Installation and adjustment tool for diesel engine inverted camshaft

Abstract

Provided is an installation and adjustment tool for an inverted camshaft of a diesel engine, wherein a first positioning sleeve is coaxially arranged with a fuel roller guide cylinder seat below it, and a reference line formed by connecting lines at the connection points of a plurality of first positioning sleeves on the positioning plate is located on the same vertical plane as the axis of the camshaft installed in an inverted manner on a bearing housing in a fuel lifting mechanism; a second positioning sleeve is positioned at the upper end of an intake and exhaust roller guide cylinder seat in an intake and exhaust lifting mechanism, and the axis of the second positioning sleeve is located on the vertical center plane of the roller in the intake and exhaust lifting mechanism, and the position of the intake and exhaust roller guide cylinder seat is adjusted so that the upper end of the second positioning sleeve is located on the reference line after being connected to the positioning plate. The present invention ensures the spatial installation position of the camshaft and the relative position of the roller and the camshaft during intake and exhaust, improves the accuracy of intake and exhaust timing, reduces the difficulty of assembling an inverted camshaft, improves installation efficiency and installation accuracy, reduces the occurrence rate of roller guide cylinder eccentric wear, and effectively avoids quality accidents caused by roller guide cylinder eccentric wear.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engines, and in particular relates to an installation and adjustment tool for an inverted camshaft of a diesel engine. Background Art

[0002] The camshaft is an important component of a diesel engine. The crankshaft drives the camshaft through a transmission mechanism. The intake cam and exhaust cam installed on the camshaft control the opening and closing of the valves through the intake and exhaust lifting mechanisms. The fuel cam controls the timing and quantitative fuel supply of the high-pressure oil pump through the injection pump lifting mechanism.

[0003] The installation structure of the multi-speed inverted camshaft is as follows: Figure 1 As shown, the bearing housing 3 is assembled to form a camshaft mounting hole. The bearing housing 3 of each gear is mounted upside down on the fuel roller guide cylinder seat 5 of the corresponding gear. The fuel roller guide cylinder seat 5 is mounted on the plane of the fuselage 4. By controlling the processing accuracy of the bearing housing 3 and relying on the installation accuracy of the bearing housing 3 of each gear, the coaxiality of the cam bearing seat hole and the parallelism with the transmission hole system are guaranteed. The Hafu thick-walled bearing 2 is installed in the bearing seat hole of each gear bearing housing 3. The Hafu thick-walled bearing 2 is fixed to the bearing housing 3 with screws 8. The camshaft 1 is mounted upside down in the Hafu thick-walled bearing 2 in the camshaft bearing housing 3 of each cylinder and supports the operation of the camshaft 1. The bearing housing 3 of each cylinder has higher installation accuracy requirements. The symmetry degree of the bearing housing 3 and the fuselage mounting hole relative to the center of the camshaft mounting hole is required to be 0.02, and the parallelism degree of the bearing housing 3 and the fuselage mounting surface relative to the center of the camshaft mounting hole is required to be 0.01 / 100. During installation, the coaxiality of the camshafts 1 of all cylinders must be guaranteed after installation so that the camshafts 1 can be in the correct state.

[0004] like Figure 2 As shown, the intake and exhaust roller guide cylinder seat 6 of the intake and exhaust lifting mechanism of each gear is installed on the plane of the fuselage 4, and its roller 7 is in contact with the cam piece 9 assembled on the camshaft 1. The intake and exhaust roller guide cylinder seat 6 is installed on the mounting hole of the fuselage 4. The intake and exhaust roller guide cylinder seat 6 needs to be adjusted until the axis of each cylinder roller 7 and the axis of the camshaft 1 are on the same plane to ensure that the intake and exhaust lift meets the requirements.

