Press fitting assistive device for guide pipe of engine cylinder cover
By designing engine cylinder head conduit pressure assembly auxiliary equipment, and using the coordination of the guide support pipe and the pressing components, the problem of cracking of the bottom hole of the cylinder head conduit during the valve conduit pressing process is solved, achieving a more efficient trial production process and lower production costs.
Patent Information
- Application Number
- CN202421877988.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-05
AI Technical Summary
During the trial production and processing of the engine cylinder head, it is difficult to accurately control the depth of the conduit during the pressing and assembly of the valve conduit, resulting in cracking of the bottom hole of the cylinder head conduit, affecting the trial production efficiency and cost.
An engine cylinder head conduit pressure assembly auxiliary device is designed, including a guide support pipe and a pressing member. The guide support pipe is positioned and cooperated with the valve spring seat on the cylinder head, and the pressing member is used to cooperate with the guide support pipe to ensure the coaxiality of the valve pipe and the bottom hole of the cylinder head conduit, and the pressing depth is controlled through a height adjustment device.
It effectively avoids the cracking of the bottom hole of the cylinder head conduit, improves the pass rate of valve conduit pressure assembly, improves the trial production process and production efficiency, and reduces production costs.
Smart Images
Figure CN222920460U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of press-fitting tools, and more particularly, to an auxiliary tool for press-fitting engine cylinder head ducts. Background Art
[0002] The valve guide is a guiding device for the valves of an automotive engine, which guides the valves and transfers the heat on the valve stem to the cylinder head through the valve guide. Generally, after the inner and outer cylindrical surfaces of the valve guide are processed, they are press-fitted into the valve guide holes (or the bottom holes of the cylinder head ducts) of the cylinder head or the cylinder block, and then the central hole of the valve guide is finely processed to complete the processing of the entire cylinder head. Therefore, how to quickly and accurately press the valve guide into the bottom hole of the cylinder head duct has a great impact on the final quality of the cylinder head.
[0003] Currently, during the trial production and processing of engine cylinder heads, after the bottom holes of the cylinder head ducts are processed, the valve guides need to be press-fitted into the bottom holes of the cylinder head ducts. During the press-fitting process, it is necessary to ensure the accurate press-fitting depth of the ducts to ensure that the cylinder head and the ducts are not damaged before proceeding to the next duct processing. Since traditional press-fitting usually relies on the self-guidance of the ducts, it is difficult to control the press-fitting depth, resulting in the central offset or over-press of the valve guide and the bottom hole of the cylinder head duct during the press-fitting process, generating a large tangential force on the side wall of the bottom hole at the initial stage of press-fitting, causing cracking, thus overall reducing the qualified rate of valve guide press-fitting, affecting the trial production efficiency, damaging the cylinder head samples, and increasing the production cost during the trial production stage. Summary of the Utility Model
[0004] The purpose of the present application is to provide an auxiliary tool for press-fitting engine cylinder head ducts, which overcomes the technical problem of cracking of the bottom holes of the cylinder head ducts caused during the press-fitting process of the valve guides. The specific solution is as follows:
[0005] An auxiliary tool for press-fitting engine cylinder head ducts includes: a guiding and supporting tube with its bottom positioned and fitted with the valve spring seat on the cylinder head; wherein, a positioning chamber for accommodating the valve guide is provided through the middle of the guiding and supporting tube; it further includes: a press-fitting component cooperating with the guiding and supporting tube; the bottom of the press-fitting component can be inserted into the positioning chamber to push the valve guide in the positioning chamber into the bottom hole of the cylinder head duct; a height adjusting device for adjusting the press-fitting depth of the valve guide into the bottom hole of the cylinder head duct is also provided on the press-fitting component.
[0006] Preferably, the press-fitting component includes: a threaded rod and a first top block provided at the top of the threaded rod; the bottom of the threaded rod can be inserted into the positioning chamber of the guiding and supporting tube and contact the valve guide inside the positioning chamber; the threaded rod and the guiding and supporting tube are in clearance fit, and the clearance is 0.01 - 0.02 mm, preferably 0.01 mm.
[0007] Preferably, height marking lines are provided on the outer part of the threaded rod; the height marking lines are used to indicate the installation position of the height adjusting device on the threaded rod.
[0008] Preferably, the height adjusting device includes: a height limiting block threadedly connected to the threaded rod and a locking and positioning block arranged at the upper end of the height limiting block and threadedly connected to the threaded rod; wherein, the locking and positioning block is used to lock and fix the height limiting block on the threaded rod.
[0009] Preferably, a buffer device is further provided on the top of the first top block; the buffer device includes: an upper top block and a flexible buffer member arranged at the bottom of the upper top block; wherein, the upper end and the lower end of the flexible buffer member are respectively adhesively fixed to the upper top block and the first top block.
