Valve guide assembly tool

Abstract

This invention provides a valve guide assembly fixture, relating to the field of automotive engine component processing technology. The valve guide assembly fixture includes a first pressing fixture, which comprises a first positioning base plate, positioning pins, a first cylinder head, and fixing screws. Positioning pin holes are provided near the four corners of the upper end of the first positioning base plate. The positioning pins are inserted into the positioning pin holes and have a clearance fit. Two positioning pins are provided, arranged diagonally. The lower large flat surface of the first cylinder head is fixedly mounted on the upper end of the first positioning base plate, and two pin holes on the first cylinder head have a clearance fit with the two positioning pins. In this invention, the fixture mainly includes a positioning base plate, positioning pins, a positioning top plate, a positioning sleeve, a positioning rod, and a pressure rod. This fixture is easy to use, can accurately position the cylinder head angle, effectively ensures the coaxiality and pressing depth of the valve guide during the pressing process with the cylinder head valve guide hole, and has strong pressing quality assurance capabilities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile engine parts processing, in particular to a valve guide assembly tool. BACKGROUND

[0002] The valve guide is a guide device of the engine valve. When the engine is running, the valve guide provides guidance for the valve and transmits heat on the valve rod to the cylinder head through the valve guide. Therefore, when assembling the engine, the valve guide needs to be assembled on the cylinder head.

[0003] During the batch processing of the engine cylinder head, the valve guide assembly generally uses automatic assembly equipment. However, due to factors such as the price of automatic equipment, the manufacturing cycle of the equipment, design optimization changes, and the like, the automatic assembly cannot be realized for the cylinder head sample in the research and development stage. The valve guide assembly can only be performed in a manual press-fitting manner.

[0004] Due to the large gap in reliability and stability between manual assembly and automatic equipment, the valve guide assembly may be inclined, the valve guide may crack, and the cylinder head may be damaged during the assembly process, resulting in poor assembly effect.

[0005] Therefore, the present application provides a valve guide assembly tool to solve the problems in the background art. SUMMARY

[0006] (I) Technical problems to be solved

[0007] In view of the deficiencies in the prior art, the present application provides a valve guide assembly tool, which solves the problem of unreliable quality of original manual press-fitting. In addition, the same structure of the tool can be used for valve guide press-fitting of different types of cylinder heads. The tool is simple to manufacture, easy to use, and easy to adjust, and can fully meet the needs of cylinder head sample valve guide assembly.

[0008] (II) Technical solutions

[0009] To achieve the above object, the present application is implemented by the following technical solutions:

[0010] A valve guide assembly tool, comprising:

[0011] The first pressing fixture consists of a first positioning base plate, positioning pins, a first cylinder head, and fixing screws. The first positioning base plate has positioning pin holes near the four corners at its upper end. The positioning pins are inserted into the positioning pin holes and are clearance-fitted with the positioning pin holes. There are two positioning pins arranged diagonally between them. The lower end of the first cylinder head is fixedly mounted on the upper end of the first positioning base plate. The two pin holes on the first cylinder head are clearance-fitted with the two positioning pins. There are four fixing screws, which pass through the four pin holes on the first cylinder head and are connected to the positioning pin holes on the first positioning base plate.

[0012] The second press-fitting fixture consists of a second positioning base plate, a second cylinder head, a first positioning top plate, a first positioning sleeve, and positioning rods. The second cylinder head is located on the upper end of the second positioning base plate, and the first positioning top plate is located on the upper end of the second cylinder head. The upper end of the first positioning top plate has multiple fixing screw holes, and the middle part of the upper end of the first positioning top plate has multiple positioning sleeve positioning holes. The positioning sleeve positioning holes are aligned with the guide tube installation bottom holes on the second cylinder head. The positioning sleeve positioning holes at both ends are each provided with a first positioning sleeve. There are two positioning rods, and the two positioning rods pass through the inner holes of the two first positioning sleeves and are inserted into the positioning sleeve positioning holes at both ends of the second cylinder head. The fixing screw holes on the first positioning top plate are aligned with the threaded holes on the second cylinder head.

