High-uniform-density powder metallurgy valve guide pipe

Abstract

The high-uniform-density powder metallurgy valve guide pipe comprises a pipe body, the top of the pipe body is provided with a through groove from top to bottom, a valve rod can be inserted into the through groove, the top of the outer side wall of the pipe body is provided with an annular groove, a clamping ring is arranged in the annular groove in a sleeved mode, and the inner bottom wall of the annular groove is concaved inwards to form an oil storage cavity. And an oil discharge hole communicated with the through groove is formed in the bottom of the oil storage cavity. The utility model relates to the technical field of valve guide pipes. According to the high-uniform-density powder metallurgy valve guide pipe, excessive oil liquid in the through groove can be stored through the oil storage cavity and the oil discharge hole, the oil liquid can be effectively prevented from overflowing, and therefore the valve guide pipe is prevented from being polluted in the using process, and the valve guide pipe is made to be more practical.

Description

Technical Field

[0001] The utility model relates to the technical field of valve guide tubes, in particular to a high-uniform-density powder metallurgy valve guide tube. Background Art

[0002] The valve guide supports and guides the valves that reciprocate inside it, ensuring that the valves fit the valve seats correctly and also conducting heat. There are two types of valve guides: integral and embedded. In the integral valve guide, the valve stem hole is directly machined in the cylinder head, while in the embedded valve guide, a cylindrical tube is pressed into the guide hole in the cylinder head. Some valve guides have annular grooves on the outer cylindrical surface, and a retaining ring is inserted for positioning, limiting the depth of the lower end into the airway and preventing it from falling off.

[0003] In the prior art, when the valve stem moves in the valve guide, it is lubricated by splashing oil. As the valve stem continues to move, the oil brought into the valve guide by the valve stem gradually increases, causing the oil to overflow along the inner hole of the valve guide, making the valve guide susceptible to contamination. Utility Model Content

[0004] According to the shortcomings of the prior art, the purpose of the utility model is to provide a high-uniform density powder metallurgy valve guide so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A high uniform density powder metallurgy valve guide comprises a tube body, wherein a through groove for inserting a valve stem is provided on the top of the tube body from top to bottom, an annular groove is provided on the top of the outer wall of the tube body, a retaining ring is sleeved in the annular groove, an inner bottom wall of the annular groove is concave to form an oil storage cavity, and an oil discharge hole connected to the through groove is provided at the bottom of the oil storage cavity.

[0007] Furthermore, the inner bottom wall of the oil storage cavity is gradually concave from the outside to the inside to form an inclined surface for guiding the flow of oil.

[0008] Furthermore, the top opening and the bottom opening of the through slot are both chamfered.

[0009] Furthermore, the outer side wall of the bottom of the tube body is gradually concave from top to bottom to form a guiding surface for facilitating the insertion of the tube body into the valve seat.

[0010] Furthermore, an opening of the oil drain hole in the oil storage cavity is higher than an opening of the oil drain hole in the through groove.

[0011] Furthermore, a sealing ring is embedded in the bottom of the clamping ring, and the bottom of the sealing ring contacts the outer edge of the inner bottom wall of the annular groove.

[0012] In summary, the present invention includes at least one of the following beneficial technical effects:

[0013] 1. The high uniform density powder metallurgy valve guide can be used to store excess oil in the through groove by providing an oil storage cavity and an oil drain hole, which can effectively prevent the oil from overflowing, thereby preventing the valve guide from being contaminated during use, making the valve guide more practical;

[0014] 2. The high uniform density powder metallurgy valve guide can reduce the gap between the clamping ring and the oil storage cavity by means of the provided sealing ring, thereby effectively avoiding oil spillage and effectively preventing the valve guide from being contaminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The utility model is a schematic structural diagram of a high uniform density powder metallurgy valve guide.

[0017] Figure 2 The utility model is a schematic diagram of the internal structure of a high uniform density powder metallurgy valve guide.

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0019] In the figure, 1, tube body; 2, through groove; 3, annular groove; 4, retaining ring; 5, oil storage chamber; 6, oil drain hole; 7, inclined surface; 8, chamfer; 9, guide surface; 10, sealing ring. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] Example:

[0022] Reference Figure 1 - Figure 3The utility model discloses a high uniform density powder metallurgy valve guide, comprising a tube body 1, a through groove 2 for inserting a valve stem is opened from top to bottom on the top of the tube body 1, a circular groove 3 is opened on the top of the outer wall of the tube body 1, a retaining ring 4 is sleeved in the circular groove 3, an inner bottom wall of the circular groove 3 is concave to form an oil storage cavity 5, and an oil discharge hole 6 connected with the through groove 2 is opened at the bottom of the oil storage cavity 5.

[0023] In this embodiment, the tube body 1 is inserted into the valve seat, and the valve stem is inserted into the through groove 2 of the tube body 1. Then, during the operation of the valve stem, the valve stem will bring the splashed oil into the through groove 2, and the oil entering the through groove 2 will adhere to the inner wall to provide lubrication for the valve stem for a long time. Then, during the reciprocating operation of the valve stem, the oil in the through groove 2 will gradually increase, so the old oil in the through groove 2 will be lifted up by the new oil and flow upward until the oil enters the oil drain hole 6. At this time, the oil will be squeezed and flow back along the oil drain hole 6 until the oil enters the oil storage chamber 5 for storage, which can effectively prevent the oil from overflowing the valve guide when the valve stem reciprocates, thereby improving the practicality of the valve guide.

