CN201467715U

CN201467715U - Clutch device for gearbox output shaft of lawn mower

Info

Publication number: CN201467715U
Application number: CN2009202329003U
Authority: CN
Inventors: 王挺; 张朝杰; 王强
Original assignee: Jiangsu World Plant Protecting Machinery Co Ltd
Current assignee: Jiangsu World Plant Protecting Machinery Co Ltd
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2010-05-19
Anticipated expiration: 2019-07-24

Abstract

The utility model discloses a clutch device for a gearbox output shaft of a lawn mower, which comprises a gasket, a worm wheel, a shaft sleeve I, a torsion spring and a shaft sleeve II which are sleeved on the output shaft in sequence, wherein the torsion spring is sleeved in a sliding sleeve, and the two ends thereof are respectively sleeved on the shaft sleeve I and the shaft sleeve II; a convex rib type helical line wedge block is arranged at the inner hole of the sliding sleeve; a straight claw and a bent claw at the two ends of the torsion spring are respectively propped against an axial plane on one side of the helical wedge block in the inner hole of the sliding sleeve and a helical plane on the other side thereof; a worm is meshed with the worm wheel; the shaft sleeve I is radially and fixedly connected with the worm wheel; the shaft sleeve II is fixedly connected with the output shaft through an elastic pin; a clutch disengaging shaft is vertically arranged beside the shaft sleeve II, the upper end thereof is fixedly connected with a clutch oscillating arm after passing through the upper side of a box body; the two ends of the torsion spring are respectively hooked with the upper side of the box body and one end of the clutch oscillating arm; and the other end of the clutch oscillating arm is hinged with a clutch operating mechanism. The utility model has the advantages that the structure is compact and the radial dimension is smaller; and the sliding sleeve has convenient processing, assembly and maintenance and low manufacturing cost by adopting an overall structure.

Description

Clutch device of output shaft of gear-box for lawn-mower

Technical field

The utility model relates to a kind of arrangement of clutch of output shaft of gear-box, especially a kind ofly is used to control the small-sized self-walking hay mower from walking or the arrangement of clutch of halted state, belongs to the graden machine technical field.

Background technology

Along with the growth in the living standard and the needs of beautifying the environment, no matter usable floor area rapid growth in lawn is municipal administration, residential quarters or football field, golf course or the like, and lawn maintenance work is doubled and redoubled.Hay mower plays an important role in lawn maintenance work as the greening maintenance prevention.The power of existing self-propelled small-sized hay mower engine passes to gearbox by driving belt, combination by the arrangement of clutch in the gearbox or separate realizes walking certainly of mower or stops that the quality of arrangement of clutch structure has determined the service life of gearbox.At present the arrangement of clutch of gear-box for lawn-mower adopts taper sheath and the version that the copper gear cooperates, the bellmouth that utilizes taper sheath and the conical head of copper gear in conjunction with the time frictional drive or both separate the function that realizes arrangement of clutch.Because the combination of arrangement of clutch, separation are frequently, the bellmouth face of taper sheath and the combination of the taper outer peripheral face of copper gear, when separating the relative slip of faying face very big, faying face weares and teares easily, service time, not long arrangement of clutch will lose efficacy, cause the gearbox can't outputting power, do not realize driving, hay mower also can't be realized from walking.

The patent No. is that 92100193.2 Chinese invention patent discloses a kind of " clutch that external member and axle friction are connected ", this mechanism comprises a sleeve part that is contained on the axle, an outer peripheral face that is designed to helicoid is arranged on the sleeve part, and the sleeve part combines at one end and the external member that will be fixed on the axle.A clamping ring also is housed on the sleeve part, and the inner peripheral surface of clamping ring is designed to a helicoid.Rotate clamping ring with respect to the sleeve part, the sleeve part radial compression is clamped on the axle, realize that clamping ring is connected with the friction of axle.This utility model has that axial dimension is little, part is few, the advantage of compact conformation, long service life.But the radial dimension of the clamping ring of this utility model is bigger, is not suitable for the radial dimension small construction; In addition, the combination of this clutch or separation realize by rotating clamping ring, can not adopt to rotate to some and realize that clutch combination or the device that separates just can not use.

