Mounting tool and method for roller guide cylinder lining of medium-speed diesel engine

Abstract

The tool comprises a guide shaft, two guide flat keys, a punching sleeve and a lower supporting seat, the inner sides of the two bevel edges of the lower supporting seat abut against a base circle of a cam corresponding to a cam shaft, the guide shaft is inserted into a corresponding roller guide cylinder hole of a rack, and the punching sleeve is inserted into the guide shaft. The central symmetry plane of the key groove is parallel to the axis of the cam shaft. The positioning block is embedded into a central positioning groove in the bottom of the guide shaft. The method comprises the steps that (1) the inner sides of the two bevel edges of the lower supporting base abut against the base circle of a cam corresponding to a cam shaft, (2) the guide shaft is inserted into a corresponding roller guide cylinder base hole in a rack, the roller guide cylinder bush is arranged on the guide shaft in a sleeving mode, and (3) the punching sleeve is arranged on the guide shaft in a sleeving mode and then repeatedly impacts the top face of the roller guide cylinder bush, and installation of the roller guide cylinder bush is completed. The tool is simple in structure, and the installation difficulty of the roller guide cylinder lining is remarkably reduced. According to the method, the mounting quality and the mounting efficiency of the roller guide cylinder bushing are improved.

Description

Technical Field

[0001] The invention relates to an installation tool for a diesel engine valve mechanism, in particular to a parts installation tool and method for a medium-speed (300<n≤1000r / min) diesel engine valve mechanism, belonging to the technical field of diesel engine manufacturing. Background Art

[0002] The roller guide sleeve bushing is an important part of the valve mechanism of a medium-speed diesel engine. Its function is to accurately guide the lifting and lowering of the roller guide sleeve to prevent the roller at the lower end of the roller guide sleeve from moving downward and contacting the corresponding cam of the camshaft. After long-term operation, the roller guide sleeve roller and the corresponding cam of the camshaft will cause local wear at the contact point, which will affect the working accuracy of the valve mechanism and reduce the service life of the roller guide sleeve roller and the camshaft. In severe cases, it will cause deep damage to the valve mechanism of the medium-speed diesel engine, or the valve will fall into the combustion chamber, causing the entire medium-speed diesel engine to stop working.

[0003] At present, the process of installing the roller guide sleeve into the frame is completely dependent on the technical level of the assembler. First, the roller guide sleeve, which has been cooled to -196℃ by liquid nitrogen and has been reduced by 0.03-0.05mm in outer diameter, is moved to the roller guide sleeve seat hole. When the roller guide sleeve is visually in a vertical state and the center plane of the keyway in the inner hole of the roller guide sleeve is parallel to the axis of the camshaft, the flange ring at the top of the roller guide sleeve is evenly knocked with a copper rod until the roller guide sleeve moves down to the position and the bottom of the flange ring is completely against the step countersunk hole at the top of the roller guide sleeve seat hole. The assembly of the roller guide sleeve is completed. This assembly method has the following disadvantages: it requires a high level of technical level and installation experience for the assembler, and there is a risk of frostbite if the operation is not careful; it cannot ensure that the center plane of the keyway in the roller guide sleeve is parallel to the axis of the camshaft, which seriously affects the installation quality of the roller guide sleeve. Summary of the invention

[0004] The purpose of the present invention is to provide a medium-speed diesel engine roller guide sleeve installation tool and method which has a simple structure, is easy to operate and can ensure that the center plane of the keyway of the inner hole of the roller guide sleeve is parallel to the camshaft axis.

[0005] The present invention is achieved through the following technical solutions:

[0006] A medium-speed diesel engine roller guide sleeve bushing installation tool comprises a guide shaft, two guide flat keys, a punch sleeve and a lower support seat, wherein the two guide flat keys are fixed in sequence in keyways that pass through the guide shaft from top to bottom; the punch sleeve is a stepped shaft sleeve structure, and a guide gap δ is left between the inner hole of the punch sleeve and the outer circle of the guide shaft; the lower support seat is in an inverted flat-bottomed V-shape, and a positioning block extends upward from the center of the top of the lower support seat; the inner sides of the two oblique sides of the inverted flat-bottomed V-shaped lower support seat respectively abut against the base circle of the corresponding cam of the camshaft, the guide shaft is inserted into the corresponding roller guide sleeve hole of the frame, the central symmetry plane of the keyway is parallel to the axis of the camshaft, the positioning block is embedded in the central positioning groove at the bottom of the guide shaft, and the bottom of the guide shaft abuts against the top surface of the lower support seat.

[0007] The purpose of the present invention can be further achieved by the following technical measures.

