Pulley bearing protection structure and compressor

Abstract

The utility model provides a pulley bearing protection structure and a compressor, the pulley bearing protection structure provided includes: a pulley, the pulley includes a base, an inner ring and an outer ring, the inner ring and the outer ring both protrude from one side of the base along the axial direction of the base, and the inner wall of the inner ring is recessed with a mounting groove radially outward; a pulley bearing, the pulley bearing includes an outer ring, an inner ring and a ball disposed between the outer ring and the inner ring; the outer ring is axially pressed into the mounting groove of the pulley, and the inner ring and the ball protrude radially inward from the inner ring of the pulley; a protective plate, the protective plate is axially assembled in the mounting groove of the outer ring of the pulley bearing and the pulley; the protective plate is used to shield the inner ring of the pulley bearing and one end of the ball facing the base. After the pulley bearing protection structure provided by the utility model is assembled to the compressor, it can effectively block sewage when the compressor is in a water-immersed state, reduce the impact of water flow on the pulley bearing and the damage of impurities in the water to the pulley bearing.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and in particular relates to a pulley bearing protection structure and a compressor. Background Art

[0002] An off-road vehicle is a vehicle designed for driving on rough terrain. It usually has a non-load-bearing body, a four-wheel drive system, a high chassis, good tire grip, a high exhaust pipe position, high horsepower, and sturdy bumpers. Since off-road vehicles may wade in water (usually sewage containing a lot of impurities) for a long time, the compressor may be soaked or even completely submerged in water. In conventional designs, Figure 1 As shown, the pulley bearing 3 is assembled in the installation step provided on the inner circumference of the pulley and then assembled to the compressor. Generally, after the assembly is completed, the inner ring 32 of the pulley bearing 3 is directly sleeved on the front end of the compressor main shaft 7 (the portion marked by the dotted box), and the outer side of the pulley bearing 3 does not have a special protection mechanism and is exposed to the outside of the compressor. Therefore, when the compressor is in a water-immersed state, impurities will enter the pulley bearing 3 with the water flow, thereby affecting the normal operation of the pulley bearing 3, causing the pulley bearing 3 to wear faster, and even causing the compressor to fail quickly. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of the utility model is to provide a pulley bearing protection structure and a compressor. After the provided pulley bearing protection structure is assembled to the compressor, it can effectively block sewage when the compressor is in a water-immersed state, reduce the impact of water flow on the pulley bearing and the damage of impurities in the water to the pulley bearing.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model provides a pulley bearing protection structure, which includes:

[0006] A pulley, the pulley comprising a base, an inner ring portion and an outer ring portion, the inner ring portion and the outer ring portion both protrude from one side of the base along the axial direction of the base, and the inner wall of the inner ring portion is recessed radially outward to form a mounting groove;

[0007] A pulley bearing, the pulley bearing comprising an outer ring, an inner ring and balls arranged between the outer ring and the inner ring; the outer ring is axially press-fitted into the mounting groove of the pulley, and the inner ring and the balls protrude radially inward from the inner ring portion of the pulley;

[0008] A protective plate is axially mounted in the outer ring of the pulley bearing and the mounting groove of the pulley; the protective plate is used to shield the inner ring of the pulley bearing and one end of the ball toward the base.

[0009] As a further description of the above technical solution, the protective plate includes a first plate body and a second plate body arranged in parallel along the axial direction, and a skirt plate body connecting the first plate body and the second plate body along the axial direction; wherein,

[0010] The two plate surfaces of the first plate body which are opposite to each other in the axial direction respectively abut against the outer ring of the pulley bearing and the installation groove of the pulley;

[0011] The second plate body is located on the inner periphery of the first plate body in the radial direction so as to shield the inner ring of the pulley bearing and one end of the ball bearing facing the base.

[0012] As a further description of the above technical solution, a preset gap is formed between the second plate body and the inner ring and the ball of the pulley bearing in the axial direction.