[0005] After installing the fuel roller guide cylinder seat 5 of each gear and ensuring the relative position of the bearing housing 3 and the camshaft 1, the position of the roller 7 relative to the camshaft 1 is determined. The traditional tooling uses the side of the fuselage 4 as a reference to adjust the position of the intake and exhaust roller guide cylinder seat 6. The tooling 10 for adjusting the intake and exhaust lifting mechanism is installed on the side of the fuselage 4, and the intake and exhaust roller guide cylinder seat 6 is installed in the installation hole of the fuselage 4. The gap A between the intake and exhaust roller guide cylinder seat 6 and the tooling 10 is adjusted to the minimum; since the side positioning of the fuselage 4 is an indirect positioning reference, it is ignored that the adjustment error of the installation of the bearing housing 3 of each gear will cause a change in the position of the camshaft 1, resulting in the axis of the roller 7 of the intake and exhaust lifting mechanism of each cylinder and the axis of the camshaft 1 in space. Misalignment and not being on the same plane will cause the diesel engine's timing lift value to exceed the tolerance, that is, the valve timing is inaccurate; at the same time, if the center line of the roller 7 and the axis of the camshaft 1 form a small angle, it will lead to a quality accident of eccentric wear of the roller guide cylinder 11; the cam piece 9 and the roller 7 are not in good fit, and the line contact is changed into point contact, which produces irregular lateral force, aggravates wear, and shortens the service life of the cam piece 9 and the roller 7. Therefore, there are technical difficulties in the assembly process of the inverted camshaft assembly structure. The original camshaft 1, the injection pump lifting mechanism, and the intake and exhaust lifting mechanism have technical defects in installation, and the adjustment takes a long time and the quality is unstable, which seriously affects the running quality of the diesel engine. Therefore, it is necessary to propose improvements for the above problems. Summary of the invention

[0006] The technical problem solved by the present invention is as follows: a mounting and adjusting tool for an inverted camshaft of a diesel engine is provided, which takes the camshaft as the center reference, and determines a reference line located on the same vertical plane as the camshaft axis through a positioning plate and a first positioning sleeve with the same number as the fuel lifting mechanism, and then adjusts the position of a second positioning sleeve connected to an intake and exhaust roller guide cylinder seat with the same number of rollers as the intake and exhaust lifting mechanism and corresponding to the upper and lower positions, so that the connection position of the second positioning sleeve and the positioning plate is located on the reference line, and the installation of the roller axis of the intake and exhaust lifting mechanism and the camshaft axis on the same vertical plane can be completed, thereby ensuring the spatial installation position of the camshaft and the relative position of the roller and the camshaft during intake and exhaust, improving the accuracy of intake and exhaust timing, reducing the difficulty of assembling the inverted camshaft, improving installation efficiency and installation accuracy, reducing the occurrence rate of roller guide cylinder eccentric wear, effectively avoiding quality accidents of roller guide cylinder eccentric wear, improving the economy of the diesel engine, and making the adjustment operation simple and convenient, effectively saving working time.

[0007] The technical solution adopted by the present invention is an installation and adjustment tool for an inverted camshaft of a diesel engine, comprising a positioning plate, wherein a first positioning sleeve having the same number as a fuel lifting mechanism and a second positioning sleeve having the same number as an intake and exhaust lifting mechanism are provided below the positioning plate, wherein the first positioning sleeve is coaxially arranged with a fuel roller guide sleeve seat in a fuel lifting mechanism installed on a fuselage below the first positioning sleeve, wherein the positioning plate is detachably connected to the upper ends of a plurality of first positioning sleeves and then fixed above the second positioning sleeve, wherein a reference line formed by a connecting line at a connection point of the plurality of first positioning sleeves on the positioning plate and an axis line of a camshaft invertedly installed on a bearing housing in the fuel lifting mechanism are located on the same vertical plane; the second positioning sleeve is positioned at the upper end of the intake and exhaust roller guide sleeve seat in the intake and exhaust lifting mechanism, and the axis line of the second positioning sleeve is located on the vertical center plane of the roller in the intake and exhaust lifting mechanism, wherein the position of the intake and exhaust roller guide sleeve seat is adjusted so that the upper end of the second positioning sleeve is connected to the positioning plate, and the connection position of the second positioning sleeve and the positioning plate is located on the reference line, thereby completing the installation of the roller axis line and the camshaft axis line of the intake and exhaust lifting mechanism in the same vertical plane.

[0008] Among them, the upper end surface of the fuel roller guide cylinder seat is formed with a first mounting hole located on the same vertical center plane as the camshaft installed on the bearing housing, and the positioning boss arranged in the middle of the lower end surface of the first positioning sleeve is coaxially adapted in the first mounting hole.

[0009] Furthermore, a first positioning hole coaxially arranged with the center hole on the upper end face of the first positioning sleeve is formed on the surface of the positioning plate. After the first positioning pin is inserted through the first positioning hole and into the center hole on the upper end face of the first positioning sleeve to position and connect the positioning plate with the first positioning sleeve, the center line of multiple first positioning pins forms a reference line corresponding to and parallel to the camshaft axis line.

