Engine valve seat ring press-in tool

Abstract

The utility model relates to the technical field of engine installation tools, in particular to an engine valve seat ring press-in tool which comprises a pressing seat, a pressing block and a thrust assembly. A supporting table is arranged at the end of the pressing base, and an inner concave hole is formed in the end face of the supporting table. The pressing block is installed at the end of the pressing base, a plurality of thrust holes are formed in the circumferential direction of the pressing block, the thrust holes are blind holes and are evenly formed in the radial direction of the pressing block, and a thrust assembly is installed in each thrust hole; the thrust assembly comprises an elastic piece and a ball, the elastic piece is installed in the thrust hole, the radial inner end of the ball abuts against the elastic piece, the radial outer end of the ball abuts against the inner concave hole of the pressing base, and the diameter of the outer contour of the ball is larger than that of the supporting table. By means of the press-in tool, gaps between the valve seat ring and the press-in tool are evenly distributed, and the press-fitting precision of the valve seat ring and the overall performance of an engine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine installation tools, in particular to an engine valve seat ring pressing tooling. Background Art

[0002] In the field of engine manufacturing, the precise installation of the valve seat ring is crucial for ensuring the engine performance. The valve seat ring is a sealing component installed on the engine cylinder head, and its main function is to seal the valve and withstand high-speed impacts. The valve seat ring is required to be pressed into the seat ring hole in the correct posture, and the valve seat ring and the seat ring hole are completely fitted without gaps. Generally, the engine valve seat ring is automatically pressed in by an automated device. During the pressing process, the static accuracy of the device, especially the coaxiality between the valve seat ring and the bottom hole of the valve seat ring during the pressing process, has a great influence on the pressing accuracy of the valve seat ring.

[0003] The existing valve seat ring pressing tooling structure includes a guide shaft, a valve seat ring, a cylinder head, and a cylinder head guide hole. Before pressing the valve seat ring, the valve seat ring is sleeved on the guide shaft in advance, and the guide shaft is inserted into the guide hole as a guide. Under the action of an external force, the valve seat ring is pressed into the seat ring hole by the guide shaft.

[0004] In order to ensure that the guide shaft can be smoothly pulled out after the valve seat ring is pressed in, there is a gap of about (0.1 - 0.2) mm in the diameter direction between the valve seat ring and the guide shaft. Due to the gap between the valve seat ring and the guide shaft, during the pressing process, the valve seat ring will shift relative to the guide shaft. After the shift, the valve seat ring will scratch the seat ring hole, and the iron filings scraped off will fall between the valve seat ring and the seat ring hole, resulting in the valve seat ring not being able to fit completely with the hole. This will lead to quality problems such as poor heat conduction of the seat ring, abnormal wear and breakage of the engine seat ring. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the embodiment of the utility model is to provide an engine valve seat ring pressing tooling, which realizes the uniform distribution of the gap between the valve seat ring and the pressing tooling based on the three-point centering principle, thereby ensuring the coaxiality between the valve seat ring and the bottom hole of the valve seat ring, solving the problems existing in the existing technology, and improving the pressing accuracy of the valve seat ring.

[0006] To achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] An engine valve seat pressing tooling, comprising: a pressing seat, a pressing block and a thrust assembly; a supporting platform is arranged at the end of the pressing seat, and a concave hole is arranged on the end face of the supporting platform; the pressing block is installed at the end of the pressing seat, and a plurality of thrust holes are arranged along the circumferential direction of the pressing block. The thrust holes are blind holes and are uniformly arranged along the radial direction of the pressing block. A set of thrust assemblies are installed in each thrust hole; the thrust assembly includes an elastic member and a ball. The elastic member is installed in the thrust hole. The radially inner end of the ball abuts against the elastic member, and the radially outer end abuts against the concave hole of the pressing seat. And the outer contour diameter of the ball is larger than the diameter of the supporting platform.

