Crankshaft of air conditioner compressor of new energy automobile

Abstract

The utility model relates to a new energy automobile air conditioner compressor crankshaft, and relates to the field of air conditioner compressors, the new energy automobile air conditioner compressor crankshaft comprises a crank arm, a main shaft and an eccentric journal, the main shaft and the eccentric journal are arranged on the crank arm, a plurality of pits are formed in the surface of the eccentric journal, and the density of the pits is reduced in the direction away from the middle of the eccentric journal. By optimizing the distribution of the pits, lubricating oil can flow from the two sides of the eccentric journal to the middle area, and even if the rotating speed of the crankshaft is high, the middle area of the eccentric journal can obtain enough lubricating oil.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of air conditioner compressor, especially a new energy automobile air conditioner compressor crankshaft. BACKGROUND

[0002] The air conditioner compressor is the core component of the air conditioner system, and its performance directly affects the refrigeration effect and energy efficiency ratio of the air conditioner. In the air conditioner compressor, the crankshaft is a key moving part that converts the rotary motion of the motor into the reciprocating motion of the piston. The crankshaft is usually composed of a main shaft, an eccentric shaft neck and a crank arm. The connection between the eccentric shaft neck and the connecting rod is one of the most complex and concentrated parts of the crankshaft during operation.

[0003] During actual operation, due to the relative motion between the eccentric shaft neck and the connecting rod, a large friction force and wear will be generated. Especially in the case of high-speed operation or long-time work, friction will cause temperature rise, and thus aggravate wear, and even may cause poor lubrication, noise increase and other problems, ultimately affecting the service life and energy efficiency of the compressor.

[0004] In order to reduce the friction between the eccentric shaft neck and the connecting rod, some air conditioner compressors adopt the splash lubrication method. In the splash lubrication, the crank arm and the eccentric shaft neck are immersed in the oil pool during the rotation of the crankshaft, and the centrifugal force generated by the rotation splashes the lubricating oil to form oil mist or oil droplets, which are splashed to the surface of the crankshaft. The lubricating oil penetrates into the contact surface through the assembly gap between the eccentric shaft neck and the connecting rod, forming a lubricating film, thereby reducing friction and wear. However, when the crankshaft rotates at a high speed, the lubricating oil is difficult to fully penetrate into the middle region of the eccentric shaft neck, which easily leads to uneven lubrication of the contact surface between the eccentric shaft neck and the connecting rod, and needs to be improved. SUMMARY

[0005] The utility model aims at providing a new energy automobile air conditioner compressor crankshaft to solve the technical problems in the above background.

[0006] The utility model is realized as follows:

[0007] A new energy automobile air conditioner compressor crankshaft, comprising a crank arm, a main shaft and an eccentric shaft neck arranged on the crank arm, a plurality of pits are arranged on the surface of the eccentric shaft neck, and the density of the pits decreases in the direction away from the middle part of the eccentric shaft neck.

[0008] By adopting the technical scheme, when the connecting rod is connected with the eccentric shaft neck, the recesses arranged on the surface of the eccentric shaft neck facilitate the lubricating oil to enter the gap between the eccentric shaft neck and the connecting rod. By optimizing the distribution of the recesses, the lubricating oil can flow from the two sides of the eccentric shaft neck to the middle region, so that the lubricating oil can uniformly cover the entire contact surface. Even if the rotating speed of the crankshaft is high, the middle region of the eccentric shaft neck can also obtain sufficient lubricating oil, thereby reducing the problems of local friction increase and wear aggravation caused by uneven lubrication.

[0009] Preferably, the edge of the recess is provided with a fillet, and the fillet is arranged around the recess.

[0010] By adopting the technical scheme, the fillet arranged on the edge of the recess is beneficial to reducing the friction between the eccentric shaft neck and the connecting rod.

[0011] Preferably, an annular groove is arranged on the crank arm and arranged around the outer periphery of the eccentric shaft neck, a abutting ring is rotatably connected to the crank arm, the annular groove is used for clamping the abutting ring, one end of the abutting ring close to the eccentric shaft neck protrudes out of the annular groove, and the abutting ring is used for limiting the connecting rod by abutting against the opposite ends of the connecting rod.

[0012] By adopting the technical scheme, the abutting ring arranged on the crank arm is beneficial to reducing the friction between the connecting rod and the crank arm during the working process of the crankshaft.

[0013] Preferably, a limiting groove is arranged on the inner wall of the annular groove and arranged around the outer periphery of the eccentric shaft neck, and a plurality of rolling balls are rotatably connected to the outer ring surface of the abutting ring, and the limiting groove is used for clamping the plurality of rolling balls.

[0014] By adopting the technical scheme, the friction between the abutting ring and the crank arm is reduced, and the friction of the connecting rod moving on the eccentric shaft neck is further reduced.

[0015] Preferably, a plurality of oil inlets are equally and spacedly arranged on the outer ring surface of the abutting ring, and the oil inlets are located outside the annular groove, so as to facilitate the lubricating oil to enter the gap between the eccentric shaft neck and the connecting rod.

