Valve seat press fitting tool

Abstract

The utility model discloses a valve seat press fitting tool which comprises a first pressing block and a second pressing block, the lower portion of the first pressing block is provided with a first contact face used for making face contact with the upper end face of a valve seat and a second contact face used for making face contact with the upper end face of an air cylinder cover, and the first contact face is perpendicular to the press fitting direction of the valve seat. The first contact surface is parallel to the second contact surface; a third contact face in face contact with the upper end face of the valve seat is arranged on the lower portion of the second pressing block, and the outer contour size of the second pressing block is matched with the size of the upper end face of the valve seat. According to the utility model, when the first pressing block is pressed downwards, the first pressing block can only move downwards in the direction with the gap, that is, when the second contact surface is flush with the upper end surface of the cylinder cover, only the perpendicularity error influence of the valve seat hole and the upper end surface of the cylinder cover exists, so that the deviation can be well corrected after the valve seat is guided in; and therefore, the valve seat is directly pressed in place through the second pressing block, and the valve seat is prevented from being sheared in the installation process.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve seat installation, and particularly relates to a valve seat press-fitting tooling. Background Art

[0002] When installing a valve seat on a cylinder head, since the fitting mode between the valve seat and the valve seat hole on the cylinder head is an interference fit, cold installation or press-fitting is often used, but shear conditions are likely to occur in both cases. And for some valve seats with special structures, this situation is particularly serious. For example, in the case where there is a sealing requirement for the valve seat, the shear occurring during the valve seat installation process will cause leakage, making it difficult for the valve seat to meet the sealing requirement. Summary of the Utility Model

[0003] The utility model provides a valve seat press-fitting tooling to overcome the defects of the prior art, which can avoid shear of the valve seat during the installation process.

[0004] The purpose of the utility model is realized by the following technical solutions:

[0005] A valve seat press-fitting tooling, which comprises:

[0006] A first pressing block, the lower part of the first pressing block is provided with a first contact surface for surface contact with the upper end surface of the valve seat and a second contact surface for surface contact with the upper end surface of the cylinder head. The second contact surface is located above the first contact surface. The first contact surface is perpendicular to the press-fitting direction of the valve seat, the first contact surface is parallel to the second contact surface, and the outer contour dimension of the first contact surface matches the outer contour dimension of the valve seat. Wherein, when the first contact surface contacts the upper end surface of the valve seat, there is a gap in the vertical direction between the second contact surface and the upper end surface of the cylinder head;

[0007] A second pressing block, the lower part of the second pressing block is provided with a third contact surface for surface contact with the upper end surface of the valve seat, and the outer contour dimension of the second pressing block matches the dimension of the upper end surface of the valve seat.

[0008] The beneficial effect of adopting the above technical solution is that before pressing down the first pressing block, the first contact surface contacts the upper end surface of the valve seat, and there is a gap in the vertical direction between the second contact surface and the upper end surface of the cylinder head. When pressing down the first pressing block, the first pressing block can only move downward in the direction with the gap, that is, when the second contact surface is flush with the upper end surface of the cylinder head, only the perpendicularity error between the valve seat hole and the upper end surface of the cylinder head affects, so that good deviation correction can be carried out after the valve seat is introduced, and then the valve seat can be directly pressed in place by using the second pressing block, thereby avoiding shear of the valve seat during the installation process.

[0009] In one embodiment, the outer contour diameter of the second contact surface is 1.2 - 1.5 times the outer contour diameter of the valve seat.

[0010] The beneficial effects of adopting the above technical solution are as follows: By setting it in this way, it is ensured that the second contact surface is large enough, which is beneficial to improving the deviation correction effect.

[0011] In one embodiment, the parallelism between the second contact surface and the first contact surface is 0.01 mm.

[0012] The beneficial effects of adopting the above technical solution are as follows: By setting it in this way, it is ensured that the first contact surface and the second contact surface have a high degree of parallelism.

[0013] In one embodiment, the vertical dimension of the gap is 0.5 mm to 0.8 mm.

