Pneumatic tool and power bearing assembly thereof
By adopting the design of dual bearing assembly, limit groove and pressure cover in pneumatic tools, the problem of pneumatic tool jamming or power failure caused by loose bearings is solved, and the stability of bearings during high-speed operation is achieved.
Patent Information
- Application Number
- CN202422599471.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing pneumatic tools may experience problems such as jamming or power failure during long-term operation due to loose bearings, and conventional assembly processes cannot effectively prevent bearing displacement during high-speed operation.
The double bearing assembly is combined with the limit groove and pressure cover design to ensure the stable installation of the bearing in the axial direction to prevent loosening.
It effectively prevents the axial movement of the bearings due to vibration during long-term operation of the pneumatic tool, avoiding the problems of machine jamming and power failure.
Smart Images
Figure CN223359716U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearing installation, in particular to a pneumatic tool and a power bearing assembly thereof. Background Art
[0002] Conventional pneumatic tools currently prevalent on the market all feature a single-bearing rear end cap. Their simplicity and low cost have led to a high market share. However, their poor durability and short lifespan result in frequent maintenance and a short service life. Furthermore, because the conventional assembly process for older products involves press-fitting the bearings onto the end cap and power shaft via a "shrink fit" process, with no axial limiter, the bearings can easily shift out of position during high-speed operation, causing vibration and friction with the end caps, leading to power failure or machine jamming.
[0003] Therefore, how to avoid the impact of bearing loosening caused by long-term operation, which may lead to the jamming of pneumatic tools or power failure, is a technical problem that technicians in this field currently need to solve. Utility Model Content
[0004] The present invention aims to provide a power bearing assembly that can prevent the bearing from loosening during long-term operation. Another object of the present invention is to provide a pneumatic tool including the power bearing assembly to solve the problem of pneumatic tool jamming or power failure.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A dynamic bearing assembly, comprising:
[0007] The housing has a power shaft passing through it and a limiting groove at the rear end of the housing;
[0008] A double bearing assembly is sleeved on the tail end of the power shaft, and the double bearing assembly is located in the limiting groove;
[0009] A gland, detachably mounted on the rear end of the power shaft to limit axial movement of the dual bearing assembly;
[0010] The end cover is detachably mounted on the rear end of the shell.
[0011] Preferably, the dual-bearing assembly includes two bearings arranged in parallel, the inner ring of the dual-bearing assembly is sleeved on the outer circumference of the tail end of the power shaft, and the outer ring of the dual-bearing assembly abuts against the inner wall of the limiting groove.
[0012] Preferably, a first stop protrusion is further provided at the tail end of the power shaft, and the first stop protrusion abuts against the inner ring of the bearing of the dual-bearing assembly;
[0013] A second stop protrusion is provided at the bottom of the limiting groove, and the second stop protrusion abuts against the bearing outer ring of the dual-bearing assembly.
[0014] Preferably, the pressure cover has a stepped shaft structure, including a first shaft and a second shaft, the diameter of the first shaft is smaller than the diameter of the second shaft, a gap is reserved between the end face of the first shaft and the tail end face of the power shaft, the outer circumferential surface of the first shaft abuts the inner wall of the inner ring of the bearing of the dual-bearing assembly, and the second shaft abuts the end of the inner ring of the bearing of the dual-bearing assembly.
[0015] Preferably, a through hole is provided in the middle of the gland along its axial direction, and a bolt hole is provided at a corresponding position at the rear end of the power shaft. The gland is installed by means of fixing bolts passing through the through hole and screwed into the bolt hole.
[0016] Preferably, a countersunk hole for accommodating a bolt head is provided at one end of the through hole facing away from the power shaft.
[0017] Preferably, the diameter of the second shaft is larger than the outer diameter of the bearing inner ring of the dual-bearing assembly, and smaller than the inner diameter of the bearing outer ring of the dual-bearing assembly.
[0018] Preferably, a corrugated gasket is provided between the end cover and the dual-bearing assembly, and the corrugated gasket abuts against the outer ring of the bearing of the dual-bearing assembly.
