A diesel engine camshaft bushing installation device and method

Abstract

The application discloses a diesel engine camshaft bushing mounting device and method, which comprises a guide sleeve, a tension rod, and a first positioning assembly. The guide sleeve comprises a first connecting section, a second connecting section and a third connecting section. The first connecting section, the second connecting section and the third connecting section are internally connected and are provided with internal threads. The surface of the second connecting section is provided with retractable steel balls. The third connecting section is provided with a plug hole. The tension rod comprises a screw rod, a coupling sleeve and a connecting rod. One end of the screw rod is connected with the coupling sleeve. One end of the coupling sleeve is connected with the connecting rod. The outer side surface of the connecting rod is provided with external threads. The external thread end of the connecting rod is matched with the internal threads in the guide sleeve. The first positioning assembly comprises a plug rod, a track hole and a threaded hole. The diesel engine camshaft bushing mounting device and method can be used to install the camshaft bushing in a narrow space with the aid of special tools, while the installation precision is ensured, and the use convenience is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of diesel engine camshaft technology, specifically to a diesel engine camshaft bushing installation device and method. Background Technology

[0002] The camshaft bushing of a high-speed, high-power diesel engine is a crucial component. After prolonged use, the camshaft bushing will experience some wear. If the wear is severe enough that the fit between the bushing and the camshaft no longer meets technical requirements, replacement is necessary.

[0003] The replacement of camshaft bushings for marine diesel engines is generally carried out inside the ship's hold. Since the ship's hold is a closed space, there are extremely strict requirements for the storage and use of liquid nitrogen. It is difficult to assemble the bushings on the maintenance site according to the normal cold assembly process. At present, most of the shaft hole bushings of large and medium-sized diesel engines are interference fit. The common installation method is to install them with tooling after cooling with liquid nitrogen. Because the space where some shaft holes are located is small, there are great limitations on the size of the tooling. There are also situations where emergency maintenance is needed, but the space where the equipment is located is too small for the operators to deploy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a diesel engine camshaft bushing installation device and method, which can install camshaft bushings in a confined space with the help of special tools, while ensuring installation accuracy, and can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine camshaft bushing mounting device, comprising:

[0006] The guide sleeve includes a first connecting section, a second connecting section, and a third connecting section. The first connecting section, the second connecting section, and the third connecting section are internally connected and have internal threads. The surface of the second connecting section is provided with retractable steel balls, and the third connecting section is provided with insertion holes.

[0007] A tension rod includes a screw, a connecting sleeve, and a connecting rod. One end of the screw is connected to the connecting sleeve, and one end of the connecting sleeve is connected to the connecting rod. The outer side of the connecting rod is provided with an external thread, and the external thread end of the connecting rod mates with the internal thread inside the guide sleeve.

[0008] The first positioning component includes a rod, a track hole, and a threaded hole. The track hole extends laterally through the rod, and the threaded hole is located at the top of the rod. The track hole and the threaded hole do not intersect.

[0009] The guide sleeve has an inner hole that mates with the outer side of the first connecting section of the guide sleeve, and the outer side of the guide sleeve mates with the camshaft bushing seat hole.

[0010] A cover plate, wherein a first hole and a second hole are provided on the cover plate, the first hole is located in the middle of the cover plate, and there are two second holes, which are symmetrically arranged on both sides of the first hole;

[0011] The second positioning component includes a pin, a connecting block, and a circular guide rail. The pin and the connecting block are connected by a thread, and the circular guide rail is fixedly connected to the connecting block. The pin and the circular guide rail are distributed at right angles. The circular guide rail mates with a track hole in the first positioning component. The circular guide rail has graduations evenly distributed along its length.

[0012] The bracket is fixed to the side of the bearing housing.

[0013] As a preferred embodiment of the present invention, stepped surfaces are processed between the first connecting segment and the second connecting segment, and between the second connecting segment and the third connecting segment.

