CN103836086A - Normally-opened clutch system of hand type walking machine - Google Patents
Normally-opened clutch system of hand type walking machine Download PDFInfo
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- CN103836086A CN103836086A CN201410115812.0A CN201410115812A CN103836086A CN 103836086 A CN103836086 A CN 103836086A CN 201410115812 A CN201410115812 A CN 201410115812A CN 103836086 A CN103836086 A CN 103836086A
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Abstract
The invention discloses a normally-opened clutch system of a hand type walking machine. The normally-opened clutch system comprises a walking machine body, a clutch operating handle, a clutch handle seat, a clutch inhaul cable, an inhaul cable sleeve, a clutch shift shaft arm assembly, a clutch shifting fork, a normally-opened clutch assembly, an energy storage device and a forced normally-opened damping differential mechanism. The clutch handle seat is installed on the handrail of the walking machine body. The clutch operating handle is connected to the clutch handle seat in a rotating mode. The clutch operating handle is made of a metal plate through pressing forming. The energy storage device is arranged on the walking machine body. The forced normally-opened damping differential mechanism is arranged on a main shaft. When the normally-opened clutch assembly is pushed by a release spring to be in an opening state, the clutch shifting fork can be pushed to drive a locking push disk to move towards a locking friction disk. The normally-opened clutch system is high in stability, low in danger coefficient and good in operating comfort.
Description
Technical field
The present invention relates to a kind of walk-behind type running machine, relate in particular to the clutch system open in usual of a kind of walk-behind type running machine (Work machine) use.
Background technique
Clutch is totally divided into two kinds: Normally closed type and open in usual.In (walking) class matured product, all use at present Normally closed type clutch (as: automobile, motorcycle, tractor and all kinds of big-and-middle-sized portable agricultural operation machineries etc.) moving, the common ground of such product operation is man-machine entirety colleague (car), only have machine to stop row, man-machine ability safe separating, therefore the movement of machine all operates under control and carries out personnel.And this clutch mode is when for Miniature walking mobile operation machine; but there is a fatal safety defect; because such Work machine mode of operation is the hand steered colleague of human locomotion; when occurring man-machine very easily separation under the unusual condition that personnel have little time to shut down; now; use the machine of Normally closed type clutch not depart from power transmission; and man-machinely separate; machine will move operating continuation unordered under the state of control without personnel, and such runaway condition forms serious security threat to personnel and material property around.
Use clutch mode open in usual can thoroughly avoid above-mentioned security threat, but two kinds of ripe normally open clutch exist the narrow limitation of application area, one is electromagnetic type clutch; Another kind is centrifugal clutching, because portable power source mechanism huge and continuous service time is of short duration etc., factor only limits to non-moving machine (as: lathe of fixed position etc.) to electromagnetic type clutch mode, centrifugal clutching mode is because driving torque is non-constant with rotation speed change, and application is also limited to.And another kind hold vertical compression normally open clutch due to not through grip energy storage conversion load subtract to, hand-held operation is required great effort very much, without actual application value.Therefore in the urgent need to a kind of hand guided mechanical normally open clutch and control operation system applies in such Work machine, conscientiously realize hand from the secure mode of operation of stopping.
Summary of the invention
For prior art above shortcomings, object of the present invention be just to provide a kind of by energy storage change load subtract to, highlight the clutch system open in usual of the walk-behind type running machine of easy manipulation and Security, can effectively solve existing running machine poor stability, risk factor is high, the defect that operational comfort is low.