[0013] As a further description of the above technical solution, the second plate body is provided with a plurality of through holes along the axial direction.

[0014] As a further description of the above technical solution, the multiple through holes are equidistantly distributed on the second plate body along the circumferential direction.

[0015] As a further description of the above technical solution, the connections between the first plate body, the second plate body and the skirt plate body are all rounded transitions.

[0016] As a further description of the above technical solution, the pulley also includes a guide portion axially connected to the end of the mounting groove away from the base, the guide portion is formed by the inner wall of the inner ring portion being radially recessed outward, and the inner diameter of the guide portion is larger than the inner diameter of the mounting groove.

[0017] The utility model also provides a compressor, comprising the pulley bearing protection structure as described above.

[0018] By means of the above technical solution, the outstanding effects of the utility model are:

[0019] In the pulley bearing protection structure provided by the utility model, the pulley includes a base, and an inner ring portion and an outer ring portion protruding from one side of the base along the axial direction of the pulley, and the inner wall of the inner ring portion is recessed with a mounting groove radially outward to install the pulley bearing composed of an outer ring, an inner ring and a ball. After the pulley bearing is assembled on the pulley, the outer ring included in it is pressed into the mounting groove of the pulley along the axial direction, and the inner ring and the ball included in it are protruding from the inner ring portion of the pulley radially inward. By axially assembling the added protective plate in the mounting groove of the outer ring of the pulley bearing and the pulley, the protective plate shields the inner ring of the pulley bearing and the ball toward one end of the base and protruding from the inner ring portion of the pulley radially inward, and then after the pulley bearing protection structure is assembled to the compressor, it can effectively block the sewage outside the pulley bearing when the compressor is in a water-immersed state, reduce the impact of water flow on the pulley bearing and the damage of impurities in the water to the pulley bearing, thereby effectively ensuring the stable operation of the pulley bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of a compressor suitable for a pulley in the prior art;

[0021] Figure 2 This is a structural schematic diagram of the pulley bearing protection structure in the embodiment of the utility model;

[0022] Figure 3 This is a cross-sectional view of the pulley bearing protection structure in the embodiment of the utility model;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0024] Description of Figure Numbers:

[0025] 11. Base; 12. Inner ring; 13. Outer ring; 2. Mounting groove; 3. Pulley bearing; 31. Outer ring; 32. Inner ring; 4. Protective plate; 41. First plate body; 42. Second plate body; 43. Skirt plate body; 5. Through hole; 6. Guide part; 7. Main shaft. DETAILED DESCRIPTION

[0026] 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.

[0027] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0028] See also Figures 2 to 4 The utility model discloses a pulley bearing protection structure, which includes:

[0029] A pulley, the pulley comprising a base 11, an inner ring portion 12 and an outer ring portion 13, the inner ring portion 12 and the outer ring portion 13 both protrude from one side of the base 11 along the axial direction of the base 11, and the inner wall of the inner ring portion 12 is recessed with a mounting groove 2 radially outward;

[0030] A pulley bearing 3, the pulley bearing 3 comprising an outer ring 31, an inner ring 32 and balls arranged between the outer ring 31 and the inner ring 32; the outer ring 31 is axially press-fitted into the mounting groove 2 of the pulley, and the inner ring 32 and the balls protrude radially inward from the inner ring portion 12 of the pulley;

[0031] The protective plate 4 is axially mounted in the outer ring 31 of the pulley bearing 3 and the mounting groove 2 of the pulley; the protective plate 4 is used to shield the inner ring 32 of the pulley bearing 3 and one end of the ball toward the base 11.

