CN202455865U

CN202455865U - Automatic brake device

Info

Publication number: CN202455865U
Application number: CN2011205420576U
Authority: CN
Inventors: 孙亮亮
Original assignee: ZHEJIANG SAFUN INDUSTRIAL Co Ltd
Current assignee: ZHEJIANG SAFUN INDUSTRIAL Co Ltd
Priority date: 2011-12-22
Filing date: 2011-12-22
Publication date: 2012-10-03
Anticipated expiration: 2021-12-22

Abstract

The utility model discloses an automatic brake device, which comprises a motor, a reduction box, an output shaft, a motor shaft, a big gear wheel and a small gear wheel, wherein the motor and the output shaft are arranged on the reduction box, the big gear wheel is fixed on the output shaft, the small gear wheel is fixed on the motor shaft, the big gear wheel and the small gear wheel are meshed and are arranged in the reduction box, and a friction block arranged at the lower side of the big gear wheel is fixed in the reduction box. The automatic brake device also comprises an upper ratchet wheel, a lower ratchet wheel and a drive pin, wherein the upper ratchet wheel and the lower ratchet wheel are respectively arranged on the upper side and the lower side of the big gear wheel, the ratchet wheel surfaces of the upper ratchet and the lower ratchet are coincided to form a spiral track, the drive pin is fixed on the output shaft and is positioned in the spiral track, an upper gear and a lower gear are arranged in the spiral track, and the drive pin can slide in the spiral track. The automatic brake device has the advantages of simple structure, high safety, good braking effect, low production cost, long service life, stability and reliability in operation, and the like.

Description

A kind of dead-man's device

Technical field:

The utility model relates to the dead-man's device of a kind of dead-man's device, particularly a kind of garden instrument.

Background technology:

Mower is a kind of garden instrument commonly used, and it, drives the output shaft that blade is installed through belt or gear drive and carry out operation as drive unit with motor.If in operation way, need to shut down, the operator at first will cut off the electricity supply, behind the dump, because under action of inertia, output shaft and blade still can run up a period of time, thus can not satisfy security requirement, in the time of seriously even can cause personal injury.And in design objective, require blade to stop operating in second by the 3-5 after cutting off the electricity supply, so production firm all is equipped with brake gear on mower.Brake gear is one of important component of mower, is used to suppress the high speed rotating of blade and is halted state until it.The comparatively ripe scheme in this field is to adopt the mode of brake disc and skid, and promptly brake disc produces along output shaft and moves axially, when its with after the skid generation contacts, rely on the rotation of the frictional force inhibition brake disc between the two.The disclosed a kind of mower brake of CN101785388A for example; It comprises motor, passive chassis supports frame that power is provided, is housed in brake disc, skid and output shaft in the chassis supports frame; Brake disc is set on the output shaft, links together through axle sleeve between brake disc and the output shaft, is formed with skewed slot on the side of axle sleeve; A pin that is connected on the output shaft is housed in the skewed slot, and can slide relatively along skewed slot.Be provided with the rolling element of steel ball or needle roller between output shaft and the axle sleeve, make output shaft and axle sleeve form the gap and be connected, connected output shaft and axle sleeve through a pin; Realized that axle sleeve can produce the displacement on the axial direction along output shaft, skewed slot has a low order position and a upper level position along horizontal plane, and pin can slide between low order position and upper level position; When pin is positioned at the low order position; Brake disc and skid contact, and are in braking state, and when pin is positioned at upper level position; Brake disc separates with skid, and is in running order.The shortcoming of this structure is:

1, brake process needs the long time, so just can not satisfy security requirement, does not reach the requirement that blade in the design objective can the 3-5 after cutting off the electricity supply stops operating in second; 2, braking effect is bad, and safety is relatively poor; 3, structure is comparatively complicated, production cost is high and assemble up inconvenience.Therefore, be necessary to improve.

The utility model content:

The goal of the invention of the utility model is to overcome the deficiency of above-mentioned prior art, provide a kind of simple in structure, safe, braking effect is good, production cost is low, long service life and stable and reliable operation dead-man's device.

