Polisher

Abstract

A polishing machine, comprising a housing, an output shaft, a first bearing and an oil-impregnated wool felt ring. The housing comprises a housing body and a front cover connected with the front end of the housing body and defining a cavity together, the front cover has an end wall with a shaft hole; the top end of the output shaft is rotatably installed on the housing body, and the bottom end of the output shaft extends out of the cavity through the shaft hole of the end wall. The back surface of the end wall of the front cover is provided with a protruding annular column surrounding the output shaft; the oil-impregnated wool felt ring and the first bearing are arranged in the cavity and respectively sleeved on the outside of the output shaft, the outer circumferential surface of the oil-impregnated wool felt ring and the outer circumferential surface of the first bearing respectively abut the hole wall of the central hole of the annular column, and the front end surface and the rear end surface of the oil-impregnated wool felt ring respectively abut the back surface of the end wall of the front cover and the front end surface of the first bearing. The polishing machine has good dustproof effect of the output shaft bearing.

Description

Technical Field

[0001] This utility model relates to power tools, and more particularly to polishing machines. Background Technology

[0002] Most existing polishing machines use thin iron sheets to prevent dust from entering the bearings of the gearbox output shaft. However, the dust prevention effect of the bearings is not ideal. During use, a lot of dust still enters the bearings, which shortens the bearing life and may even cause the machine to stop.

[0003] In addition, the gearbox of existing polishing machines has a large internal space, requiring a large amount of semi-solid lubricating grease to lubricate the gears to ensure that the gears are lubricated during operation. However, after continuous operation, there is still a problem of severe gear wear. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a polishing machine with good dust prevention effect on the output shaft bearing.

[0005] Another technical problem to be solved by this utility model is to provide a polishing machine that can fully lubricate gears during polishing machine operation.

[0006] The polishing machine of this utility model embodiment includes a housing, an output shaft, and a first bearing. The housing includes a housing body and a front cover. The front cover is connected to the front end of the housing body and together defines a chamber. The front cover has an end wall with a shaft hole. The top end of the output shaft is rotatably mounted on the housing body, and the bottom end of the output shaft passes through the shaft hole in the end wall and extends out of the chamber. The characteristic is that the back side of the end wall of the front cover has a protruding annular column that surrounds the output shaft. The polishing machine also includes an oil-impregnated wool felt ring. The oil-impregnated wool felt ring and the first bearing are disposed in the chamber and respectively sleeved on the outside of the output shaft. The outer peripheral surface of the oil-impregnated wool felt ring and the outer peripheral surface of the first bearing respectively abut the wall of the central hole of the annular column. The front end face and the rear end face of the oil-impregnated wool felt ring abut the back side of the end wall of the front cover and the front end face of the first bearing respectively.

[0007] Preferably, the outer circumferential surface of the oil-impregnated wool felt ring is interference-fitted with the wall of the central hole of the annular column, and the front and rear ends of the oil-impregnated wool felt ring are interference-fitted with the back end wall of the front cover and the front end face of the first bearing, respectively.

[0008] Preferably, the polishing machine includes a front cover dustproof plate with a perforation and an annular flange extending behind the front cover dustproof plate from the periphery of the perforation; the front cover dustproof plate is positioned in front of the front cover, and the annular flange extends into a shaft hole in the end wall of the front cover; the output shaft passes through the perforation of the front cover dustproof plate, and an annular step is provided on the side of the output shaft, which abuts against the front end face of the front cover dustproof plate.

[0009] Preferably, the polishing machine includes a driving bevel gear, a driven bevel gear, and an oil guide ring; the driving bevel gear and the driven bevel gear are meshed together, and the driven bevel gear is sleeved outside the output shaft to drive the output shaft to rotate synchronously; the oil guide ring includes a ring body, multiple oil guide vanes, and an oil guide cover; the ring body is fixed in a chamber, and the bottom surface of the ring body is spaced apart from the top surface of the driven bevel gear, and the multiple oil guide vanes are disposed on the bottom surface of the ring body; one end of the oil guide cover is connected to the ring body, and the oil guide cover covers the driving bevel gear; the multiple oil guide vanes are configured to guide the lubricating grease between the bottom surface of the ring body and the top surface of the driven bevel gear into the interior of the oil guide cover when the polishing machine is working.