[0010] Preferably, the flexible buffer member is made of nylon rubber material.
[0011] Preferably, an annular boss is provided at the bottom of the guiding and supporting tube; the guiding and supporting tube is inserted and matched with a valve spring seat on the cylinder head through the annular boss provided at the bottom; wherein, a cylinder head duct bottom hole which is in interference fit with a valve duct is provided in the middle of the valve spring seat.
[0012] Preferably, a conical guiding part for installing and positioning in cooperation with the cylinder head duct bottom hole is provided on the outer periphery at the bottom of the valve duct.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] An auxiliary tool for press-fitting an engine cylinder head duct provided by the present utility model, through the guiding and supporting tube which is positioned and matched with the valve spring seat on the cylinder head, and by using a press-fitting component to cooperate with the guiding and supporting tube to press-fit the valve duct, and in combination with a height adjusting device, it ensures that during the press-fitting process, the coaxiality between the valve duct and the cylinder head duct bottom hole and the press-fitting depth of the valve duct can be accurately controlled, thereby avoiding the situation of cracking of the cylinder head duct bottom hole. Description of the Drawings
[0015] Figure 1 is a schematic diagram of the overall structure of the auxiliary tool for press-fitting an engine cylinder head duct;
[0016] Figure 2 is Figure 1 the A-A sectional view of
[0017] Figure 3 is a connection diagram of the valve duct and the cylinder head duct bottom hole at the center of the valve spring seat.
[0018] In the figure:
[0019] 1. Cylinder head;
[0020] 2. Valve spring seat;
[0021] 3. Guide support tube; 31. Positioning chamber; 32. Annular boss;
[0022] 4. Valve guide;
[0023] 5. Press-fitting component; 51. Threaded rod; 52. First top block; 53. Height marking line;
[0024] 6. Height adjustment device; 61. Height limit block; 62. Locking and positioning block;
[0025] 7. Buffer device; 71. Upper top block; 72. Flexible buffer;
[0026] 8. Bottom hole of cylinder head duct;
[0027] 9. Conical guiding part. Detailed implementation mode
[0028] In order to make the purpose, technical solution and advantages of the present application clearer, the following will be combined with the attached Figures 1-3 The present application will be further described in detail. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0029] It should be understood that although terms such as first, second, and third may be used in the embodiments of the present application for description, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first can also be called the second, and similarly, the second can also be called the first.
[0030] The present application provides an auxiliary tool for press-fitting a cylinder head duct of an engine, including: a guide support tube 3 whose bottom is positioned and fitted with a valve spring seat 2 on the cylinder head 1; wherein, a positioning chamber 31 for accommodating a valve guide 4 is penetrated through the middle of the guide support tube 3; further including: a press-fitting component 5 cooperating with the guide support tube 3; the bottom of the press-fitting component 5 can be inserted into the positioning chamber 31 for pushing the valve guide 4 in the positioning chamber 31 into the bottom hole 8 of the cylinder head duct; a height adjustment device 6 for adjusting the pressing depth of the valve guide 4 into the bottom hole 8 of the cylinder head duct is further arranged on the press-fitting component 5.
[0031] It can be understood that in this application, by ensuring the accurate press-fitting depth of the valve guide 4, it is ensured that there is no damage to the cylinder head 1 during the installation process of the valve guide 4. Among them, the depth tolerance range of the valve guide 4 is ±0.3 mm. At the same time, in this application, through the cooperation of the guiding support tube 3 and the press-fitting component 5, the coaxiality of the press-fitting of the valve guide 4 and the bottom hole 8 of the cylinder head guide tube is ensured. Thus, overall, the situation of cracking at the upper edge of the bottom hole 8 of the cylinder head guide tube during the press-fitting process is avoided.
[0032] Optionally, the press-fitting component 5 includes: a threaded rod 51 and a first top block 52 arranged at the top of the threaded rod 51. The bottom of the threaded rod 51 can be inserted into the positioning chamber 31 of the guiding support tube 3 and contact the valve guide 4 inside the positioning chamber 31, so as to press-fit the valve guide 4 into the bottom hole 8 of the cylinder head guide tube. The valve guide 4, the threaded rod 51, and the guiding support tube 3 are all in clearance fit. The advantage of this design is that it can ensure that the coaxiality between the valve guide 4 and the bottom hole 8 of the cylinder head guide tube is about 0.1 mm during the press-fitting process, and avoid the cracking phenomenon caused by the large tangential force generated on the bottom hole 8 of the cylinder head guide tube due to offset or deformation of the valve guide 4 during the press-fitting process.