[0010] Furthermore, the upper end surface of the intake and exhaust roller guide cylinder seat is formed with a second mounting hole located on the same vertical center line as the roller at its lower end, and a positioning boss arranged in the middle of the lower end surface of the second positioning sleeve is coaxially adapted in the second mounting hole.

[0011] Furthermore, a plurality of second positioning holes located on the reference line are formed on the middle plate surface of the positioning plate, and the second positioning holes and the rollers below them are located on the same vertical center line, and the installation positions of the two intake and exhaust roller guide cylinder seats on the fuselage are adjusted until the second positioning pins passing through the two second positioning holes of the positioning plate are respectively inserted into the second positioning holes at the upper end of the second positioning sleeve below, thereby completing the installation so that the roller axis and the camshaft axis are located on the same vertical plane.

[0012] The advantages of the present invention compared with the prior art are:

[0013] 1. This technical solution takes the camshaft as the central reference, and determines the reference line on the same vertical plane as the camshaft axis through the positioning plate and the first positioning sleeves with the same number as the fuel lifting mechanism, and then adjusts the position of the second positioning sleeves connected to the intake and exhaust roller guide cylinder seat with the same number of rollers as the intake and exhaust lifting mechanism and corresponding to the upper and lower positions, so that the connection position of the second positioning sleeve and the positioning plate is located on the reference line, so that the roller axis of the intake and exhaust lifting mechanism and the camshaft axis can be installed on the same vertical plane, thereby ensuring the spatial installation position of the camshaft and the relative position of the roller and the camshaft during intake and exhaust, and improving the accuracy of intake and exhaust timing;

[0014] 2. In the process of assembling the intake and exhaust lifting mechanism, the technical solution can make the roller axis of the intake and exhaust lifting mechanism parallel to the camshaft axis and located on the same vertical plane, effectively avoiding the deflection of the roller guide cylinder, effectively reducing the occurrence rate of eccentric wear of the roller guide cylinder, and avoiding quality accidents caused by eccentric wear of the roller guide cylinder;

[0015] 3. This technical solution reduces the difficulty of assembling the inverted camshaft, improves the installation efficiency and installation accuracy, improves the economy of the diesel engine, makes the adjustment operation simple and convenient, and effectively saves operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the fuel injection pump lifting mechanism;

[0017] Figure 2 It is a schematic diagram of the structure of the intake and exhaust lifting mechanism;

[0018] Figure 3 It is a schematic diagram of the use status of traditional tooling;

[0019] Figure 4 This is a schematic diagram of the use status of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention Figure 1-2 4. The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0021] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0022] The installation and adjustment tool for the inverted camshaft of a diesel engine comprises a positioning plate 12, and the first positioning sleeves 13 having the same number as the fuel lifting mechanism and the second positioning sleeves 14 having the same number as the intake and exhaust lifting mechanism are arranged below the positioning plate 12. The first positioning sleeves 13 are coaxially arranged with the fuel roller guide cylinder seat 5 in the fuel lifting mechanism installed on the fuselage 4 below the first positioning sleeves 13. The positioning plate 12 is detachably connected to the upper ends of the plurality of first positioning sleeves 13 and then fixed above the second positioning sleeves 14. The reference line formed by the connection line of the plurality of first positioning sleeves 13 at the connection points on the positioning plate 12 is aligned with the inverted camshaft. The axis of the camshaft 1 installed on the bearing housing 3 in the fuel lifting mechanism is located on the same vertical plane; the second locating sleeve 14 is located at the upper end of the intake and exhaust roller guide cylinder seat 6 in the intake and exhaust lifting mechanism, and the axis of the second locating sleeve 14 is located on the vertical center plane of the roller 7 in the intake and exhaust lifting mechanism, and the position of the intake and exhaust roller guide cylinder seat 6 is adjusted so that the upper end of the second locating sleeve 14 is connected to the locating plate 12, and the connection position of the second locating sleeve 14 and the locating plate 12 is located on the reference line, completing the installation of the roller 7 of the intake and exhaust lifting mechanism and the axis of the camshaft 1 on the same vertical plane.