[0013] The third press-fitting fixture consists of a third positioning base plate, a third cylinder head, a second positioning top plate, a second positioning sleeve, a valve guide, and a pressure bar. The third cylinder head is located on the upper end of the third positioning base plate, and the second positioning top plate is located on the upper end of the third cylinder head. Multiple positioning sleeve positioning holes are opened in the middle of the upper part of the second positioning top plate. The positioning sleeve positioning holes are aligned with the guide installation bottom holes opened on the third cylinder head. Second positioning sleeves are provided inside the positioning sleeve positioning holes at both ends. The valve guide is located inside the inner hole of the second positioning sleeve, and the valve guide falls freely along the inner hole of the second positioning sleeve to the opening of the guide installation bottom hole opened on the third cylinder head. A pressure bar is provided inside the inner hole of the second positioning sleeve.

[0014] Furthermore, the diameter of the positioning pin is clearance-fitted with the diameter of the positioning pin hole opened on the first positioning base plate.

[0015] Furthermore, the pin holes on the first cylinder head are clearance-fitted with the positioning pins, and the two pin holes and one side of the lower end of the first cylinder head are accurately positioned. The first positioning base plate is set in an inclined shape, and its inclination angle can make the valve guide mounting hole angle on the first cylinder head perpendicular to the horizontal plane.

[0016] Furthermore, the outer diameter of the first positioning sleeve is clearance-fitted with the inner diameter of the positioning hole of the positioning sleeve opened at the upper end of the first positioning top plate.

[0017] Furthermore, the diameter of the positioning rod is clearance-fitted with the inner diameter of the first positioning sleeve and the inner diameter of the guide pipe mounting bottom hole on the second cylinder head. Through the limiting effect of the positioning rod, the positioning holes of multiple positioning sleeves on the first positioning top plate are aligned with the guide pipe mounting bottom hole opened on the second cylinder head, and the fixing screw holes on the first positioning top plate are aligned with the threaded holes on the second cylinder head.

[0018] Furthermore, the diameter of the pressure bar is clearance-fitted with the inner diameter of the second positioning sleeve.

[0019] Furthermore, the first positioning base plate, the second positioning base plate, and the third positioning base plate all have the same structure.

[0020] Furthermore, the first positioning top plate and the second positioning top plate have the same structure, and the first positioning sleeve and the second positioning sleeve have the same structure.

[0021] (III) Beneficial Effects

[0022] This invention provides a valve guide assembly fixture. It has the following advantages:

[0023] 1. This invention provides a valve guide assembly fixture, which mainly includes a positioning base plate, positioning pin, positioning top plate, positioning sleeve, positioning rod, pressure rod and other structures. This fixture is easy to use, can accurately position the cylinder head angle, effectively ensure the coaxiality and pressing depth of the valve guide with the cylinder head guide hole during the pressing process, and has a strong ability to ensure pressing quality.

[0024] 2. This invention provides a valve guide assembly fixture that can press-fit different models of cylinder head guides. The same fixture structure can be used for pressing-fitting different models of cylinder head guides. At the same time, the fixture is simple to manufacture, easy to use, and easy to adjust, which can fully meet the needs of cylinder head sample guide assembly and has better applicability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the first pressing process of the present invention;

[0026] Figure 2 This is a schematic diagram of the second pressing process of the present invention;

[0027] Figure 3 This is a schematic diagram of the third pressing process of the present invention;

[0028] Figure 4 This is a top view of the positioning base plate structure of the present invention;

[0029] Figure 5This is a schematic front sectional view of the positioning base plate of the present invention;

[0030] Figure 6 This is a schematic diagram of the positioning pin structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the positioning top plate structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the positioning sleeve structure of the present invention;

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

[0034] Figure 10 This is a schematic diagram of the pressure bar structure of the present invention.

[0035] The components are: 1. First positioning base plate; 2. Positioning pin; 3. First cylinder head; 4. Fixing screw; 5. Second positioning base plate; 6. Second cylinder head; 7. First positioning top plate; 8. First positioning sleeve; 9. Positioning rod; 10. Third positioning base plate; 11. Third cylinder head; 12. Second positioning top plate; 13. Second positioning sleeve; 14. Valve guide; 15. Pressure rod. Detailed Implementation

[0036] 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.