To achieve these goals, the technical solution used in the present invention is such: a kind of clutch system open in usual of walk-behind type running machine, comprises running machine body, clutch operating handle, clutch handle seat, clutch cable, cable sleeve, clutch yoke armshaft assembly, clutch yoke, normally open clutch assembly, energy storage device and force often to open damping differential mechanism; Described running machine body has handrail, gear graduation transmission case, motor and walking wheel, described normally open clutch assembly is installed in the gear graduation transmission case of running machine body, and the engine output shaft on running machine body is connected with main shaft coaxial line after this normally open clutch assembly; Described clutch yoke armshaft assembly comprises the axostylus axostyle of clutch arm and clutch arm one end, and the other end of described clutch arm is connected with cable sleeve; Described axostylus axostyle is mutually vertical with clutch arm, and this axostylus axostyle is fixedly connected with clutch yoke by bearing pin after running through clutch yoke, and the two ends of described axostylus axostyle and gear graduation transmission case are rotationally connected, and two fork pin of described clutch yoke are positioned at the both sides of main shaft; Described clutch handle seat is installed on the handrail of running machine body, clutch operating handle is rotatably connected on clutch handle seat, the two ends of described cable sleeve are respectively equipped with a drag-line seat, wherein, the drag-line seat of cable sleeve one end is fixedly connected with clutch handle seat, and the drag-line seat of the other end and clutch yoke armshaft assembly are rotationally connected away from one end of clutch yoke; It is characterized in that:
Described clutch operating handle, by sheet metal impact briquetting, make formation one bar shaped abdominal cavity in clutch operating handle, and one end that clutch operating handle is connected with handrail is run through in this abdominal cavity;
In walking machine body, be also provided with an energy storage device, described energy storage device comprises the energy storage spring between energy storage spring fixed base, energy storage spring telescopic stand and energy storage spring fixed base and energy storage spring telescopic stand; In the abdominal cavity of clutch operating handle, be provided with clutch lacing wire pin, one end of described clutch cable is connected with clutch lacing wire pin, and the other end is successively through being connected together with energy storage spring telescopic stand after Guy wire guide-tube, energy storage spring fixed base, energy storage spring;
On main shaft, be also provided with a pressure and often drive damping differential mechanism, and the both sides of clutch yoke are often opened damping differential mechanism and normally open clutch and laid respectively in this pressure; Described pressure is often driven damping differential mechanism and is comprised stop push-plate and stop friction disk, described stop friction disk have with main shaft on the internal spline that matches of external splines, this stop friction disk is fixedly connected with by spline fitted with main shaft; Described stop push-plate is positioned at pressure and often opens the side of damping differential mechanism near clutch yoke, in the time that normally open clutch assembly is promoted to enter open mode by release spring, can promote clutch yoke and drive stop push-plate to move towards stop friction disk direction.
Further, described stop friction disk and stop push-plate are all T-shaped nested structure, and stop push-plate is set on stop friction disk.
Further, the described stop push-plate both sides corresponding with the fork foot of shift fork are flat side's tangent plane structure, and this flat side's tangent plane structure is placed in the fork pin of clutch yoke, rotate in the time that stop is worked thereby can limit stop push-plate.
Compared with prior art, tool of the present invention has the following advantages:
1. being provided with clutch lacing wire pin in clutch operating handle abdominal cavity draws and moves starting point as clutch cable, press down in the process that clutch cable pulls holding, a variable perpendicular to the component on clutch operating handle, and diminish gradually, thereby make to be more prone in the process of holding with a firm grip, and do not need too large grip in the process of clutch operating handle of holding with a firm grip;
2. energy storage spring pulls the compressive strain of displacement process medi-spring at clutch cable, load is along with compression deformation of the spring increases gradually, it is overlapping that the holding of this process and clutch operating handle presses down the process that component diminishes gradually, form power that two stressed trend is contrary overlapping subtract to, thereby the actual grip of clutch operating handle is diminished and without obviously rising and falling, in the clutch handle process of holding with a firm grip, exert oneself more steady; And actual grip when clutch is closed on clutch operating handle is less than the grip while starting to hold with a firm grip, conscientiously guarantee the slim and graceful, level and smooth and even of feel grip, operate the comfortable fatigue of not feeling, tool is practicability widely;
3. force often to open the energy storage spring off-load under the luxuriant closing operation handle of hand state of damping differential mechanism, release spring oppositely promotes clutch yoke and returns, drive stop push-plate to move and produce backpressure F3 towards stop friction disk direction, thereby after formation and the transmission of running machine disengaging motor, retain a reverse friction differential of inertia rotating speed, realize forcing to remove and retain inertia rotating speed, guarantee that separate men from machines hand, from stopping, thoroughly overcomes potential safety hazard, social benefit is remarkable.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of normally open clutch assembly;
Fig. 3 is the mounting structure schematic diagram of clutch operating handle;
Fig. 4 is the structural representation of energy storage device;
Fig. 5 is for forcing often to open damping differential mechanism structural representation;
Fig. 6 is the left view of Fig. 5;
Fig. 7 is the assembly structure schematic diagram of clutch operating handle, clutch yoke, clutch yoke armshaft assembly and energy storage device.