[0019] Preferably, an adjustment gasket is provided between the bearing inner ring of the dual-bearing assembly and the first stop protrusion, and the outer ring diameter of the adjustment gasket is smaller than the outer diameter of the bearing inner ring of the dual-bearing assembly.
[0020] The present application also provides a pneumatic tool, comprising the power bearing assembly described above.
[0021] Compared with the above-mentioned background technology, the utility model provides a power bearing assembly, including: a shell, a power shaft, a dual-bearing assembly, a pressure cover and an end cover; the power shaft is passed through the inside of the shell, and a limiting groove is provided at the rear end of the shell; the dual-bearing assembly is sleeved on the tail end of the power shaft, and the dual-bearing assembly is located in the limiting groove; the pressure cover is detachably mounted on the tail end of the power shaft to limit the axial movement of the dual-bearing assembly; the end cover is detachably mounted on the rear end of the shell.
[0022] Specifically, the power shaft is installed in the shell, one end of which is connected to the output component, and the other end, that is, the tail end of the power shaft, extends out of the shell and is located inside the limit groove at the rear section of the shell. A dual-bearing assembly is installed in the limit groove, and the dual-bearing assembly is sleeved on the outer periphery of the tail end of the power shaft to support the power shaft. In order to further prevent the dual-bearing assembly from moving due to vibration during the operation of the pneumatic tool, that is, axial movement, this application detachably installs a pressure cover at the end of the tail end of the power shaft. The pressure cover acts on the dual-bearing assembly, so that the dual-bearing assembly is stably installed in the limit groove to play a role. Finally, an end cover is installed at the rear end of the shell to protect the dual-bearing assembly, the pressure cover and the power shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0024] Figure 1 A schematic diagram of a dynamic bearing assembly provided by an embodiment of the present utility model;
[0025] Figure 2 for Figure 1 A partial enlarged view.
[0026] in:
[0027] 100-housing, 110-limiting groove, 111-second stop protrusion;
[0028] 200-power shaft, 210-first stop protrusion, 220-bolt hole;
[0029] 300-Dual bearing assembly;
[0030] 400- gland, 410- first axis, 420- second axis, 430- through hole, 440- countersunk hole;
[0031] 500-end cover, 600-fixing bolt, 700-wave washer, 800-adjusting washer. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0033] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0034] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left" and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present invention.
[0035] The present invention aims to provide a power bearing assembly that can prevent the bearing from loosening during long-term operation. Another object of the present invention is to provide a pneumatic tool including the power bearing assembly to solve the problem of pneumatic tool jamming or power failure.
[0036] To achieve the above objectives, the present invention provides the following technical solutions:
[0037] See also Figure 1 and Figure 2 , relative to the above-mentioned background technology, the present embodiment provides a dynamic bearing assembly provided by the present invention, including: a shell 100, a power shaft 200, a dual bearing assembly 300, a pressure cover 400 and an end cover 500; the power shaft 200 is passed through the inside of the shell 100, and a limiting groove 110 is provided at the rear end of the shell 100; the dual bearing assembly 300 is sleeved on the rear end of the power shaft 200, and the dual bearing assembly 300 is located in the limiting groove 110; the pressure cover 400 is detachably mounted on the rear end of the power shaft 200 to limit the axial movement of the dual bearing assembly 300; the end cover 500 is detachably mounted on the rear end of the shell 100.
[0038] Specifically, the right end of the shell 100 is the rear end of the shell 100 mentioned in this embodiment. A power shaft 200 is arranged horizontally in the middle of the shell 100, and the right end of the power shaft 200, that is, the tail end of the power shaft 200, is supported by the dual bearing assembly 300 in this embodiment, and the pressure cover 400 is installed at the right end face of the power shaft 200, which can just play the role of fixing the dual bearing assembly 300. Finally, this part is protected by the end cover 500 installed at the right end of the shell 100.
