CN101001719A

CN101001719A - Electric tool

Info

Publication number: CN101001719A
Application number: CNA2005800273686A
Authority: CN
Inventors: 安东·林斯; 克莱门斯·穆勒
Original assignee: Kress Elektrik GmbH and Co Elektromotorenfabrik
Current assignee: Kress Elektrik GmbH and Co Elektromotorenfabrik
Priority date: 2004-07-23
Filing date: 2005-07-21
Publication date: 2007-07-18
Also published as: EP1771278A1; DE202004011614U1; RU2007106891A; WO2006010361A1

Abstract

The invention relates to an electric tool comprising: a drive device (420); an output shaft (200) that transmits a rotatory force of the drive device (420), and a gear wheel that is clearance fitted with the output shaft (200). The output shaft (200), on the side of the gear wheel, and an opening (315; 325) of the gear wheel (300) that receives the output shaft each have contours, which are adapted to one another, cause the output shaft (200) to be rotationally driven by the rotation of the gear wheel (300), and which intermesh with a predefinable amount of clearance.

Description

Electric tool

Technical field

The present invention relates to a kind of electric tool, be furnished with a drive unit; An output shaft, the steering force of transmission drive unit; With a gear, this gear cooperates with output shaft clearance.

Eccentricity, speed changer axial deviation, speed changer adjustment or engagement tolerance by gear, existing this type electric tool, when the flank of tooth of the gear on the power transmission shaft that is engaged on drive unit touches the flank of tooth of gear of power transmission shaft self, collision often appears, this can cause the gear vibration of output shaft one side, and causes the vibration of output shaft.So, not only aggravate the wearing and tearing of gear, and also caused unwelcome noise.Especially when startup or high loaded process, because the torsional moment of power transmission shaft side is very big, noise is also very big.

In order to eliminate this noise, the electric tool that comes from DE 101 38 076 A1 has designed a gear mechanism structure, the Wedge device that the transmission strength that a highstrenghtpiston makes is arranged between the output shaft side of output shaft and gear in this mechanism has corresponding wedge groove flat or V-type and this Wedge device that transmits strength to match on output shaft and gear.Tangential direction design is gapped between gear and output shaft, the gap that is also formed by feather key or disc spring between plastics Wedge device and the output shaft.

US 5,829, and what describe in 306 is another form of this type electric tool, promptly leaves the gap between output shaft and crown gear.Here also use the plastics Wedge device, be contained in the gap, and play the effect that turns to stop.Crown gear is fixed on the axle by a plastic sheet and a flexible member.

In above two kinds of instruments,, a plastics Wedge device is installed between output shaft and gear or crown gear is bothered very much though obtained obvious effects to reducing noise.Itself also can wearing and tearing of plastics Wedge device in addition, especially under the duty of high load capacity, can shorten the service life of electric tool.

The objective of the invention is, the electric tool that beginning is mentioned for this paper carries out deep design, makes its structure simpler, and can reduce noise, and do not re-use the plastics Wedge device that preamble is mentioned.

Summary of the invention

This programme has been finished the regulation of claim 1.

Basic concept of the present invention is that the design of the opening part that not only gear side of output shaft, and gear and output shaft cooperate will match, and drives the rotation of output shaft by the rotation of gear, and can preestablish the gap by the outline line of adjusting both.By the cooperation of output shaft and the intermeshing gapped outline line of gear opening part, can in rotation, reduce wearing and tearing, and significantly reduce noise simultaneously.This electric tool work is quiet and durable, for example can reduce the loss of polishing dish in milling tools.

In theory, the mode of outline line by the most different transmissions can be designed.

Find that under a very desirable form profile is the connection of a polygonal oblique crank Z.

Rationalistic discussion makes us consider the connection of polygonal oblique crank Z.The polygonal oblique crank Z ways of connecting of most being convenient to produce is exactly the triangular section bar.

Find that under another comparatively desirable form profile is that profile of tooth or wedge shape axle connect.

Connect for the wedge shape axle, pay the utmost attention to straight sided and center symmetry.

It can be the serration channel section that toothed shank connects.

Description of drawings

By following accompanying drawing according to multi-form requirement design, deep description the present invention further embodies feature of the present invention and advantage.

