Mounting tool for roller guide cylinder bushing of medium-speed diesel engine

Abstract

The utility model discloses a medium-speed diesel engine roller guide cylinder lining installation tool which comprises a guide shaft, two guide flat keys, a punching sleeve and a lower supporting seat, and the guide flat keys are fixed in key grooves of the guide shaft. A guide gap delta is reserved between the inner hole of the punching sleeve and the outer circle of the guide shaft; the lower supporting base is in an inverted-flat-bottom V shape, and the center of the top of the lower supporting base extends upwards to form a positioning block. The inner sides of the two bevel edges of the inverted flat-bottomed V-shaped lower supporting seat abut against base circles of corresponding cams of the cam shaft respectively, the guide shaft is inserted into a corresponding roller guide cylinder hole of the rack, 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, and the bottom of the guide shaft abuts against the top face of the lower supporting seat. The roller guide cylinder bushing mounting device is simple in structure, the mounting difficulty of the roller guide cylinder bushing is remarkably reduced, and the mounting quality and the mounting efficiency of the roller guide cylinder bushing are improved.

Description

Technical Field

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

[0002] The roller guide bushing is a critical component in the valvetrain of a medium-speed diesel engine. Its function is to precisely guide the roller guide bushing as it rises and falls, preventing the roller at the lower end of the guide bushing from tilting downward and contacting the corresponding cam of the camshaft. Over time, this can cause localized wear at the contact point between the roller guide bushing and the corresponding cam, affecting the operating accuracy of the valvetrain and reducing the service life of the roller guide bushing and the camshaft. In severe cases, this can lead to severe damage to the valvetrain of a medium-speed diesel engine, or even cause the valve to fall into the combustion chamber, causing the entire engine to stop operating.

[0003] Currently, the process of installing the roller guide bushing into the frame relies entirely on the assembler's skill level. First, the roller guide bushing, whose outer diameter has been reduced by 0.03 to 0.05 mm after being cooled to -196°C with liquid nitrogen, is moved to the roller guide seat. Once the roller guide bushing is visually vertical and the center plane of the keyway in the inner hole of the roller guide bushing is parallel to the camshaft axis, the flange ring at the top of the roller guide bushing is evenly struck with a copper rod until the roller guide bushing is lowered into position and the bottom of the flange ring fully rests on the stepped countersunk hole at the top of the roller guide seat. This assembly method has the following drawbacks: it requires a high level of skill and installation experience from the assembler, and there is a risk of frostbite if the operator is not careful. It also cannot ensure that the center plane of the keyway in the roller guide bushing is parallel to the camshaft axis, seriously affecting the installation quality of the roller guide bushing. Utility Model Content

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

[0005] The utility model is achieved through the following technical solutions:

[0006] A medium-speed diesel engine roller guide sleeve bushing installation tool, comprising a guide shaft, two guide flat keys, a punch sleeve and a lower support seat, the two guide flat keys being 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 utility model can be further achieved by the following technical measures.

[0008] Furthermore, the single-side clearance δ between the guide shaft and the inner hole of the punch sleeve is 0.15-0.17 mm; the clearance range between the central positioning groove and the positioning block is 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] This utility model installs the roller guide bushing under the guidance of a guide shaft and a guide flat key, and repeatedly strikes the roller guide bushing with a punch sleeve mounted on the guide shaft to install the roller guide bushing into the roller guide bushing seat hole of the frame. This has a simple structure and low manufacturing cost, significantly reducing the installation difficulty of the roller guide bushing, improving the installation quality and efficiency of the roller guide bushing, and ensuring that the center plane of the keyway in the inner hole of the guide bushing is parallel to the camshaft axis.