[0014] As a preferred embodiment of the present invention, a groove is provided on the second connecting section, and a spring is provided in the groove, with the upper end of the spring connected to a steel ball.

[0015] As a preferred embodiment of the present invention, the screw and the connecting sleeve are connected by a connecting shaft, one end of the connecting shaft is threadedly connected to the screw, and the other end of the connecting shaft is located inside the connecting sleeve.

[0016] As a preferred embodiment of the present invention, a one-way planar thrust bearing is provided between the connecting shaft and the connecting sleeve located inside the connecting sleeve.

[0017] A method for installing a diesel engine camshaft bushing mounting device includes the following steps:

[0018] S1: Fit the camshaft bushing to be installed onto the second connecting section of the guide sleeve, and manually rotate the camshaft bushing so that the steel ball at the second connecting section engages with the oil hole on the camshaft bushing.

[0019] S2: Fit the guide sleeve onto the first connecting section of the guide sleeve, then place the guide sleeve into the camshaft bushing seat hole. The connecting rod in the tension rod passes through the through hole on the bracket and is connected to the internal thread at the first connecting section. The screw in the tension rod is threaded with a nut on its outer side.

[0020] S3: The second holes at both ends of the cover plate are fixed to the bearing housing mating surface by through bolts. The first positioning component is placed below the cover plate so that the insert rod is inserted into the main oil passage hole of the bearing housing. The cover plate and the first positioning component are connected to the threaded hole by screws passing through the first hole.

[0021] S4: Insert the circular guide rail in the second positioning component into the track hole in the first positioning component, then insert one end of the pin into the insertion hole of the guide sleeve, and then thread the other end of the pin to the connecting block.

[0022] S5: Manually rotate the nut. When the camshaft bushing contacts the side of the bearing housing, record the value on the scale. Calculate the distance from the main oil passage hole to the camshaft bushing oil hole. Continue rotating the nut until the value on the scale reaches the calculated value. At this time, the main oil passage hole and the camshaft bushing oil hole are completely connected, and the installation of the camshaft bushing is completed.

[0023] S6: Check the taper and ovality of the camshaft bushing after installation, check the coaxiality of the through-core shaft, and check whether the axial transmission meets the qualitative qualification standards.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The diesel engine camshaft bushing installation device and method install guide sleeves and tension rods on both sides of the camshaft bushing seat hole, and use the tension rods to allow the camshaft bushing sleeve fitted on the outside of the guide sleeve to enter into the camshaft bushing seat hole, thereby realizing the installation of the camshaft bushing in a narrow space without the need for liquid nitrogen cooling. At the same time, the first positioning component and the second positioning component ensure the accuracy of the camshaft bushing installation. Attached Figure Description

[0025] Figure 1 Schematic diagram of the guide sleeve;

[0026] Figure 2 for Figure 1 Sectional view at point AA;

[0027] Figure 3 This is a schematic diagram of the tension bar structure;

[0028] Figure 4 for Figure 3 Schematic diagram of the structure at point BB;

[0029] Figure 5 This is a schematic diagram of the structure of the first positioning component;

[0030] Figure 6 This is a schematic diagram of the guide sleeve structure;

[0031] Figure 7 This is a schematic diagram of the cover plate structure;

[0032] Figure 8 This is a schematic diagram of the structure of the second positioning component;

[0033] Figure 9 This is a schematic diagram of the combined structure of the present invention;

[0034] Figure 10 for Figure 9 Top view;

[0035] Figure 11 This is a schematic diagram of the installation of the present invention on the bearing housing.