[0039] That is to say, the power shaft 200 is installed in the shell 100, one end of which is connected to the output component, and the other end, that is, the tail end of the power shaft 200, extends out of the shell 100 and is located inside the limiting groove 110 at the rear section of the shell 100. A dual bearing assembly 300 is installed in the limiting groove 110, and the dual bearing assembly 300 is sleeved on the outer periphery of the tail end of the power shaft 200 to support the power shaft 200. In order to further prevent the dual bearing assembly 300 from moving due to vibration during the operation of the pneumatic tool, that is, axial movement, a pressure cover 400 is detachably installed at the end of the tail end of the power shaft 200 of this structure. The pressure cover 400 acts on the dual bearing assembly 300, so that the dual bearing assembly 300 is stably installed in the limiting groove 110 to play a role. Finally, an end cover 500 is installed at the rear end of the shell 100 to protect the dual bearing assembly 300, the pressure cover 400 and the power shaft 200.
[0040] In this embodiment, the dual-bearing assembly 300 includes two bearings arranged in parallel. The inner ring of the bearing of the dual-bearing assembly 300 is sleeved on the outer circumference of the tail end of the power shaft 200, and the outer ring of the bearing of the dual-bearing assembly 300 abuts against the inner wall of the limiting groove 110.
[0041] Specifically, the dual-bearing assembly 300 is two bearing groups arranged in parallel, and two bearings of exactly the same size and type are axially connected together and sleeved on the right tail end of the power shaft 200. In order to enable the dual-bearing assembly 300 to stably support the power shaft 200, the two bearings need to ensure that their inner rings are tightly attached to the outer circumference of the tail end of the power shaft 200 after installation. At the same time, the outer rings of the two bearings are tightly attached to the inner wall of the limiting groove 110 of the housing 100. In this way, the dual-bearing assembly 300 can be fixedly installed in the limiting groove 110 and can function stably.
[0042] Of course, in this embodiment, the two bearings are preferably deep groove ball bearings. The specific type of bearings can also be selected according to actual conditions and is not specifically limited herein.
[0043] Furthermore, in order to better fix the dual-bearing assembly 300, a first stop protrusion 210 is also provided at the tail end of the power shaft 200, and the first stop protrusion 210 abuts against the inner ring of the bearing of the dual-bearing assembly 300; a second stop protrusion 111 is provided at the bottom of the limiting groove 110, and the second stop protrusion 111 abuts against the outer ring of the bearing of the dual-bearing assembly 300.
[0044] Specifically, the right tail end of the power shaft 200 is a stepped shaft structure, and the protruding step part is the first stop protrusion 210. The first stop protrusion 210 can just abut the position of the leftmost bearing inner ring of the dual bearing assembly 300. In addition, the height of the first stop protrusion 210 is exactly equivalent to the height of the bearing inner ring; similarly, in order to enable the dual bearing assembly 300 to function normally, the bearing outer ring needs to be fixed. Therefore, at the bottom of the limiting groove 110, that is, the left end of the limiting groove 110, a circle of second stop protrusions 111 is set, and the protruding height of the second stop protrusion 111 is aligned with the protruding height of the first stop protrusion 210, and the second stop protrusion 111 also only acts on the bearing outer ring position on the left side of the dual bearing assembly 300; such a setting can complete the fixation of the left side of the dual bearing assembly 300.
[0045] In this embodiment, the pressure cover 400 has a stepped shaft structure, including a first shaft 410 and a second shaft 420. The diameter of the first shaft 410 is smaller than the diameter of the second shaft 420. A gap is reserved between the end face of the first shaft 410 and the tail end face of the power shaft 200. The outer circumferential surface of the first shaft 410 abuts against the inner wall of the inner ring of the bearing of the dual-bearing assembly 300, and the second shaft 420 abuts against the end of the inner ring of the bearing of the dual-bearing assembly 300.