[0037] Example:

[0038] like Figures 1-10 As shown, an embodiment of the present invention provides a valve guide assembly tooling, comprising:

[0039] The first pressing fixture consists of a first positioning base plate 1, positioning pins 2, a first cylinder head 3, and fixing screws 4. Positioning pin holes are provided near the four corners of the upper end of the first positioning base plate 1. Positioning pins 2 are inserted into these holes and clearance-fitted with the holes. The diameter of the positioning pins 2 is clearance-fitted with the diameter of the positioning pin holes on the first positioning base plate 1. Two positioning pins 2 are provided, arranged diagonally. The lower large flat surface of the first cylinder head 3 is fixedly mounted on the upper end of the first positioning base plate 1, and the two pin holes on the first cylinder head 3 are... The two positioning pins 2 are fitted with a clearance fit. Four fixing screws 4 are provided. The four fixing screws 4 pass through the four pin holes on the first cylinder head 3 and are connected to the positioning pin holes on the first positioning base plate 1. The pin holes on the first cylinder head 3 are fitted with the positioning pins 2 with a clearance fit. The two pin holes and one side of the lower end of the first cylinder head 3 are accurately positioned. Then, the four fixing screws 4 are used to lock the first cylinder head 3 and the first positioning base plate 1. The first positioning base plate 1 is set in an inclined shape, and its inclination angle can make the valve guide mounting hole angle on the first cylinder head 3 perpendicular to the horizontal plane.

[0040] The second press-fitting fixture consists of a second positioning base plate 5, a second cylinder head 6, a first positioning top plate 7, a first positioning sleeve 8, and a positioning rod 9. The second cylinder head 6 is located on the upper end of the second positioning base plate 5, and the first positioning top plate 7 is located on the upper end of the second cylinder head 6. The upper end of the first positioning top plate 7 has multiple fixing screw holes, and the middle of the upper end of the first positioning top plate 7 has multiple positioning sleeve positioning holes. The positioning sleeve positioning holes are aligned with the guide tube installation bottom holes on the second cylinder head 6. The positioning sleeve positioning holes at both ends are equipped with first positioning sleeves 8, and the outer diameter of the first positioning sleeve 8 is aligned with the positioning sleeve positioning holes on the upper end of the first positioning top plate 7. The inner diameter clearance fit is provided. There are two positioning rods 9, and the two positioning rods 9 pass through the inner holes of the two first positioning sleeves 8 and are inserted into the positioning holes of the positioning sleeves located at both ends on the second cylinder head 6. The fixing screw holes on the first positioning top plate 7 are aligned with the threaded holes on the second cylinder head 6. The diameter of the positioning rod 9 is clearance fit with the inner diameter of the first positioning sleeve 8 and the inner diameter of the guide pipe mounting bottom hole on the second cylinder head 6. Through the limiting effect of the positioning rod 9, the multiple positioning holes of the positioning sleeves on the first positioning top plate 7 are aligned with the guide pipe mounting bottom hole opened on the second cylinder head 6. At the same time, the fixing screw holes on the first positioning top plate 7 are aligned with the threaded holes on the second cylinder head 6.

[0041] The third press-fitting fixture consists of a third positioning base plate 10, a third cylinder head 11, a second positioning top plate 12, a second positioning sleeve 13, a valve guide 14, and a pressure rod 15. The third cylinder head 11 is located on the upper end of the third positioning base plate 10, and the second positioning top plate 12 is located on the upper end of the third cylinder head 11. Multiple positioning sleeve positioning holes are provided in the middle of the upper end of the second positioning top plate 12. These positioning sleeve positioning holes are aligned with the valve guide mounting holes on the third cylinder head 11. Second positioning sleeves 13 are installed inside the positioning sleeve positioning holes at both ends. The valve guide 14 is located inside the inner hole of the second positioning sleeve 13, and the valve guide 14 falls freely along the inner hole of the second positioning sleeve 13 to the opening of the guide mounting bottom hole on the third cylinder head 11. Due to the position restriction of the second positioning sleeve 13, it can be ensured that the valve guide 14 is aligned and coaxial with the guide mounting bottom hole on the third cylinder head 11. A pressure rod 15 is provided inside the inner hole of the second positioning sleeve 13. The diameter of the pressure rod 15 is clearance-fitted with the inner diameter of the second positioning sleeve 13. By using a press with adjusted pressure to press down the pressure rod 15, the valve guide 14 can be press-fitted into place.

