleeve rests on the annular step at the other end of the assembly sleeve, and the inner tapered hole of the expansion sleeve fits with the tapered outer circumference of the other end of the assembly sleeve, completing the installation of the U-shaped sealing ring;

[0017] 6) Disassemble the tooling, first remove the expansion sleeve and the installation cone, then remove the crosshead in the middle of the plunger, remove the assembly sleeve on the middle of the plunger and then install the crosshead, and finally install the plunger with the U-shaped sealing ring installed into the pump core of the high-pressure oil pump.

[0018] Furthermore, in step 2), the heating temperature of the hot air gun is 140° C. to 150° C.

[0019] The installation tool of the present invention has a simple structure and is easy and accurate to use. It only requires three pipe fittings: an assembly sleeve, an installation cone, and an expansion sleeve. The other end of the expansion sleeve is placed against the annular step at the other end of the assembly sleeve, and the inner tapered hole of the expansion sleeve is aligned with the tapered outer circumference of the other end of the assembly sleeve. This allows the U-shaped sealing ring to be quickly installed on the plunger. This prevents the U-shaped sealing ring from being damaged by the sharp edge of the plunger and ensures the precise installation position of the U-shaped sealing ring on the plunger, making it easier to install the plunger with the U-shaped sealing ring installed into the pump core of the high-pressure oil pump. This improves installation efficiency and avoids installation risks.

[0020] The advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the installation tool of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] like Figure 1As shown, the installation tool of this embodiment includes an assembly sleeve 1, an installation cone 2, an expansion sleeve 3 and a screw 4. The inner hole 11 of the assembly sleeve and the blind hole 21 at one end of the assembly cone 2 are both clearance-matched with the outer circle of the plunger 10. The assembly sleeve 1 is sleeved on the middle part of the plunger 10, and the left end of the assembly sleeve 1 abuts against the end face of the crosshead 101 in the middle part of the plunger 10. The outer peripheral surface of the right end of the assembly sleeve 1 is sequentially provided with an annular groove 12 and an annular step 13, and the outer peripheral surface of the port at the right end of the assembly sleeve 1 is an outer conical surface 14. The blind hole 21 at the left end of the installation cone 2 is sleeved on the right end of the plunger 10, and the bottom surface of the blind hole 21 abuts against the right end head of the plunger 10, so that the installation cone 2 is positioned on the middle part of the plunger 10. The U-shaped sealing ring 20 is located between the left end face of the installation cone 2 and the right end face of the assembly sleeve 1. The outer peripheral surface of the right end of the mounting cone 2 is a conical outer peripheral surface that facilitates the insertion of the expansion sleeve 3. A threaded hole 22 communicating with the blind hole 21 is provided in the center of the right end of the mounting cone 2. An exhaust hole 23 communicating with the blind hole 21 is also provided axially at the other end of the mounting cone. When the blind hole 21 of the mounting cone 2 is mounted on the plunger 10, the air in the blind hole 21 can be easily discharged. The left end of the screw 4 is screwed into the threaded hole 22 to facilitate pushing the mounting cone 2 to the left on the plunger 10. The expansion sleeve blind hole 31 at the left end of the expansion sleeve 3 is mounted on the mounting cone 2. The expansion sleeve blind hole 31 is clearance-matched with the outer circle of the mounting cone 2. The other end of the screw 4 passes through the center hole 32 at the right end of the expansion sleeve 3.

[0024] The left end of the expansion sleeve 3 is provided with an inner tapered hole 33 connected to the expansion sleeve blind hole 31. The inner tapered hole 33 matches the tapered outer circumference of the right end of the assembly sleeve 1; the small end of the inner tapered hole 33 is connected to the adjacent positioning countersunk hole 34, and the positioning countersunk hole 34 matches the outer circle of the U-shaped sealing ring 20. When the U-shaped sealing ring 20 is pushed into place, one end face of it rests on the bottom surface of the positioning countersunk hole 34. The two ends of the positioning countersunk hole 34 are respectively connected to the small end of the inner tapered hole 33 and the left end of the expansion sleeve blind hole 31. The left end of the expansion sleeve 3 rests on the corresponding end face of the annular step 13 at the right end of the assembly sleeve 1, and the inner tapered hole 33 and the tapered outer circumference of the right end of the assembly sleeve 1 fit each other. The taper of the tapered outer circumference of the right end of the assembly sleeve 1 and the taper of the inner tapered hole 33 at the left end of the expansion sleeve 3 are both 1:10.