[0008] Furthermore, the single-side clearance between the guide shaft and the inner hole of the punch sleeve is δ=0.15-0.17 mm; the clearance between the central positioning groove and the positioning block is in the range of 0.04-0.08 mm.

[0009] Furthermore, a semicircular through groove is provided on one side of the inner hole of the punch sleeve, and the ratio of the diameter D of the semicircular through groove to the width L of the guide flat key is: D / L=1.72~1.80.

[0010] Furthermore, the guide shaft and the lower support seat are made of aluminum alloy, and the guide flat key and the punch sleeve are made of quenched and tempered 45# steel.

[0011] A method for installing a tooling for a roller guide sleeve bushing of a medium-speed diesel engine comprises the following steps:

[0012] 1) First, turn the camshaft so that the corresponding cam of the camshaft is in the position with the cam base circle facing upward, and prepare for the installation of the roller guide sleeve;

[0013] 2) Then place the inner sides of the two beveled edges of the lower support seat against the base circle of the corresponding cam of the camshaft, and then insert the guide shaft with two guide flat keys installed vertically downward into the corresponding roller guide cylinder seat hole on the frame, and the positioning block on the top of the lower support seat is embedded in the central positioning groove at the bottom of the guide shaft, and the bottom of the guide shaft is against the top surface of the lower support seat; adjust the verticality of the guide shaft so that the gap between the outer circle of the guide shaft and the roller guide cylinder seat hole is initially consistent, and complete the installation of the guide shaft and the lower support seat;

[0014] 3) Put the roller guide sleeve that has been cooled to -196℃ by liquid nitrogen on the guide shaft, shake the guide shaft back and forth and left and right, adjust the verticality of the guide shaft, so that the lower edge of the roller guide sleeve is aligned with the roller guide seat hole corresponding to the frame, and the keyway of the inner hole of the roller guide sleeve is aligned with the guide flat key; then put the punch sleeve on the guide shaft, and put the semicircular through groove on one side of the inner hole of the punch sleeve on the guide flat key; then quickly pull down the punch sleeve, repeatedly hit the top surface of the roller guide sleeve, so that the roller guide sleeve gradually moves down into the roller guide seat hole, the keyway of the inner hole of the roller guide sleeve moves down, and the guide flat key gradually embeds into the keyway of the inner hole of the roller guide sleeve, until the flange ring at the top of the roller guide sleeve abuts against the step hole at the top of the roller guide sleeve seat hole, and the roller guide sleeve moves down and embeds into the corresponding roller guide sleeve seat hole, completing the installation of the first roller guide sleeve;

[0015] 4) After checking that the newly installed roller guide bushing meets the installation requirements, first remove the punch sleeve, then move up the guide shaft and guide flat key, so that the center positioning groove at the bottom of the guide shaft is completely out of the positioning block at the top of the lower support seat, then pull out the guide shaft and guide flat key, and finally remove the lower support seat to complete the installation of the first roller guide bushing;

[0016] 5) Repeat steps 2) to 4) to install the remaining roller guide bushings into the corresponding roller guide seat holes on the frame one by one.

[0017] The present invention installs the roller guide sleeve bushing under the guidance of the guide shaft and the guide flat key, and installs the roller guide sleeve bushing into the roller guide sleeve seat hole of the frame by repeatedly hitting the roller guide sleeve bushing with a punch sleeve sleeved on the guide shaft. The tooling structure is simple and the manufacturing cost is low. The method significantly reduces the installation difficulty of the roller guide sleeve bushing, improves the installation quality of the roller guide sleeve bushing, and significantly improves the installation efficiency of the roller guide sleeve bushing, ensuring that the center plane of the keyway of the inner hole of the guide sleeve bushing is parallel to the camshaft axis.

[0018] Advantages and features of the present invention will be 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

[0019] Figure 1 is a cross-sectional view of a roller guide sleeve bushing installed using the tooling of the present invention;

[0020] Figure 2 yes Figure 1 AA section view;

[0021] Figure 3 yes Figure 1 BB enlarged cross-sectional view;

[0022] Figure 4 yes Figure 1Magnified cross-sectional view of CC. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and an embodiment in which the roller guide sleeve bushing 5 of a V28 / 32SS medium speed diesel engine is installed into the roller guide sleeve seat hole 71 of the frame 7 for fuel injection control.