[0012] Advantages and features of the present invention will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the roller guide bushing installed using the tooling of the utility model;

[0014] Figure 2 yes Figure 1 AA cross-sectional view;

[0015] Figure 3 yes Figure 1 BB enlarged cross-sectional view;

[0016] Figure 4 yes Figure 1 CC enlarged cross-sectional view. DETAILED DESCRIPTION

[0017] 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 in the roller guide sleeve seat hole 71 of the frame 7 for fuel injection control.

[0018] like Figures 1 to 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. The two guide flat keys 2 are fixed in sequence in the keyway 11 that runs through the guide shaft 1 from top to bottom. The punch sleeve 3 is a stepped shaft sleeve structure. 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 facilitates the punch sleeve 3 to slide up and down and hit the roller guide sleeve 5 under the guidance of the guide shaft 1. The lower support seat 4 is in the shape of an inverted flat bottom V, 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 corresponding cam 61 of the camshaft 6, so that the lower support seat 4 is precisely positioned on the camshaft 6. The guide shaft 1 is inserted into the roller guide sleeve seat hole 71 of the frame 7 for fuel injection control. The symmetric plane of the center of the keyway 11 is parallel to the axis of the camshaft 6, so that the keyway 51 of the inner hole of the roller guide sleeve is precisely 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 .

[0019] Figure 2 The clearance range between the center positioning groove 12 and the positioning block 41 is: 0.04~0.08mm, and 0.06mm 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.

[0020] 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.

[0021] 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 camshaft 6. The guide flat key 2 and the punch sleeve 3 are made of quenched and tempered 45# steel to extend their service life.

[0022] The installation process of the roller guide bushing of a medium-speed diesel engine using this utility model is as follows:

[0023] 1) First, turn the camshaft 6 so that the corresponding cam 61 of the camshaft 6 is in the cam base circle upward position, completing the preparation for the installation of the roller guide sleeve 5.

[0024] 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. Next, vertically insert the guide shaft 1, with the two guide keys 2 already installed, into the corresponding roller guide cylinder seat hole 71 on the frame 7. The positioning block 41 at the top of the lower support seat 4 fits into the center positioning groove 12 at the bottom of the guide shaft 1, and the bottom of the guide shaft 1 rests on the top surface of the lower support seat 4. Adjust the verticality of the guide shaft 1 so that the clearance between the outer diameter of the guide shaft 1 and the roller guide cylinder seat hole 71 is initially consistent. This completes the installation of the guide shaft 1 and the lower support seat 4.

[0025] 3) Place the roller guide bushing 5, which has been cooled to -196°C in liquid nitrogen, onto the guide shaft 1. Rock the guide shaft 1 back and forth, left and right, and adjust its verticality so that the lower edge of the roller guide bushing 5 aligns with the corresponding roller guide seat hole 71 of the frame 7, and the keyway 51 in the inner hole of the roller guide bushing aligns with the guide flat key 2. Then, place the punch sleeve 3 onto the guide shaft 1, and fit the semicircular through groove 311 on one side of the inner hole of the punch sleeve 3 onto the guide flat key 2. Then quickly pull down the punch sleeve 3 and 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 inner hole keyway 51 moves down, and the guide flat key 2 gradually embeds into the roller guide sleeve 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 seat hole 71, and the roller guide sleeve bushing 5 moves down and embeds into the corresponding roller guide sleeve seat hole 71, completing the installation of the first roller guide sleeve bushing 5.

[0026] 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 out of 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.

[0027] 5) Repeat steps 2) to 4) to install the remaining roller guide bushings 5 ​​one by one into the roller guide bushing seat holes 71 for intake control and the roller guide bushing seat holes 71 for exhaust control on the frame 7.

[0028] 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 medium-speed diesel engine roller guide bushing 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 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 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 rest on 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 rests on the top surface of the lower support seat.

2. The medium-speed diesel engine roller guide bushing 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 gap between the center positioning groove and the positioning block ranges from 0.04 to 0.08 mm.

4. The medium-speed diesel engine roller guide bushing installation tool as claimed in claim 1, characterized in that: 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.

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.

Images