[0008] Optionally, the cross-section of the concave hole is a concave arc surface. The outer diameter of the pressing block is smaller than the diameter of the supporting platform. The contact surface between the pressing block and the pressing seat and the edge of the outer circle are rounded corners.

[0009] Optionally, a positioning hole is arranged at the center of the pressing seat. The positioning hole is axially inside the concave hole and is coaxially arranged with the concave hole. A positioning platform is arranged at the end of the pressing block, and the positioning platform is installed in the positioning hole.

[0010] Optionally, the pressing block is detachably connected to the pressing seat.

[0011] Optionally, a threaded hole is arranged at the bottom of the positioning hole of the pressing seat, and a bolt hole is arranged on the pressing block. The positions of the bolt hole and the threaded hole match.

[0012] Optionally, a positioning surface is arranged at the axially rear end of the supporting platform. The positioning surface is perpendicular to the axis of the supporting platform for pressing the valve seat.

[0013] Optionally, an inclined angle is arranged at the junction of the supporting platform and the positioning surface of the pressing seat.

[0014] Optionally, a clamping groove is arranged on the outer contour surface of the circumferential direction of the pressing seat. The clamping groove is an open groove and is uniformly arranged along the circumferential direction of the pressing seat.

[0015] Optionally, at least three thrust holes are arranged on the pressing block, and the number of the thrust assemblies is equal to the number of the thrust holes.

[0016] Optionally, the elastic member is a thrust spring and the ball is a steel ball.

[0017] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0018] The press-fitting tooling includes a press base, a press block, and a thrust assembly. A support platform is provided at the end of the press base, and the support platform is used to support the valve seat ring. A concave hole is provided on the end face of the support platform. The press block is circumferentially provided with a plurality of thrust holes, and a set of thrust assemblies are installed in each thrust hole. The elastic member is installed in the thrust hole. The inner end of the ball abuts against the elastic member and the outer end abuts against the concave hole of the press base. Through the cooperation of the concave hole and the thrust hole, the elastic member and the ball can be fixed in the press-fitting tooling without falling out. Moreover, the outer contour diameter of the ball is larger than the diameter of the support platform. Through a plurality of evenly arranged elastic thrust assemblies, the clearance between the valve seat ring and the press-fitting tooling is evenly distributed, eliminating the seat ring positioning error caused by the clearance between the valve seat ring and the press-fitting tooling, thereby effectively improving the press-fitting accuracy of the valve seat ring.

[0019] Advantages of additional aspects of the present utility model will be given in the following description, some of which will become apparent from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The schematic drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1 is a cross-sectional view of the press-fitting tooling provided by an embodiment of the present utility model;

[0022] Figure 2 is a side view of the press-fitting tooling provided by an embodiment of the present utility model;

[0023] Figure 3 is a cross-sectional view of the press base provided by an embodiment of the present utility model;

[0024] Figure 4 is a side view of the press base provided by an embodiment of the present utility model;

[0025] Figure 5 is a cross-sectional view of the press block provided by an embodiment of the present utility model;

[0026] Figure 6 is a side view of the press block provided by an embodiment of the present utility model;

[0027] Figure 7 is a schematic diagram of the valve seat ring installed on the press-fitting tooling provided by an embodiment of the present utility model;

[0028] In the figure: 1. Pressing seat; 11. Positioning surface; 12. Support platform; 13. Positioning hole; 14. Concave hole; 15. Chamfer; 16. Card slot; 17. Threaded hole; 2. Pressing block; 21. Outer circle; 22. Rounding; 23. Positioning platform; 24. Thrust hole; 25. Bolt hole; 3. Thrust assembly; 31. Elastic member; 32. Ball; 4. Valve seat ring

[0029] The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration purpose. Detailed implementation manners