The utility model content

The purpose of this utility model provides the arrangement of clutch of the output shaft of gear-box for lawn-mower of a kind of compact conformation, easy to operate, long service life.

The utility model is achieved by the following technical programs:

A kind of clutch device of output shaft of gear-box for lawn-mower comprises output shaft, pad, worm screw, worm gear, clutch declutch shaft, extension spring, clutch swing arm, sliding sleeve, axle sleeve I, torsion spring, axle sleeve II, resilient key; Described pad, worm gear, axle sleeve I, torsion spring, axle sleeve II are sleeved on the output shaft successively, and described torsion spring set is contained in the sliding sleeve, and its two ends are set on axle sleeve I and the axle sleeve II; Described worm and wheel engagement, described axle sleeve I is radially fixedlyed connected with worm gear, described axle sleeve II is fixedlyed connected with output shaft by resilient key, described clutch declutch shaft is vertically set on by the axle sleeve II, its shift fork that radially extends is resisted against on the end of axle sleeve II, the upper end of described clutch declutch shaft passes on the casing rear flank fixedlys connected with the clutch swing arm, and clasp joint is at an end of casing upside and clutch swing arm respectively at the two ends of described extension spring, and the other end and the on-off control mechanism of described clutch swing arm are hinged.

The purpose of this utility model can also further realize by following technical measures.

The clutch device of output shaft of gear-box of aforesaid hay mower, wherein said sliding sleeve endoporus place is provided with convex tendon type helix voussoir, and a side of described helix voussoir is an axial plane, and opposite side is a helicoid.The lead angle of convex tendon type helix voussoir is 40 °～55 °.

The clutch device of output shaft of gear-box of aforesaid hay mower, the two ends of wherein said torsion spring are respectively equipped with straight pawl and curved pawl, and described straight pawl is resisted against on the axial plane of sliding sleeve endoporus spiral voussoir one side, and described curved pawl is resisted against on the helicoid of opposite side.

The clutch device of output shaft of gear-box of aforesaid hay mower, wherein said axle sleeve I and axle sleeve II are the multidiameter nested structure, the internal diameter at described torsion spring two ends is set on described axle sleeve I and the axle sleeve II opposite end.

The utility model is simple in structure, rapid operation, long service life.Fundamentally overcome taper hole, the conehead of the taper sheath of existing clutch device of output shaft of gear-box for lawn-mower and copper gear whole in conjunction with or when separating, the relative sliding friction of both faying faces is very big, will not produce faying face wearing and tearing, the disadvantage that cause arrangement of clutch lost efficacy when long service time.The utility model adopts sliding sleeve and torsion spring to import the friction union piece of worm gear as output shaft of gear-box and power dexterously, under the tension of the extension spring on the gearbox, sliding sleeve is moved to the worm gear direction, utilize of the radial push effect of the convex tendon type helix voussoir of its endoporus to the curved pawl of torsion spring one end, support the curved pawl at torsion spring two ends and the angle between the straight pawl big, torsion spring is separated with axle sleeve II with axle sleeve I, thereby the realization output shaft separates with worm-drive, and hay mower remains on and stops from walking state.Otherwise, under the effect of external force, sliding sleeve is moved to deviating from the worm gear direction, torsion spring diminishes at the curved pawl at its two ends under the effect of the elastic force of self and the angle between the straight pawl, and its internal diameter also diminishes, and has held axle sleeve I and axle sleeve II tightly, the moment of torsion of worm gear is passed through axle sleeve I, sliding sleeve, torsion spring, axle sleeve II, be delivered to output shaft, thereby realize combining of output shaft and worm gear, hay mower can be walked certainly.The utility model compact conformation, radial dimension is less; Sliding sleeve adopts overall structure, and process and assemble is easy to maintenance, low cost of manufacture; The contact area of the convex tendon type helix voussoir of the curved pawl at torsion spring of the present utility model two ends and straight pawl and sliding sleeve endoporus is little, and curved pawl and straight pawl all pass through Quenching Treatment, and hardness is higher, and service life is longer, has improved reliability of the present utility model.