[0046] Specifically, the pressure cover 400 is a stepped shaft structure, with the first shaft 410 having a smaller diameter and the second shaft 420 having a larger diameter. When the pressure cover 400 is used, the right bearing inner ring of the dual-bearing assembly 300 is fixed by the step surface formed between the first shaft 410 and the second shaft 420; in the installed state, the end face of the first shaft 410 of the pressure cover 400 will dock with the right end face of the power shaft 200, and the second shaft 420 will just be clamped on the end face of the bearing inner ring at the rightmost end of the dual-bearing assembly 300. In this way, as long as the connection between the pressure cover 400 and the power shaft 200 is not loosened, the pressure cover 400 will always limit the axial movement of the dual-bearing assembly 300 to prevent it from moving out of the power shaft 200.
[0047] In order to better install the pressure cover 400, the length of the right tail end of the power shaft 200 will be slightly smaller than the axial length of the dual bearing assembly 300. The space reserved by the difference between the two lengths is just enough to accommodate the first shaft 410.
[0048] On the basis of the above embodiment, in order to be able to install the pressure cover 400 on the power shaft 200, a through hole 430 is provided in the middle part of the pressure cover 400 along its axial direction, and a bolt hole 220 is provided at the corresponding position of the tail end of the power shaft 200. The pressure cover 400 is installed by passing the fixing bolt 600 through the through hole 430 and screwing it into the bolt hole 220.
[0049] Specifically, a through hole 430 is provided on the axis of the gland 400, and a bolt hole 220 is also provided on the axis of the right end of the power shaft 200. With this arrangement, when installing the gland 400, it is only necessary to pass a fixing bolt 600 of appropriate size through the through hole 430 of the gland 400 and thread it into the bolt hole 220. This completes the installation of the gland 400, and the connection is simple, convenient, and stable.
[0050] Furthermore, a countersunk hole 440 for accommodating a bolt head is provided at one end of the through hole 430 away from the power shaft 200 .
[0051] It can be understood that after the pressure cover 400 is installed by the fixing bolt 600, the bolt head of the fixing bolt 600 will protrude from one side of the pressure cover 400. Therefore, in this embodiment, a corresponding countersunk hole 440 is set at the rightmost end of the through hole 430. The depth and diameter of the countersunk hole 440 can be adjusted according to actual conditions. It needs to be able to accommodate the head of the fixing bolt 600. In this way, the bolt head can be prevented from colliding with the end cover 500. In addition, the setting of the countersunk hole 440 is conducive to the positioning and stabilization of the fixing bolt 600.
[0052] In this embodiment, the diameter of the second shaft 420 is larger than the outer diameter of the inner ring of the dual-bearing assembly 300 , and smaller than the inner diameter of the outer ring of the dual-bearing assembly 300 .
[0053] Specifically, in order to fix and limit the inner ring of the bearing at the right end of the dual-bearing assembly 300, the diameter of the second shaft 420 needs to be larger than the inner diameter of the inner ring of the bearing, so as to increase the contact surface between the second shaft 420 and the inner ring of the bearing to achieve a better fixing effect. At the same time, the diameter of the second shaft 420 needs to be smaller than the inner diameter of the outer ring of the bearing, so as to prevent the second shaft 420 from interfering with the outer ring of the bearing.
[0054] In this embodiment, in order to fix the right end of the bearing outer ring of the dual bearing assembly 300 , a corrugated gasket 700 is provided between the end cover 500 and the dual bearing assembly 300 , and the corrugated gasket 700 abuts against the bearing outer ring of the dual bearing assembly 300 .
[0055] It can be understood that a corrugated gasket 700 is arranged between the end cover 500 and the outer ring of the bearing. The corrugated gasket 700 has a certain elasticity. One end of the corrugated gasket 700 will abut against the inner wall of the end cover 500, and the other end will abut against the right end of the outer ring of the bearing. In this way, when the end cover 500 is fixed in place, the outer ring of the bearing will be fixed.
[0056] Furthermore, an adjustment washer 800 is provided between the inner ring of the bearing of the dual-bearing assembly 300 and the first stop protrusion 210 , and the outer ring diameter of the adjustment washer 800 is smaller than the outer diameter of the inner ring of the bearing of the dual-bearing assembly 300 .
