CN2405708Y

CN2405708Y - Portable electric spanner

Info

Publication number: CN2405708Y
Application number: CN 00216188
Authority: CN
Inventors: 顾立德
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-18
Filing date: 2000-01-18
Publication date: 2000-11-15
Anticipated expiration: 2010-01-18

Abstract

The utility model relates to a portable electric spanner, which comprises a casing, a motor, a speed changer and a clutch. The utility model is characterized in that a slide block is rotationally connected with a flywheel of the clutch through a shaft pin, and a projection is arranged on a main shaft. When the flywheel is driven to rotate by the motor, energy can be gradually accumulated, the slide block can be clashed with the projection of the main shaft when a certain rotation speed is reached, and the accumulated energy can be instantly released, so that the tool has powerful locking forces. The utility model has the advantages of small size, light weight, convenient use, and portability; a 12 V direct current power supply is used, and the maximal energy consumption is lower than 100W; the portable shape and structure can be suitable for various bolts and nuts. The utility model can be used as a vehicle tool for various automobiles.

Description

A kind of portable type electric wrench

The utility model relates to a kind of electric tool, particularly a kind of portable electric wrench that is used for assembling-disassembling bolt, nut that uses with automobile.

In the prior art, general assembling-disassembling bolt, nut all need use spanner.Particularly when the dismounting doughnut,, just must have powerful coupling mechanism force in order to guarantee the security performance of wheel when running up.When using spanner dismounting tire with manpower, need the bigger strength of cost, more need tramp with one's feet sometimes and step on as auxiliary.In order to reduce labor intensity, so a kind of electronic tire machine that changes that just has been born, this instrument is according to the needed powerful coupling mechanism force of nut, though through speed change, still need thousands of watts motor could satisfy its needs to moment of torsion.The weight of such machine and great number energy consumption make it can only be applicable to motor vehicle repair producer, always and the damage of tire occurs in the driving process of vehicle, therefore can not adapt to the needs that carry with car.

The purpose of this utility model is to overcome defective of the prior art, provide a kind of in light weight, the power consumption low, the portable electric wrench that coupling mechanism force is strong.

To achieve these goals, the utility model is by the following technical solutions: comprising housing, be installed in the motor in the housing, the planetary transmission that is connected with motor output shaft, the clutch that is connected with the planetary transmission output shaft, and in the portable type electric wrench of the main shaft that links to each other with clutch, described clutch is the flywheel of a hollow, this flywheel inside is by the pivot pin slide block that is rotationally connected, main shaft is by bearing and flywheel and is rotationally connected, and the part of this main shaft in flywheel is equipped with a projection.

The utility model has utilized flywheel and slide block structure, makes the accumulation of small-power using energy source time obtain big kinetic energy, so that this instrument has very strong coupling mechanism force, thereby makes the energy of small-sized car type by self storage battery, and the loading and unloading tire becomes possibility.This small product size is little, and is in light weight, can carry with car.Because cost of manufacture is low, make it both to have made things convenient for the user simultaneously, make manufacturer produce very considerable economic again.The utility model adopts 12 volts of dc sources, and maximum energy consumption is below 100 watts, and portable appearance structure can be suitable for multiple bolt, nut.

The utility model will be further described below in conjunction with accompanying drawing and embodiment.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the utility model flywheel, the structural representation of slide block structure.

Please refer to Fig. 1, the utility model has a housing 3, and this housing 3 is general injection molded with engineering plastics.One motor 11 is installed in housing 3, and the utility model has adopted the low-voltage direct low-power machine.The output shaft of this motor 11 is connected with planetary transmission 10.This planetary transmission 10 is fixedlyed connected with clutch 16 by connector 14.

The front portion of main shaft 1 of the present utility model is a rectangular cylinder, and present embodiment is square, and its physical dimension conforms to the sleeve of standard, and sleeve is can adapted multiple, to adapt to the needs of different bolts, nut specification.Main shaft 1 after entering housing 3 in, the rear section is cylinder.Between main shaft 1 and the housing 3 axle sleeve 2 is housed, makes it to be connection movingly.

Described clutch 16 its ectosomes are the flywheel 5 of a hollow.This flywheel 5 is with main shaft 1 and is rotationally connected by being installed in bearing 4 on its forward and backward round vertical surface, bearing 6.

Please refer to Fig. 1 and Fig. 2, flywheel 5 inside are by pivot pin 8 slide block 7 that is rotationally connected, and this slide block 7 is an arc, and pivot pin 8 is parallel to the cambered surface of slide block 7 and passes slide block 7, and its two ends are fixedly connected respectively at two circle vertical surfaces of flywheel 5.The both sides of slide block 7 also are equipped with spring 15 respectively.The part of main shaft 1 in flywheel 5 is equipped with a projection 9.Slide block 7 is not under static state collided with the projection 9 of main shaft.Have only when flywheel 5 rotation to reach certain speed, slide block overcomes spring 15 pulling force and when rotating, just might run into projection 9.