[0010] This utility model has at least the following advantages:

[0011] 1. In this embodiment of the utility model, the outer peripheral surface of the oil-impregnated wool felt ring abuts against the wall of the central hole of the annular column, and the front and rear surfaces of the oil-impregnated wool felt ring abut against the back side of the end wall of the front cover and the front surface of the first bearing, respectively, forming a seal against the gaps that enter the bearing from the outside, improving the dustproof effect of the bearing, reducing the risk of bearing damage, and extending the service life of the bearing.

[0012] 2. In this embodiment of the utility model, when the active bevel gear drives the driven bevel gear to rotate to perform polishing work, the multiple oil guide blades of the oil guide ring can guide the lubricating grease between the bottom surface of the oil guide ring and the top surface of the driven bevel gear into the interior of the oil guide cover, so that the contact working parts of the active bevel gear and the driven bevel gear are fully lubricated, thereby reducing gear wear, extending gear service life, and reducing the use of lubricating grease, achieving economic and environmental protection effects. Attached Figure Description

[0013] Figure 1 An exploded view of a polishing machine according to an embodiment of the present invention is shown.

[0014] Figure 2 and Figure 3 Cross-sectional schematic diagrams of a polishing machine according to an embodiment of the present invention are shown from different angles.

[0015] Figure 4 and Figure 5 A perspective view and a bottom view of an oil guide ring according to an embodiment of the present invention are shown respectively.

[0016] Figure 6 A cross-sectional schematic diagram of an oil guide ring according to an embodiment of the present invention is shown.

[0017] Figure 7 A front view schematic diagram of an oil guide vane according to an embodiment of the present invention is shown. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] Please refer to Figures 1 to 3 A polishing machine according to an embodiment of the present invention includes a housing 1, a motor 2, a driving bevel gear 31, a driven bevel gear 32, an output shaft 4, a first bearing 51, a second bearing 52, an oil-soaked wool felt ring 61, a retaining ring 62, and an oil guide ring 7.

[0020] The housing 1 includes a housing body 1a and a front cover 1b. The front cover 1b is connected to the front end of the housing body 1a and together defines a chamber 10. The front cover 1b and the front end of the housing body 1a together constitute the gearbox of the polishing machine. In this embodiment, the front cover 1b is connected to the front end of the housing body 1a by multiple screws 91.

[0021] The front cover 1b has an end wall 11, and the end wall 11 has a shaft hole 110. The bottom end of the output shaft 4 passes through the shaft hole 110 of the end wall 11 and extends out of the chamber 10.

[0022] The back of the end wall 11 of the front cover has a raised annular post 111, which surrounds the output shaft 4. An oil-impregnated wool felt ring 61 and a first bearing 51 are disposed in the chamber 10 and respectively fitted around the output shaft 4. The outer circumferential surfaces of the oil-impregnated wool felt ring 61 and the first bearing 51 respectively abut against the wall of the central hole 1110 of the annular post 111. The outer circumferential surface of the oil-impregnated wool felt ring 61 is press-fitted with the wall of the central hole 1110 of the annular post 111. The front and rear ends of the oil-impregnated wool felt ring 61 abut against the back of the end wall 11 of the front cover and the front end of the first bearing 51 respectively, and are press-fitted with the back of the end wall 11 of the front cover and the front end of the first bearing 51 respectively. The oil-impregnated wool felt ring 61 forms a seal against any gaps entering the bearing from the outside, greatly reducing the risk of bearing damage to the polishing machine's output shaft. The second bearing 52 is installed on the housing body 1a and sleeved on the top end of the output shaft 4 so that the top end of the output shaft 4 is rotatably installed on the housing body 1a.

[0023] In this embodiment, the central hole 1110 of the annular post 111 is a stepped hole, which includes a large hole 1111 with a larger diameter and a small hole 1112 with a smaller diameter. The outer peripheral surface of the oil-soaked wool felt ring 61 abuts against the hole wall of the small hole 1112, and the outer peripheral surface of the first bearing 51 abuts against the hole wall of the large hole 1111.