[0033] Optionally, a height marking line 53 for indicating the installation position of the height adjustment device 6 on the threaded rod 51 is arranged on the outside of the threaded rod 51. It can be understood that through the height marking line 53, the press-fitting depth of the valve guide 4 in the bottom hole 8 of the cylinder head guide tube can be ensured, so as to ensure that the press-fitting tolerance of the valve guide 4 meets the design requirements, avoid the cylinder head being damaged due to excessive force on the valve guide 4 squeezing the bottom hole 8 of the cylinder head guide tube, and avoid the situation where the press-fitting is not in place due to too little force on the valve guide 4.
[0034] Among them, the height adjustment device 6 includes: a height limit block 61 threadedly connected to the threaded rod 51 and a locking and positioning block 62 arranged at the upper end of the height limit block 61 and threadedly connected to the threaded rod 51. Among them, the locking and positioning block 62 is used to lock and fix the height limit block 61 on the threaded rod 51.
[0035] It can be understood that during use, by screwing the height limit block 61 to align with the height marking line 53, the press-fitting depth of the valve guide 4 is adjusted. In order to avoid the position of the height limit block 61 changing during the press-fitting process, the locking and positioning block 62 is tightened to make it press tightly against the height limit block 61, so as to realize the locking and fixing of the height limit block 61.
[0036] Optionally, a buffer device 7 is further arranged at the top of the first top block 52. The buffer device 7 includes: an upper top block 71 and a flexible buffer member 72 arranged at the bottom of the upper top block 71. Among them, the upper end and the lower end of the flexible buffer member 72 are respectively adhesively fixed to the upper top block 71 and the first top block 52. The flexible buffer member 72 is made of nylon rubber material.
[0037] Specifically, through the arrangement of the buffer device 7, it is avoided that during the press-fitting process of the valve guide 4, the force on the valve guide 4 increases sharply, resulting in deformation of the valve guide 4. It can be understood that by using the flexible buffer member 72 made of nylon rubber, the pressure change conducted by the press to the press-fitting component 5 can be absorbed and released, thereby reducing the magnitude change of the pressure received by the valve guide 4, making the force during the process of pressing the guide not change sharply and the force being more uniform.
[0038] Optionally, an annular boss 32 is provided at the bottom of the guiding and supporting tube 3; the guiding and supporting tube 3 is inserted and fitted with the valve spring seat 2 on the cylinder head through the annular boss 32 provided at the bottom; wherein, a cylinder head guide hole bottom hole 8 that is in interference fit with the valve guide 4 is provided in the middle of the valve spring seat 2. It can be understood that by the insertion and fitting of the guiding and supporting tube 3 and the valve spring seat 2, the coaxiality of the guiding and supporting tube 3 and the cylinder head guide hole bottom hole 8 can be ensured, thereby ensuring the coaxiality of the valve guide 4 and the cylinder head guide hole bottom hole 8 when the valve guide 4 is installed, and avoiding a large tangential force being generated on the upper end of the cylinder head guide hole bottom hole 8 by the valve guide 4 during the press-fitting process, resulting in a cracking phenomenon.
[0039] It should be noted that the valve spring seat 2 is correspondingly located at the upper end of the cylinder head guide hole bottom hole 8 on the cylinder head and serves as the side wall of the upper end of the cylinder head guide hole bottom hole. Since the side wall of the valve spring seat is relatively thin, during the press-fitting process, due to the extrusion caused by offset and deformation, it is extremely easy to cause cracking at the upper end of the cylinder head guide hole bottom hole 8, which greatly affects the production efficiency of the trial-produced cylinder head and increases the cost.
[0040] Based on the above content, in this application, the guiding and supporting tube 3 is installed and positioned with the valve spring seat on the cylinder head, and then the press-fitting component 5 is used in cooperation with the guiding and supporting tube 3 to ensure the coaxiality of the valve guide 4 and the cylinder head guide hole bottom hole 8 when the valve guide 4 is press-fitted, reducing the tangential force. At the same time, through the height adjustment device 6, it is ensured that the valve guide 4 meets the depth tolerance design during the press-fitting process, avoiding overpressure causing deformation of the valve guide 4, increasing the tangential force on the side wall of the cylinder head guide hole bottom hole 8 and causing cracking of the cylinder head guide hole bottom hole 8, and being too small resulting in the valve guide 4 not being press-fitted in place, affecting the use function.
[0041] Furthermore, a conical guiding portion 9 for installing and positioning in cooperation with the cylinder head guide hole bottom hole 8 is provided on the outer periphery of the bottom of the valve guide 4.
