CN102101281B - Power tool - Google Patents

Abstract

The invention discloses a power tool. The power tool comprises a motor, a motor shaft, a retarding box and a middle shaft, wherein the motor shaft is connected with the motor; the retarding box is used for transmitting power; the middle shaft is positioned in the retarding box; the retarding box comprises a retarding box shell and a middle cover structure which is connected with the retarding box shell; a first gear is arranged on the motor shaft; a second gear is arranged on the middle shaft; the first gear and the second gear are meshed to form a meshed part; the middle cover structure is also provided with a seal part; and the meshed part is positioned in the seal part. In the power tool, a lubricating agent positioned in the meshing part is not reduced as the lubricating agent splashes to the outer side of the seal part, so that the lubricating effect of the meshed part can be kept.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, particularly a kind of power tool with reduction box.

Background technology

Usually have a housing such as power tools such as electric hammers at present, a motor is installed in the housing, produce power behind the motor starting, working head is positioned at the front end of power tool, carries out work in every.In addition, also have a reduction box organizations in the housing of power tool, the driving force that motor produces passes to foremost working head by reducing gear, makes power tool work.

Disclosed a kind of electric hammer Chinese patent CN96233491.X number, be provided with reducing gear in the reduction box that is limited by the electric hammer shell, and have the transmission mechanism that comprises jackshaft.Motor has motor drive shaft, has respectively corresponding gear on motor drive shaft and the jackshaft, intermeshing so that motor shaft is connected with jackshaft between the gear, the other end of jackshaft is connected with output again, the engagement of jackshaft and motor drive shaft passes to output with power from motor like this, thereby output shaft is connected the motion of drive working head again with working head.

Yet in the situation that the motor high speed rotating, the gear of joggleword often weares and teares than comparatively fast; rub for reducing between gear; keep between gear engagement closely and the efficient of work, usually can between gear, add lubricating oil, to reduce wear and tear in machines and to increase durability.But, in actual applications, be filled in lubricating oil between gear often in the High Rotation Speed of gear, because centrifugal action breaks away from gear, be splashed on the shell of reduction box, even ooze out the shell of reduction box.The leakage of lubricant can cause the quality of product and durability to be degenerated, and can pollute, also can cause simultaneously a large amount of minimizings of lubricant between gear, gear be can not get lubricated fully, lubricant effect reduces greatly, has reduced the operating efficiency of whole electric tool.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of power tool with the reduction box that prevents lubricating oil splash.

The present invention solves the technical scheme that the prior art problem adopts: a kind of power tool, comprise a motor, one connects the motor drive shaft of described motor, one is used for the reduction box of transmission power, one is positioned at the jackshaft of reduction box, reduction box comprises that reduction box casing and connects the middle cover structure of reduction box casing, motor drive shaft is provided with the first gear, jackshaft is provided with the second gear, the first gear and the engagement of the second gear form engaging piece, the middle cover structure also has a sealing, and engaging piece is positioned at sealing.

Further, the cylindrical structure of sealing comprises base plate and to the sidewall of base plate one side projection.

Again further, base plate also has a blind hole, and blind hole has a peristome and a bottom.

Again further, opening is in the sidewall opposite side of base plate.

Again further, sidewall has a breach, and the bottom of blind hole is communicated with the breach of sidewall.

Again further, the first gear passes peristome and is contained in the blind hole.

Again further, the second gear is positioned at sealing.

Again further, middle cover structure and reduction box casing are one-body molded.

Again further, the middle cover structure is screwed mode with reduction box casing and is connected.

Compared with prior art, beneficial effect of the present invention is: the engaging piece that gear forms is positioned at the sealing of middle cover structure, prevents that the lubricant that is positioned at engaging piece from reducing because being splashed to outside the sealing, thereby improves the lubricant effect of gear engaging piece.

Description of drawings

Above-described purpose of the present invention, technical scheme and beneficial effect can by the following detailed description that can realize specific embodiments of the invention, be described and clearly acquisition simultaneously by reference to the accompanying drawings.

Identical label in accompanying drawing and the specification is used for representing element identical or that be equal to symbol.

Fig. 1 is the schematic diagram of power tool one better embodiment of the present invention.

Fig. 2 is the three-dimensional exploded view of power tool shown in Figure 1.

Fig. 3 is the three-dimensional exploded view at another visual angle of power tool shown in Figure 1.

Fig. 4 is the schematic diagram of the middle cover structure of power tool shown in Figure 1.

1, power tool 2, handle portion 3, motor shell

4, reduction box casing 5, motor 51, motor drive shaft

52, the first gear 6, middle cover structure 7, reduction box

8, jackshaft 8, the second gear 10, base plate

11, locating hole 14, blind hole 141, peristome

142, bottom 15, sealing 151, sidewall

152, opening 153, breach 154, engaging piece

The specific embodiment

About detailed description of the present invention and technology contents, cooperate description of drawings as follows, yet appended accompanying drawing only provide reference and explanation, and the present invention is limited.

With reference to shown in Figure 1, the housing of the power tool 1 of the present invention's one better embodiment comprises handle 2, motor shell 3 and reduction box casing 4.Handle 2 is used for holding tool, and a switch is installed on handle 2, is used for starting power tool.Motor shell 3 is connected with handle 2, and in this preferred embodiment, handle 2 and motor shell 3 are one-body molded by plastic material, and other kinds can also be arranged.Be contained in motor 5 in the motor shell 3 for generation of power, motor 5 has a motor drive shaft 51 that is used for transmission power.One end connecting motor 5 of motor drive shaft 51 has the first gear 52 on the other end of motor drive shaft.