[0016] By adopting the technical scheme, when the crankshaft rotates and the eccentric shaft neck, the connecting rod and the abutting ring are immersed in the lubricating oil, the oil inlets arranged on the abutting ring are beneficial to the lubricating oil entering the gap between the eccentric shaft neck and the connecting rod through the oil inlets.

[0017] Preferably, a lubricating groove is arranged on the main shaft and arranged in a spiral shape around the main shaft.

[0018] By adopting the technical scheme, the lubricating effect of the main shaft is improved.

[0019] Preferably, the cross section of the lubricating groove is trapezoidal.

[0020] By adopting the technical scheme, the slope of the trapezoidal cross section can reduce the flow resistance of the lubricating oil, so that the lubricating oil can flow more easily into the lubricating groove and flow in the spiral direction.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] 1. The utility model discloses a distribution of the recess is optimized, and lubricating oil can flow from the two sides of the eccentric shaft journal to the middle region, so that the middle region of the eccentric shaft journal can obtain enough lubricating oil even if the rotating speed of the crankshaft is high.

[0023] 2. The utility model discloses a chamfer is arranged on the edge of the recess, which is beneficial to reducing the friction between the eccentric shaft journal and the connecting rod.

[0024] 3. The utility model discloses a limiting ring is arranged on the crank arm to limit the connecting rod, which is beneficial to reducing the friction between the connecting rod and the crank arm during the working process of the crankshaft. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the overall structure schematic diagram of the utility model;

[0026] Figure 2 It is the overall structure schematic diagram of the utility model connecting rod after installation;

[0027] Figure 3 It is the sectional view of the embodiment locally on the crank arm, mainly showing the structure of the limiting ring;

[0028] The description of the drawings is as follows: 1, the crank arm;11, annular groove;111, limiting groove;2, main shaft;21, lubricating groove;3, eccentric shaft journal;31, recess;32, round corner;4, limiting ring;41, ball;42, oil inlet;5, connecting rod. DETAILED DESCRIPTION

[0029] The utility model will be further described in the specific embodiment, and the specific embodiment is as follows: Figure 1 -3:

[0030] The embodiment of the application discloses a new energy automobile air conditioner compressor crankshaft. Figure 1, including crank arm 1, main shaft 2 and eccentric journal 3, the distribution direction of crank arm 1, main shaft 2 and eccentric journal 3 is parallel to the axis direction of main shaft 2, main shaft 2 and eccentric journal 3 are located on the opposite sides of crank arm 1 respectively, main shaft 2 and eccentric journal 3 are fixedly connected with crank arm 1, the main shaft 2 of main shaft 2 and eccentric journal 3 is parallel to each other, the axis of main shaft 2 and eccentric journal 3 is not on the same straight line. Eccentric journal 3 is located on one side of adjacent crank arm 1, a spiral-shaped lubricating groove 21 is formed on the surface of main shaft 2, the cross section of lubricating groove 21 perpendicular to the axis direction of main shaft 2 is trapezoidal, and lubricating groove 21 is used for entering the splashed lubricating oil.

[0031] Referring to Figure 1 , a plurality of pits 31 are formed on the surface of eccentric journal 3, the plurality of pits 31 are distributed at intervals, the plurality of pits 31 are arranged in a gradually expanding manner away from the axis of eccentric journal 3, the plurality of pits 31 are semispherical, the edges of the plurality of pits 31 are processed to form a fillet 32, the inner wall of the pit 31 is connected with the surface of the eccentric journal 3 through the fillet 32, the fillet 32 is arranged around the outer periphery of the pit 31, and the density of the pit 31 on the surface of the eccentric journal 3 gradually decreases from the middle to the two side regions.

[0032] Referring to Figure 2 , in actual use, the connecting rod 5 is sleeved outside the eccentric journal 3, and the surface of the eccentric journal 3 is attached to the inner wall of the connecting rod 5. The rotation of the main shaft 2 drives the crank arm 1 and the eccentric journal 3 to rotate around the main shaft 2, thereby driving the connecting rod 5 to move.

[0033] Referring to Figure 2 and Figure 3 , an annular groove 11 is formed on one end of the crank arm 1 close to the eccentric journal 3, the annular groove 11 is arranged around the outer periphery of the eccentric journal 3, the crank arm 1 is rotatably connected with an abutting ring 4, the annular groove 11 is used for clamping the abutting ring 4, the abutting ring 4 is arranged around the outer periphery of the eccentric journal 3, one end of the abutting ring 4 close to the eccentric journal 3 is located outside the crank arm 1, one end of the abutting ring 4 close to the eccentric journal 3 is used for attaching the connecting rod 5, the abutting ring 4 is located on the opposite sides of the connecting rod 5 distributed parallel to the axis direction of the eccentric journal 3, and the abutting ring 4 is attached to the connecting rod 5 to limit the connecting rod 5, so that the connecting rod 5 is not easy to move in the axis direction of the eccentric journal 3 during movement.