[0042] It can be understood that the conical guiding portion 9, as a guiding and positioning functional component of the valve guide 4, has a front-end diameter smaller than the diameter of the bottom hole 8 of the cylinder head guide. Therefore, during installation, the conical guiding portion can first enter a part of the bottom hole 8 of the cylinder head guide, playing a role of positioning and guiding, further ensuring the coaxiality between the valve guide 4 and the bottom hole 8 of the cylinder head guide, guaranteeing the accuracy and efficiency of press-fitting, and avoiding the cracking of the bottom hole 8 of the cylinder head guide.
[0043] Furthermore, the height of the conical guiding portion 9 is 3 mm. Among them, a reverse chamfer is provided at the edge of the end of the valve guide 4 away from the conical guiding portion 9; the height of the chamfer is 0.4 mm. The advantage of this design is that by inserting the threaded rod 51 of the press-fitting component 5 into the positioning chamber and reading the height marking line 53 on the threaded rod, the correct installation direction of the valve guide 4 can be determined by reading the insertion depth of the threaded rod 51 in the natural state, avoiding the situation that the valve guide 4 is installed reversely inside the positioning chamber 31.
[0044] It can be understood that based on the provided press-fitting auxiliary tool for the engine cylinder head guide, compared with the traditional press-fitting in the prior art that usually relies on the self-guidance of the guide, the press-fitting depth is difficult to control, and the center of the valve guide 4 and the bottom hole 8 of the cylinder head guide is offset during the press-fitting process, resulting in a large tangential force on the side wall of the bottom hole at the initial stage of press-fitting and causing cracking. The success rate of avoiding cracking of the bottom hole 8 of the cylinder head guide in this application has been increased from the original 50% to 100%, improving the trial production process and production efficiency of the engine cylinder head, and having high on-site practicability.
[0045] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.
Claims
1. An engine cylinder head conduit press-fitting aid, characterized in that: include: A guide support tube (3) whose bottom is positioned and matched with a valve spring seat (2) on a cylinder head (1); wherein a positioning chamber (31) capable of accommodating a valve guide tube (4) is provided through the middle of the guide support tube (3); and further comprising: a press-fitting component (5) matched with the guide support tube (3); the bottom of the press-fitting component (5) can be inserted into the positioning chamber (31) to push the valve guide tube (4) in the positioning chamber (31) into the bottom hole (8) of the cylinder head guide tube; and the press-fitting component (5) is also provided with a height adjustment device (6) for adjusting the pressing depth of the valve guide tube (4) into the bottom hole (8) of the cylinder head guide tube.
2. The engine cylinder head conduit press-fitting aid according to claim 1, characterized in that: The press-fit component (5) comprises: a threaded rod (51) and a first top block (52) arranged at the top of the threaded rod (51); the bottom of the threaded rod (51) can be inserted into the positioning chamber (31) of the guide support tube (3) and contact the valve guide (4) inside the positioning chamber (31); the threaded rod (51) and the guide support tube (3) are clearance-matched.
3. The engine cylinder head conduit press-fitting aid according to claim 2, characterized in that: A height marking line (53) is arranged outside the threaded rod (51); the height marking line is used to indicate the installation position of the height adjustment device (6) on the threaded rod (51).
4. The engine cylinder head conduit press-fitting aid according to claim 3, characterized in that: The height adjustment device (6) comprises: a height limiting block (61) threadedly connected to the threaded rod (51) and a locking positioning block (62) arranged at the upper end of the height limiting block (61) and threadedly connected to the threaded rod (51); wherein the locking positioning block (62) is used to lock and fix the height limiting block (61) on the threaded rod (51).
5. The engine cylinder head conduit press-fitting aid according to claim 4, characterized in that: A buffer device (7) is also provided on the top of the first top block (52); the buffer device (7) comprises: an upper top block (71) and a flexible buffer component (72) provided at the bottom of the upper top block (71); wherein the upper end and the lower end of the flexible buffer component (72) are respectively glued and fixed to the upper top block (71) and the first top block (52).
6. The engine cylinder head conduit press-fitting aid according to claim 5, characterized in that: The flexible buffer (72) is made of nylon rubber.
7. The engine cylinder head conduit press-fitting aid according to claim 6, characterized in that: An annular boss (32) is arranged at the bottom of the guide support tube (3); the guide support tube (3) is plug-fitted with the valve spring seat (2) on the cylinder head (1) via the annular boss (32) arranged at the bottom; wherein a cylinder head guide bottom hole (8) which is interference-fitted with the valve guide (4) is arranged in the middle of the valve spring seat (2).
8. The engine cylinder head conduit press-fitting aid according to claim 7, characterized in that: The outer periphery of the bottom of the valve guide (4) is provided with a tapered guide portion (9) which is installed and positioned in cooperation with the cylinder head guide bottom hole (8).