Lubricating and sealing device for rotary impact electric tool

Abstract

The utility model relates to a lubricating and sealing device for a rotary impact electric tool, and belongs to the technical field of tools. The device comprises an output shaft, the inner end of the output shaft is connected with a rotary impact transmission mechanism, the middle of the output shaft is supported on a sliding bearing fixed to a shell, at least one position of the sliding bearing is provided with a radial hole filled with a micropore oil absorption strip, and the outer end of the sliding bearing is provided with an outer micropore oil absorption ring. An inner micropore oil absorption ring is clamped between the inner end of the sliding bearing and the radial outward extending end face of the inner end of the output shaft, a flexible pad limited in the shell is installed outside the inner micropore oil absorption ring, a central hole of the flexible pad extends inwards in the axial direction to form an annular spigot, and a gasket is sleeved outside the spigot. According to the utility model, multiple obstructions for oil leakage can be formed by virtue of the microporous oil absorption pieces at all positions, so that oil leakage is effectively prevented, and meanwhile, ideal lubrication is ensured between the output shaft and the sliding bearing even in relative movement of rotary impact by virtue of the oil-containing pieces at multiple positions, so that heating abrasion is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of lubricating sealing devices, especially a kind of rotary impact electric tool lubricating sealing device, belong to electric tool technical field. BACKGROUND

[0002] Since Figure 1 The rotary impact electric tool such as impact wrench and the basic structure of traditional electric drill such as rotary electric tool look basically identical, both contain inner end and shell body 4 inner motor transmission mechanism link, outer end is used for installing the output shaft 1 of tool head, the output shaft and the sliding bearing 5 fixed in shell body constitute dynamic cooperation, the outer end of sliding bearing is equipped with sealing ring 6 embedded in shell body, inner end is adjacent to rubber pad 3 located in outer shell, and the radial outer spread end surface of the inner end of output shaft 1 and rubber pad 3 are equipped with gasket 2. However, the transmission mechanism of rotary impact electric tool and traditional rotary electric tool is different, in addition to realizing the rotary transmission of output shaft, it can also drive output shaft to do circumferential (or axial) impact motion as needed, as a result, the rotary impact electric tool derived from traditional rotary electric tool in practice always maintains the original output shaft support sealing structure, so there is lubrication sealing defect, after a period of use, rotary impact (especially axial) motion causes lubricating oil to easily leak from the front end of output shaft, so that the bearing support cooperation place of output shaft is short of oil and heats, and the wear is aggravated. SUMMARY

[0003] The utility model aims at: in view of the above-mentioned prior art existing defect, through structure improvement, propose a kind of rotary impact electric tool lubricating sealing device that can effectively prevent oil leakage and heat wear.

[0004] In order to achieve the above object, the rotary impact electric tool lubricating sealing device of the utility model includes output shaft, the output shaft of inner end and rotary impact transmission mechanism link, the middle part of the output shaft is supported in the sliding bearing fixed in shell body, and its improvement lies in that: at least one radial hole of filling microporous oil absorption strip is made in the sliding bearing, the outer microporous oil absorption ring is equipped on the outer end of the sliding bearing, the inner microporous oil absorption ring is clamped between the inner end of the sliding bearing and the radial outer spread end surface of the inner end of the output shaft, the flexible pad limited in outer shell is equipped outside the inner microporous oil absorption ring, the central hole of the flexible pad extends annular stopper axially, and the stopper is equipped with washer.

[0005] The above-mentioned structure improvement of the utility model can form multiple barriers to oil leakage by means of microporous oil absorption piece everywhere, so as to effectively prevent oil leakage, and multiple oil-containing pieces ensure that the output shaft and the sliding bearing are kept ideal lubrication even in rotary impact relative motion, so heat wear is avoided.

[0006] The further improvement of the utility model is that the outer micro-hole oil absorption ring is sleeved in the groove of the corresponding position of the output shaft in the inner hole, and the outer circle and the two ends are respectively matched with the clearance between adjacent parts.

[0007] The further improvement of the utility model is that the outer end of the outer micro-hole oil absorption ring is buckled on the end cover of the shell.

[0008] The further improvement of the utility model is that the outer circle of the end cover extends outwardly in the axial direction, and the clamping ring is buckled in the clamping groove of the corresponding position of the shell, thereby forming a buckle structure.

[0009] The further improvement of the utility model is that the radial holes of the sliding bearing are filled with micro-hole felt oil absorption strips, and the micro-hole felt oil absorption strips extend to the covered oil filling hole of the corresponding radial hole of the shell. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be further described below with reference to the drawings.

[0011] Figure 1 It is a structural schematic diagram of the prior art.

[0012] Figure 2 It is a structural schematic diagram of the first embodiment of the utility model.

[0013] Figure 3 It is Figure 2 A-A sectional view structure schematic diagram of the embodiment.

[0014] Figure 4 It is Figure 3 B-B sectional view structure schematic diagram.

[0015] Figure 5 It is Figure 2 A-A sectional view structure schematic diagram of the embodiment.

[0016] Figure 6 It is Figure 2 The three-dimensional exploded structure schematic diagram of the embodiment.

[0017] Figure 7 It is a sectional view structure schematic diagram of the second embodiment of the utility model.

