Main bearing bush

Abstract

The utility model provides a main bearing bush which is characterized in that an upper bearing bush and a lower bearing bush define an annular structure, a first oil groove is formed in the inner wall of the upper bearing bush, an oil hole communicated with the first oil groove is formed in the radial direction of the upper bearing bush, a second oil groove communicated with the first oil groove is formed in the inner wall of the lower bearing bush, and the second oil groove is located at the first end of the lower bearing bush. The depth of the second oil groove is gradually reduced from the first end of the lower tile to the second end of the lower tile, and the width of the second oil groove is gradually increased from the first end of the lower tile to the second end of the lower tile. According to the main bearing bush disclosed by the invention, the depth of the second oil groove is set to be gradually shallower from the first end of the lower bearing bush to the second end of the lower bearing bush, and the width of the second oil groove is gradually increased from the first end of the lower bearing bush to the second end of the lower bearing bush, so that engine oil can be smoothly transited when entering a space between a crankshaft and the lower bearing bush from the second oil groove; and high-pressure bubbles caused by sharp change of engine oil pressure are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a main bearing bush. Background Art

[0002] The main bearing in the engine is located between the engine body and the crankshaft. It is fixed on the engine body and moves relative to the crankshaft, while bearing the load transmitted from the crankshaft. The main bearing is divided into two parts: the upper bearing and the lower bearing. The upper bearing transfers the oil from the main oil channel of the engine body to the long oil groove opened on the inner wall through the oil hole opened, so that a lubricating oil film is formed between the crankshaft and the upper bearing, reducing friction and increasing service life; and the lower bearing also has a short oil groove connected to the long oil groove of the upper bearing, so that the oil in the long oil groove enters the inner wall of the lower bearing and the crankshaft for lubrication.

[0003] However, when the engine oil flows from the short oil groove of the lower bearing through the crankshaft and the lower bearing, the drastic changes in the oil flow direction and oil pressure will cause high-pressure bubbles. The rupture of the high-pressure bubbles will impact the inner wall surface of the lower bearing and form cavitation pits, which seriously affect the reliability and life of the main bearing. Utility Model Content

[0004] In view of this, an embodiment of the utility model provides a main bearing to solve the problem of high-pressure bubbles in the lower bearing of the existing main bearing caused by the rapid changes in oil flow direction and oil pressure, and the problem of cavitation pits formed by the rupture of high-pressure bubbles and the impact on the inner wall surface of the lower bearing.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A main bearing bushing comprises: an upper bushing and a lower bushing;

[0007] The upper tile and the lower tile are combined to form a ring structure;

[0008] The inner wall of the upper shoe is provided with a first oil groove, and an oil hole connected with the first oil groove is provided along the radial direction of the upper shoe;

[0009] The inner wall of the lower shoe is provided with a second oil groove connected to the first oil groove and located at the first end of the lower shoe, wherein the depth of the second oil groove gradually becomes shallower from the first end of the lower shoe to the second end of the lower shoe, and the width of the second oil groove gradually becomes wider from the first end of the lower shoe to the second end of the lower shoe.

[0010] Preferably, the first side wall and / or the second side wall of the second oil groove is a curved surface structure.

[0011] Preferably, the upper shoe is provided with a plurality of oil holes.

[0012] Preferably, a plurality of oil holes are evenly provided along the length direction of the first oil groove.

[0013] Preferably, reinforcement blocks are provided at the ends of the outer wall of the upper tile and / or the outer wall of the lower tile.

[0014] Preferably, the height of the reinforcing block gradually decreases from the end surface inward.

[0015] Preferably, a third oil groove connected to the first oil groove is opened on the inner wall of the lower tile, and the third oil groove is located at the second end of the lower tile, wherein the depth of the third oil groove gradually becomes shallower from the second end of the lower tile to the first end of the lower tile, and the width of the second oil groove gradually becomes wider from the second end of the lower tile to the first end of the lower tile.

[0016] Preferably, the first side wall and / or the second side wall of the third oil groove is a curved surface structure.

[0017] Preferably, the length of the third oil groove is the same as the length of the second oil groove.