[0036] In the diagram: 1 guide sleeve, 11 first connecting section, 12 second connecting section, 13 third connecting section, 14 insertion hole, 15 steel ball, 16 spring, 2 tension rod, 21 screw, 22 connecting sleeve, 23 connecting rod, 24 connecting shaft, 25 one-way planar thrust bearing, 26 nut, 3 first positioning assembly, 31 insertion rod, 32 track hole, 33 threaded hole, 4 screw, 5 guide sleeve, 6 cover plate, 7 first hole, 8 second hole, 9 second positioning assembly, 91 pin, 92 connecting block, 93 circular guide rail, 94 scale, 10 bracket. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-11 The present invention provides a technical solution: a diesel engine camshaft bushing mounting device, comprising:

[0039] The guide sleeve 1 includes a first connecting section 11, a second connecting section 12 and a third connecting section 13. The first connecting section 11, the second connecting section 12 and the third connecting section 13 are internally connected and have internal threads. The surface of the second connecting section 12 is provided with a retractable steel ball 15, and the third connecting section 13 is provided with a socket 14.

[0040] The tension rod 2 includes a screw 21, a connecting sleeve 22 and a connecting rod 23. One end of the screw 21 is connected to the connecting sleeve 22, and one end of the connecting sleeve 22 is connected to the connecting rod 23. The outer side of the connecting rod 23 is provided with an external thread, and the external thread end of the connecting rod 23 is engaged with the internal thread inside the guide sleeve 1.

[0041] The first positioning component 3 includes a rod 31, a track hole 32 and a threaded hole 33. The track hole 32 extends laterally through the rod 31, and the threaded hole 33 is located at the top of the rod 31. The track hole 32 and the threaded hole 33 do not intersect.

[0042] The inner hole of the guide sleeve 5 is matched with the outer side of the first connecting section 11 of the guide sleeve 1, and the outer side of the guide sleeve 5 is matched with the camshaft bushing seat hole.

[0043] The cover plate 6 has a first hole 7 and a second hole 8. The first hole 7 is located in the middle of the cover plate 6, and there are two second holes 8, which are symmetrically arranged on both sides of the first hole 7.

[0044] The second positioning component 9 includes a pin 91, a connecting block 92, and a circular guide rail 93. The pin 91 and the connecting block 92 are connected by a thread, and the circular guide rail 93 is fixedly connected to the connecting block 92. The pin 91 and the circular guide rail 93 are distributed at right angles. The circular guide rail 93 cooperates with the track hole 32 in the first positioning component 3. The circular guide rail 93 has scales 94 evenly distributed along its length.

[0045] Bracket 10 is fixed to the side of the bearing housing.

[0046] Furthermore, stepped surfaces are machined between the first connecting section 11 and the second connecting section 12, and between the second connecting section 12 and the third connecting section 13, to facilitate the stable fitting of the guide sleeve 5 onto the first connecting section 11, and the fitting of the camshaft bushing onto the second connecting section 12.

[0047] Furthermore, a groove is provided on the second connecting section 12, and a spring 16 is provided in the groove. The upper end of the spring 16 is connected to the steel ball 15, which facilitates the oil hole of the camshaft bushing to constrain the steel ball 15 during installation. This eliminates the need for operators to frequently observe the position of the camshaft bushing, saves installation time, and improves work efficiency.

[0048] Furthermore, the screw 21 and the connecting sleeve 22 are connected by a connecting shaft 24. One end of the connecting shaft 24 is threaded to the screw 21, and the other end of the connecting shaft 24 is located inside the connecting sleeve 22. A one-way planar thrust bearing 25 is provided between the connecting shaft 24 and the connecting sleeve 22. When the screw 21 is subjected to axial force and radial force in the E direction, only the axial force is transmitted to the connecting rod 23, thereby preventing the connecting rod 23 from rotating under radial force.

[0049] A method for installing a diesel engine camshaft bushing includes the following steps:

[0050] S1: Fit the camshaft bushing to be installed onto the second connecting section 12 of the guide sleeve 1, and manually rotate the camshaft bushing so that the steel ball 15 at the second connecting section 12 engages with the oil hole on the camshaft bushing. At this time, a constraint is generated between the guide sleeve 1 and the camshaft bushing.