[0024] The retaining ring 62 is sleeved on the output shaft 4 and detachably connected to the front cover 1b by multiple fasteners 92. The front end face of the retaining ring 62 abuts against the top surface of the annular column 111 and the rear end face of the first bearing 51, respectively, and plays a role in axially limiting the first bearing 51. Optionally, the fasteners 92 mentioned above are screws.

[0025] Preferably, the polishing machine in this embodiment also includes a front cover dustproof plate 63. The front cover dustproof plate 63 has a through hole 630, and an annular flange 631 extending rearward from the periphery of the through hole 630. The front cover dustproof plate 63 is positioned in front of the front cover 1b, and the annular flange 631 extends into the shaft hole 110 of the front cover end wall 11. The output shaft 4 passes through the through hole 630 of the front cover dustproof plate 63, and an annular step 41 is provided on the side of the output shaft 4. The annular step 41 abuts against the front end face of the front cover dustproof plate 63, thereby preventing the front cover dustproof plate 63 from falling off. The front cover dustproof plate 63 further prevents external dust from entering the chamber 10, improving the dustproof effect.

[0026] The output end of motor 2 is connected to the driving bevel gear 31 to drive the driving bevel gear 31 to rotate. The driving bevel gear 31 is meshed with the driven bevel gear 32, which is sleeved on the outside of the output shaft 4 to drive the output shaft 4 to rotate synchronously.

[0027] Please refer to Figures 4 to 6 The oil guide ring 7 includes a ring body 7a, multiple oil guide vanes 7b, and an oil guide cover 7c. The ring body 7a is fixed in the chamber 10, with its bottom surface spaced apart from the top surface of the driven bevel gear 32. Multiple oil guide vanes 7b are disposed on the bottom surface of the ring body 7a. One end of the oil guide cover 7c is connected to the ring body 7a, and the oil guide cover 7c covers the driving bevel gear 31. The multiple oil guide vanes 7b are configured to guide the lubricating grease between the bottom surface of the ring body and the top surface of the driven bevel gear into the interior of the oil guide cover 7c when the polishing machine is working (i.e., when the driving bevel gear 31 drives the driven bevel gear 32 to rotate synchronously to perform polishing work). This ensures sufficient lubrication of the contact areas between the driving bevel gear 31 and the driven bevel gear 32, thereby reducing gear wear.

[0028] In this embodiment, each oil guide blade 7b extends in an arc shape in the radial direction, and the height of the oil guide blade 7b gradually decreases from one end of the oil guide blade near the edge of the ring body 7a to the other end of the oil guide blade near the central hole 70 of the ring body along the extension direction of the oil guide blade 7b.

[0029] In this embodiment, the bottom surface of the ring 7a is provided with a downwardly protruding annular hub portion 71, which surrounds the central hole 70 of the ring 7a; one end of each oil guide blade 7b is adjacent to the edge of the ring 7a, and the other end of each oil guide blade 7b abuts against the annular hub portion 71. Figure 7 As shown, the height of one end of the oil guide blade 7b near the edge of the ring body 7a is h1, and the height of the other end of the oil guide blade 7b abutting against the annular hub portion 71 (i.e. the other end near the central hole 70 of the ring body) is h2, where h1 is greater than h2.

[0030] In this embodiment, the bottom surface of the ring 7a is provided with a pair of downwardly extending legs 72, which are connected to the front cover 1b to fix the ring 7a in the chamber 10. More specifically, each leg 72 is an arc-shaped leg, and the cover 1b is provided with an annular protrusion 12. The pair of legs 72 are sleeved on the annular protrusion 12 and are interference-fitted with the annular protrusion 12.

[0031] In this embodiment, the ring 7a is C-shaped and has a notch 73. The oil guide cover 7c includes an arc-shaped cover 77 and a pair of sidewalls 78. The arc-shaped cover 77 covers the notch 73, and the pair of sidewalls 78 are respectively connected to the two sides of the arc-shaped cover 77 extending out of the ring 7a. In the example shown in the figure, the sidewall 78 is L-shaped, with one side of the L-shaped sidewall connected to the ring 7a and the other side of the L-shaped sidewall connected to the arc-shaped cover 77.