[0042] The first positioning base plate 1, the second positioning base plate 5, and the third positioning base plate 10 all have the same structure. The first positioning top plate 7 and the second positioning top plate 12 have the same structure. The first positioning sleeve 8 and the second positioning sleeve 13 have the same structure.

[0043] The working principle of this valve guide assembly tool is as follows:

[0044] Step 1: Insert the two locating pins into the two locating pin holes on the locating base plate, with the locating pin diameter Db and the locating pin hole diameter Da in clearance fit.

[0045] Step 2: Install the cylinder head flat-down onto the positioning base plate. The two pin holes on the cylinder head are fitted with the positioning pins with clearance. The two holes are accurately positioned on one side. Use four fixing screws to lock the cylinder head and the positioning base plate. The tilt angle of the positioning base plate can make the cylinder head valve guide mounting hole angle perpendicular to the horizontal plane.

[0046] Step 3: Place the positioning top plate on the top surface of the cylinder head, aligning the positioning hole of the positioning sleeve on the positioning top plate with the guide pipe mounting bottom hole on the cylinder head;

[0047] Step 4: Install the two positioning sleeves into the positioning holes on the positioning top plate, with the outer diameter Df of the positioning sleeve and the positioning hole diameter Dc of the positioning sleeve in clearance fit.

[0048] Step 5: Insert the two positioning rods into the first and eighth guide pipe mounting bottom holes on the cylinder head through the inner holes of the two positioning sleeves respectively. The diameter Dg of the positioning rod is clearance-fitted with the inner diameter De of the positioning sleeve and the diameter of the guide pipe mounting bottom hole on the cylinder head. Through the limiting effect of the positioning rod, the eight positioning holes of the positioning sleeve on the positioning top plate are aligned with the guide pipe mounting bottom holes, and the screw holes on the positioning top plate are aligned with the threaded holes on the cylinder head.

[0049] Step 6: Secure the positioning top plate to the top of the cylinder head using fixing screws;

[0050] Step 7: Remove the two positioning rods. At this point, the eight positioning holes on the positioning top plate are aligned with the eight valve guide bottom holes on the cylinder head.

[0051] Step 8: Place the valve guide into the inner hole of the positioning sleeve. The valve guide will fall freely along the inner hole of the positioning sleeve to the valve guide mounting hole on the cylinder head. Due to the position of the positioning sleeve, it can be ensured that the valve guide is aligned and coaxial with the valve guide mounting hole on the cylinder head.

[0052] Step 9: Place the pressure bar into the positioning sleeve, with the diameter Dh of the pressure bar and the inner diameter De of the positioning sleeve in clearance fit;

[0053] Step 10: Place the entire set of tooling on the press platform;

[0054] Step 11: Use a press with the pressure set to press down the pressure bar to press the valve guide into place. Once in place, the length of the pressure bar Lc and the length of the positioning sleeve La can determine the pressing depth of the valve guide. When the pressing depth needs to be adjusted, the length of the pressure bar Lc or the length of the positioning sleeve La can be changed accordingly.

[0055] Step 12: Move the positioning sleeve and pressure bar to the next hole to complete the assembly of the eight valve guides in sequence.