[0034] Referring to Figure 2 and Figure 3 , a limiting groove 111 is formed on the inner wall of the annular groove 11, the limiting groove 111 is annular, the limiting groove 111 is arranged around the outer periphery of the eccentric journal 3, a plurality of balls 41 are rotatably connected on the abutting ring 4, the plurality of balls 41 are distributed at equal intervals around the abutting ring 4, the balls 41 protrude from the abutting ring 4, the limiting groove 111 is used for clamping the balls 41, thereby reducing the friction between the abutting ring 4 and the crank arm 1, and compared with directly limiting the connecting rod 5 by attaching the crank arm 1, it is beneficial to reduce the friction between the connecting rod 5 and the crank arm 1 during movement.

[0035] Referring to Figure 2 and Figure 3 The inner ring diameter of the abutment ring 4 is greater than the diameter of the eccentric journal 3. A plurality of oil inlets 42 are formed on the outer ring surface of the abutment ring 4, and the plurality of oil inlets 42 are located outside the annular groove 11. The oil inlets 42 are located on the part of the abutment ring 4 protruding from the crank arm 1, and the plurality of oil inlets 42 are uniformly distributed at equal intervals around the outer periphery of the abutment ring 4. The lubricating oil can pass through the oil inlets 42 to enter the gap between the eccentric journal 3 and the connecting rod 5.

[0036] The implementation principle of the new energy automobile air conditioner compressor crankshaft in the embodiment is as follows: the lubrication grooves 21 and the pits 31 are formed on the crankshaft, which is beneficial to reduce the weight of the crankshaft. When the crankshaft is working, the main shaft 2 drives the abutment ring 4, the eccentric journal 3 and the connecting rod 5 to immerse in the lubricating oil. The lubricating oil flows into the gap between the eccentric journal 3 and the abutment ring 4 through the oil inlets 42, and then flows into the gap between the eccentric journal 3 and the connecting rod 5, and forms an oil film between the contact surface of the eccentric journal 3 and the connecting rod 5. The lubricating oil enters the pits 31. When the eccentric journal 3 and the connecting rod 5 are separated from the lubricating oil, the lubricating oil in the pits 31 flows out of the pits 31 under the action of centrifugal force to lubricate the gap between the eccentric journal 3 and the connecting rod 5. If the rotating speed of the crankshaft is fast, when the eccentric journal 3 and the connecting rod 5 immerse in the lubricating oil, it is difficult for the lubricating oil to penetrate into the middle region of the eccentric journal 3. The density of the pits 31 in the middle region of the eccentric journal 3 is greater, and the lubricating oil in the pits 31 can be used for lubrication. The middle region of the eccentric journal 3 can also be sufficiently lubricated under the rapid rotation of the crankshaft.

[0037] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the scope of the present application. Therefore, any equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A new energy automobile air conditioner compressor crankshaft, characterized in that: The crank arm (1), the main shaft (2) and the eccentric journal (3) are arranged on the crank arm (1), the surface of the eccentric journal (3) is provided with a plurality of pits (31), and the density of the pits (31) decreases in the direction away from the middle of the eccentric journal (3).

2. The new energy automobile air conditioner compressor crankshaft according to claim 1, characterized in that: The edge of the pit (31) is provided with a round corner (32) arranged around the pit (31).

3. The new energy automobile air conditioner compressor crankshaft according to claim 1, characterized in that: The pit (31) is arranged in a gradually expanding manner in the direction away from the axis of the eccentric journal (3).

4. The new energy automobile air conditioner compressor crankshaft according to claim 1, characterized in that: The crank arm (1) is provided with an annular groove (11) arranged around the outer periphery of the eccentric journal (3), and the crank arm (1) is rotatably connected with an abutting ring (4), the annular groove (11) is used for clamping the abutting ring (4), one end of the abutting ring (4) close to the eccentric journal (3) protrudes out of the annular groove (11), and the abutting ring (4) is used for limiting the connecting rod (5) by abutting against the opposite ends of the connecting rod (5).

5. The new energy automobile air conditioner compressor crankshaft according to claim 4, characterized in that: The inner wall of the annular groove (11) is provided with a limiting groove (111) arranged around the outer periphery of the eccentric journal (3), and the outer surface of the abutting ring (4) is rotatably connected with a plurality of balls (41), the limiting groove (111) is used for clamping the plurality of balls (41).

6. The new energy automobile air conditioner compressor crankshaft according to claim 4, characterized in that: The outer surface of the abutting ring (4) is provided with a plurality of oil inlets (42) arranged at equal intervals, and the oil inlets (42) are located outside the annular groove (11), so that the lubricating oil can enter the gap between the eccentric journal (3) and the connecting rod (5).

7. The new energy automobile air conditioner compressor crankshaft according to claim 1, characterized in that: The main shaft (2) is provided with a lubricating groove (21) arranged in a spiral shape around the main shaft (2).

8. The new energy automobile air conditioner compressor crankshaft according to claim 7, characterized in that: The cross section of the lubricating groove (21) is trapezoidal.

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