CN2768980Y

CN2768980Y - Electric spanner

Info

Publication number: CN2768980Y
Application number: CN 200520069268
Authority: CN
Inventors: 朱景寿
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-22
Filing date: 2005-02-22
Publication date: 2006-04-05
Anticipated expiration: 2015-02-22

Abstract

The utility model relates to an electric spanner which comprises a gear box body, a machine hook with a handle, a motor connected to the machine hood, a gear reduction mechanism, a shock sleeve and a spanner head, wherein the gear box body is fixedly connected with the machine hood through a middle cover. The gear reduction mechanism comprises a gear shaft connected to the middle cover and the gear box body, a duplicate gear connected to the gear shaft, a main shaft supported and connected to the middle cover and the spanner head, and a reduction gear connected to the main shaft, wherein the duplicate gear is respectively engaged with an output tooth shaft of the motor and the reduction gear. Rolling balls are arranged in a Y-shaped groove on the periphery wall of the main shaft, the groove on the periphery wall of the main shaft is correspondingly clamped with a groove on the inner periphery wall of the shock sleeve, and rolling balls are arranged in the U-shaped groove of the shock sleeve. Springs sheathed on the main shaft are respectively connected with the reduction gear and block sheets on the end surfaces of the rolling balls, and a clamping block on the end surface of the shock sleeve is clamped with or separated from the end surface of the spanner head. The utility model has the characteristics of simple structure, reasonable technology and reliable work.

Description

Electric wrench

Technical field

The utility model relates to a kind of spanner, especially relates to the electric wrench of a kind of energy fast assembling-disassembling bolt, nut.

Background technology

Electric wrench is to provide electronic by motor, by the motor-driven driving end, produces impact torsion, fast assembling-disassembling bolt or nut.Usually electric wrench by casing, motor, spanner is first-class constitutes.Its motor of a kind of electric wrench of structure directly links to each other with driving end, drives the positive and negative rotation of driving end and assembling-disassembling bolt or nut because driving torque is little, cause motor load big, and stream time is short, inefficiency.The output shaft of its motor of electric wrench of another kind of structure is to reach driving end by planetary gear reducing mechanism, with the operating efficiency of raising electric wrench, but planetary gear reducing mechanism structure relative complex, matching requirements height, manufacturing cost height.

Summary of the invention

The purpose of this utility model provides a kind of simple and reasonable for structure, the electric wrench of reliable operation.

The utility model is that the technical scheme that addresses the above problem is: a kind of electric wrench, comprise gear housing, the hood that has handle, be connected the motor in the hood, gear reduction and impact cover and driving end, described gear housing is fixedlyed connected with hood by middle cover, gear reduction comprises the gear shaft that is connected on middle cover and the gear housing, be connected the duplicate gear on the gear shaft, supporting is connected the main shaft on middle cover and the driving end and is connected reduction gearing on the main shaft, duplicate gear meshes with motor output gear axle and reduction gearing respectively, in the herringbone grooves on the main shaft periphery wall ball is housed, and with impact the cover internal perisporium on the corresponding clamping of groove, impact in the U-lag that overlaps ball is housed, be enclosed within on the main shaft spring respectively with reduction gearing and ball end face on catch join, the fixture block that impacts the cover end face is with the clamping of driving end end face or separate.

The utility model adopts the two-stage gear reduction, and is not only simple in structure, and can increase the electric wrench impulsive torque, increases work efficiency.The spring that is sleeved on the main shaft of the utility model withstands on respectively on reduction gearing and the ball in addition, and spring stress is even, so when impacting the moment that cover combines or breaks away from driving end, stressed comparatively smooth-going.Owing on ball, be provided with catch, prevent that also ball breaks away from, and guarantee that spring stress is even simultaneously.Secondly, the utility model is to make main shaft and impact cover and is connected by ball, and under the effect of spring pressure, and is on main shaft and impact to move in the herringbone grooves that puts and make impact overlap with the main shaft joint or separate, rational in infrastructure by ball.Moreover the utility model can control precompression with regulating spring by forward and backward adjustment packing ring, and it is easy to adjust, good manufacturability.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

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

Wherein: 1-driving end; 2-oil sealing; 3-gear housing; 4-ball; 5-catch; 6-impact and overlap; 7-gear wheel; 8-spring; Packing ring is adjusted in 9-back; 10-axle sleeve; 11-middle cover; 12-bearing; 13-spacer ring; 14-wind wheel; 15-motor; 16-bearing; 17-hood; 18-hood; 19-duplicate gear; 20-gear shaft; 21-main shaft; 21-1-herringbone grooves; 22-preceding adjustment packing ring; 23-axle sleeve.