[0024] like Figure 1 to Figure 4 As shown, the tooling of the present invention includes a guide shaft 1, two guide flat keys 2, a punch sleeve 3 and a lower support seat 4, and the two guide flat keys 2 are fixed in sequence in the keyway 11 that passes through the guide shaft 1 from top to bottom. The punch sleeve 3 is a stepped sleeve structure, and the single-side clearance δ between the guide shaft 1 and the inner hole of the punch sleeve 3 is 0.15-0.17 mm, which is convenient for the punch sleeve 3 to slide up and down and hit the roller guide sleeve bushing 5 under the guidance of the guide shaft 1. The lower support seat 4 is in an inverted flat bottom V shape, and a positioning block 41 extends upward from the center of the top of the lower support seat 4. The inner sides of the two oblique edges 42 of the inverted flat bottom V-shaped lower support seat 4 abut against the base circle of the cam 61 corresponding to the cam shaft 6, so that the lower support seat 4 is accurately positioned on the cam shaft 6. The guide shaft 1 is inserted into the roller guide sleeve seat hole 71 of the frame 7 for fuel injection control, and the central symmetric plane of the keyway 11 is parallel to the axis of the cam shaft 6, so that the keyway 51 of the inner hole of the roller guide sleeve bushing is accurately positioned on the required plane. The positioning block 5 is embedded in the central positioning groove 12 at the bottom of the guide shaft 1 , and the bottom of the guide shaft 1 abuts against the top surface of the lower support seat 4 .

[0025] Figure 2 The clearance range between the center positioning groove 12 and the positioning block 41 is 0.04-0.08 mm, and 0.06 mm in this embodiment, which effectively improves the positioning accuracy of the guide flat key 2, and further improves the installation accuracy of the keyway 51 in the inner hole of the roller guide sleeve bushing.

[0026] Figure 3 A semicircular through groove 311 is provided on the upper side of the inner hole 31 of the middle punch sleeve. The ratio of the diameter D of the semicircular through groove to the width L of the guide flat key is: L / D=1.72~1.80. In this embodiment, L / D=1.76, ensuring that the punch sleeve 3 will not interfere with the guide flat key 2 when moving up and down.

[0027] The guide shaft 1 and the lower support seat 4 are made of aluminum alloy to avoid damaging the roller guide cylinder seat hole 71 and the cam shaft 6. The guide flat key 2 and the punch sleeve 3 are made of quenched and tempered 45# steel to extend the service life.

[0028] A method for installing a tooling for a roller guide sleeve bushing of a medium-speed diesel engine comprises the following steps:

[0029] 1) First, turn the camshaft 6 so that the corresponding cam 61 of the camshaft 6 is in a position with the cam base circle facing upward, completing the preparation for the installation of the roller guide sleeve 5.

[0030] 2) Then place the inner sides of the two beveled edges 42 of the lower support seat 4 against the base circle of the corresponding cam 61 of the camshaft 6, and then vertically insert the guide shaft 1 with two guide flat keys 2 installed into the corresponding roller guide cylinder seat hole 71 on the frame 7, and the positioning block 41 on the top of the lower support seat 4 is embedded in the central positioning groove 12 at the bottom of the guide shaft 1, and the bottom of the guide shaft 1 is against the top surface of the lower support seat 4. Adjust the verticality of the guide shaft 1 so that the gap between the outer circle of the guide shaft 1 and the roller guide cylinder seat hole 71 is initially consistent, and the installation of the guide shaft 1 and the lower support seat 4 is completed.

[0031] 3) Put the roller guide sleeve 5 cooled to -196℃ by liquid nitrogen on the guide shaft 1, shake the guide shaft 1 back and forth and left and right, adjust the verticality of the guide shaft 1, so that the lower edge of the roller guide sleeve 5 is aligned with the roller guide seat hole 71 corresponding to the frame 7, and the keyway 51 of the inner hole of the roller guide sleeve is aligned with the guide flat key 2. Then put the punch sleeve 3 on the guide shaft 1, and put the semicircular through groove 311 on one side of the inner hole of the punch sleeve 3 on the guide flat key 2. Then, the punch sleeve 3 is quickly pulled down to repeatedly hit the top surface of the roller guide sleeve bushing 5, so that the roller guide sleeve bushing 5 gradually moves down into the roller guide sleeve seat hole 71, and the roller guide sleeve bushing inner hole keyway 51 moves down, and the guide flat key 2 gradually embeds into the roller guide sleeve bushing inner hole keyway 51, until the flange ring 52 at the top of the roller guide sleeve bushing 5 abuts against the step hole 711 at the top of the roller guide sleeve bushing seat hole 71, and the roller guide sleeve bushing 5 moves down and embeds into the corresponding roller guide sleeve bushing seat hole 71, completing the installation of the first roller guide sleeve bushing 5.

[0032] 4) After checking that the newly installed roller guide bushing 5 meets the installation requirements, first remove the punch sleeve 3, then move up the guide shaft 1 and the guide key 2, so that the center positioning groove 12 at the bottom of the guide shaft 1 is completely separated from the positioning block 41 at the top of the lower support seat 4, then pull out the guide shaft 1 and the guide key 2, and finally remove the lower support seat 4 to complete the installation of the first roller guide bushing 5.