[0025] The outer circumference of the left end of the expansion sleeve 3 is provided with a locking ring groove 35, and the rubber ring 5 is sleeved in the locking ring groove 35 to lock the left end of the expansion sleeve 3. The outer circumference of the right end of the expansion sleeve 3 is provided with an arc groove 36.

[0026] A method for installing a U-shaped sealing ring installation tool for a high-pressure oil pump comprises the following steps:

[0027] 1) Preparation before installation: First remove the high-pressure oil pump's auxiliary injection pipe and clean the outside. Then use special tools to remove the high-pressure oil pump's plunger 10, remove the damaged U-shaped sealing ring 20, and clean the high-pressure oil pump's plunger 10.

[0028] 2) Use a hot air gun to heat the U-shaped sealing ring 20 to 145°C so that it expands due to heat and increases its inner diameter for easy installation.

[0029] 3) Install the assembly sleeve 1, put the assembly sleeve 1 on the middle part of the plunger 10, make the left end of the assembly sleeve 1 rest against the end face of the crosshead 101 in the middle part of the plunger 10, and manually put the heated U-shaped sealing ring 20 on the plunger 10.

[0030] 4) Install the cone 2 and push the U-shaped sealing ring 20 to the corresponding position of the plunger 10. Screw the left end of the screw 4 into the threaded hole 22 in the center of the right end of the installing cone 2. Then, holding the right end of the screw 4, put the blind hole 21 on the left end of the installing cone 2 on the right end of the plunger 10. Then use the installing cone 2 to push the U-shaped sealing ring 20 on the plunger 10 until the bottom surface of the blind hole 21 on the left end of the installing cone 2 rests on the right end of the plunger 10. Push the U-shaped sealing ring 20 to the corresponding position of the plunger 10 at the left end of the installing cone 2.

[0031] 5) Install the expansion sleeve 3 and secure the U-shaped sealing ring 20 in place through the expansion sleeve 3. First, insert the rubber ring 5 into the locking ring groove 35 on the left end of the expansion sleeve 3 to lock the left end of the expansion sleeve 3. Then, holding the arc-shaped groove 36 on the right end of the expansion sleeve 3, insert the expansion sleeve blind hole 31 at one end of the expansion sleeve 3 onto the installation cone 2. Push the expansion sleeve 3 toward the assembly sleeve 1 until the right side of the U-shaped sealing ring 20 abuts against the end face of the positioning countersunk hole 35 on the left end of the expansion sleeve 3, and the other left end of the expansion sleeve 3 abuts against the annular step 13 on the right end of the assembly sleeve 1. The inner tapered hole 33 of the expansion sleeve 3 and the tapered outer circumference of the right end of the assembly sleeve 1 are in contact with each other, completing the installation of the U-shaped sealing ring 5.

[0032] 6) Disassemble the tooling, first remove the expansion sleeve 3 and the installation cone 2 respectively, then remove the crosshead 101 in the middle of the plunger 10, remove the assembly sleeve 1 on the middle of the plunger 10 and then install the crosshead 101, finally install the plunger 10 with the U-shaped sealing ring 20 installed into the pump core of the high-pressure oil pump.