[0014] In one embodiment, a first connection hole for connecting the upper punch on the rotary press-fitting device is coaxially provided on the first pressing block.

[0015] In one embodiment, a second connection hole for connecting the upper punch on the rotary press-fitting device is coaxially provided on the second pressing block.

[0016] In one embodiment, the diameter of the part of the first pressing block below the first contact surface is smaller than the inner hole diameter of the valve seat.

[0017] The beneficial effects of adopting the above technical solution are as follows: By setting it in this way, it is ensured that the first contact surface can be in surface contact with the upper end surface of the valve seat.

[0018] In one embodiment, the diameter of the part of the second pressing block below the third contact surface is smaller than the inner hole diameter of the valve seat.

[0019] The beneficial effects of adopting the above technical solution are as follows: By setting it in this way, it is ensured that the third contact surface can be in surface contact with the upper end surface of the valve seat.

[0020] In one embodiment, the valve seat press-fitting tooling includes a third pressing block. A fourth contact surface for contacting the upper end surface of the cylinder head is provided at the lower end of the third pressing block, and the diameter of the fourth contact surface is larger than the aperture of the valve seat hole.

[0021] The beneficial effects of adopting the above technical solution are as follows: For some more complex valve seats, the third pressing block can be used to perform the first deviation correction on the valve seat, and the first pressing block is used for the second deviation correction.

[0022] In one embodiment, a third connection hole for connecting the upper punch on the rotary press-fitting device is coaxially provided on the third pressing block.

[0023] The beneficial effects of the present utility model are as follows:

[0024] Before pressing down the first pressing block, the first contact surface contacts the upper end surface of the valve seat, and there is a vertical gap between the second contact surface and the upper end surface of the cylinder head. When pressing down the first pressing block, the first pressing block can only move downward in the direction where there is a gap. That is, when the second contact surface is flush with the upper end surface of the cylinder head, only the perpendicularity error between the valve seat hole and the upper end surface of the cylinder head affects, so that good rectification can be carried out after the valve seat is introduced. Then, the valve seat can be directly pressed in place by using the second pressing block, thereby avoiding shearing of the valve seat during the installation process. Brief Description of the Drawings

[0025] In the following, the present invention will be described in more detail based on embodiments and with reference to the drawings.

[0026] Wherein:

[0027] Figure 1 Shows the pressing diagram of the first pressing block in the present invention;

[0028] Figure 2 Shows the pressing diagram of the second pressing block in the present invention;

[0029] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0030] Reference Numerals:

[0031] 1 - First pressing block, 101 - First connection hole, 102 - First contact surface, 103 - Second contact surface, 2 - Gap, 3 - Cylinder head, 301 - Valve seat hole, 4 - Valve seat, 5 - Second pressing block, 501 - Second connection hole, 502 - Third contact surface. Detailed Description of the Embodiments

[0032] The present invention will be further described below with reference to the drawings.

[0033] The present invention provides a valve seat pressing tooling, as Figure 1 and Figure 2 shown, which includes:

[0034] A first pressing block 1, the lower part of the first pressing block 1 is provided with a first contact surface 102 for surface contact with the upper end surface of the valve seat 4 and a second contact surface 103 for surface contact with the upper end surface of the cylinder head 3. The second contact surface 103 is located above the first contact surface 102. The first contact surface 102 is perpendicular to the pressing direction of the valve seat 4, the first contact surface 102 is parallel to the second contact surface 103, and the outer contour dimensions of the first contact surface 102 match the outer contour dimensions of the valve seat 4. Wherein, when the first contact surface 102 contacts the upper end surface of the valve seat 4, there is a vertical gap 2 between the second contact surface 103 and the upper end surface of the cylinder head 3;

[0035] The second pressing block 5 is provided with a third contact surface 502 at its lower part for surface contact with the upper end surface of the valve seat 4, and the outer contour dimensions of the second pressing block 5 match the dimensions of the upper end surface of the valve seat 4.