[0057] In this embodiment, an adjustment gasket 800 can also be provided between the first stop protrusion 210 and the inner ring of the bearing at the left end of the dual-bearing assembly 300. By changing the thickness of the adjustment gasket 800, the axial position of the dual-bearing assembly 300 on the power shaft 200 can be achieved, and the clearance of the power shaft 200 in the shell can be accurately adjusted to improve the stability of the high-speed operation of the power assembly and the bearing assembly.
[0058] The present invention further provides a pneumatic tool comprising the above-mentioned power bearing assembly. Therefore, the pneumatic tool also has the advantages of the above-mentioned power bearing assembly.
[0059] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.
[0060] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0061] The above is a detailed introduction to the embodiments provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications may be made to the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.
Claims
1. A dynamic bearing assembly, characterized in that: include: A housing (100), wherein a power shaft (200) is provided inside the housing (100), and a limiting groove (110) is provided at the rear end portion of the housing (100); A dual-bearing assembly (300) is sleeved on the rear end of the power shaft (200), and the dual-bearing assembly (300) is located in the limiting groove (110); A pressure cover (400) is detachably mounted on the rear end of the power shaft (200) to limit the axial movement of the dual bearing assembly (300); The end cover (500) is detachably mounted on the rear end of the housing (100).
2. The dynamic bearing assembly according to claim 1, characterized in that: The dual-bearing assembly (300) comprises two bearings arranged in parallel, the inner ring of the bearing of the dual-bearing assembly (300) is sleeved on the outer circumference of the tail end of the power shaft (200), and the outer ring of the bearing of the dual-bearing assembly (300) abuts against the inner wall of the limiting groove (110).
3. The dynamic bearing assembly according to claim 2, characterized in that: The tail end of the power shaft (200) is further provided with a first stop protrusion (210), and the first stop protrusion (210) abuts against the inner ring of the bearing of the dual-bearing assembly (300); A second stop protrusion (111) is provided at the bottom of the limiting groove (110), and the second stop protrusion (111) abuts against the bearing outer ring of the dual-bearing assembly (300).
4. The dynamic bearing assembly according to claim 1, characterized in that: The pressure cover (400) is a stepped shaft structure, comprising a first shaft (410) and a second shaft (420), wherein the diameter of the first shaft (410) is smaller than the diameter of the second shaft (420), a gap is reserved between the end face of the first shaft (410) and the end face of the tail end of the power shaft (200), the outer circumferential surface of the first shaft (410) abuts against the inner wall of the bearing inner ring of the dual-bearing assembly (300), and the second shaft (420) abuts against the end of the bearing inner ring of the dual-bearing assembly (300).
5. The dynamic bearing assembly according to claim 4, characterized in that: A through hole (430) is provided in the middle of the pressure cover (400) along its axial direction, and a bolt hole (220) is provided at a corresponding position of the tail end of the power shaft (200). The pressure cover (400) is installed by screwing a fixing bolt (600) through the through hole (430) into the bolt hole (220).
6. The dynamic bearing assembly according to claim 5, characterized in that: A countersunk hole (440) for accommodating a bolt head is provided at one end of the through hole (430) facing away from the power shaft (200).
7. The dynamic bearing assembly according to claim 4, characterized in that: The diameter of the second shaft (420) is larger than the outer diameter of the bearing inner ring of the dual-bearing assembly (300), and smaller than the inner diameter of the bearing outer ring of the dual-bearing assembly (300).
8. The dynamic bearing assembly according to claim 1, characterized in that: A corrugated gasket (700) is provided between the end cover (500) and the dual-bearing assembly (300), and the corrugated gasket (700) abuts against the bearing outer ring of the dual-bearing assembly (300).
9. The dynamic bearing assembly according to claim 3, characterized in that: An adjustment gasket (800) is provided between the bearing inner ring of the dual-bearing assembly (300) and the first stop protrusion (210), and the outer ring diameter of the adjustment gasket (800) is smaller than the outer diameter of the bearing inner ring of the dual-bearing assembly (300).
10. A pneumatic tool, characterized in that: Comprising the dynamic bearing assembly according to any one of claims 1 to 9.