[0024] In a further preferred embodiment of the present invention, Figure 3 As shown, the inner bottom wall of the oil storage cavity 5 is gradually concave from the outside to the inside to form a slope 7 for guiding the flow of oil.

[0025] In this embodiment, the inclined surface 7 can be provided to guide the flow of oil, so that after the valve stem stops running, the oil flows into the oil drain hole 6 under the action of gravity, and then the oil enters the gap between the through groove 2 and the valve stem through the oil drain hole 6 and flows downward along the gap, which can effectively prevent the oil from accumulating in the oil storage chamber 5 and affecting the subsequent oil storage volume, and can make the valve guide more practical.

[0026] In a further preferred embodiment of the present invention, Figure 2 As shown, the top opening and the bottom opening of the through slot 2 are both processed with chamfers 8.

[0027] In this embodiment, because the valve stem needs to be inserted into the through groove 2, and the movable gap left between the through groove 2 and the valve stem is usually small, it will increase the difficulty of installing the valve stem. Therefore, chamfers 8 are processed at the top opening and the bottom opening of the through groove 2, which can not only remove the burrs generated when the through groove 2 is processed, but also increase the entrance when the valve stem is installed, making the installation of the valve guide rod simpler, thereby making the use of the valve guide more convenient.

[0028] In a further preferred embodiment of the present invention, Figure 2 As shown, the bottom outer wall of the tube body 1 is gradually concave from top to bottom to form a guide surface 9 for facilitating the insertion of the tube body 1 into the valve seat.

[0029] In this embodiment, because the valve guide needs to be inserted into the valve seat, in order to ensure that the valve guide does not loosen after insertion, an interference fit is provided between the valve guide and the valve seat, which will cause the outer diameter of the valve guide to be larger than the inner diameter of the valve seat, making it difficult to align the valve guide during insertion, thereby increasing the difficulty of installing the valve guide.

[0030] Therefore, a guide surface 9 is provided at the bottom of the tube body 1, which can reduce the outer diameter of the bottom of the tube body 1, so that the bottom of the valve guide can be easily inserted into the valve seat, and then the valve guide is pressed into the valve seat by a hydraulic press, which can effectively reduce the difficulty of installing the valve guide and further improve the practicality of the valve guide.

[0031] In a further preferred embodiment of the present invention, Figure 2 As shown, the opening of the oil drain hole 6 in the oil storage chamber 5 is higher than the opening of the oil drain hole 6 in the through groove 2 .

[0032] In this embodiment, by making the opening of the oil drain hole 6 in the oil storage chamber 5 higher than the opening of the oil drain hole 6 in the through groove 2, a height difference can be formed in the oil drain hole 6, so that after the oil in the oil storage chamber 5 enters the oil drain hole 6, the oil can naturally slide down under the action of gravity, so that the oil can be discharged stably, so that the oil in the oil storage chamber 5 can be stably emptied when the valve stem stops.

[0033] In a further preferred embodiment of the present invention, Figure 3 As shown, a sealing ring 10 is embedded in the bottom of the clamping ring 4 , and the bottom of the sealing ring 10 contacts the outer edge of the inner bottom wall of the annular groove 3 .

[0034] In this embodiment, in order to limit the depth of the tube body 1 drawn into the valve seat, a snap ring 4 is connected to the outer wall of the tube body 1. The provision of the snap ring 4 will result in a gap between the oil storage cavity 5 and the snap ring 4, which will cause the oil to overflow along the gap, thereby creating a risk of contaminating the valve guide. Therefore, a sealing ring 10 is provided at the bottom of the snap ring 4, and the bottom of the sealing ring 10 contacts the outer edge of the inner bottom wall of the annular groove 3. The sealing ring 10 can be used to reduce the gap between the snap ring 4 and the oil storage cavity 5, which can effectively prevent the oil from overflowing and effectively prevent the valve guide from being contaminated.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high uniform density powder metallurgy valve guide, comprising a tube body (1), wherein a through groove (2) for inserting a valve stem is provided on the top of the tube body (1) from top to bottom, wherein: The top of the outer wall of the tube body (1) is provided with an annular groove (3), a retaining ring (4) is sleeved in the annular groove (3), the inner bottom wall of the annular groove (3) is concave to form an oil storage cavity (5), and the bottom of the oil storage cavity (5) is provided with an oil discharge hole (6) connected to the through groove (2).

2. The high uniform density powder metallurgy valve guide according to claim 1, characterized in that: The inner bottom wall of the oil storage cavity (5) is gradually concave from the outside to the inside to form an inclined surface (7) for guiding the flow of oil.

3. The high uniform density powder metallurgy valve guide according to claim 1, characterized in that: The top opening and the bottom opening of the through groove (2) are both processed with chamfers (8).

4. The high uniform density powder metallurgy valve guide according to claim 1, characterized in that: The outer side wall of the bottom of the tube body (1) is gradually concave from top to bottom, so as to form a guide surface (9) that facilitates the insertion of the tube body (1) into the valve seat.

5. The high uniform density powder metallurgy valve guide according to claim 1, characterized in that: The opening of the oil drain hole (6) in the oil storage chamber (5) is higher than the opening of the oil drain hole (6) in the through groove (2).

6. The high uniform density powder metallurgy valve guide according to claim 1, characterized in that: A sealing ring (10) is embedded in the bottom of the clamping ring (4), and the bottom of the sealing ring (10) contacts the outer edge of the inner bottom wall of the annular groove (3).

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