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] As introduced in the background art, the valve seat ring pressing tooling in the prior art generally includes a guiding shaft, a valve seat ring, a cylinder head and a guide hole. The valve seat ring is placed on the guiding shaft before pressing. The guiding shaft is inserted into the guide hole for guiding. Under the action of external force, the valve seat ring is pressed into the seat ring hole. Since the gap between the valve seat ring and the guiding shaft may cause the valve seat ring to shift during the pressing process, resulting in the valve seat ring scratching the seat ring hole, iron filings falling into the hole, affecting the fit between the valve seat ring and the hole, and leading to quality problems such as poor heat conduction, abnormal wear and even breakage. To solve the above technical problems, the present utility model proposes an engine valve seat ring pressing tooling, which realizes uniform distribution of the gap between the valve seat ring pressing tooling and the valve seat ring based on the three-point centering principle, thereby ensuring the coaxiality between the valve seat ring and the bottom hole of the valve seat ring, ensuring correct pressing of the valve seat ring, and ensuring the pressing quality.

[0032] As Figure 1 、 Figure 2 shown, the engine valve seat ring pressing tooling includes a pressing seat 1, a pressing block 2 and a thrust assembly 3. As Figure 3 、 Figure 4 shown, a support platform 12 is provided at the end of the pressing seat 1. The support platform 12 is a frustum of a cone, and a concave hole 14 is provided on the end face of the support platform 12. The pressing block 2 is installed at the end of the pressing seat 1. As Figure 5 、 Figure 6 shown, a plurality of thrust holes 24 are provided along the circumferential direction of the pressing block 2. The thrust holes 24 are blind holes and are uniformly arranged along the radial direction of the pressing block 2. A set of thrust assemblies 3 is installed in each thrust hole 24. As Figure 2As shown, the thrust assembly 3 includes an elastic member 31 (i.e., a spring) and a ball 32 (i.e., a steel ball). The elastic member 31 is installed in the thrust hole 24. The radially inner end of the ball 32 abuts against the elastic member 31, and the radially outer end abuts against the concave hole 14 of the pressing seat 1. Moreover, the outer contour diameter of the ball 32 is larger than the diameter of the support platform 12. The pressing seat 1 is used to connect the automatic pressing equipment and is also the part that directly contacts the valve seat ring 4 during pressing. Under the movement of the pressing seat 1, the valve seat ring 4 is pressed into the seat ring hole. The pressing block 2 is used to install the spring and the steel ball, and there are a total of 3 holes for installing the spring and the steel ball.

[0033] This pressing tool includes a pressing seat 1, a pressing block 2, and a thrust assembly 3. The end of the pressing seat 1 is provided with a support platform 12, and the support platform 12 is used to support the valve seat ring 4. The end face of the support platform 12 is provided with a concave hole 14. The pressing block 2 is circumferentially provided with a plurality of thrust holes 24, and a set of thrust assemblies 3 are installed in each thrust hole 24. The elastic member 31 is installed in the thrust hole 24. The inner end of the ball 32 abuts against the elastic member 31 and the outer end abuts against the concave hole 14 of the pressing seat 1. Through the cooperation of the concave hole 14 and the thrust hole 24, it is realized that the elastic member 31 and the ball 32 can be fixed in the pressing tool without coming out. Moreover, the outer contour diameter of the ball 32 is larger than the diameter of the support platform 12. Through multiple groups of uniformly arranged elastic thrust assemblies 3, the gap between the valve seat ring 4 and the pressing tool is evenly distributed, eliminating the seat ring positioning error caused by the gap between the valve seat ring 4 and the pressing tool, thereby effectively improving the pressing accuracy of the valve seat ring 4. On the other hand, when there is a slight positioning error between the valve seat ring 4 and the seat ring hole, the positioning adjustment of the seat ring can also be realized under the cooperation of the seat ring guiding angle and the elastic member 31 to ensure smooth pressing.

[0034] The cross-section of the concave hole 14 is a concave arc surface. The outer diameter 21 of the pressing block 2 is smaller than the diameter of the support platform 12. The contact surface between the pressing block 2 and the pressing seat 1 and the edge of the outer circle 21 are rounded corners 22.