Advantage of the present utility model and characteristics will illustrate by the non-limitative illustration of following preferred embodiment and explain that these embodiment only provide as an example with reference to accompanying drawing.

Description of drawings

Fig. 1 is a front view of the present utility model;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is a three-dimensional exploded view of the present utility model;

Fig. 4 is that the A of Fig. 3 is to stereogram;

Fig. 5 is the B-B cutaway view of Fig. 1, and the utility model is in bonding state;

Fig. 6 is the B-B cutaway view of Fig. 1, and the utility model is in released state;

Fig. 7 is the assembling three-dimensional exploded view of sliding sleeve of the present utility model and torsion spring.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As Fig. 1～shown in Figure 7, the utility model comprises output shaft 1, pad 12, worm screw 6, worm gear 13, clutch declutch shaft 7, extension spring 3, clutch swing arm 5, sliding sleeve 11, axle sleeve I 14, torsion spring 15, axle sleeve II 16, resilient key 17; Pad 12, worm gear 13, axle sleeve I 14, torsion spring 15, axle sleeve II 16 are sleeved on the output shaft 1 successively, be respectively equipped with the bearing block 10 that is fixed on the casing 2 in the outside of pad 12, output shaft 1 is supported on the casing 2 by the bearing block 10 of its both sides, pad 12 is separately positioned between bearing block 10 and worm gear 13, bearing block 10 and the axle sleeve II 16, and the retaining effect is played in 11 frequent moving axially to sliding sleeve.

As Fig. 3, shown in Figure 7, torsion spring 15 is sleeved in the sliding sleeve 11, and its two ends are set on the spindle nose of axle sleeve I14 and axle sleeve II16 opposite end, locate with the shaft shoulder.The two ends of torsion spring 15 are respectively equipped with straight pawl 151 and curved pawl 152, and sliding sleeve 11 endoporus places are provided with convex tendon type helix voussoir, and a side of helix voussoir is an axial plane 111, and opposite side is a helicoid 112.As shown in phantom in Figure 7, the straight pawl 151 of torsion spring 15 is resisted against on sliding sleeve 11 endoporus spiral voussoir axial planes 111 1 sides, the curved pawl 152 of torsion spring 15 is resisted against on the helicoid 112 of sliding sleeve 11 endoporus spiral voussoir opposite sides, and the lead angle of convex tendon type helix voussoir is that α is 40 °～55 °.In order to reduce the contact area of curved pawl face and helicoid 112, reduce both wearing and tearing, torsion spring 15 1 ends have adopted the structure of curved pawl 152.

As Fig. 1, Fig. 2, shown in Figure 3, fixedly connected with belt wheel 4 by pin 9 in the upper end of worm screw 6, belt wheel 4 with the transmission of power of engine to worm screw 6, worm screw 6 and worm gear 13 engagements, axle sleeve I 14 is radially fixedlyed connected with worm gear 13 by 3 uniform protruding teeth 141 of end face, and axle sleeve II 16 is fixedlyed connected with output shaft 1 by resilient key 17.It is other that clutch declutch shaft 7 is vertically set on axle sleeve II 16, its shift fork that radially extends 71 is resisted against on the end of axle sleeve II 16, the upper end of clutch declutch shaft 7 passes on the upper box 21 of casing 2 rear flank and fixedlys connected with clutch swing arm 5 by nut 8, one end, 31 clasp joints of extension spring 3 are on the stiff end on the upper box 21 211, the other end 32 clasp joints are on a stomidium of clutch swing arm 5, and the other end of clutch swing arm 5 and the pull bar of on-off control mechanism (not drawing among Fig. 3) are hinged.Because clutch swing arm 5 is the lever construction of power arm greater than resistance arm,, just can produce bigger turning moment, rapid operation to clutch declutch shaft 7 as long as the pull bar of on-off control mechanism is applied very little power.