[0032] In the above arrangement, the pulley includes a base 11, and an inner ring portion 12 and an outer ring portion 13 protruding from one side of the base 11 along the axial direction of the pulley, and the inner wall of the inner ring portion 12 is recessed with a mounting groove 2 radially outward to install the pulley bearing 3 composed of the outer ring 31, the inner ring 32 and the balls. After the pulley bearing 3 is assembled on the pulley, the outer ring 31 is axially pressed into the mounting groove 2 of the pulley, and the inner ring 32 and the balls included therein protrude radially inward from the inner ring portion 12 of the pulley. By axially assembling the added protective plate 4 between the outer ring 31 of the pulley bearing 3 and the mounting groove 2 of the pulley, the protective plate 4 will shield the inner ring 32 of the pulley bearing 3 and the part of the ball that faces the end of the base 11 and protrudes radially inward from the inner ring portion 12 of the pulley. When the pulley bearing protection structure is assembled to the compressor in a conventional manner, it can effectively block sewage that may invade the pulley bearing 3 when the compressor is submerged in water, reduce the impact of water flow on the pulley bearing 3 and the damage of impurities in the water to the pulley bearing 3, thereby effectively ensuring the normal operation of the pulley bearing 3, and significantly improving the stability and reliability of the compressor operation.

[0033] See also Figure 2 and Figure 3 Specifically, in this embodiment, the pulley includes a base 11 in the shape of a circular plate, and the inner ring portion 12 and the outer ring portion 13 thereof are integrally formed with the base 11, and as Figure 3 As shown, the inner ring portion 12 and the outer ring portion 13 protrude from the same side (lower side) of the base portion 11 along the axial direction of the base portion 11 so as to be adapted to the front end of the compressor main shaft 7 .

[0034] See also Figure 3 and Figure 4 Specifically, in this embodiment, the protective plate 4 includes a first plate body 41 and a second plate body 42 which are arranged in parallel along the axial direction, and a skirt plate body 43 which connects the first plate body 41 and the second plate body 42 along the axial direction; wherein, the two axially opposite plate surfaces of the first plate body 41 respectively abut against the outer ring 31 of the pulley bearing 3 and the mounting groove 2 of the pulley; the second plate body 42 is located radially on the inner periphery of the first plate body 41 to shield the inner ring 32 of the pulley bearing 3 and the end of the ball toward the base 11.

[0035] Specifically, in this embodiment, the connection between the first plate body 41 and the second plate body 42 and the skirt plate body 43 are all rounded transitions, thereby avoiding the problem of stress concentration.

[0036] Specifically, in the present embodiment, a preset gap is provided between the second plate body 42 and the inner ring 32 and the ball of the pulley bearing 3 in the axial direction. While ensuring that it can shield the inner ring 32 and the ball of the pulley bearing 3, friction between itself and the inner ring 32 and / or the ball of the pulley bearing 3 is avoided, thereby not causing additional wear to the pulley bearing 3.

[0037] Please continue reading Figure 2 and Figure 3 Specifically, in this embodiment, since the inner ring 32 and the ball of the pulley bearing 3 are shielded as a low-precision area, there is no need to seal and increase the cost investment, so four through holes 5 can be opened in the second plate body 42 along the axial direction, and the cross-sectional area of ​​each through hole 5 is small, so that after the pulley bearing protection structure is assembled to the front end of the compressor main shaft 7 as a whole, even if the compressor is in a state of immersion for a long time, the second plate body 42 can effectively block the sewage, reduce the impact of the water flow on the pulley bearing 3, and reduce the damage of impurities in the sewage to the pulley bearing 3; and since the pulley is in a rotating state during the operation of the compressor, after the pulley bearing 3 is out of the immersion state, the water flow entering between the second plate body 42 and the pulley bearing 3 can also be quickly discharged through the four through holes 5 under the action of the centrifugal force of the rotation of the main shaft 7, thereby reducing the probability of the pulley bearing 3 being damaged. Of course, in other embodiments, the through holes 5 opened in the second plate body 42 can also be other numbers. Specifically, in this embodiment, the four through holes 5 are equidistantly distributed on the second plate body 42 along the circumferential direction.

