CN201270648Y

CN201270648Y - Upper transmission case of minitype hoeing machine

Info

Publication number: CN201270648Y
Application number: CNU2008200997744U
Authority: CN
Inventors: 陈万荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-25
Filing date: 2008-08-25
Publication date: 2009-07-15
Anticipated expiration: 2018-08-25

Abstract

The utility model relates to an upper transmission case of a mini-type cultivator. A clutch is positioned outside a case body and is arranged at the outer end of an input shaft, and the inner end of the input shaft stretches into the case body and is supported by a bearing, the lower part of the input shaft is provided with a variable-speed shaft and an intermediate shaft that are parallel with the input shaft, wherein, the shift gear of the variable-speed shaft is meshed with the gear of the input shaft, and the synchronous gear of the variable-speed shaft is meshed with the intermediate gear of the intermediate gear; a first bevel gear is sheathed on the intermediate shaft and is meshed with a second bevel gear at the upper end of a transmission shaft; the transmission shaft is supported on the case body by a bearing, the transmission shaft is vertical to the input shaft, and the lower end of the transmission shaft stretches out of the bottom face of the case body. As the clutch is arranged outside the case body, the transmission case body does not need to be opened during maintenance and replacement, therefore, the operation is simple and convenient, and the on-off stability is good due to no impact force during on-off process. In addition, the upper transmission case has the advantages of small power consumption, strong impact resistance and steady and reliable performance.

Description

Miniature cultivator upper gear box

Technical field

The utility model relates to a kind of miniature cultivator transmission device, relates in particular to the upper gear box of miniature cultivator.

Background technology

At present, the transmission device of miniature cultivator generally is made of power shaft, transmission case and output shaft, transmission mechanism and clutch wherein are installed in the transmission case, and transmission mechanism adopts chain drive or two kinds of forms of full-depth tooth transmission, and clutch works to cut off power in variable block.The weak point that above-mentioned traditional structure exists is:

1, transmission mechanism complex structure, cost are higher, install and maintenance all very difficult.

2, because clutch needs where necessary to safeguard or changes that the mode of built-in clutch must be disintegrated transmission case body and just can be carried out, to operate very loaded down with trivial detailsly, working strength of workers is very big, and wastes time and energy.

3, impulsive force is bigger during clutch, and the less stable of clutch is easy to generate separation not thoroughly or engage problems such as not thorough.

4, adopt chain or multiple sets of teeth to take turns transferring power, kinetic equation loss is bigger, impact resistance is little, when meeting obstructions in the farming, if adopt chain drive to be easy to cause the chain fracture, if adopt all-gear drive to be easy to cause gear to break, the reliability of performance is relatively poor, security incident happens occasionally, when serious even can cause the fatal crass.

The utility model content

Technical problem to be solved in the utility model be to provide a kind of simple in structure, safeguard or change the miniature cultivator upper gear box convenient, that stability is good.

The technical solution of the utility model is as follows: a kind of miniature cultivator upper gear box, comprise casing, power shaft, clutch, shift gear and variable block gear, its key is: described clutch is positioned at the outside of casing, and be installed on the outer end of power shaft, the inner of this power shaft is stretched in the casing, and support by bearing, below power shaft, be provided with parallel with it variable-speed shaft and jackshaft, wherein the variable block gear on the variable-speed shaft can mesh with the shift gear on the power shaft, synchromesh gear on the variable-speed shaft and the engagement of the idler gear on the jackshaft, on jackshaft, also be set with first bevel gear, second bevel gear engagement of this first bevel gear and power transmission shaft upper end, described power transmission shaft is bearing on the casing by bearing, and this power transmission shaft and power shaft are perpendicular, and the bottom surface of casing is stretched out in the lower end of power transmission shaft.