[0036] It can be understood that before pressing down the first pressing block 1, the first contact surface 102 contacts the upper end surface of the valve seat 4, and there is a vertical gap 2 between the second contact surface 103 and the upper end surface of the cylinder head 3. When pressing down the first pressing block 1, the first pressing block 1 can only move downward in the direction where there is a gap 2, that is, when the second contact surface 103 is flush with the upper end surface of the cylinder head 3, only the perpendicularity error between the valve seat hole 301 and the upper end surface of the cylinder head 3 affects, so that good rectification can be carried out after the valve seat 4 is introduced, and then the valve seat 4 can be directly pressed in place by using the second pressing block 5, thereby avoiding leakage caused by shearing of the valve seat 4 during the installation process, so that the valve seat 4 can meet the sealing requirements.

[0037] It should be noted that when the first pressing block 1 is rectified, the principle that the perpendicularity of a short cylinder to a large end face is small is utilized.

[0038] In one embodiment, the outer contour diameter of the second contact surface 103 is 1.2 - 1.5 times the outer contour diameter of the valve seat 4. Under the condition of meeting this multiple requirement, the outer contour diameter of the second contact surface 103 is as large as possible. The larger the outer contour diameter of the second contact surface 103, the better the rectification effect of the valve seat 4.

[0039] It can be understood that such a setting is to ensure that the second contact surface 103 is large enough, which is beneficial to improving the rectification effect.

[0040] In one embodiment, the parallelism between the second contact surface 103 and the first contact surface 102 is 0.01 mm to ensure that the first contact surface 102 and the second contact surface 103 have a high degree of parallelism.

[0041] It should be noted that to ensure that the first contact surface 102 and the second contact surface 103 have a high degree of parallelism, when the first pressing block 1 processes the first contact surface 102 and the second contact surface 103, the first contact surface 102 and the second contact surface 103 need to be processed in one station.

[0042] In one embodiment, the vertical dimension of the gap 2 is 0.5 mm - 0.8 mm.

[0043] In one embodiment, the diameter of the part of the first pressing block 1 below the first contact surface 102 is smaller than the inner hole diameter of the valve seat 4 to ensure that the first contact surface 102 can contact the upper end surface of the valve seat 4 in a surface contact manner.

[0044] In one embodiment, the diameter of the portion of the second pressing block 5 below the third contact surface 502 is smaller than the inner hole diameter of the valve seat 4 to ensure that the third contact surface 502 can be in surface contact with the upper end surface of the valve seat 4.

[0045] In one embodiment, the valve seat pressing tooling includes a third pressing block. A fourth contact surface for contacting the upper end surface of the cylinder head 3 is provided at the lower end of the third pressing block, and the diameter of the fourth contact surface is larger than the aperture of the valve seat hole 301.

[0046] It can be understood that for some more complex valve seats 4, the third pressing block can be used to perform the first rectification of the valve seat 4, and the first pressing block 1 can be used to perform the second rectification to prevent the lower part of the valve cover from being skewed during introduction.

[0047] In one embodiment, a first connection hole 101 for connecting the upper punch of the rotary pressing device is coaxially provided on the first pressing block 1; a second connection hole 501 for connecting the upper punch of the rotary pressing device is coaxially provided on the second pressing block 5; a third connection hole for connecting the upper punch of the rotary pressing device is coaxially provided on the third pressing block.

[0048] It can be understood that the punch on the rotary pressing device can be connected to the first pressing block 1, the second pressing block 5 or the third pressing block to facilitate the automatic pressing of the valve seat 4; in addition, the connection positions of the first pressing block 1, the second pressing block 5 and the third pressing block with the rotary pressing device are respectively located in the middle of the first pressing block 1, the second pressing block 5 and the third pressing block, so that the pressing force is preferably located in the middle of the first pressing block 1, the second pressing block 5 and the third pressing block, thereby facilitating the direct pressing of the valve seat 4 in place.