Accompanying drawing is respectively:

Fig. 1: be the design section figure of first kind of substantive requirements of form of the electric tool of invention use;

The diagram of the output shaft that relates in the electric tool of Fig. 2: Fig. 1;

Fig. 3: the gear side vertical view of output shaft;

The diagram of the polygonal oblique crank Z section bar of the output shaft that Fig. 4: Fig. 1 to Fig. 3 represents;

Fig. 5: the vertical view that is fixed on the gear on the output shaft that relates in Fig. 1 electric tool;

Fig. 6: the design section figure for the another kind of substantive requirements of form of the electric tool of invention use, removed drive unit;

The diagram of the output shaft that relates in the electric tool of Fig. 7: Fig. 6;

Fig. 8: the gear side vertical view of output shaft;

Fig. 9: Fig. 6 to Fig. 8 represents the diagram of the wedge shape axle section bar of output shaft;

Figure 10: the vertical view that is fixed on the gear on the output shaft that relates in Fig. 6 electric tool.

The specific embodiment

In the shell 100 of electric tool, angle grinding machine for example shown in Figure 1, by the fixing output shaft 200 of bearing 110,120, its end portion of stretching out shell 100 is with screw rod 210 fixing for example polishing dishes (not drawing on the figure).Also having a gear 300 on output shaft 200, for example be crown gear, and be fixed together gapped with it can be further described below mode of fixing, and the rotation of gear 300 is delivered on the output shaft 210 like this.

On the gear 300 that occurs with the crown gear form bevel pinion 400 is arranged, by driver element 420, for example the axle 410 by electro-motor 420 drives it.Axle 410 is fixing by bearing 440 in the enclosure.A ventilation gear 415 can be installed on axle 410, be used for the ventilation of electro-motor 420, also be simultaneously that the gear train that bevel pinion 400 and gear 300 are formed ventilates.

The profile of the gear side end of output shaft 200 is triangular parts 215, itself and be meshed by predetermined gap by the output shaft opening 315 of its design fully, make the rotation of gear 300 drive the rotation of output shaft 200 (please comparison diagram 2 to Fig. 5).By the gap that various measurements are determined, noise reduces as much as possible when having guaranteed the electric tool running.Certainly, the present invention not only is confined to use the triangular part, and various gapped polygonal oblique crank Zs connect and can design.

In the form example of another that in Fig. 6 to Figure 10, represent by the electric tool of the present invention's design, used and identical from Fig. 1 to Fig. 5 or corresponding parts, also used identical title, like this can be consistent with the description and the notion of preamble.

Be that the example in Fig. 6 to Figure 10 do not use polygonal oblique crank Z to connect between output shaft 200 and gear 300, but the wedge shape axle connects accordingly with the example among Fig. 1 to Fig. 5.The gear side end of output shaft 200 is a wedge shape axle section bar 225, is meshed with the opening 325 of the gear 300 that matches with wedge shape axle section bar 225 that predetermined gap arranged.The wedge shape axle of this structure connects the preferential straight sided and centrosymmetric of selecting, and is low and wear and tear little at the noise in service of electric tool like this.

Except connecting, the wedge shape axle also can connect with gear shaft.For example can use the corresponding opening of bevel pinion profile on a bevel pinion and the gear 300 to be meshed on the output shaft 200.

Aforesaid invention has very large superiority, can be so that gear 300 need other parts to be connected with output shaft 200, and the effect of the stop of turning to arranged, connect by the aforesaid polygonal oblique crank Z that uses symmetric arrays, or gear and the connection of wedge shape axle, guaranteed that not only output shaft 200 is driven smoothly by gear 300, and obviously reduced operating noise and loss.

Claims

1. an electric tool comprises a drive unit (420); An output shaft (200) transmits the steering force of drive unit (420); Be furnished with a gear, this gear and output shaft (200) matched in clearance is characterized in that, an opening (315 on the gear side of output shaft (200) and the gear (300); 325) profile phase cooperates, and drives the rotation of output shaft (200) by the rotation of gear (300), can come the adjusting play by the profile that adjustment matches.

2. electric tool according to claim 1 is characterized in that, profile is that a polygonal oblique crank Z connects.

3. electric tool according to claim 2 is characterized in that, it is a triangular section bar that polygonal oblique crank Z connects.

4. electric tool according to claim 1 is characterized in that, profile is that a gapped gear shaft or wedge shape axle connect.

5. electric tool according to claim 4 is characterized in that, the wedge shape axle is connected to straight sided and center symmetry.

6. electric tool according to claim 4 is characterized in that, it is a bevel pinion section bar that gear shaft connects.