For realizing the foregoing invention purpose, the utility model has adopted following technical scheme:

A kind of dead-man's device comprises motor, reduction box, output shaft, motor shaft, gear wheel and pinion, wherein; Motor and output shaft are installed on the reduction box; Be fixed with gear wheel on the output shaft, be fixed with pinion on the motor shaft, gear wheel and pinion are meshed and are arranged in the reduction box; Also be fixed with in the reduction box one be positioned at the gear wheel downside brake pad; Also comprise ratchet, bottom ratchet wheel and trundle, said upward ratchet and bottom ratchet wheel are separately positioned on the upper and lower side of said gear wheel axis hole, and the ratchet surface of the two caters to formation one volute track mutually; Said trundle is fixed on the said output shaft and places in the said volute track; Be provided with upper and lower two gears in the said volute track, when said trundle slid into gear in the volute track, said gear wheel moved axially with said brake pad disengaging and drives said output shaft and rotates; When said trundle slid into gear in the volute track, said gear wheel moved axially to contact with said brake pad and produces frictional force and realize braking.

Said bottom ratchet wheel and said gear wheel are one-body molded, and the said ratchet of going up is fixed on the said gear wheel through screw.

Said output shaft is installed on the said reduction box through the clutch shaft bearing and second bearing.

Said reduction box comprises reduction box loam cake and reduction box lower cover, and said brake pad is fixed under the said reduction box and covers, and said motor is fixed on the said reduction box and covers.

Said output shaft is provided with the through hole that radially runs through, and said trundle is installed in the through hole and two ends expose to said output shaft.

The utility model has following advantage with respect to prior art:

1, the utility model can satisfy in the design objective requirement that mower is realized braking in 3 seconds after cutting off the electricity supply, and braking effect is good and safe.

2, the utility model has only when trundle slides into gear in the volute track; Gear wheel just can move axially with brake pad and come in contact; Can prevent that like this gear wheel from moving voluntarily in the process of running up, thereby avoid the generation of the phenomenon of braking certainly effectively.

3, the utility model is in energized; Electric motor starting moment output shaft is actionless; Pinion drives gear wheel and rotates relative to output shaft; Have only following gear and trundle in turning to the volute track to replace when contacting, just can promote trundle and drive output shaft and rotate, in running order then.Adopt such design can make starting current little, can improve the reliability and the fault rate that reduces motor of power supply to the little while of the influence of electrical network.

4, the utility model long service life brake number of times reaches 6000 times.

5, the utility model all is the action of accomplishing automatically that need not add in the whole process of brake, and working stability is reliable.

6, the utility model is simple in structure, production cost is low and assemble up very convenient.

Description of drawings:

Fig. 1 is the end view of the utility model.

Fig. 2 removes the end view behind the reduction box for the utility model.

Fig. 3 is the explosive view of the utility model.

The structural representation that Fig. 4 is fixed together after catering to for ratchet on the utility model and gear wheel.

Fig. 5 is the explosive view of Fig. 4.

Embodiment:

Referring to Fig. 1 to Fig. 5,, comprise motor 1, reduction box 2, output shaft 3, motor shaft 4, gear wheel 5 and pinion 6 according to a kind of dead-man's device that the utility model provides; Wherein, motor 1 is installed on the reduction box 2 with output shaft 3, is fixed with gear wheel 5 on the output shaft 3; Be fixed with pinion 6 on the motor shaft 4; Gear wheel 5 is meshed with pinion 6 and is arranged in the reduction box 2, also be fixed with in the reduction box 2 one be positioned at gear wheel 5 downsides brake pad 7, also comprise ratchet 8, bottom ratchet wheel 9 and trundle 10; Last ratchet 8 and bottom ratchet wheel 9 are separately positioned on the upper and lower side of gear wheel 5 axis holes; And the ratchet surface of the two caters to mutually and forms a volute track, and trundle 10 is fixed on the output shaft 3 and places in the volute track, is provided with upper and lower two gears in the volute track; When trundle 10 slides into gear in the volute track; Gear wheel 5 moves axially and brake pad 7 breaks away from and drive output shaft 3 rotates, and when trundle 10 slid into gear in the volute track, gear wheel 5 moved axially contact with brake pad 7 and produces frictional force and realize braking.

