CN2544901Y

CN2544901Y - Centrifugal electric wrench

Info

Publication number: CN2544901Y
Application number: CN 02217042
Authority: CN
Inventors: 朱建平
Original assignee: NINGBO XIELI MECHANICAL AND ELECTRICAL MANUFACTURE CO Ltd
Current assignee: NINGBO XIELI MECHANICAL AND ELECTRICAL MANUFACTURE CO Ltd
Priority date: 2002-04-23
Filing date: 2002-04-23
Publication date: 2003-04-16
Anticipated expiration: 2012-04-23

Abstract

A centrifugal-typed electric wrench comprises a casing and a motor in the casing, a detent, a detent seat and a ratchet wheel. The utility model is characterized in that the output shaft of the motor is connected with the detent seat by a gear reducing mechanism. The output shaft of the motor and the detent seat had better not to be arranged in the same axis line; the gear reducing mechanism can consist of a drive gear and a driven gear which are mutually engaged; wherein, the motor shaft is coaxially connected with the drive gear with small diameter, while the detent seat is coaxially connected with the driven gear with great diameter. The motor shaft can be connected with the drive gear by tight matching type or by keyway; the detent seat is connected with the driven gear by a spline shaft. Compared with the prior art, the utility model has the advantages that the gear reducing mechanism is additionally arranged between the output shaft of the motor and the detent seat, thus improving the output moment of the electric wrench and reducing the impact to the motor in accidental brake; furthermore, the output shaft of the motor is staggered with the axis line of the detent seat, thus efficiently reducing the frontal impact to the motor caused by operation.

Description

A kind of centrifugal electric spanner

Technical field

The utility model relates to a kind of motor-driven autowrench, particularly a kind of centrifugal electric spanner.

Background technology

Centrifugal electric spanner generally comprises casing and interior motor thereof, ratchet and pawl base thereof, ratchet and output shaft, when motor rotation and the rotation of driving pawl base, when reaching certain speed, pawl base is temporarily decontroled by the ratchet of its locking, so ratchet is deflection under the action of the centrifugal, the bump ratchet makes it to rotate, behind the bump, rotating speed descends, and ratchet is resetted by its pawl base locking again, when rotating speed rises to certain speed once more, repeat above-mentioned action, going round and beginning again to make ratchet do intermittent the rotation, thereby makes driving head work by output shaft, realizes the function of electric wrench." a kind of centrifugal electric spanner " that No. 99251905.5, our patent formerly discloses a kind of such centrifugal electric spanner.Yet present its pawl base of existing centrifugal electric spanner directly links to each other with motor shaft, and its shortcoming is that therefore motor shaft will directly bear the impulsive force from the front owing to be on the same axis with pawl base, output shaft; And pawl base is directly driven by motor shaft, and therefore the output torque to motor has certain requirement, simultaneously, when the output shaft of electric wrench is braked suddenly because of accident, will directly cause the moment braking of motor shaft, thereby cause damage might for the coil of motor; On the other hand, motor shaft and pawl base directly assemble, and be also very inconvenient in manufacturing, processing.

Summary of the invention

Technical problem to be solved in the utility model be provide at above-mentioned prior art present situation a kind of under equal power of motor the bigger centrifugal electric spanner of output torque.

The centrifugal electric spanner less when another technical problem to be solved in the utility model provides a kind of unexpecred braking at work to electromechanical shock.

Another technical problem to be solved in the utility model provides a kind of centrifugal electric spanner that can effectively reduce motor shaft suffered frontal impact when work.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: centrifugal electric spanner comprises casing and interior motor, ratchet and pawl base thereof and ratchet thereof, it is characterized in that described motor output shaft links to each other with pawl base by a gear reduction.

Described motor output shaft and described pawl base be not being good on same axis;

Described gear reduction can have by intermeshing driving gear and driven gear and constitutes, motor shaft driving gear coaxial be connected less with diameter wherein, the coaxial connection of driven gear that pawl base is then bigger with diameter.

Can be connected by tight fit between described motor shaft and the driving gear, also can connect by the keyway mode; Described pawl base then can be connected by splined shaft with driven gear.

Compared with prior art, advantage of the present utility model be by motor output shaft and and pawl base between increase gear reduction, both improved the output torque of electric wrench, when having reduced unexpecred braking again to the impact of motor, and, with motor output shaft with the axis misalignment of pawl base, the frontal impact that in the time of can reducing work effectively motor is caused.

Description of drawings

Fig. 1 is the structure cross-sectional schematic of the utility model embodiment.

Fig. 2 is the partial enlarged drawing among Fig. 1.

Fig. 3 is the left view (removing gear box cover 31) of Fig. 2.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 3, centrifugal electric spanner comprises casing 1 and interior motor 2 thereof, ratchet 7 and pawl base 6 thereof and ratchet 8, described motor output shaft 21 passes through one by intermeshing driving gear 4, the gear reduction that driven gear 9 constitutes links to each other with pawl base 6, wherein the less driving gear 4 coaxial tight fits of motor shaft 21 and diameter are connected, pawl base 6 then with the bigger driven gear 9 of diameter by 5 coaxial connections of splined shaft, thereby make motor output shaft 21 and pawl base 6 with not on same axis, described ratchet 8 front ends are the output shaft of whole electric wrench, and 3 is gear-box among the figure.

Claims

1, a kind of centrifugal electric spanner comprises casing and interior motor, ratchet and pawl base thereof, ratchet and output shaft thereof, it is characterized in that described motor output shaft links to each other with pawl base by a gear reduction.

2, centrifugal electric spanner according to claim 1 is characterized in that described motor output shaft and described pawl base be not with on same axis.

3, according to claim 1 or 2 described centrifugal electric spanners, it is characterized in that described gear reduction is made of intermeshing driving gear and driven gear, motor shaft driving gear coaxial be connected less wherein with diameter, the coaxial connection of driven gear that pawl base is then bigger with diameter.

4,, it is characterized in that being connected for tight fit between described motor shaft and the driving gear according to the described centrifugal electric spanner of claim 3.

5,, it is characterized in that being connected for the keyway mode between described motor shaft and the driving gear according to the described centrifugal electric spanner of claim 3.

6,, it is characterized in that and described pawl base is connected by splined shaft with driven gear according to the described centrifugal electric spanner of claim 3.