Reduction box 7 is arranged on the front portion of power tool 1.Reduction box 7 comprises reduction box casing 4 and is connected in the middle cover structure 6 of reduction box casing.Middle cover structure 6 is arranged at the centre of reduction box casing 4 and motor shell 3.Reduction box 7 mainly plays transferring power, and motor 5 produces power and passes to the working head of power tool 1 front portion through reduction box 7.

As shown in Figure 2, have a jackshaft 8 in the inside of reduction box 7, jackshaft 8 plays transferring power.The axis of jackshaft 8 is parallel to the axis of motor drive shaft 51, but the axle center of jackshaft 8 do not overlap with the axle center of motor drive shaft 51, jackshaft 8 by being positioned at its two ends bearings and can be rotated around the axis of jackshaft 8.One end of jackshaft 8 has the second gear 81, and the first gear 52 and the second gear 81 on the jackshaft 8 on the motor drive shaft 51 can be intermeshing, thereby so that power can pass to jackshaft 8 from motor drive shaft 51.

Shown in Fig. 2-4, the middle cover structure 6 of reduction box 7 mainly comprises a base plate 10.In this preferred embodiment, base plate 10 is a circular configuration, has several locating holes 11 in the edge of base plate 10, and screw can pass those locating holes 11 middle cover structure 6 is fixedly connected with gear casing 4.Certainly the middle cover structure is not limited to this with being connected of reduction box casing, and for example, middle cover structure 6 is one-body molded with reduction box casing.

Be defined as respectively the first side and the second relative side in the both sides of base plate 10.Base plate 10 is the first side away from a side of motor 5, and a side of base plate 10 contiguous motors 5 is the second side, and reduction box major part and working head all are positioned at the first side, and motor 5 and motor drive shaft 51 are positioned at the second side.

Centre at base plate 10 has a blind hole 14, and blind hole 14 has a peristome 141 and a bottom 142.The peristome 141 of blind hole 14 is positioned at the second side of base plate 10, and 142 of bottoms are positioned at the first side of base plate 10, can say that also blind hole 14 passed base plate 10, and its peristome 141 and bottom 142 lay respectively at the both sides of base plate 10.Motor drive shaft 51 is fixedly connected with the first gear 52, the first gears 52 can be around the axis rotation of motor drive shaft 41.52 of peristome 141, the first gears that motor drive shaft 51 partly passes blind hole 14 pass peristome 141 and are contained in the bottom 142 of blind hole 14.

Also has sealing 15 on the base plate 10 of middle cover structure 6.Sealing 15 is positioned at the first side 12 of base plate 10, and bottom 142 adjacency of sealing 15 and blind hole 14.In this preferred embodiment, sealing 15 is cylindrical structure roughly, yet the present invention is not limited to this, in other embodiments, cylindricality, taper, square, the structures such as circle all can.Sealing 15 comprises and is positioned at its base plate 10, and base plate 10 is positioned at the bottom of sealing 15, the sidewall 151 and the opening 152 that protrude from base plate 10 and extend to the first side 12, and opening 152 is positioned at the top of sealing 15.Jackshaft 8 partly passes opening 152, and the second gear 81 on the jackshaft 8 then passes opening and is contained in sealing 15.Sidewall 151 in sealing 15 and bottom 142 adjacency of blind hole 14 has a breach 153, and breach 153 spatially is communicated with the bottom 142 of blind hole 14, such the first gear 52 and the second gear 81 can mesh, and the engaging piece 154 of its intermeshing formation is positioned at sealing 15.Add lubricating oil at engaging piece 154, in the high-speed gear rotation, can not sputter sealing 15, the lubricating oil oil mass of engaging piece 154 can not reduced, thereby make engaging piece 154 remain good lubricant effect.

Claims (8)

1. a power tool (1), comprise a motor (5), one connects the motor drive shaft (51) of described motor (5), one is used for the reduction box (7) of transmission power, one is positioned at the jackshaft (8) of described reduction box (7), reduction box (7) comprises that reduction box casing (4) and connects the middle cover structure (6) of described reduction box casing (4), described motor drive shaft (51) is provided with the first gear (52), described jackshaft (8) is provided with the second gear (81), described the first gear (52) forms engaging piece (154) with described the second gear (81) engagement, it is characterized in that: described middle cover structure (6) also has a sealing (15), described engaging piece (154) is positioned at described sealing (15), the cylindrical structure of described sealing (15) comprises base plate (10) and to the sidewall (151) of described base plate (10) one side projections.

2. power tool according to claim 1, it is characterized in that: described base plate (10) also has a blind hole (14), and described blind hole (14) has a peristome (141) and a bottom (142).

3. power tool according to claim 2, it is characterized in that: described peristome (141) is positioned at the opposite side of the sidewall (151) of described base plate (10).

4. power tool according to claim 2, it is characterized in that: described sidewall (151) has a breach (153), and the bottom (142) of described blind hole (14) is communicated with the breach (153) of described sidewall (151).

5. power tool according to claim 2, it is characterized in that: described the first gear (52) passes described peristome (141) and is contained in the described blind hole (14).

6. power tool according to claim 1, it is characterized in that: described the second gear (52) is positioned at described sealing (15).

7. power tool according to claim 1 is characterized in that: described middle cover structure (6) is one-body molded with described reduction box casing (4).

8. power tool according to claim 1, it is characterized in that: described middle cover structure (6) is connected with described reduction box casing (4) mode of being screwed.

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