In figure: 1-clutch operating handle, 2-clutch handle seat, 3-clutch cable, 4-cable sleeve, 41-drag-line seat, 5-clutch yoke armshaft assembly, 6-clutch yoke, 7-normally open clutch assembly, 71-clutch housing, 72-flower keyboard, 73-friction plate, the outer square tooth driven hub of 74-clutch, 75-internal moment tooth driven plate, 76-clutch lift slab, 77-clutch internal moment tooth pallet, 78-release spring, 79-clutch pad, 8-energy storage device, 81-energy storage spring fixed base, 82-energy storage spring telescopic stand, 83-energy storage spring, 9-main shaft, 101-stop friction disk, 102-stop push-plate.
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Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment: referring to Fig. 1 to Fig. 7, a clutch system open in usual for walk-behind type running machine, comprises running machine body, clutch operating handle 1, clutch handle seat 2, clutch cable 3, cable sleeve 4, clutch yoke armshaft assembly 5, clutch yoke 6, normally open clutch assembly 7, energy storage device 8 and forces often to open damping differential mechanism.Described running machine body has handrail, gear graduation transmission case, motor and walking wheel, described normally open clutch assembly 7 is installed in the gear graduation transmission case of running machine body, the engine output shaft on running machine body after this normally open clutch assembly 7 with main shaft 9(driven shaft) coaxial line is connected.
Described normally open clutch assembly 7 comprises clutch housing 71 assemblies, clutch pad 79, clutch internal moment tooth pallet 77, release spring 78, friction plate 73, internal moment tooth driven plate 75, clutch lift slab 76, the outer square tooth driven hub 74 of clutch, bearing sleeve and one direction thrust bearing.Described clutch housing 71 assemblies comprise clutch housing 71 and flower keyboard 72, and it was connected together by the internal spline on flower keyboard 72 and the coordinating of external splines on engine output shaft; On the housing of described clutch housing 71, axially offer several long strip teeth groove (being generally 8) along it, and described long strip teeth groove is uniformly distributed around clutch housing for 71 1 weeks; Described friction plate 73 is multi-disc, its outward edge have with clutch housing 71 on the outer square tooth that matches of long strip teeth groove; Friction plate 73 is cooperatively interacted and is linked together by the long strip teeth groove of outer square tooth and clutch housing 71, and friction plate 73 can move back and forth along long strip teeth groove.The outer square tooth driven hub 74 of described clutch and main shaft 9(driven shaft in running machine body) by being slidably connected internal spline and coordinating of external splines, outside clutch in square tooth driven hub 74 outside it is axially arranged with several double wedge; The internal spline that the outer double wedge of described clutch internal moment tooth pallet 77 inner edges square tooth driven hub 74 outside it is axially arranged with several and clutch matches, and the outer double wedge of the outer square tooth driven hub 74 of clutch can move back and forth along internal spline; Described internal moment tooth driven plate 75 is also multi-disc, and be alternately distributed with friction plate 73, its inside edge have with the outer square tooth driven hub 74 of clutch on the internal moment tooth that matches of outer double wedge, internal moment tooth driven plate 75 is cooperatively interacted and is linked together by the outer double wedge of internal moment tooth and the outer square tooth driven hub 74 of clutch, and internal moment tooth driven plate 75 can come and go along outer double wedge mobile.The outer square tooth driven hub 74 of described clutch lift slab 76 and clutch is connected by screw fastening, and is fastenedly connected with bearing sleeve and one direction thrust bearing in the lump pressing.Described clutch internal moment tooth pallet 77 is connected with clutch lift slab 76 by bearing pin and wild card; Described release spring 78 is many, and between clutch lift slab 76 and clutch internal moment tooth pallet 77; When concrete enforcement, described clutch internal moment tooth pallet 77 has several directional posts, and described directional post is through the outer square tooth driven hub 74 of clutch, and release spring 78 is set on described directional post, and its two ends are connected with clutch lift slab 76 with clutch internal moment tooth pallet 77 respectively.Described clutch pad 79 between clutch housing 71 and clutch internal moment tooth pallet 77, and by bolt and deep groove ball bearing and main shaft 9(driven shaft on running machine body) be fixedly connected with.