The specific embodiment

See electric wrench of the present utility model shown in Figure 1, comprise gear housing 3, have hood 18, motor 15, the gear reduction of handle and impact cover 6 and driving end 1.Gear housing 3 of the present utility model is connected with middle cover 11, hood 18 is connected on the middle cover 11, by middle cover 11 electric wrench is divided into gear parts and motor part, the rotor of motor 15 is connected in the hood 18 by bearing 12,16, and carbon brush is connected on the hood 18, spacer ring 13 also is housed in the hood 18, and be positioned at the rear portion of wind wheel 14, between middle cover 11 and hood 18, be provided with the air intake gap, hood 17 with air-out notch is connected on the hood 18, cools off by 14 pairs of motors of wind wheel.See shown in Figure 1, gear reduction of the present utility model comprises the gear shaft 20 that is connected on middle cover 11 and the gear housing 3, be connected the duplicate gear 19 on the gear shaft 20, supporting is connected the main shaft 21 on middle cover 11 and the driving end 1 and is connected reduction gearing 7 on the main shaft 21, middle cover 11 has axle bed, axle sleeve 10 is contained in the axle bed, main shaft 21 is connected on the middle cover 11 by axle sleeve 10, duplicate gear 19 respectively with the output gear axle of motor 15 and reduction gearing 7 engagements, realize double reduction, to increase the output torque of driving end.Main shaft 21 periphery walls of the present utility model are provided with herringbone grooves 21-1, be equipped with in the herringbone grooves 21-1 ball and with impact cover 6 internal perisporiums on the corresponding clamping of groove, and can in herringbone grooves 21-1, move, impact in the cover 6 and have U-lag, one circle ball 4 is housed in its U-lag, one catch 5 is arranged on the ball 4, to prevent that ball 4 breaks away from when spring 8 is stressed, the spring 8 that is enclosed within on the main shaft 21 joins with reduction gearing 7 and catch 5 respectively, impacting cover 6 is T shape, be connected the end of gear housing 3 by axle sleeve 23, and be tightly connected by oil sealing 2 and gear housing 3 oral areas, the convex-concave fixture block that impacts cover 6 end faces is with driving end 1 end face clamping or separate.Adjustment packing ring 22 is adjusted packing ring 9 and be provided with the back between the end face of reduction gearing 7 and axle sleeve 10 end faces before being provided with between driving end 1 and the gear housing 3, by the thickness of preceding adjustment packing ring 22 and back adjustment packing ring 9, comes the precompression of regulating spring 8.When motor 15 passes through gear reduction with power, make and impact that cover 6 drives that the positive and negative rotation of driving end 1 high speeds is tightened or when unclamping bolt or nut, when coupling mechanism force increases torsion greater than 1 pair of bolt of working head or nut gradually, impacting cover 6 moves in its herringbone grooves by ball, and dead spring 8 and break away from driving end 1, when the moment of impacting cover 6 disengaging driving ends 1, impact cover 6 and continue rotation at a high speed, and under the elastic force effect of spring 8, again with driving end 1 clamping, return to original position, kinetic energy is transformed into impulsive force, circulate with this.

Claims

1, a kind of electric wrench, comprise gear housing (3), the hood (18) that has handle, be connected the motor (15) in the hood (18), gear reduction and impact cover (6) and driving end (1), it is characterized in that: described gear housing (3) is fixedlyed connected with hood (18) by middle cover (11), gear reduction comprises the gear shaft (20) that is connected on middle cover (11) and the gear housing (3), be connected the duplicate gear (19) on the gear shaft (20), supporting is connected the main shaft (21) on middle cover (11) and the driving end (1) and is connected reduction gearing (7) on the main shaft (21), duplicate gear (19) meshes with motor (15) output gear axle and reduction gearing (6) respectively, in the herringbone grooves (21-1) on main shaft (21) periphery wall ball is housed, and with impact cover (6) internal perisporium on the corresponding clamping of groove, impact in the U-lag that overlaps (6) ball (4) is housed, be enclosed within on the main shaft (21) spring (8) respectively with reduction gearing (7) and ball (4) end face on catch (5) join, the fixture block that impacts cover (6) end face is with driving end (1) end face clamping or separate.

2, electric wrench according to claim 1 is characterized in that: the described spacer ring (13) that is contained in the hood (18) is positioned at the rear portion of wind wheel (14), and is provided with the air intake gap between middle cover (11) and the hood (18).

3, electric wrench according to claim 1 is characterized in that: described main shaft (21) is connected with middle cover (11) by axle sleeve (10), and is provided with adjustment packing ring (9) in back between reduction gearing (7) end face and axle sleeve (1) end face

4, electric wrench according to claim 1 is characterized in that: adjust packing ring (22) before being provided with between driving end (1) and the gear housing (3).