[0023] The first positioning sleeve 13 is coaxially arranged on the fuel roller guide cylinder seat 5 as follows: the upper end surface of the fuel roller guide cylinder seat 5 is formed with a first mounting hole located on the same vertical center plane as the camshaft 1 mounted on the bearing housing 3, and the positioning boss arranged in the middle of the lower end surface of the first positioning sleeve 13 is coaxially adapted in the first mounting hole;

[0024] The connection structure between the positioning plate 12 and the first positioning sleeve 13 is as follows: a first positioning hole coaxially arranged with the center hole of the upper end face of the first positioning sleeve 13 is formed on the surface of the positioning plate 12, and a first positioning pin 15 is inserted through the first positioning hole into the center hole of the upper end face of the first positioning sleeve 13 to position and connect the positioning plate 12 and the first positioning sleeve 13. The center line of multiple first positioning pins 15 forms a reference line corresponding to and parallel to the axis of the camshaft 1.

[0025] The coaxial arrangement structure of the second positioning sleeve 14 on the air intake and exhaust roller guide cylinder seat 6 is as follows: the upper end surface of the air intake and exhaust roller guide cylinder seat 6 is formed with a second mounting hole located on the same vertical center line as the roller 7 at its lower end, and the positioning boss arranged in the middle of the lower end surface of the second positioning sleeve 14 is coaxially adapted in the second mounting hole.

[0026] The connection structure between the positioning plate 12 and the second positioning sleeve 14 is as follows: a plurality of second positioning holes located on the reference line are formed on the middle plate surface of the positioning plate 12, and the second positioning holes and the roller 7 below them are located on the same vertical center line, and the installation positions of the two intake and exhaust roller guide cylinder seats 6 on the fuselage 4 are adjusted until the second positioning pins 16 passing through the two second positioning holes of the positioning plate 12 are respectively inserted into the second positioning holes at the upper end of the second positioning sleeve 14 below, so as to complete the installation in which the axis of the roller 7 and the axis of the camshaft 1 are located on the same vertical plane.

[0027] Two first locating sleeves 13 are installed in the center hole at the upper end of the fuel roller guide cylinder seat 5, and the two first locating holes on the locating plate 12 that are positioned and connected to the first locating sleeve 13 are used to accurately locate the reference line that is parallel to the central axis of the camshaft 1 and located on the same vertical plane. The lower end of the second locating sleeve 14 is coaxially positioned with the center hole at the upper end of the intake and exhaust roller guide cylinder seat 6, and the position of the intake and exhaust roller guide cylinder seat 6 is adjusted. The second locating hole on the locating plate 12 and the second locating sleeve 14 are plugged in through the second locating pin 16 to accurately locate the position of the intake and exhaust roller guide cylinder seat 6, thereby ensuring that the intake and exhaust lifting mechanism and the axis of the camshaft 1 are in the same vertical plane, and the diesel engine valve timing is accurate; at the same time, the two second locating sleeves 14 are installed in the second mounting hole at the upper end of the intake and exhaust roller sleeve seat 6 to ensure that the vertical center line of the roller 7 is located on the vertical center plane of the camshaft 1, which can avoid the roller 7 from being skewed relative to the camshaft 1. For the specific structure, see Figure 4 .

[0028] The technical solution takes the camshaft 1 as the central reference, and determines a reference line located on the same vertical plane as the axis of the camshaft 1 through the positioning plate 12 and the first positioning sleeve 13 with the same number as the fuel lifting mechanism, and then adjusts the position of the second positioning sleeve 14 connected to the intake and exhaust roller guide cylinder seat 6 with the same number of rollers as the intake and exhaust lifting mechanism and corresponding to the upper and lower positions, so that the connection position of the second positioning sleeve 14 and the positioning plate 12 is located on the reference line, and the installation of the axis of the roller 7 of the intake and exhaust lifting mechanism and the axis of the camshaft 1 on the same vertical plane can be completed, thereby ensuring the spatial installation position of the camshaft 1 and the relative position of the roller 7 and the camshaft 1 during intake and exhaust, and improving the accuracy of intake and exhaust timing; during the assembly process of the intake and exhaust lifting mechanism, the axis of the roller 7 of the intake and exhaust lifting mechanism can be parallel to the axis of the camshaft 1 and located on the same vertical plane, effectively avoiding the deflection of the roller guide cylinder 11, effectively reducing the occurrence rate of eccentric wear of the roller guide cylinder 11, and avoiding quality accidents caused by eccentric wear of the roller guide cylinder 11;

[0029] During installation, after the fuel lifting mechanism and camshaft 1 are installed, the lower end of the first locating sleeve 13 is coaxially positioned in the first mounting hole at the upper end of the fuel roller guide sleeve seat 5, and then the locating plate 12 is connected to the two first locating sleeves 13 through the first locating pin 15. The center line of the two first locating pins 15 forms a reference line that corresponds to and is parallel to the axis of the camshaft 1, thereby determining the position of the axis of the camshaft 1; the intake and exhaust roller sleeve seat 6 is moved until the center hole at the upper end of the second locating sleeve 14 coincides with the second locating hole on the locating plate 12, and the second locating pin 16 can be installed normally, namely, the center of the roller 7 of the intake and exhaust lifting mechanism and the vertical center line of the camshaft 1 are located in the same plane, thereby ensuring the accuracy of the intake and exhaust timing and the parallelism of the center of the roller 7 and the center of the camshaft 1.