[0018] Based on the above-mentioned utility model, a main bearing is provided, which is formed into an annular structure by enclosing an upper bearing and a lower bearing, and a first oil groove is opened on the inner wall of the upper bearing, and an oil hole connected to the first oil groove is opened along the radial direction of the upper bearing, and a second oil groove connected to the first oil groove is opened on the inner wall of the lower bearing, and is located at the first end of the lower bearing, and the depth of the second oil groove gradually becomes shallower from the first end of the lower bearing to the second end of the lower bearing, and the width of the second oil groove gradually becomes wider from the first end of the lower bearing to the second end of the lower bearing. Through the main bearing disclosed above, since the depth of the second oil groove is set to gradually become shallower from the first end of the lower bearing to the second end of the lower bearing, and the width of the second oil groove gradually becomes wider from the first end of the lower bearing to the second end of the lower bearing, when the engine oil enters between the crankshaft and the lower bearing from the second oil groove, the engine oil can be smoothly transitioned, effectively avoiding the generation of high-pressure bubbles caused by a sharp change in engine oil pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a main bearing provided in an embodiment of the utility model;

[0021] Figure 2 A front view of an upper tile provided in an embodiment of the utility model;

[0022] Figure 3 A front view of a lower tile provided in an embodiment of the utility model.

[0023] Among them, the upper bearing 1, the first oil groove 11, the oil hole 12, the lower bearing 2, the second oil groove 21, and the reinforcement block 3. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model embodiment provides a main bearing bushing, see Figures 1 to 3 , Figure 1 The main bearing shell is a schematic diagram of the structure of the main bearing shell, which includes an upper shell 1 and a lower shell 2;

[0026] The upper tile 1 and the lower tile 2 are combined to form a ring structure;

[0027] The inner wall of the upper shoe 1 is provided with a first oil groove 11, and an oil hole 12 is provided along the radial direction of the upper shoe 1 and communicated with the first oil groove 11;

[0028] The inner wall of the lower tile 2 is provided with a second oil groove 21 which is connected to the first oil groove 11 and is located at the first end of the lower tile 2, wherein the depth of the second oil groove 21 gradually becomes shallower from the first end of the lower tile 2 to the second end of the lower tile 2, and the width of the second oil groove 21 gradually becomes wider from the first end of the lower tile 2 to the second end of the lower tile 2.

[0029] It should be noted that, by opening an oil hole 12 connected to the first oil groove 11 along the radial direction of the upper bearing 1, the engine oil in the main oil channel can enter the first oil groove 11 through the oil hole 12, and because the first oil groove 11 is connected to the second oil groove 21, the engine oil can enter the second oil groove 21. The engine oil entering the second oil groove 21 will flow to the lower bearing 2 and the crankshaft under pressure for lubrication, thereby reducing the friction between the lower bearing 2 and the crankshaft, thereby increasing the service life.

[0030] The embodiment of the utility model forms an annular structure by enclosing the upper bearing 1 and the lower bearing 2, and a first oil groove 11 is opened on the inner wall of the upper bearing 1, and an oil hole 12 connected with the first oil groove 11 is opened along the radial direction of the upper bearing 1, and a second oil groove 21 connected with the first oil groove 11 is opened on the inner wall of the lower bearing 2, and is located at the first end of the lower bearing 2, and the depth of the second oil groove 21 gradually becomes shallower from the first end of the lower bearing 2 to the second end of the lower bearing 2, and the width of the second oil groove 21 gradually becomes wider from the first end of the lower bearing 2 to the second end of the lower bearing 2. Through the main bearing disclosed above, since the depth of the second oil groove 21 is set to gradually become shallower from the first end of the lower bearing 2 to the second end of the lower bearing 2, and the width of the second oil groove 21 gradually becomes wider from the first end of the lower bearing 2 to the second end of the lower bearing 2, when the engine oil enters between the crankshaft and the lower bearing 2 from the second oil groove 21, the engine oil can be smoothly transferred, effectively avoiding the generation of high-pressure bubbles caused by the rapid change of the engine oil pressure.

[0031] Specifically, the first side wall and / or the second side wall of the second oil groove 21 is a curved surface structure.

[0032] It should be noted that only the first side wall or the second side wall of the second oil groove 21 can be set as a curved surface structure, or both the first side wall and the second side wall of the second oil groove 21 can be set as a curved surface structure. Those skilled in the art can select and set it according to needs.

[0033] Specifically, the upper shoe 1 is provided with a plurality of oil holes 12 .

[0034] It should be noted that by opening a plurality of oil holes 12 in the upper bearing 1, the amount of oil entering the first oil groove 11 per unit time can be increased, thereby enabling the main bearing and the crankshaft to be fully lubricated, reducing the friction between the main bearing and the crankshaft, and increasing the service life of the main bearing.

[0035] Furthermore, a plurality of oil holes 12 are evenly provided along the length direction of the first oil groove 11 .

[0036] It should be noted that a plurality of oil holes 12 are evenly opened along the length direction of the first oil groove 11 , which can not only increase the oil intake per unit time, but also ensure the overall structural rigidity of the upper bearing 1 .

[0037] Specifically, reinforcement blocks 3 are provided at the ends of the outer wall of the upper tile 1 and / or the outer wall of the lower tile 2 .