[0038] Please continue reading Figure 3 and Figure 4Specifically, in the present embodiment, the pulley further comprises a guide portion 6 axially connected to the end of the mounting groove 2 which is away from the base 11, the guide portion 6 being formed by the inner wall of the inner ring portion 12 being radially recessed outward, the inner diameter of the guide portion 6 being larger than the inner diameter of the mounting groove 2, and preferably, the inner diameter of the guide portion 6 gradually shrinks axially from the end thereof which is away from the mounting groove 2 toward the mounting groove 2, thereby playing a guiding role in the process of assembling the pulley bearing 3 into the mounting groove 2. The assembly process of the three components in the pulley bearing protection structure is as follows: first, the protection plate 4 is assembled to the mounting groove 2 from bottom to top, so that the upper plate surface of the first plate body 41 of the protection plate 4 contacts the downward end surface of the mounting groove 2, and then the pulley bearing 3 is placed in the guide portion 6 from bottom to top, and then the pulley bearing 3 can be pressed axially upward into the mounting groove 2 (by cold pressing), so that the upper end surface of the outer ring 31 of the pulley bearing 3 abuts against the lower plate surface of the first plate body 41, so that the entire protection plate 4 is fixed between the mounting groove 2 and the pulley bearing 3, and the second plate body 42 included in the protection plate 4 is located on the inner periphery of the first plate body 41 and connected to the first plate body 41 through the skirt plate body 43, which will shield the inner ring 32 of the pulley bearing 3 and the part of the ball facing the end of the base 11 and protruding radially inward from the inner ring portion 12 of the pulley. After the pulley bearing protection structure is assembled to the front end of the compressor main shaft 7, it can effectively block impurities in sewage when immersed in water.

[0039] Specifically, the utility model also provides a compressor, including the pulley bearing protection structure as described above.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pulley bearing protection structure, characterized in that: include: A pulley, the pulley comprising a base, an inner ring portion and an outer ring portion, the inner ring portion and the outer ring portion both protrude from one side of the base along the axial direction of the base, and the inner wall of the inner ring portion is recessed radially outward to form a mounting groove; A pulley bearing, the pulley bearing comprising an outer ring, an inner ring and balls arranged between the outer ring and the inner ring; the outer ring is axially press-fitted into the mounting groove of the pulley, and the inner ring and the balls protrude radially inward from the inner ring portion of the pulley; A protective plate is axially mounted in the outer ring of the pulley bearing and the mounting groove of the pulley; the protective plate is used to shield the inner ring of the pulley bearing and one end of the ball toward the base.

2. The pulley bearing protection structure according to claim 1, characterized in that: The protective plate comprises a first plate body and a second plate body arranged in parallel along the axial direction, and a skirt plate body connecting the first plate body and the second plate body along the axial direction; wherein, The two plate surfaces of the first plate body which are opposite to each other in the axial direction respectively abut against the outer ring of the pulley bearing and the installation groove of the pulley; The second plate body is located on the inner periphery of the first plate body in the radial direction so as to shield the inner ring of the pulley bearing and one end of the ball bearing facing the base.

3. The pulley bearing protection structure according to claim 2, characterized in that: The second plate has a preset gap between the inner ring of the pulley bearing and the balls in the axial direction.

4. The pulley bearing protection structure according to claim 3, characterized in that: The second plate body is provided with a plurality of through holes along the axial direction.

5. The pulley bearing protection structure according to claim 4, characterized in that: The plurality of through holes are equidistantly distributed on the second plate along the circumferential direction.

6. The pulley bearing protection structure according to claim 2, characterized in that: The connections between the first plate body, the second plate body and the skirt plate body are all rounded transitions.

7. The pulley bearing protection structure according to claim 1, characterized in that: The pulley further comprises a guide portion axially connected to one end of the mounting groove away from the base portion, the guide portion is formed by the inner wall of the inner ring portion being recessed radially outward, and the inner diameter of the guide portion is greater than the inner diameter of the mounting groove.

8. A compressor, characterized in that: It comprises the pulley bearing protection structure as described in any one of claims 1-7.

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