Referring again to Fig. 1, reversing switch 12 of the present utility model is cut off the electricity supply during its position, centre, to the left or to the right on time, can change the polarity that dc source is input to motor, motor is clockwise or running counterclockwise, can be corresponding to the different needs of loading and unloading bolt, nut.

13 is the attaching plug that adapts with automobile cigarette lighter among the figure, can obtain power supply easily from automobile cigarette lighter, also can work as annexes such as using the storage battery folder certainly and directly take power supply from automobile storage battery.

The operation principle of electric wrench that below underdraws is so that further understand technical solutions of the utility model.

The utility model has adopted low-voltage direct low-power machine 11, drives the flywheel 5 that certain mass is arranged behind planetary gear speed-changing.When static or when just having started, left and right sides spring 15 makes slide block 7 and flywheel 5 keep relative balance states, and the projection 9 on the main shaft 1 is not collided with rotatable slide block 7, flywheel 5 motions this moment and main shaft 1 transfixion.

When flywheel 5 rotated at a high speed, because action of centrifugal force, slide block 7 rotated, and one side spring 15 is elongated.The coefficient of elasticity of spring 15 (claiming hard softness traditionally) is closely related with the rotational displacement of slide block 7, spring 15 is hard more, slide block 7 displacements are difficult more, and then promoting centrifugal force that slide block 7 rotates must be bigger, so just can make slide block 7 move to main shaft 1 on projection 9 collide.According to the principle of mv=f.st (momentum=momentum), to fix in flywheel 5 weight, also fixedly the time, the coupling mechanism force of bolt or nut (comprising dismounting) is only relevant with the rotating speed of flywheel 5 for the arm of force of flywheel 5 and sleeve.Therefore, the coefficient of elasticity of adjustment spring 15 just can reach and adjust the required bolt or the purpose of nut check power.

When flywheel 5 quickens to reach certain rotating speed, centrifugal force makes slide block 7 overcome spring 15 pulling force and rotates, thereby collides with the projection 9 on the main shaft 1, and at this moment flywheel 5 drives main shafts 1 and rotate together, thereby reaches the purpose of stubborn bolt or nut.

General clamping screw or nut often need through repeatedly impacting and can finishing.The coupling mechanism force of nut (during locking nut) can increase gradually, and main shaft 1 slows down rapidly together with the rotating speed of flywheel 5, motor 11.This moment is because the centrifugal force deficiency of flywheel 5, makes slide block 7 rotated by the pulling force effect of spring 15 and breaks away from projection 9 on the main shaft 1, and main shaft 1 stops operating.And the flywheel 5 that has broken away from main shaft 1 quickens rotation gradually under the drive of motor 11 power.When flywheel 5 reached certain rotating speed once more, centrifugal force made slide block 7 overcome spring 15 pulling force again and collides with the projection 9 on the main shaft 1, and atwirl flywheel 5 drive main shafts 1 are transformed into impulse force with whole kinetic energy and act on bolt or the nut by sleeve.And then enter next circulation again.

The process of demounting bolt or nut is also approaching substantially.Locking and demounting bolt or nut, the direction of rotation of main shaft 1 is opposite.This moment, motor 11 can be done positive and negative rotation as long as change the positive-negative polarity of motor 11 input DC powers.The rotation direction of flywheel 5 is consistent with motor 11 direction of rotation forever.The spring 15 that is arranged on flywheel 5 left and right sides works when rotating and reverse respectively, and flywheel 5 slide block 7 when reaching the rotating speed of setting is just collided with main shaft 1, and the kinetic energy that flywheel 5 is possessed promptly becomes impulsive force to bolt or nut by main shaft 1.

Claims

1, a kind of portable type electric wrench, comprise housing, be installed in the motor in the housing, the planetary transmission that is connected with motor output shaft, the clutch that is connected with the planetary transmission output shaft, and the main shaft that links to each other with clutch, it is characterized in that: described clutch is the flywheel of a hollow, this flywheel inside is by the pivot pin slide block that is rotationally connected, and main shaft is by bearing and flywheel and is rotationally connected, and the part of this main shaft in flywheel is equipped with a projection.

2, electric wrench according to claim 1 is characterized in that: the slide block that flywheel inside is rotationally connected by pivot pin is an arc, and pivot pin is parallel to the slide block cambered surface and passes slide block, and its two ends are fixedly connected respectively at two circle vertical surfaces of flywheel.

3, electric wrench according to claim 2 is characterized in that: the both sides of slide block also are equipped with spring respectively.

4, electric wrench according to claim 1 is characterized in that: the anterior rectangular cylinder of main shaft for matching with standard cartridges, and postmedian is a cylinder, its middle part is by axle sleeve and housing and is rotationally connected.