[0038] It should be noted that, by providing a reinforcing block 3 at the end of the outer wall of the upper tile 1 , the mechanical strength of the two ends of the upper tile 1 can be further improved to avoid deformation during use.

[0039] By providing a reinforcing block 3 at the end of the outer wall of the lower tile 2, the mechanical strength of the two ends of the lower tile 2 can be further improved to avoid deformation during use.

[0040] Furthermore, the height of the reinforcing block 3 gradually decreases from the end surface inward.

[0041] It should be noted that the height of the reinforcing block 3 is set to gradually decrease from the end surface inward, so that the cross-section of the reinforcing block 3 forms a triangular structure, and can further enhance the deformation resistance of both ends of the upper tile 1 and the lower tile 2, while also saving production costs.

[0042] Furthermore, a third oil groove connected to the first oil groove 11 is opened on the inner wall of the lower tile 2, and the third oil groove is located at the second end of the lower tile 2, wherein the depth of the third oil groove gradually becomes shallower from the second end of the lower tile 2 to the first end of the lower tile 2, and the width of the second oil groove 21 gradually becomes wider from the second end of the lower tile 2 to the first end of the lower tile 2.

[0043] It should be noted that, by opening a third oil groove connected to the first oil groove 11 on the inner wall of the lower bearing 2, and making the third oil groove located at the second end of the lower bearing 2, and making the depth of the third oil groove gradually shallower from the second end of the lower bearing 2 to the first end of the lower bearing 2, the width of the second oil groove 21 gradually widens from the second end of the lower bearing 2 to the first end of the lower bearing 2, and the engine oil entering the first oil groove 11 can also enter the lower bearing 2 and the crankshaft through the third oil groove for lubrication, further reducing the friction between the lower bearing 2 and the crankshaft, and improving the service life. In addition, when the engine oil enters between the crankshaft and the lower bearing 2 from the third oil groove, the engine oil can transition smoothly, effectively avoiding the generation of high-pressure bubbles due to sudden changes in oil pressure.

[0044] Specifically, the first side wall and / or the second side wall of the third oil groove is a curved surface structure.

[0045] It should be noted that only the first side wall or the second side wall of the third oil groove may be set as a curved surface structure, or both the first side wall and the second side wall of the third oil groove may be set as a curved surface structure. Those skilled in the art may select and set the structure according to their needs.

[0046] Specifically, the length of the third oil groove is the same as the length of the second oil groove 21 .

[0047] It should be noted that the length of the third oil groove can be set to be the same as the length of the second oil groove 21, or can be set to be different, and those skilled in the art can make a choice according to needs.

[0048] The structure of the third oil tank of the present application is the same as that of the second oil tank 21 , and therefore, it is not shown in the figure. For the specific structure, see the second oil tank 21 .

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A main bearing bushing, characterized in that: include: Upper and lower tiles; The upper tile and the lower tile are combined to form a ring structure; A first oil groove is formed on the inner wall of the upper shoe, and an oil hole connected to the first oil groove is formed along the radial direction of the upper shoe; The inner wall of the lower shoe is provided with a second oil groove connected with the first oil groove and located at the first end of the lower shoe, wherein the depth of the second oil groove gradually becomes shallower from the first end of the lower shoe to the second end of the lower shoe, and the width of the second oil groove gradually becomes wider from the first end of the lower shoe to the second end of the lower shoe.

2. The main bearing according to claim 1, characterized in that: The first side wall and / or the second side wall of the second oil groove is a curved surface structure.

3. The main bearing according to claim 1, characterized in that: The upper shoe is provided with a plurality of oil holes.

4. The main bearing according to claim 3, characterized in that: A plurality of the oil holes are evenly arranged along the length direction of the first oil groove.

5. The main bearing according to claim 1, characterized in that: The ends of the outer wall of the upper tile and / or the outer wall of the lower tile are provided with reinforcement blocks.

6. The main bearing according to claim 5, characterized in that: The height of the reinforcement block gradually decreases inward from the end surface.

7. The main bearing according to any one of claims 1 to 6, characterized in that The inner wall of the lower shoe is provided with a third oil groove connected with the first oil groove, and the third oil groove is located at the second end of the lower shoe, wherein the depth of the third oil groove gradually becomes shallower from the second end of the lower shoe to the first end of the lower shoe, and the width of the second oil groove gradually becomes wider from the second end of the lower shoe to the first end of the lower shoe.

8. The main bearing according to claim 7, characterized in that: The first side wall and / or the second side wall of the third oil groove is a curved surface structure.

9. The main bearing according to claim 8, characterized in that: The length of the third oil groove is the same as that of the second oil groove.

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