[0030] This technical solution reduces the difficulty of assembling the inverted camshaft, improves installation efficiency and installation accuracy, improves the economy of the diesel engine, makes the adjustment operation simple and convenient, and effectively saves operation time.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. The installation and adjustment tool for the inverted camshaft of a diesel engine is characterized by: The invention comprises a positioning plate (12), wherein the positioning plate (12) is provided with first positioning sleeves (13) having the same number as the fuel lifting mechanism and second positioning sleeves (14) having the same number as the intake and exhaust lifting mechanism below the positioning plate (12), wherein the first positioning sleeve (13) is coaxially arranged with a fuel roller guide cylinder seat (5) in the fuel lifting mechanism installed on a fuselage (4) below the first positioning sleeve (13), wherein the positioning plate (12) is fixed above the second positioning sleeve (14) after being detachably connected to the upper ends of the plurality of first positioning sleeves (13), wherein the reference line formed by the connection between the plurality of first positioning sleeves (13) on the positioning plate (12) and the central axis of the fuel lifting mechanism installed in an inverted manner are The axis of the camshaft (1) on the bearing housing (3) is located on the same vertical plane; the second positioning sleeve (14) is positioned at the upper end of the intake and exhaust roller guide cylinder seat (6) in the intake and exhaust lifting mechanism, and the axis of the second positioning sleeve (14) is located on the vertical center plane of the roller (7) in the intake and exhaust lifting mechanism, and the position of the intake and exhaust roller guide cylinder seat (6) is adjusted so that the upper end of the second positioning sleeve (14) is connected to the positioning plate (12), and the connection position of the second positioning sleeve (14) and the positioning plate (12) is located on the reference line, thereby completing the installation in which the axis of the roller (7) of the intake and exhaust lifting mechanism and the axis of the camshaft (1) are located on the same vertical plane.

2. The installation and adjustment tool for the inverted camshaft of a diesel engine according to claim 1, characterized in that: The upper end surface of the fuel roller guide cylinder seat (5) is formed with a first mounting hole located on the same vertical center plane as the camshaft (1) mounted on the bearing housing (3), and a positioning boss arranged in the middle of the lower end surface of the first positioning sleeve (13) is coaxially adapted in the first mounting hole.

3. The installation and adjustment tool for the inverted camshaft of a diesel engine according to claim 2, characterized in that: The positioning plate (12) is provided with a first positioning hole coaxially arranged with the center hole of the upper end face of the first positioning sleeve (13). After the positioning plate (12) and the first positioning sleeve (13) are positioned and plugged together by a first positioning pin (15) inserted through the first positioning hole into the center hole of the upper end face of the first positioning sleeve (13), a center line connecting the plurality of first positioning pins (15) forms a reference line corresponding to and parallel to the axis of the camshaft (1) from top to bottom.

4. The installation and adjustment tool for the inverted camshaft of a diesel engine according to claim 1, characterized in that: The upper end surface of the air intake and exhaust roller guide cylinder seat (6) is provided with a second mounting hole located on the same vertical center line as the roller (7) at its lower end, and a positioning boss provided at the middle of the lower end surface of the second positioning sleeve (14) is coaxially adapted in the second mounting hole.

5. The installation and adjustment tool for the inverted camshaft of a diesel engine according to claim 4, characterized in that: A plurality of second positioning holes located on the reference line are formed on the middle plate surface of the positioning plate (12), and the second positioning holes and the rollers (7) below them are located on the same vertical center line. The installation positions of the two intake and exhaust roller guide cylinder seats (6) on the fuselage (4) are adjusted until the second positioning pins (16) passing through the two second positioning holes of the positioning plate (12) are respectively inserted into the second positioning holes at the upper end of the second positioning sleeve (14) below, so that the installation is completed so that the axis of the roller (7) and the axis of the camshaft (1) are located on the same vertical plane.

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