Bottom ratchet wheel 9 is one-body molded with gear wheel 5, and last ratchet 8 is fixed on the gear wheel 5 through screw.Output shaft 3 is installed on the reduction box 2 through the clutch shaft bearing 31 and second bearing 32.Reduction box 2 provides reliable seal casinghousing for gear wheel 5 and pinion 6 transmissions.Reduction box 2 comprises reduction box loam cake 21 and reduction box lower cover 22, and brake pad 7 is fixed on the reduction box lower cover 22, and motor 1 is fixed on the reduction box loam cake 21.Output shaft 3 is provided with the through hole that radially runs through, and trundle 10 is installed in the through hole and two ends expose to output shaft 3, and this matching relationship makes output shaft 3 and trundle 10 secure fit to be in the same place.

The operation principle of the utility model is: energized, and motor 1 startup moment output shaft 3 is static, and pinion 6 drives gear wheels 5 and rotates relative to output shaft 3; When the following gear in turning to the volute track and trundle 10 are replaced and contacted, drive gear wheel 5 and move up, gear wheel 5 and brake pad 7 are broken away from; Simultaneously, promote trundle 10 and drive output shaft 3 rotations, in running order; After motor 1 outage; The inertia of output shaft 3 is much larger than the inertia of gear wheel 5, and output shaft 3 produces speed discrepancies with gear wheel 5, when this rotating speed official post output shaft 3 drives trundles 10 and slides into the last gear in the volute track; Drive gear wheel 5 and move down, gear wheel 5 is contacted with brake pad 7 produce frictional force realization braking.

The disclosed dead-man's device of the utility model be with mower as concrete embodiment, but be not just to be confined to be applied on the mower, can adopt such dead-man's device equally in other various graden machines and the electric tool.

Claims

1. dead-man's device; Comprise motor (1), reduction box (2), output shaft (3), motor shaft (4), gear wheel (5) and pinion (6); Wherein, motor (1) and output shaft (3) are installed on the reduction box (2), are fixed with gear wheel (5) on the output shaft (3); Be fixed with pinion (6) on the motor shaft (4); Gear wheel (5) and pinion (6) are meshed and are arranged in the reduction box (2), also be fixed with in the reduction box (2) one be positioned at gear wheel (5) downside brake pad (7), it is characterized in that: also comprise ratchet (8), bottom ratchet wheel (9) and trundle (10); Said upward ratchet (8) and bottom ratchet wheel (9) are separately positioned on the upper and lower side of said gear wheel (5) axis hole; And the ratchet surface of the two caters to mutually and forms a volute track, and said trundle (10) is fixed on said output shaft (3) and goes up and place in the said volute track, is provided with upper and lower two gears in the said volute track; When said trundle (10) slides into gear in the volute track; Said gear wheel (5) moves axially to break away from said brake pad (7) and drive said output shaft (3) and rotates, and when said trundle (10) slid into gear in the volute track, said gear wheel (5) moved axially contact with said brake pad (7) and produces frictional force and realize braking.

2. a kind of dead-man's device according to claim 1 is characterized in that: said bottom ratchet wheel (9) is one-body molded with said gear wheel (5), and the said ratchet (8) of going up is fixed on the said gear wheel (5) through screw.

3. a kind of dead-man's device according to claim 1 is characterized in that: said output shaft (3) is installed on the said reduction box (2) through clutch shaft bearing (31) and second bearing (32).

4. a kind of dead-man's device according to claim 1; It is characterized in that: said reduction box (2) comprises reduction box loam cake (21) and reduction box lower cover (22); Said brake pad (7) is fixed on the said reduction box lower cover (22), and said motor (1) is fixed on the said reduction box loam cake (21).

5. a kind of dead-man's device according to claim 1 is characterized in that: said output shaft (3) is provided with the through hole that radially runs through, and said trundle (10) is installed in the through hole and two ends expose to said output shaft (3).