Described clutch yoke armshaft assembly 5 comprises the axostylus axostyle of clutch arm and clutch arm one end, and the other end of described clutch arm is connected with cable sleeve 4; Described axostylus axostyle is mutually vertical with clutch arm, and this axostylus axostyle is fixedly connected with clutch yoke 6 by bearing pin after running through clutch yoke 6, and the two ends of described axostylus axostyle and gear graduation transmission case are rotationally connected, and two fork pin of described clutch yoke 6 are positioned at the both sides of main shaft 9.In the time that cable sleeve 4 drives clutch yoke armshaft assembly 5 around spindle rotation, clutch yoke 6 is synchronously rotated with clutch yoke armshaft assembly 5, and can promote normally open clutch assembly 7 closures.
Described clutch handle seat 2 is installed on the handrail of running machine body, clutch operating handle 1 is rotatably connected on clutch handle seat 2, the two ends of described cable sleeve 4 are respectively equipped with a drag-line seat 41, wherein, the drag-line seat 41 of cable sleeve 4 one end is fixedly connected with clutch handle seat 2, and drag-line seat 41 and the clutch yoke armshaft assembly 5 of the other end are rotationally connected away from one end of clutch yoke 6.Described clutch operating handle 1, by sheet metal impact briquetting, make the interior formation of clutch operating handle 1 one bar shaped abdominal cavity, and one end that clutch operating handle 1 is connected with handrail is run through in this abdominal cavity; When concrete enforcement, this clutch operating handle 1 is by a trapezoidal sheet metal impact briquetting.
In walking machine body, be also provided with an energy storage device 8, described energy storage device 8 comprises the energy storage spring 83 between energy storage spring fixed base 81, energy storage spring telescopic stand 82 and energy storage spring fixed base 81 and energy storage spring telescopic stand 82; Described energy storage spring fixed base 81 is fixedly connected with running machine body by bolt, energy storage spring telescopic stand 82 is positioned under energy storage spring fixed base 81, thereby energy storage spring 83 is vertically arranged between energy storage spring telescopic stand 82 and energy storage spring fixed base 81.Be provided with clutch lacing wire pin in the abdominal cavity of clutch operating handle 1, one end of described clutch cable 3 is connected with clutch lacing wire pin, and the other end passes Guy wire guide-tube, energy storage spring fixed base 81, energy storage spring 83 afterwards successively and energy storage spring telescopic stand 82 is connected together.
On main shaft 9, be also provided with a pressure and often drive damping differential mechanism, and the both sides of clutch yoke 6 are often opened damping differential mechanism and normally open clutch and laid respectively in this pressure.Described pressure is often driven damping differential mechanism and is comprised stop push-plate 102 and stop friction disk 101, described stop friction disk 101 have with main shaft 9 on the internal spline that matches of external splines, this stop friction disk 101 is fixedly connected with by spline fitted with main shaft 9; Described stop push-plate 102 is positioned at pressure and often opens the side of damping differential mechanism near clutch yoke 6, in the time that normally open clutch assembly 7 is promoted to enter open mode by release spring 78, can promote clutch yoke 6 and drive stop push-plate 102 to move towards stop friction disk 101 directions.Described stop friction disk 101 is rubbing surface near a side of stop push-plate 102, thereby produces friction when stop push-plate 102 and stop friction disk 101 are fitted.
Described stop friction disk 101 is all T-shaped nested structure with stop push-plate 102, and stop push-plate 102 is set on stop friction disk 101; When concrete enforcement, push-plate is arranged on stop friction disk 101 by jump ring automatically, and stop push-plate 102 can moving axially along stop friction disk 101.Described stop push-plate 102 both sides corresponding with the fork foot of shift fork are flat side's tangent plane structure, and this flat side's tangent plane structure is placed in the fork pin of clutch yoke 6, rotate in the time that stop is worked thereby can limit stop push-plate 102.