[0035] As Figure 3 shown, the cross-section of the concave hole 14 is designed as a concave arc surface, which helps to abut against the ball 32, better adapt to the shape of the ball 32, and reduce the contact stress. The outer diameter 21 of the pressing block 2 is smaller than the diameter of the support platform 12. The contact surface between the pressing block 2 and the pressing seat 1 and the edge of the outer circle 21 are designed as rounded corners 22 to match the concave hole 14 and prevent installation interference.

[0036] A positioning hole 13 is provided at the center of the pressing seat 1. The positioning hole 13 is located axially inside the concave hole 14, and the positioning hole 13 and the concave hole 14 are coaxially arranged. A positioning platform 23 is provided at the end of the pressing block 2, and the positioning platform 23 is installed in the positioning hole 13. This design makes the position of the pressing block 2 on the pressing seat 1 more accurate, ensuring accurate positioning of the valve seat ring 4 during the pressing process and avoiding pressing quality problems caused by positioning errors.

[0037] The pressing block 2 is detachably connected to the pressing seat 1. This connection method can be a threaded connection, a snap connection or other mechanical connection methods. The detachable design is convenient for maintenance and replacement, improving the flexibility and service life of the tooling.

[0038] In this embodiment, a bolt connection is adopted. A threaded hole 17 is provided at the bottom of the positioning hole 13 of the pressing seat 1, and a bolt hole 25 is provided on the pressing block 2. The positions of the bolt hole 25 and the threaded hole 17 match. The connection between the pressing block 2 and the pressing seat 1 is realized through bolts and threads. This threaded connection method is not only firm but also convenient for disassembly and adjustment to meet different pressing requirements.

[0039] As Figure 3 shown, a positioning surface 11 is provided at the axial rear end of the support platform 12. The positioning surface 11 is perpendicular to the axis of the support platform 12 and is used for pressing the valve seat ring 4. The axial positioning of the valve seat ring 4 is restricted through the positioning surface 11, enabling the valve seat ring 4 to be smoothly pressed into the seat ring hole.

[0040] As Figure 3 shown, a chamfer 15 is provided at the junction of the support platform 12 and the positioning surface 11 of the pressing seat 1. The setting of the chamfer 15 increases the strength of the pressing seat 1, reduces stress concentration and does not interfere with the installation of the valve seat ring 4 at the same time.

[0041] A clamping groove 16 is provided on the outer circumferential surface of the pressing seat 1 in the circumferential direction. The clamping groove 16 is an open groove and is evenly arranged along the circumferential direction of the pressing seat 1. It is convenient to rotate the pressing seat 1 through the clamping groove 16 and then install it on the automated equipment.

[0042] As Figure 2 shown, at least three thrust holes 24 are provided on the pressing block 2, and the number of the thrust components 3 is equal to the number of the thrust holes 24, so that the valve seat ring 4 is evenly stressed during the pressing process, avoiding pressing quality problems caused by uneven stress.

[0043] The elastic member 31 is a thrust spring, and the ball 32 is a steel ball. The combination of the thrust spring and the steel ball not only provides the necessary elasticity and support, but also provides a stable radial force during the pressing process, ensuring the coaxiality between the valve seat ring 4 and the pressing-in tooling and improving the accuracy and reliability of the pressing.

[0044] The spring is used to ensure that the steel balls always remain in the maximum extended position without external force. The three springs need to be manufactured in the same batch, and the elastic coefficients of the springs are consistent, so as to ensure uniform three-point force on the valve seat ring 4. In addition, the machining accuracy of the pressure seat 1 and the pressure block 2 needs to meet high tolerance requirements, so as to ensure the reasonable fixed position of the steel balls, and the valve seat ring 4 has forces in both the axial and radial directions at the same time.