[0033] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A method for installing a U-shaped sealing ring installation tool for a high-pressure oil pump, characterized in that: The outer circumference of the other end of the assembly sleeve is provided with an annular groove and an annular step in sequence, and the outer circumference of the port at the other end of the assembly sleeve is an outer conical surface; the blind hole at one end of the assembly cone sleeve is sleeved on the other end of the plunger, and the bottom surface of the blind hole is against the end head of the other end of the plunger, and the U-shaped sealing ring sleeved on the middle of the plunger is located between the end face of one end of the installation cone and the end face of the other end of the assembly sleeve; the outer circumference of the other end of the installation cone cylinder is a conical outer circumference, and the center of the end head of the other end of the installation cone cylinder is provided with a threaded hole communicating with the blind hole, and the end head of the other end of the installation cone cylinder is also axially provided with an exhaust hole communicating with the blind hole, and one end of the screw is screwed into the threaded hole; the expansion sleeve at one end of the expansion sleeve The blind hole of the sleeve is sleeved on the mounting cone, and the blind hole of the expansion sleeve cooperates with the outer circle gap of the mounting cone, and the other end of the screw passes through the center hole of the other end of the expansion sleeve, and one end of the expansion sleeve is provided with an inner tapered hole connected to the blind hole of the expansion sleeve, and the inner tapered hole matches the tapered outer circumference of the other end port of the assembly sleeve; the small end end of the inner tapered hole is connected to the adjacent positioning countersunk hole, and the positioning countersunk hole matches the outer circle of the U-shaped sealing ring; when the U-shaped sealing ring is pushed into place, one end face of the U-shaped sealing ring rests on the bottom surface of the positioning countersunk hole, and the two ends of the positioning countersunk hole are respectively connected with the small end of the inner tapered hole and one end of the blind hole of the expansion sleeve; one end of the expansion sleeve rests on the corresponding end face of the annular step at the other end of the assembly sleeve, and the inner tapered hole and the tapered outer circumference of the other end head of the assembly sleeve fit each other; the outer circumferential surface of one end of the expansion sleeve is provided with a locking ring groove, and the rubber ring is sleeved in the locking ring groove to lock the end head of the expansion sleeve, and the outer circumferential surface of the other end of the expansion sleeve is provided with an arc groove; The following steps are involved: 1) Preparation before installation: first remove the oil injection pipe attached to the high-pressure oil pump and clean the outside, then use special tools to remove the plunger of the high-pressure oil pump, remove the damaged U-shaped sealing ring and clean the plunger of the high-pressure oil pump; 2) Use a hot air gun to heat the U-shaped sealing ring so that it expands due to heat and increases its inner diameter for easy installation; 3) Install the assembly sleeve, put the assembly sleeve on the middle of the plunger, make one end of the assembly sleeve rest against the crosshead end face in the middle of the plunger, and manually put the heated U-shaped sealing ring on the plunger; 4) Install the cone and push the U-shaped sealing ring to the corresponding position of the plunger; screw one end of the screw into the threaded hole in the center of the other end of the cone, then hold the other end of the screw and put the blind hole on one end of the cone over the other end of the plunger. Then use the cone to push the U-shaped sealing ring on the plunger until the bottom of the blind hole on one end of the cone rests on the other end of the plunger. Push the U-shaped sealing ring to the corresponding position of the plunger with the end of the cone. 5) Install the expansion sleeve and install the U-shaped sealing ring in place through the expansion sleeve; first put the rubber ring into the locking ring groove at one end of the expansion sleeve to lock one end of the expansion sleeve, then hold the arc groove at the other end of the expansion sleeve, put the expansion sleeve blind hole at one end of the expansion sleeve on the installation cone, and push the expansion sleeve toward the assembly sleeve until one side of the U-shaped sealing ring abuts against the positioning countersunk end face of one end of the expansion sleeve, and the end of the expansion sleeve abuts against the annular step at the other end of the assembly sleeve, and the inner tapered hole of the expansion sleeve fits with the tapered outer circumference of the other end of the assembly sleeve, completing the installation of the U-shaped sealing ring; 6) Disassemble the tooling, first remove the expansion sleeve and the installation cone, then remove the crosshead in the middle of the plunger, remove the assembly sleeve on the middle of the plunger and then install the crosshead, finally install the plunger with the U-shaped sealing ring into the pump core of the high-pressure oil pump.

2. The method for installing the U-shaped sealing ring installation tool of the high-pressure oil pump according to claim 1, characterized in that: The taper of the tapered outer peripheral surface of the other end of the assembly sleeve and the taper of the inner tapered hole of one end of the expansion sleeve are both 1:

10.

3. The method for installing the U-shaped sealing ring installation tool of the high-pressure oil pump according to claim 1, characterized in that: The materials of the assembly sleeve, the installation cone and the expansion sleeve are all Teflon.

4. The method for installing the U-shaped sealing ring installation tool of the high-pressure oil pump according to claim 1, characterized in that: In step 2), the heating temperature of the hot air gun is 140° C. to 150° C.

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