[0018] Figure 8 It is Figure 7 The local enlarged structure schematic diagram of the embodiment.

[0019] Figure 9 It is a sectional view structure schematic diagram of the third embodiment of the utility model.

[0020] Figure 10 yes Figure 7 A partially enlarged structural diagram of the embodiment. Detailed Implementation Example 1

[0021] This embodiment is a lubrication and sealing device for an impact wrench, the structure of which is as follows: Figures 1 to 6 As shown, an output shaft 1 with a T-shaped cross-section is connected at its inner end to a motor-driven rotary-impact composite transmission mechanism within the housing 4 (see US Patent Application No. 10,040,178 B2). The output shaft 1 is dynamically fitted with a sliding bearing 5 fixed to the housing, allowing the motor to drive the output shaft to perform intermittent impact rotary motion during use. The sliding bearing 5 has two radial holes filled with microporous felt oil-absorbing strips 7, which extend to the oil filling holes with caps 8 corresponding to the radial holes in the housing 4, allowing for oil filling as needed. An outer microporous felt oil-absorbing ring 6' is fitted at the outer end of the sliding bearing 5 and is embedded within the housing. An inner microporous felt oil-absorbing ring 9 is clamped between the radially outwardly extending end faces of the inner end and the inner end of the output shaft 1. A buffer rubber pad 3' is fitted around the inner microporous oil-absorbing ring 9 and is located within the housing. The central hole of the buffer rubber pad 3' extends axially inward to form an annular stop, which is fitted with a washer 2.

[0022] Experiments show that this embodiment has the following advantages:

[0023] 1. Two layers of oil leakage are formed by arranging inner and outer microporous oil suction rings;

[0024] 2. The output shaft can be lubricated for a long time by setting radial oil suction bars;

[0025] 3. The microporous oil suction component has a lower coefficient of friction with the original rubber component and output shaft, which is more conducive to reducing energy loss;

[0026] 4. Because the microporous oil suction component has a larger compression ratio, it is less sensitive to assembly space than before, and the requirements for the fit dimension chain are reduced, which can reduce processing costs. Example 2

[0027] This implementation example Figure 7 , Figure 8As shown, the basic structure is the same as that of the first embodiment, and the radial hole structure of the micro-porous felt oil absorption strip is not shown due to different section positions. The difference from the first embodiment is that the inner hole of the outer micro-porous felt oil absorption ring 6' is tightly sleeved in the groove at the corresponding position of the output shaft 1, and the outer circle and both ends are respectively matched with the gaps between adjacent parts, so as to rotate with the output shaft during work, thereby helping to reduce the rotating resistance and not easy to wear; in addition, the outer end of the outer micro-porous felt oil absorption ring 6' is provided with a buckle in the end cover 10 of the shell 4, which is more conducive to preventing the exosmosis of lubricating oil. The specific structure of the buckle is that the outer circle of the end cover 10 extends outwardly and inwardly in the axial direction, and the clasp ring is buckled into the clamping groove at the corresponding position of the shell 4, so that the assembly and disassembly are very convenient. Example three

[0028] The present embodiment is Figure 9 , Figure 10 As shown, the basic structure is the same as that of the second embodiment, and the difference is that the outer end of the outer micro-porous felt oil absorption ring 6' is flush with the outer end of the outer shell 4, and the end cover 10 is not required to be installed due to the installation of the outer cover 11 during use.

[0029] In addition to the above embodiments, the utility model can also have other implementation manners, for example, applied to impact drills, rotary hammer tools (commonly known as electric hammers) and the like. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A rotary percussion electric tool lubrication seal device comprising an output shaft having an inner end connected to a rotary percussion transmission mechanism, and a middle part supported by a sliding bearing fixed to a housing, characterized in that: The sliding bearing is provided with radial holes filled with micro-porous oil absorption strips at least one place, the outer end of the sliding bearing is provided with an outer micro-porous oil absorption ring, the inner end of the sliding bearing and the radially outwardly extending end face of the inner end of the output shaft are clamped with an inner micro-porous oil absorption ring, the outer end of the inner micro-porous oil absorption ring is provided with a flexible pad limited in the outer shell, the central hole of the flexible pad extends axially inwardly to an annular stopper, and the stopper is sleeved with a washer.

2. The rotary impact power tool lubricating seal device according to claim 1, characterized by: The inner hole of the outer micro-porous oil absorption ring is tightly sleeved in the groove at the corresponding position of the output shaft, and the outer circle and the two ends are respectively matched with the gaps between adjacent parts.

3. The rotary impact power tool lubricating seal device according to claim 1 or 2, characterized in that: The outer end of the outer micro-porous oil absorption ring is provided with a buckle sleeved on the end cover of the shell.

4. The rotary impact power tool lubricating seal device according to claim 3, characterized by: The outer circle of the end cover extends axially inwardly to an outwardly turned clamping ring, the clamping ring is clamped in the clamping groove at the corresponding position of the shell to form a buckle structure.

5. The rotary impact power tool lubricating seal apparatus according to claim 4, characterized by: The sliding bearing is provided with radial holes filled with micro-porous oil absorption strips at two places, and the micro-porous oil absorption strips extend to the covered oil filling holes at the corresponding radial holes of the shell.

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