[0045] Press-fitting process:

[0046] As Figure 7 shown, under the operation of manual or automated mechanical devices, pressure is applied to the valve seat ring 4 from the side of the pressure block 2. Under the conical surface pressure of the valve seat ring 4, the steel balls and the spring are compressed, and the valve seat ring 4 is pre-installed onto the valve seat ring press-fitting tooling. After the valve seat ring 4 is pre-installed in place, it fits perfectly with the positioning surface 11 of the pressure seat 1, the spring elongates, and at the same time, under the action of the same radial force of the three steel balls, the valve seat ring 4 and the pressure seat 1 remain coaxial. At the same time, the steel balls will apply axial pressure to the valve seat ring 4, and the valve seat ring 4 will not fall off from the pressure seat 1.

[0047] Under the same acting force of the three steel balls, the gap between the valve seat ring 4 and the press-fitting tooling is eliminated, and the coaxiality error between the valve seat ring 4 and the seat ring hole is converted into the coaxiality error between the valve seat ring press-fitting tooling and the seat ring hole. By adjusting the relative positions of the connection part of the pressure seat 1 of the automatic press-fitting equipment and the cylinder head, the coaxiality error between the valve seat ring 4 and the seat ring hole can be reduced, so as to ensure the press-fitting accuracy.

[0048] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. An engine valve seat ring press-in tool, characterized in that: include: A pressure seat (1), a pressure block (2) and a thrust assembly (3); A support platform (12) is provided at the end of the pressure seat (1), and an inner concave hole (14) is provided on the end surface of the support platform (12); The pressing block (2) is installed at the end of the pressing seat (1), and a plurality of thrust holes (24) are arranged along the circumference of the pressing block (2). The thrust holes (24) are blind holes and are evenly arranged along the radial direction of the pressing block (2). A set of thrust components (3) is installed in each thrust hole (24); The thrust assembly (3) comprises an elastic member (31) and a ball (32), wherein the elastic member (31) is installed in the thrust hole (24), the radial inner end of the ball (32) abuts against the elastic member (31), and the radial outer end abuts against the inner recessed hole (14) of the pressure seat (1), and the outer contour diameter of the ball (32) is greater than the diameter of the support platform (12).

2. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: The cross section of the inner concave hole (14) is an inner concave arc surface, the diameter of the outer circle (21) of the pressing block (2) is smaller than the diameter of the support platform (12), and the corners of the abutting surface between the pressing block (2) and the pressing seat (1) and the outer circle (21) are rounded corners (22).

3. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: A positioning hole (13) is provided at the center of the pressure seat (1), the positioning hole (13) is located axially inside the inner recessed hole (14), and the positioning hole (13) and the inner recessed hole (14) are coaxially arranged, and a positioning platform (23) is provided at the end of the pressure block (2), and the positioning platform (23) is installed in the positioning hole (13).

4. The engine valve seat ring pressing tool as claimed in claim 3, characterized in that: The pressing block (2) is detachably connected to the pressing seat (1).

5. The engine valve seat ring pressing tool as claimed in claim 4, characterized in that: A threaded hole (17) is provided at the bottom of the positioning hole (13) of the pressure seat (1), and a bolt hole (25) is provided on the pressure block (2), and the positions of the bolt hole (25) and the threaded hole (17) match.

6. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: The axial rear end of the support platform (12) is provided with a positioning surface (11), and the positioning surface (11) is perpendicular to the axis of the support platform (12) and is used for pressing the valve seat ring (4).

7. The engine valve seat ring pressing tool as claimed in claim 6, characterized in that: An oblique angle (15) is provided at the intersection of the support platform (12) and the positioning surface (11) of the pressure seat (1).

8. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: A clamping groove (16) is provided on the outer contour surface of the pressure seat (1) in the circumferential direction. The clamping groove (16) is an open groove and is evenly arranged along the circumference of the pressure seat (1).

9. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: The pressing block (2) is provided with at least three thrust holes (24), and the number of the thrust assemblies (3) is equal to the number of the thrust holes (24).

10. The engine valve seat ring pressing tool as claimed in claim 1, characterized in that: The elastic member (31) is a thrust spring, and the ball (32) is a steel ball.

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