Adopt above technical scheme, the power of engine drives the power shaft rotation by clutch, shift gear on the power shaft is by the rotation of variable block gear driven variable-speed shaft, synchromesh gear on the variable-speed shaft drives jackshaft by idler gear and rotates, and first bevel gear on the jackshaft drives the power transmission shaft rotation by second bevel gear, power transmission shaft is given output shaft by the underdrive case corresponding with upper gear box with transmission of power again, makes the tillage implements running that is connected with output shaft.Clutch is arranged on the outside of upper gear box body, safeguards like this or need not open transmission case body when changing, operate simpler, make things convenient for; Simultaneously, external clutch is in the original position of transmission of power near engine, do not have impulsive force substantially when clutch, and the stability of clutch is good, has effectively eliminated to separate thoroughly or engage problems such as not thorough.Upper and lower transmission case body is as separate mechanism, and is simple in structure, installs and keep in repair all to be easy to, the upper gear box body is by the downward transmission case body transferring power of power transmission shaft, compare with traditional chain drive or full-depth tooth transmission, little, the strong shock resistance of kinetic equation loss, and stable and reliable for performance.

Above-mentioned shift gear and variable block gear are bidentate dish structure, have large and small two different fluted discs separately, shift gear can mesh by the large fluted disc of himself and the small tooth plate of variable block gear selectively, perhaps meshes by the small tooth plate of himself and the large fluted disc of variable block gear.Above structure can change the size of upper gear box body outputting power, adapts to different geographical conditions uses to satisfy mini-size tillage machine.

For the ease of operation, guarantee the reliability of variable block, declutch shift shaft is installed above above-mentioned power shaft, this declutch shift shaft is parallel with power shaft, stretch out from the side of casing the outer end of declutch shift shaft, the sleeve pipe kink of the shift fork that matches with described shift gear by its upper end is on declutch shift shaft, and the fork of shift fork lower end snaps in the annular groove on the shift gear circumference.Shift fork is connected with drag-line mechanism, can drive shift fork slippage on declutch shift shaft by drag-line mechanism, and shift fork is stirred shift gear slippage on power shaft, to change the engagement object of fluted disc between shift gear and the variable block gear.

The beneficial effects of the utility model are:

1, simple in structure, install, safeguard and change easy to operately that working strength of workers is little, and time saving and energy saving.

2, do not have impulsive force during clutch, the stability of clutch is good, has effectively eliminated to separate thoroughly or engage problems such as not thorough.

3, little, the strong shock resistance of kinetic equation loss, and stable performance, safe and reliable, the casualty accident of having avoided the peasant when operation, to cause owing to being short of physical strength.

4, volume is little, and is in light weight, greatly reduces production cost.

5, versatility is very strong, and this upper gear box can need select diesel engine or gasoline engine arbitrarily for use with the client, and variable block be easy to operate, laborsaving according to the different high any coupling power of axle.

Description of drawings

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

Embodiment

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

As shown in Figure 1, the utility model is made of parts such as casing 1, power shaft 2, clutch 3, shift gear 4, variable block gear 5, variable-speed shaft 7, jackshaft 8, synchromesh gear 9, idler gear 10, first bevel gear 11, power transmission shaft 12, second bevel gear 13, declutch shift shaft 15, shift fork 16 and bearings, wherein the clutch 3 that is connected with engine (not drawing among the figure) output is positioned at the outside of casing 1, and be installed on the outer end of power shaft 2, this power shaft 2 is horizontally disposed, the inner of power shaft 2 is stretched into from the top of casing 1, and is bearing on the casing 1 by two bearings 6.Shift gear 4 is positioned at casing 1, and is sleeved on the power shaft 2, and spline is connected between shift gear 4 and the power shaft 2, and shift gear 4 can slippage on power shaft 2.Middle part in described casing 1 and bottom are respectively equipped with variable-speed shaft 7 and jackshaft 8, and variable-speed shaft 7 is all parallel with power shaft 2 with jackshaft 8, and wherein the two ends of variable-speed shaft 7 are bearing on the casing 1 by bearing 17, the middle part suit variable block gear 5 of this variable-speed shaft 7.Described variable block gear 5 and shift gear 4 are bidentate dish structure, have large and small two different fluted discs separately.Declutch shift shaft 15 is installed above power shaft 2, and declutch shift shaft 15 is parallel with power shaft 2, and stretch out from the side of casing 1 outer end of declutch shift shaft 15.The sleeve pipe kink of shift fork 16 upper ends is on declutch shift shaft 15, the fork of shift fork 16 lower ends snaps in the annular groove on shift gear 4 circumference, the middle part of shift fork 16 is connected with drag-line mechanism (not drawing among the figure), can drive shift fork 16 slippage on declutch shift shaft 15 by drag-line mechanism, shift fork 16 is stirred shift gear 4 slippage on power shaft 2, make the small tooth plate engagement of the large fluted disc and the variable block gear 5 of shift gear 4, the perhaps large fluted disc of the small tooth plate of shift gear 4 and variable block gear 5 engagement.