[0051] S2: The guide sleeve 5 is fitted onto the first connecting section 11 of the guide sleeve 1, and then the guide sleeve 5 is placed in the camshaft bushing seat hole. The connecting rod 23 in the tension rod 2 passes through the through hole on the bracket 10 and is connected to the internal thread at the first connecting section 11. The screw 21 in the tension rod 2 is threaded with a nut 26 on its outer side. The four degrees of freedom of radial movement and corresponding rotation between the guide sleeve 1 and the camshaft bushing seat hole are constrained. In order to make the main oil passage hole correspond to the oil hole on the camshaft bushing, it is still necessary to control the two degrees of freedom of axial movement and rotation around the center line of the camshaft bushing seat hole.

[0052] S3: The second holes 8 at both ends of the cover plate 6 are fixed to the bearing seat mating surface by bolts. The first positioning component 3 is placed below the cover plate 6, so that the insert rod 31 is inserted into the main oil passage hole of the bearing seat. The cover plate 6 and the first positioning component 3 are connected to the threaded hole 33 by screws 4 passing through the first hole 7. At this time, the track hole 32 is parallel to the axial direction of the camshaft bushing seat hole.

[0053] S4: Insert the circular guide rail 93 in the second positioning component 9 into the track hole 32 in the first positioning component 3, then insert one end of the pin 91 into the insertion hole 14 of the guide sleeve 1, and then thread the other end of the pin 91 to the connecting block 92. At this time, the degree of freedom of the guide sleeve 1 to rotate around the center line of the camshaft bushing seat hole is constrained.

[0054] S5: Manually rotate nut 26. When the camshaft bushing contacts the side of the bearing housing, record the value on scale 94. Calculate the distance from the main oil passage hole to the camshaft bushing oil hole. Continue rotating nut 26 until the value on scale 94 reaches the calculated value. At this time, the main oil passage hole and the camshaft bushing oil hole are completely connected. Since the pin 91 and the circular guide rail 93 are constrained, the guide sleeve 1 always moves along the direction of the camshaft bushing seat hole when it moves axially and will not rotate, thus completing the installation of the camshaft bushing.

[0055] S6: Check the taper and ovality of the camshaft bushing after installation, check the coaxiality of the through-core shaft, and check whether the axial transmission meets the qualitative qualification standards.

[0056] This invention enables the installation of camshaft bushings in confined ship cabins using specialized tools, without the need for liquid nitrogen cooling, making it convenient for operators. It also ensures installation accuracy, improves efficiency, and saves time.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diesel camshaft bushing installation device characterized by: The utility model relates to a kind of tension rod and guide sleeve, including: Guide sleeve (1), including first connecting section (11), second connecting section (12) and third connecting section (13), the first connecting section (11), second connecting section (12) and third connecting section (13) inside are connected and are processed with internal thread, the surface of the second connecting section (12) is provided with retractable steel ball (15), the third connecting section (13) is provided with jack (14); Tension rod (2), including screw rod (21), coupling sleeve (22) and connecting rod (23), one end of the screw rod (21) is connected with coupling sleeve (22), one end of the coupling sleeve (22) is connected with connecting rod (23), the outer side of the connecting rod (23) is provided with external thread, and the external thread end of the connecting rod (23) is matched with the internal thread inside the guide sleeve (1); First positioning assembly (3), including plug rod (31), track hole (32) and screw hole (33), the track hole (32) is transversely through plug rod (31), and the screw hole (33) is arranged at the top of plug rod (31), and the track hole (32) and the screw hole (33) are not intersected; Guide sleeve (5), the inner hole of guide sleeve (5) is matched with the outer side of the first connecting section (11) of guide sleeve (1), and the outer side of guide sleeve (5) is matched with camshaft bushing seat hole; Cover plate (6), the first hole (7) and the second hole (8) are arranged on the cover plate (6), the first hole (7) is arranged at the middle position of the cover plate (6), the second hole (8) is two, and is symmetrically arranged on the two sides of the first hole (7), the second hole (8) in the two ends of the cover plate (6) is fixedly connected with bearing seat combination surface by passing through bolt, and the first hole (7) on the cover plate (6) is matched and connected with the screw hole (33) in the first positioning assembly (3) by passing through screw (4); Second positioning assembly (9), including plug pin (91), connecting block (92) and circular guide rail (93), the plug pin (91) is threadedly connected with the connecting block (92), the circular guide rail (93) is fixedly connected with the connecting block (92), the plug pin (91) and the circular guide rail (93) are distributed at right angles, the circular guide rail (93) is matched with the track hole (32) in the first positioning assembly (3), and the circular guide rail (93) is uniformly distributed with scale (94) along its length direction; Support (10) is fixed to the side surface of bearing seat, and the connecting rod (23) in the tension rod (2) is threadedly connected with the guide sleeve (1) by passing through the through hole on the support (10).