[0056] 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 valve guide assembly tool characterized by, Include: The first pressing tool is composed of a first positioning base plate (1), a positioning pin (2), a first cylinder cover (3) and a fixing screw (4), and the upper end of the first positioning base plate (1) is provided with a positioning pin hole near the four corners, the positioning pin (2) is inserted into the inside of the positioning pin hole and is matched with the positioning pin hole, and the positioning pin (2) is provided with two, which are diagonally arranged, the lower end of the first cylinder cover (3) is fixedly installed on the upper end of the first positioning base plate (1), and the two pin holes on the first cylinder cover (3) are matched with the two positioning pins (2), the fixing screw (4) is provided with four, the four fixing screws (4) pass through the four pin holes on the first cylinder cover (3) and are connected with the positioning pin holes on the first positioning base plate (1); The second pressing tool is composed of a second positioning base plate (5), a second cylinder cover (6), a first positioning top plate (7), a first positioning sleeve (8) and a positioning rod (9), the second cylinder cover (6) is arranged on the upper end of the second positioning base plate (5), the first positioning top plate (7) is arranged on the upper end of the second cylinder cover (6), and a plurality of fixing screw holes are formed in the upper end of the first positioning top plate (7), a plurality of positioning sleeve positioning holes are formed in the upper end of the first positioning top plate (7), the positioning sleeve positioning holes are arranged in alignment with the pipe installation bottom holes formed in the upper end of the second cylinder cover (6), the first positioning sleeve (8) is arranged in the positioning sleeve positioning holes at both ends, the positioning rod (9) is provided with two, and the two positioning rods (9) pass through the inner holes of the two first positioning sleeves (8) and are inserted into the positioning sleeve positioning holes at both ends of the second cylinder cover (6), the fixing screw holes on the first positioning top plate (7) are arranged in alignment with the threaded holes on the second cylinder cover (6); The third pressing tool is composed of a third positioning base plate (10), a third cylinder cover (11), a second positioning top plate (12), a second positioning sleeve (13), a valve guide pipe (14) and a pressing rod (15), the third cylinder cover (11) is arranged on the upper end of the third positioning base plate (10), the second positioning top plate (12) is arranged on the upper end of the third cylinder cover (11), and a plurality of positioning sleeve positioning holes are formed in the upper end of the second positioning top plate (12), the positioning sleeve positioning holes are arranged in alignment with the pipe installation bottom holes formed in the upper end of the third cylinder cover (11), the second positioning sleeve (13) is arranged in the positioning sleeve positioning holes at both ends, the valve guide pipe (14) is arranged in the inner hole of the second positioning sleeve (13), and the valve guide pipe (14) is freely dropped along the inner hole of the second positioning sleeve (13) to the pipe installation bottom hole orifice formed in the third cylinder cover (11), and the pressing rod (15) is arranged in the inner hole of the second positioning sleeve (13).

2. A valve guide assembly tool as defined in claim 1, wherein: The diameter of the positioning pin (2) is matched with the diameter of the positioning pin hole formed in the first positioning base plate (1).

3. A valve guide installation tool as defined in claim 1, wherein: The pin hole on the first cylinder cover (3) is clearance fit with the positioning pin (2), and the two pin holes and one side of the lower end of the first cylinder cover (3) are accurately positioned, the first positioning bottom plate (1) is arranged in an inclined manner, and the inclination angle thereof can make the angle of the valve guide pipe mounting hole on the first cylinder cover (3) perpendicular to the horizontal plane.

4. A valve guide installation tool according to claim 1, wherein: The outer diameter of the first positioning sleeve (8) is clearance fit with the inner diameter of the positioning sleeve positioning hole on the upper end of the first positioning top plate (7).

5. A valve guide installation tool as defined in claim 1, wherein: The diameter of the positioning rod (9) is clearance fit with the inner diameter of the first positioning sleeve (8) and the inner diameter of the guide pipe mounting bottom hole on the second cylinder cover (6), the positioning rod (9) is limited to make the plurality of positioning sleeve positioning holes on the first positioning top plate (7) aligned with the guide pipe mounting bottom hole on the second cylinder cover (6), and the fixed screw hole on the first positioning top plate (7) is aligned with the threaded hole on the second cylinder cover (6).

6. A valve guide installation tool according to claim 1, wherein: The diameter of the pressing rod (15) is clearance fit with the inner diameter of the second positioning sleeve (13).

7. A valve guide installation tool as defined in claim 1, wherein: The first positioning bottom plate (1), the second positioning bottom plate (5) and the third positioning bottom plate (10) are the same in structure.

8. A valve guide installation tool according to claim 1, wherein: The first positioning top plate (7) and the second positioning top plate (12) are the same in structure, and the first positioning sleeve (8) and the second positioning sleeve (13) are the same in structure.

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