Closing course:
1. running machine is placed in to random shift (being conventionally placed in neutral), ato unit, now friction plate and internal moment tooth driven plate normally open in separating under the effect of release spring, friction plate no-load idle running under clutch housing drives simultaneously;
2. running machine is placed in to required gear, pinches lower clutch operating handle, clutch cable pulls displacement compressed energy-storage spring energy-storage;
3. because the length of cable sleeve is fixed, therefore, when spring-compressed energy storage, cable sleeve clutch yoke armshaft assembly is rotated down moving;
4. clutch yoke armshaft assembly drives clutch yoke to rotate, make clutch yoke promote the outer square tooth driven hub of single direction thrust ball bearing, clutch lift slab and clutch, and then compress release spring simultaneously, make global displacement, and force the outer square tooth driven hub of clutch to compress internal moment tooth driven plate and friction plate;
5. after friction plate and internal moment tooth driven plate pressurized, laminating produces friction torque, now engine output shaft drives the rotation of clutch housing assembly, clutch housing is rotated by housing rectangle groove and friction plate edge rectangular teeth band movable friction plate and internal moment tooth driven plate, internal moment tooth driven plate drives the outer square tooth driven hub rotation of clutch, the outer square tooth driven hub of clutch drives main shaft (driven shaft) rotation by internal spline, and normally open clutch closure completes.
Normal open procedure:
1. running machine body sets about to leave after clutch operating handle at walking job state, energy storage spring off-load, the stressed disappearance of clutch yoke armshaft assembly;
2. release spring promotion clutch lift slab, the outer square tooth driven hub of clutch, single direction thrust ball bearing entirety move to clutch yoke direction, and drive clutch yoke to rotate backward;
3. friction plate separates with internal moment tooth driven plate decompression, friction torque off-load, and friction plate is no-load idle running under clutch housing drives;
Rotate backward and in process, promote stop push-plate and move towards stop friction disk direction in clutch yoke, make stop push-plate laminating stop friction disk produce a friction torque and form reverse friction differential, thereby realize damping stop, running machine body is out of service, thereby realize hand from stopping.
Finally it should be noted that, above embodiment is only in order to illustrate technological scheme of the present invention but not restriction technologies scheme, those of ordinary skill in the art is to be understood that, those are modified or are equal to replacement technological scheme of the present invention, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. a clutch system open in usual for walk-behind type running machine, comprises running machine body, clutch operating handle, clutch handle seat, clutch cable, cable sleeve, clutch yoke armshaft assembly, clutch yoke, normally open clutch assembly, energy storage device and forces often to open damping differential mechanism; Described running machine body has handrail, gear graduation transmission case, motor and walking wheel, described normally open clutch assembly is installed in the gear graduation transmission case of running machine body, and the engine output shaft on running machine body is connected with main shaft coaxial line after this normally open clutch assembly; Described clutch yoke armshaft assembly comprises the axostylus axostyle of clutch arm and clutch arm one end, and the other end of described clutch arm is connected with cable sleeve; Described axostylus axostyle is mutually vertical with clutch arm, and this axostylus axostyle is fixedly connected with clutch yoke by bearing pin after running through clutch yoke, and the two ends of described axostylus axostyle and gear graduation transmission case are rotationally connected, and two fork pin of described clutch yoke are positioned at the both sides of main shaft; Described clutch handle seat is installed on the handrail of running machine body, clutch operating handle is rotatably connected on clutch handle seat, the two ends of described cable sleeve are respectively equipped with a drag-line seat, wherein, the drag-line seat of cable sleeve one end is fixedly connected with clutch handle seat, and the drag-line seat of the other end and clutch yoke armshaft assembly are rotationally connected away from one end of clutch yoke; It is characterized in that:
Described clutch operating handle, by sheet metal impact briquetting, make formation one bar shaped abdominal cavity in clutch operating handle, and one end that clutch operating handle is connected with handrail is run through in this abdominal cavity;
In walking machine body, be also provided with an energy storage device, described energy storage device comprises the energy storage spring between energy storage spring fixed base, energy storage spring telescopic stand and energy storage spring fixed base and energy storage spring telescopic stand; In the abdominal cavity of clutch operating handle, be provided with clutch lacing wire pin, one end of described clutch cable is connected with clutch lacing wire pin, and the other end is successively through being connected together with energy storage spring telescopic stand after Guy wire guide-tube, energy storage spring fixed base, energy storage spring;
On main shaft, be also provided with a pressure and often drive damping differential mechanism, and the both sides of clutch yoke are often opened damping differential mechanism and normally open clutch and laid respectively in this pressure; Described pressure is often driven damping differential mechanism and is comprised stop push-plate and stop friction disk, described stop friction disk have with main shaft on the internal spline that matches of external splines, this stop friction disk is fixedly connected with by spline fitted with main shaft; Described stop push-plate is positioned at pressure and often opens the side of damping differential mechanism near clutch yoke, in the time that normally open clutch assembly is promoted to enter open mode by release spring, can promote clutch yoke and drive stop push-plate to move towards stop friction disk direction.