As can be known from Fig. 1, the two ends of jackshaft 8 are bearing on the casing 1 by bearing 18, position at jackshaft 8 two ends near bearing is set with first bevel gear 11 and idler gear 10, wherein idler gear 10 meshes with the synchromesh gear 9 that is installed on the variable-speed shaft 7, and synchromesh gear 9 is positioned at the next door of variable block gear 5.Described power transmission shaft 12 is perpendicular with power shaft 2, and the upper end of power transmission shaft 12 is stretched in the upper gear box body 1 from lower to upper, by bearing 14 supportings, and suit second bevel gear 13, first bevel gear, 11 engagements on this second bevel gear 13 and the jackshaft 8.The lower end of power transmission shaft 12 is stretched in the underdrive casing 19, is connected with output shaft 20 by intermeshing bevel gear, and stretch out respectively outside the underdrive casing 19 at the two ends of output shaft 20, and be connected with tillage implements.

The utility model is work like this:

The power of engine drives power shaft 2 rotations by clutch 3, shift gear 4 on the power shaft 2 drives variable-speed shaft 7 rotations by variable block gear 5, synchromesh gear 9 on the variable-speed shaft 7 drives jackshaft 8 by idler gear 10 and rotates, and first bevel gear 11 on the jackshaft 8 drives power transmission shaft 12 rotations by second bevel gear 13, power transmission shaft 12 is given output shaft 21 with transmission of power, makes the tillage implements running that is connected with output shaft 21.

Claims

1, a kind of miniature cultivator upper gear box, comprise casing (1), power shaft (2), clutch (3), shift gear (4) and variable block gear (5), it is characterized in that: described clutch (3) is positioned at the outside of casing (1), and be installed on the outer end of power shaft (2), the inner of this power shaft (2) is stretched in the casing (1), and by bearing (6) supporting, be provided with parallel with it variable-speed shaft (7) and jackshaft (8) in the below of power shaft (2), wherein the variable block gear (5) on the variable-speed shaft (7) can mesh with the shift gear (4) on the power shaft (2), idler gear (10) engagement on synchromesh gear (9) on the variable-speed shaft (7) and the jackshaft (8), on jackshaft (8), also be set with first bevel gear (11), this first bevel gear (11) meshes with second bevel gear (13) of power transmission shaft (12) upper end, described power transmission shaft (12) is bearing on the casing (1) by bearing (14), this power transmission shaft (12) is perpendicular with power shaft (2), and the bottom surface of casing (1) is stretched out in the lower end of power transmission shaft (12).

2, miniature cultivator upper gear box according to claim 1, it is characterized in that: described shift gear (4) and variable block gear (5) are bidentate dish structure, have large and small two different fluted discs separately, shift gear (4) can mesh by the large fluted disc of himself and the small tooth plate of variable block gear (5) selectively, perhaps meshes by the small tooth plate of himself and the large fluted disc of variable block gear (5).

3, miniature cultivator upper gear box according to claim 2, it is characterized in that: declutch shift shaft (15) is installed in the top of described power shaft (2), this declutch shift shaft (15) is parallel with power shaft (2), stretch out from the side of casing (1) outer end of declutch shift shaft (15), the sleeve pipe kink of the shift fork (16) that matches with described shift gear (4) by its upper end is on declutch shift shaft (15), and the fork of shift fork (16) lower end snaps in the annular groove on shift gear (4) circumference.