CN202318261U

CN202318261U - Electric tool speed changer

Info

Publication number: CN202318261U
Application number: CN201120301742XU
Authority: CN
Inventors: 王云逸; 李�昊
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-07-11
Anticipated expiration: 2021-08-18

Abstract

The utility model relates to an electric tool speed changer which can switch between a high-speed rotation output and low-speed rotation output. The utility model is based on a 2K-H type epicyclic train: the planetary pinion carrier along with the planetary wheel can move in the axial direction of the planetary pinion carrier so as to approach to or get away from the output sun wheel, so that the planet carrier can contact or be separated from the friction wheel on the output sun wheel, and the planetary wheel can be separated from or mesh with the sun wheel. The end face of each gear tooth is sharp, so as to avoid tooth latching in the speed changing process. When the planetary pinion carrier gets away from the output sun wheel, the friction wheel is separated from the planetary pinion carrier and the gears mesh with each other properly, a low rotating speed is output. When the planetary pinion carrier approaches to the output sun wheel, the friction wheel contacts the planetary pinion carrier and the gears demesh, the input rotating speed is directly output, and a high rotating speed is output.

Description

Speed variator for electrical tool

Affiliated technical field

The utility model relates to a kind of speed change gear and method for using thereof that is applicable to electric tool.

Background technology

At present, portable power tool commonly used mainly is divided into two types: output speed is lower, torque is relatively large, is used to install and remove the electric screw driver of bolt class securing member and output speed is higher, torque is less relatively, is used in the electric drill of work such as punching, polishing.This two type electric tool can satisfy usual requirements of one's work.But; If smallclothes such as for example modelling, the making of student's contest works, a small amount of, low-cost and often need to punch, polish, in the making work of mounting or dismounting repeatedly; Must buy multiple electric tool just can satisfy the demand; This can increase cost undoubtedly, can make troubles to making because of often changing electric tool simultaneously.

So, design a kind of electric tool that can between output low speed, big torque and high speed, little torque, change and just can satisfy similar requirements of one's work and can practice thrift cost.But before the so dual-purpose portable power tool of design, at first want to design a kind of this electric tool that is applicable to, can be at output low speed, big torque and at a high speed, the speed change gear that change between the little torque.

Summary of the invention

Huge (electric drill can reach per minute several thousand commentaries on classics because the output speed of electric drill and electric screw driver differs; And the general per minute more than 100 of electric screw driver changes); In order to overcome the difficulty that this speed difference is brought; And guaranteeing that electric screw driver can be used as the normal screws cutter and uses under a stable condition, the utility model provides a kind of speed changer that is applicable to this electric tool.This speed changer is based on a kind of 2K-H type planet circular system.When the needs output slow-speed of revolution, the gear of speed changer is all meshed, just realized the deceleration of big speed ratio.When needs were exported high rotating speed, power shaft directly docked with output shaft, and gear breaks away from engagement, has just realized high-revolving output.The torque of torque when also having guaranteed naturally simultaneously to export the slow-speed of revolution during greater than high speed, and be inversely proportional to the ratio of speed.

The utility model solves this technical problem the concrete scheme that is adopted:

Select the input of high-speed electric expreess locomotive as power.The planet carrier of planet circular system is initiatively accepted the power input of motor.On the sun gear opposing end faces of planet carrier and outputting power friction pulley is housed all, promptly forms a friction clutch.Can not move axially between planet carrier and the planetary gear, its integral body can realize gear meshing and separate along moving axially of planet carrier, cooperates the variation that realizes the speed changer output speed with friction pulley.Its distance that moves is not less than the thickness of gear.

When the needs output slow-speed of revolution; Planet carrier moves to two friction pulleys along axis to the direction away from the output sun gear to be separated fully, all engagements fully of all gears this moment, and this speed changer promptly becomes the planetary gear speed reducer of standard; Output speed is low at this moment, torque is big, promptly in the electric screw driver pattern.Its gearratio should design according to actual needs.This moment also can be with electric screw driver when normal screws cutter usefulness, because when the active of output sun gear, this planet circular system produces self-locking.

When needs are exported high rotating speed; Planet carrier moves to two friction pulleys along axis to the direction near the output sun gear and contacts fully; This moment, all gears broke away from engagement fully, and power shaft directly is connected with output shaft, and input speed is directly exported; Output speed is high at this moment, torque is little, is the electric drill pattern.

In addition; This speed changer is when switching; Planetary gear is to break away from or the engagement of entering and sun gear through moving axially, and promptly the centre-to-centre spacing of planetary gear and sun gear is constant, so all gears of this speed changer all are sharp at the gear teeth place of end face; To avoid latch when gear gets into engagement again, so that realize the speed change of speed changer smoothly.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is the structural representation of the utility model under the electric screw driver pattern.

Fig. 2 is the structure diagram of the utility model.

Fig. 3 is the threedimensional model of the utility model.

Fig. 4 is the gear face characteristic 3 D figure of the utility model.

1. sun gears 1 (outputting power) among the figure; 2. planetary gear 2; 3. planetary gear 3; 4. sun gear 4; 5. pedestal; 6. planet carrier; 7. power input shaft; 8. power output shaft; 9. friction pulley; 10. retainer; 11. shell.

The specific embodiment

Sun gear 4 (4) is fixed on the pedestal (5), and sun gear 1 (1) is installed on the shell (11) through bearing after being rigidly connected with power output shaft (8).Planetary gear 2 (2) and planetary gear 3 (3) aggregate erections must not relatively rotate between it on same axle.A pair of friction pulley (9) is installed respectively and the end face of sun gear 1 (1) and the end face of planet carrier (6).Planet carrier (6) and power input shaft (7) are rigidly connected, and after installing with planetary gear is correct, the speed changer of packing into makes each gear correct engagement.Retainer (10) is used to keep the relative position of many group planetary gears.

When [0017] using, when each gear was in complete engagement, speed changer played decelerating effect, promptly in the electric screw driver pattern.At this moment, if do not import power, this electric tool still can be worked as the normal screws cutter and used, because when sun gear 1 (1) active, this speed changer produces self-locking.When planet carrier (6) moves to two friction pulleys (9) when contacting fully to sun gear 1 (1), each gear breaks away from engagement fully.The power of power shaft input this moment is directly from output shaft output, promptly in the electric drill pattern.

Claims

1. speed variator for electrical tool is characterized in that: two sun gear coaxial lines are installed, and at least one group of planetary gear arranged around sun gear, and planet carrier is exported on two relative end faces of sun gear with power and is separately installed with friction pulley.

2. speed variator for electrical tool according to claim 1 is characterized in that: each gear teeth of all sun gears and planetary gear are sharp in the end.