As Fig. 2, shown in Figure 5, external force is according to the direction pulling on-off control mechanism pull bar of arrow C indication among Fig. 2, clutch swing arm 5 is clockwise rotated around clutch declutch shaft 7 centers, extension spring 3 is elongated, the clutch declutch shaft 7 of fixedlying connected with clutch swing arm 5 also clockwise rotates, shift fork 71 turns to the outer wall of casing 2, sliding sleeve 11 right-hand member constraint reliefs, under the effect of torsion spring 15 screen resiliences, its curved pawl 152 moves along arrow D direction among Fig. 5 with the axial force promotion sliding sleeve 11 that sliding sleeve 11 endoporus spiral voussoir helicoids 112 contact positions produce, until spacing by shift fork 71.Be positioned at the axle sleeve I 14 at its two ends, the cylindrical of axle sleeve II 16 owing to hold supporting after torsion spring 15 resiliences tightly, make the utility model be in bonding state, the power of engine is delivered to worm screw 6 by belt wheel 4, drive worm gear 13 rotations with its engagement, worm gear 13 rotates by driving axle sleeve I 14 with its axle sleeve I that radially is connected 14, drive axle sleeve II 16 and rotate by torsion spring 15, sliding sleeve 11 again, axle sleeve II 16 drives 1 rotation of fixedly connected with it output shaft, and hay mower is realized from walking.

As shown in Figure 6, after the external force of pulling on-off control mechanism pull bar disappears, under the effect of extension spring 3 elastic forces, clutch swing arm 5 rotates counterclockwise around clutch declutch shaft 7 centers, clutch declutch shaft 7 also rotates counterclockwise, shift fork 71 promotes sliding sleeve 11 and is moved to the left along arrow E direction among Fig. 6, under sliding sleeve 11 endoporus spiral voussoir helicoids 112 promote, angle between the curved pawl 152 of torsion spring 15 and the straight pawl 151 is strutted, torsion spring 15 unclamps the axle sleeve I 14 that originally held tightly, the cylindrical of axle sleeve II 16, the utility model is in released state, worm gear 13 drives axle sleeve I 14 around output shaft 1 rotation, sliding sleeve 11, axle sleeve II 16 and the output shaft 1 of fixedlying connected with axle sleeve II 16 all do not rotate, and hay mower stops from walking.

In addition to the implementation, the utility model can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of the utility model requirement.

Claims

1. a clutch device of output shaft of gear-box for lawn-mower is characterized in that: comprise output shaft, pad, worm screw, worm gear, clutch declutch shaft, extension spring, clutch swing arm, sliding sleeve, axle sleeve I, torsion spring, axle sleeve II, resilient key; Described pad, worm gear, axle sleeve I, torsion spring, axle sleeve II are sleeved on the output shaft successively, and torsion spring set is contained in the sliding sleeve, and its two ends are set on axle sleeve I and the axle sleeve II; The worm and wheel engagement, axle sleeve I is radially fixedlyed connected with worm gear, described axle sleeve II is fixedlyed connected with output shaft by resilient key, described clutch declutch shaft is vertically set on by the axle sleeve II, its shift fork that radially extends is resisted against on the end of axle sleeve II, the upper end of described clutch declutch shaft passes on the casing rear flank fixedlys connected with the clutch swing arm, and clasp joint is at an end of casing upside and clutch swing arm respectively at the two ends of described extension spring, and the other end and the on-off control mechanism of described clutch swing arm are hinged.

2. clutch device of output shaft of gear-box for lawn-mower as claimed in claim 1 is characterized in that: described sliding sleeve endoporus place is provided with convex tendon type helix voussoir, and a side of described helix voussoir is an axial plane, and opposite side is a helicoid.

3. clutch device of output shaft of gear-box for lawn-mower as claimed in claim 2 is characterized in that: the lead angle of described convex tendon type helix voussoir is 40 °～55 °.

4. clutch device of output shaft of gear-box for lawn-mower as claimed in claim 1, it is characterized in that: the two ends of described torsion spring are respectively equipped with straight pawl and curved pawl, described straight pawl is resisted against on the axial plane of sliding sleeve endoporus spiral voussoir one side, and described curved pawl is resisted against on the helicoid of opposite side.

5. clutch device of output shaft of gear-box for lawn-mower as claimed in claim 1 is characterized in that: described axle sleeve I and axle sleeve II are the multidiameter nested structure, and the internal diameter at described torsion spring two ends is set on the opposite end of described axle sleeve I and axle sleeve II.