[0033] 5) Repeat steps 2) to 4) to install the remaining roller guide sleeve bushings 5 ​​one by one into the roller guide sleeve seat holes 71 for intake control and the roller guide sleeve seat holes 71 for exhaust control on the frame 7.

[0034] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A medium-speed diesel engine roller guide sleeve installation tool, characterized in that: It includes a guide shaft, two guide flat keys, a punch sleeve and a lower support seat, the two guide flat keys are fixed in sequence in the keyways that pass through the guide shaft from top to bottom; the punch sleeve is a stepped sleeve structure, and a guide gap δ is left between the inner hole of the punch sleeve and the outer circle of the guide shaft; the lower support seat is in an inverted flat-bottomed V-shape, and a positioning block extends upward from the center of the top of the lower support seat; the two inner sides of the inverted flat-bottomed V-shaped lower support seat abut against the base circle of the corresponding cam of the camshaft, the guide shaft is inserted into the corresponding roller guide cylinder hole of the frame, the central symmetry plane of the keyway is parallel to the axis of the camshaft, the positioning block is embedded in the central positioning groove at the bottom of the guide shaft, and the bottom of the guide shaft abuts against the top surface of the lower support seat.

2. The medium speed diesel engine roller guide sleeve installation tool as claimed in claim 1, characterized in that: The single-side clearance δ between the guide shaft and the inner hole of the punch sleeve is 0.15-0.17 mm.

3. The medium speed diesel engine roller guide bushing installation tool as claimed in claim 1, characterized in that: The clearance range between the central positioning groove and the positioning block is 0.04-0.08 mm.

4. The medium speed diesel engine roller guide sleeve installation tool as claimed in claim 1, characterized in that: A semicircular through groove is arranged on one side of the inner hole of the punch sleeve, and the ratio of the diameter D of the semicircular through groove to the width L of the guide flat key is: D / L=1.72-1.

80.

5. The medium speed diesel engine roller guide bushing installation tool as claimed in claim 1, characterized in that: The guide shaft and the lower support seat are made of aluminum alloy, and the guide flat key and the punch sleeve are made of quenched and tempered 45# steel.

6. A method for using the medium-speed diesel engine roller guide bushing installation tool as claimed in claim 1, characterized in that: The following steps are involved: 1) First, turn the camshaft so that the corresponding cam of the camshaft is in the position with the cam base circle facing upward, and prepare for the installation of the roller guide sleeve; 2) Then place the inner sides of the two beveled edges of the lower support seat against the base circle of the corresponding cam of the camshaft, and then insert the guide shaft with two guide flat keys installed vertically downward into the corresponding roller guide cylinder seat hole on the frame, and the positioning block on the top of the lower support seat is embedded in the central positioning groove at the bottom of the guide shaft, and the bottom of the guide shaft is against the top surface of the lower support seat; adjust the verticality of the guide shaft so that the gap between the outer circle of the guide shaft and the roller guide cylinder seat hole is initially consistent, and complete the installation of the guide shaft and the lower support seat; 3) Put the roller guide sleeve that has been cooled to -196℃ by liquid nitrogen on the guide shaft, shake the guide shaft back and forth and left and right, adjust the verticality of the guide shaft, so that the lower edge of the roller guide sleeve is aligned with the roller guide seat hole corresponding to the frame, and the keyway of the inner hole of the roller guide sleeve is aligned with the guide flat key; then put the punch sleeve on the guide shaft, and put the semicircular through groove on one side of the inner hole of the punch sleeve on the guide flat key; then quickly pull down the punch sleeve, repeatedly hit the top surface of the roller guide sleeve, so that the roller guide sleeve gradually moves down into the roller guide seat hole, the keyway of the inner hole of the roller guide sleeve moves down, and the guide flat key gradually embeds into the keyway of the inner hole of the roller guide sleeve, until the flange ring at the top of the roller guide sleeve abuts against the step hole at the top of the roller guide sleeve seat hole, and the roller guide sleeve moves down and embeds into the corresponding roller guide sleeve seat hole, completing the installation of the first roller guide sleeve; 4) After checking that the newly installed roller guide bushing meets the installation requirements, first remove the punch sleeve, then move up the guide shaft and guide flat key, so that the center positioning groove at the bottom of the guide shaft is completely out of the positioning block at the top of the lower support seat, then pull out the guide shaft and guide flat key, and finally remove the lower support seat to complete the installation of the first roller guide bushing; 5) Repeat steps 2) to 4) to install the remaining roller guide bushings into their corresponding roller guide seat holes on the frame one by one.

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