2. A diesel engine camshaft bushing installation device as defined in claim 1, characterized in that: The first connecting section (11) and the second connecting section (12), the second connecting section (12) and the third connecting section (13) are all processed with step surface.

3. A diesel camshaft bushing installation device as defined in claim 1, characterized in that: The second connecting section (12) is provided with recess, the spring (16) is arranged in the recess, and the upper end of the spring (16) is connected with the steel ball (15).

4. A diesel camshaft bushing installation device as defined in claim 1, wherein: The screw rod (21) is connected with the joint sleeve (22) through a connecting shaft (24), one end of the connecting shaft (24) is threadedly connected with the screw rod (21), and the other end of the connecting shaft (24) is located in the joint sleeve (22).

5. A diesel engine camshaft bushing mounting device as defined in claim 4 wherein: A one-way flat thrust bearing (25) is arranged between the connecting shaft (24) located in the joint sleeve (22) and the joint sleeve (22).

6. The method of installing a diesel camshaft bushing installation of claim 1, wherein: The method comprises the following steps: S1: The camshaft bushing to be installed is sleeved at the second connecting section (12) of the guide sleeve (1), the camshaft bushing is manually rotated so that the steel ball (15) at the second connecting section (12) is combined with the oil hole on the camshaft bushing; S2: The guide sleeve (5) is sleeved at the first connecting section (11) of the guide sleeve (1), then the guide sleeve (5) is placed in the camshaft bushing seat hole, the connecting rod (23) in the tension rod (2) passes through the through hole on the support (10) and is connected with the internal thread at the first connecting section (11), and the screw rod (21) outside the tension rod (2) is threadedly connected with the nut (26); S3: The second hole position (8) at both ends of the cover plate (6) is fixed on the bearing seat combined surface through a bolt, the first positioning assembly (3) is placed below the cover plate (6), the inserting rod (31) is inserted into the main oil channel hole of the bearing seat, and the cover plate (6) and the first positioning assembly (3) are threadedly connected in the threaded hole (33) through the first hole position (7) and the screw (4); S4: The circular guide rail (93) in the second positioning assembly (9) is inserted into the rail hole (32) in the first positioning assembly (3), then one end of the insertion pin (91) is inserted into the insertion hole (14) of the guide sleeve (1), and the other end of the insertion pin (91) is threadedly connected with the connecting block (92); S5: The nut (26) is manually rotated, the value on the scale (94) is recorded when the camshaft bushing contacts the side surface of the bearing seat, the distance from the main oil channel hole to the oil hole of the camshaft bushing is calculated, the nut (26) is continuously rotated until the value on the scale (94) reaches the calculated value, at this time, the main oil channel hole and the oil hole of the camshaft bushing are completely penetrated, and the installation of the camshaft bushing is completed; S6: The taper and the ovality of the installed camshaft bushing are checked, the coaxiality is detected through the core shaft, and whether the axial transmission meets the qualitative qualification standard is checked.

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