2. the clutch system open in usual of a kind of walk-behind type running machine according to claim 1, is characterized in that: described stop friction disk and stop push-plate are all T-shaped nested structure, and stop push-plate is set on stop friction disk.
3. the clutch system open in usual of a kind of walk-behind type running machine according to claim 1 and 2, it is characterized in that: the described stop push-plate both sides corresponding with the fork foot of shift fork are flat side's tangent plane structure, this flat side's tangent plane structure is placed in the fork pin of clutch yoke, rotates in the time that stop is worked thereby can limit stop push-plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115812.0A CN103836086B (en) | 2014-03-26 | 2014-03-26 | A kind of clutch system open in usual of walk-behind type running machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115812.0A CN103836086B (en) | 2014-03-26 | 2014-03-26 | A kind of clutch system open in usual of walk-behind type running machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103836086A true CN103836086A (en) | 2014-06-04 |
| CN103836086B CN103836086B (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410115812.0A Expired - Fee Related CN103836086B (en) | 2014-03-26 | 2014-03-26 | A kind of clutch system open in usual of walk-behind type running machine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08275628A (en) * | 1995-04-06 | 1996-10-22 | Mitsubishi Agricult Mach Co Ltd | Multilane rice transplanter |
| DE102008018541A1 (en) * | 2008-04-12 | 2009-10-15 | Deere & Company, Moline | Combination of an agricultural implement and a carrier or towing vehicle with a sensor for detecting the opening state of a cover and an automatic shutdown of the PTO shaft |
| CN201995308U (en) * | 2011-04-15 | 2011-10-05 | 严华 | Guy cable device capable of converting normally-closed clutch into normally-opened clutch |
| CN102405703A (en) * | 2011-08-02 | 2012-04-11 | 重庆威马农业机械有限公司 | Power control structure of minitiller and safety device thereof |
| CN203730598U (en) * | 2014-03-26 | 2014-07-23 | 重庆集氏科技有限公司 | Normally-open clutch system of hand-held walking machine |
-
2014
- 2014-03-26 CN CN201410115812.0A patent/CN103836086B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08275628A (en) * | 1995-04-06 | 1996-10-22 | Mitsubishi Agricult Mach Co Ltd | Multilane rice transplanter |
| DE102008018541A1 (en) * | 2008-04-12 | 2009-10-15 | Deere & Company, Moline | Combination of an agricultural implement and a carrier or towing vehicle with a sensor for detecting the opening state of a cover and an automatic shutdown of the PTO shaft |
| CN201995308U (en) * | 2011-04-15 | 2011-10-05 | 严华 | Guy cable device capable of converting normally-closed clutch into normally-opened clutch |
| CN102405703A (en) * | 2011-08-02 | 2012-04-11 | 重庆威马农业机械有限公司 | Power control structure of minitiller and safety device thereof |
| CN203730598U (en) * | 2014-03-26 | 2014-07-23 | 重庆集氏科技有限公司 | Normally-open clutch system of hand-held walking machine |
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| Publication number | Publication date |
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| CN103836086B (en) | 2015-12-02 |
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