[0049] Currently, this valve seat pressing tooling has been used for the cold pressing of the valve seat 4 of the 280 cylinder head, solving the problem that it was not easy to rectify by visual inspection before. The pressing process of this valve seat pressing tooling is as follows:

[0050] Press down the first pressing block 1 so that the first contact surface 102 contacts the upper end surface of the valve seat 4;

[0051] Continue to press down the first pressing block 1 until the second contact surface 103 is flush with the upper end surface of the cylinder head 3;

[0052] Switch to the second pressing block 5 and then press down the second pressing block 5 so that the third contact surface 502 contacts the upper end surface of the valve seat 4;

[0053] Continue to press down the second pressing block 5 until the pressing is in place.

[0054] In addition, this valve seat pressing tooling can also be applied to the pressing of the valve seat 4 of the MAN engine cylinder head. The specific pressing process is as follows:

[0055] Press down the third pressing block so that the fourth contact surface contacts the upper end surface of the valve seat 4;

[0056] Continue to press down the third pressing block until the fourth contact surface is flush with the upper end surface of the cylinder head 3;

[0057] Switch to the first pressing block 1 and then press down the first pressing block 1 so that the first contact surface 102 contacts the upper end surface of the valve seat 4;

[0058] Continue to press down the first pressing block 1 until the second contact surface 103 is flush with the upper end surface of the cylinder head 3;

[0059] Switch to the second pressing block 5 and then press down the second pressing block 5 so that the third contact surface 502 contacts the upper end surface of the valve seat 4;

[0060] Continue to press down the second pressing block 5 until the pressing is in place.

[0061] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0062] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not deviate from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A valve seat pressing tooling, characterized in that, Comprising: A first pressing block (1), the lower part of the first pressing block (1) is provided with a first contact surface (102) for surface contact with the upper end surface of the valve seat (4) and a second contact surface (103) for surface contact with the upper end surface of the cylinder head (3), the second contact surface (103) is located above the first contact surface (102), the first contact surface (102) is perpendicular to the pressing direction of the valve seat (4), the first contact surface (102) is parallel to the second contact surface (103), the outer contour dimensions of the first contact surface (102) match the outer contour dimensions of the valve seat (4), wherein when the first contact surface (102) contacts the upper end surface of the valve seat (4), there is a vertical gap (2) between the second contact surface (103) and the upper end surface of the cylinder head (3); A second pressing block (5), the lower part of the second pressing block (5) is provided with a third contact surface (502) for surface contact with the upper end surface of the valve seat (4), and the outer contour dimensions of the second pressing block (5) match the dimensions of the upper end surface of the valve seat (4).

2. The valve seat press-fitting tooling according to claim 1, characterized in that, The outer contour diameter of the second contact surface (103) is 1.2 to 1.5 times the outer contour diameter of the valve seat (4).

3. The valve seat press-fitting tooling according to claim 1, characterized in that, The parallelism between the second contact surface (103) and the first contact surface (102) is 0.01 mm.

4. A valve seat press-fitting tooling according to claim 1, characterized in that, The vertical dimension of the gap (2) is 0.5 mm to 0.8 mm.

5. A valve seat press-fitting tooling according to any one of claims 1-4, characterized in that, A first connection hole (101) for connecting the upper punch of the rotary pressing device is coaxially arranged on the first pressing block (1).

6. A valve seat press-fitting tooling according to any one of claims 1-4, characterized in that, A second connection hole (501) for connecting the upper punch of the rotary pressing device is coaxially arranged on the second pressing block (5).

7. A valve seat press-fitting tooling according to any one of claims 1-4, characterized in that, The diameter of the part of the first pressing block (1) below the first contact surface (102) is smaller than the inner hole diameter of the valve seat (4).

8. A valve seat press-fitting tooling according to any one of claims 1-4, characterized in that, The diameter of the part of the second pressing block (5) below the third contact surface (502) is smaller than the inner hole diameter of the valve seat (4).

9. A valve seat press-fitting tooling according to any one of claims 1-4, characterized in that, Comprising a third pressing block, the lower end of the third pressing block is provided with a fourth contact surface for contacting the upper end surface of the cylinder head (3), and the diameter of the fourth contact surface is larger than the diameter of the valve seat hole (301).

10. The valve seat press-fitting tooling according to claim 9, characterized in that, A third connection hole for connecting the upper punch of the rotary pressing device is coaxially arranged on the third pressing block.

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