[0032] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A polishing machine, comprising a housing, an output shaft, and a first bearing; the housing comprising a housing body and a front cover, the front cover being connected to the front end of the housing body and together defining a chamber, the front cover having an end wall, the end wall having a shaft hole; the top end of the output shaft being rotatably mounted to the housing body, the bottom end of the output shaft passing through the shaft hole in the end wall and extending out of the chamber, characterized in that, The back of the end wall of the front cover is provided with a protruding annular post, which surrounds the output shaft; The polishing machine also includes an oil-impregnated wool felt ring; the oil-impregnated wool felt ring and the first bearing are disposed in the chamber and respectively sleeved on the output shaft, the outer peripheral surface of the oil-impregnated wool felt ring and the outer peripheral surface of the first bearing respectively abut against the wall of the central hole of the annular column, the front end face and the rear end face of the oil-impregnated wool felt ring respectively abut against the back side of the end wall of the front cover and the front end face of the first bearing.

2. The polishing machine as described in claim 1, characterized in that, The central hole of the annular column is a stepped hole, which includes a large hole with a larger diameter and a small hole with a smaller diameter. The outer peripheral surface of the oil-impregnated wool felt ring abuts against the wall of the small hole, and the outer peripheral surface of the first bearing abuts against the wall of the large hole.

3. The polishing machine as described in claim 1 or 2, characterized in that, The outer circumferential surface of the oil-impregnated wool felt ring is interference-fitted with the wall of the central hole of the annular column, and the front and rear ends of the oil-impregnated wool felt ring are interference-fitted with the back end wall of the front cover and the front end face of the first bearing, respectively.

4. The polishing machine as described in claim 1 or 2, characterized in that, The polishing machine includes a front cover dustproof plate, which has a perforation and an annular flange extending behind the front cover dustproof plate around the periphery of the perforation; the front cover dustproof plate is located in front of the front cover, and the annular flange extends into a shaft hole in the end wall of the front cover. The output shaft passes through the perforation of the front cover dustproof plate, and an annular step is provided on the side of the output shaft, which abuts against the front end face of the front cover dustproof plate.

5. The polishing machine as described in claim 1, characterized in that, The polishing machine includes a second bearing, which is installed on the housing body and sleeved on the top end of the output shaft.

6. The polishing machine as described in claim 1, characterized in that, The polishing machine includes a driving bevel gear, a driven bevel gear, and an oil guide ring; The driving bevel gear meshes with the driven bevel gear, and the driven bevel gear is sleeved outside the output shaft to drive the output shaft to rotate synchronously; The oil guide ring includes a ring body, multiple oil guide vanes, and an oil guide cover; the ring body is fixed in the chamber, and the bottom surface of the ring body is spaced apart from the top surface of the driven bevel gear, and the multiple oil guide vanes are disposed on the bottom surface of the ring body; one end of the oil guide cover is connected to the ring body, and the oil guide cover covers the driving bevel gear; the multiple oil guide vanes are configured to guide the lubricating grease between the bottom surface of the ring body and the top surface of the driven bevel gear into the interior of the oil guide cover when the polishing machine is working.

7. The polishing machine as described in claim 6, characterized in that, Each of the oil guide blades extends in an arc shape in the radial direction, and the height of the oil guide blade gradually decreases from one end of the oil guide blade near the edge of the ring to the other end of the oil guide blade near the central hole of the ring along the extension direction of the oil guide blade.

8. The polishing machine as described in claim 7, characterized in that, The bottom surface of the ring body is provided with a downwardly protruding annular hub portion, which surrounds the central hole of the ring body; One end of each of the oil guide vanes is adjacent to the edge of the ring body, and the other end of each of the oil guide vanes abuts against the annular hub.

9. The polishing machine as described in claim 6, characterized in that, The bottom surface of the ring is provided with a pair of downwardly extending legs, which are connected to the front cover.

10. The polishing machine according to any one of claims 6 to 9, characterized in that, The ring is C-shaped and has a notch; The oil guide cover includes an arc-shaped cover body and a pair of sidewalls. The arc-shaped cover body covers the notch, and the pair of sidewalls are respectively connected to the two sides of the arc-shaped cover body that extends out of the ring body.

Images