CN100516589C - Longitudinal transmission device of small wheeled tractor - Google Patents

Abstract

The invention discloses a longitudinally arranged drive for a small wheel type tractor, which employs a step mechanical drive arranged longitudinally. A built-in externally-engaged gear drives finally; and 8 forward and 4 reverse steps, 540 r/min, 720 r/min and 1000 r/min output speeds are available. The front and the rear connection size of the drive are designed as for a crossly-arranged gear box of a small 4-wheel tractor, the reducer and the half axle assembly of the small 4-wheel tractor can be installed. The invention fundamentally solves the problem of poor reliability with a small 4-wheel tractor when the power is up to 20 hp, and is of high market competitiveness.

Description

Vertically arranged transmission device of minitype wheeled tractor

(1) technical field

The invention belongs to the tractor field, relate to a kind of vertically arranged transmission device of minitype wheeled tractor.

(2) background technique

Present domestic small-power (18.4kW following) wheeled tractor can be divided into two kinds of belt transmission and direct transmissions according to the difference of transmission structures.The outstanding feature of belt transmission tractor with small four wheels is that the horizontal single cylinder diesel of employing, gearbox are horizontal, pass through the belt transferring power between diesel engine and the gearbox, rear axle directly inserts in the horizontal gearbox simultaneously, there is not final transmission, power output has only a kind of rotating speed, changes very difficulty of output speed.Driving gear lateral arrangement in this kind of drive gearbox, simple in structure, but transmission efficiency is low, exerts oneself inconvenience about needing during gear shift.Pi Pei one-cylinder diesel engine oil consumption height, vibration and noise is big simultaneously, discharging is relatively poor, along with the enforcement of national Abgasgesetz, is in the edge that is eliminated.But because the belt transmission tractor with small four wheels is with low cost, realize socialization production fully, also have sizable customers, the annual production and marketing of China is about 1,000,000.Directly the transmission wheel type tractor adopts vertical multi-cylinder diesel engine, and the vibration and the noise of diesel engine are lower, have the characteristics of low oil consumption, low emission simultaneously, meet industrial development direction.Directly the transmission Tractor Power Train mainly contains several big assemblies formations such as clutch, gearbox, back axle, final transmission, is interconnected to a firm integrated support tractor weight by several cast housings simultaneously.Its gearbox is a longitudinal, and major and minor speed change two axles up and down is arranged in the vertical vertical plane of tractor, adopts sliding gear or collar shift more, is 6+2 shelves or 8+4 shelves; Central authorities' transmission is used the secondary break-in of a pair of cone gear to increase and is turned round, and bevel gear wheel is installed on the differential mechanism usually; Internal or external externally-engaged cylindrical gear or planetary mechanism are adopted in final transmission; Pto can have multiple rotating speeds such as 540 rev/mins, 720 rev/mins and 1000 rev/mins.With respect to the horizontal structure of bel-drivenn, direct drive longitudinal kind of drive intensity is good, can satisfy the power requirements than broad, and the transmission efficiency height is realized more gear easily, and job area is wide relatively.But direct transmission manufacture cost height, this just causes with the direct transmission tractor price of constant power more much higher than belt transmission tractor, is seriously restricting the expansion of its sales volume.

(3) summary of the invention

The object of the present invention is to provide a kind of simple in structure, compact, transmission efficiency is high, cost is cheap relatively vertically arranged transmission device of minitype wheeled tractor.

Technological scheme of the present invention is: vertically arranged transmission device of minitype wheeled tractor mainly comprises gear box casing, one, driven shaft, small coning gear shaft, large conical gear, final transmission gear axle, reverse gear shaft, differential mechanism, final transmission driven gear, power output driving shaft, power output transition gear, power output intermediate gear, power output driving gear, power output driven gear, power output idler shaft, pto.Wherein, one is arranged in the vertical symmetry plane of gear box casing and by spline housing with power output driving shaft and links together; Small coning gear shaft but departs from the vertical symmetry plane certain distance of gear box casing below one, driven shaft is supported on the small coning gear shaft by needle bearing; On the gear box casing bi-side, differential mechanism is arranged in final transmission gear axle lower right to final transmission gear axle by bearings, and its axis is parallel with final transmission gear axle; 3 axles and 4 gears are vertically arranged in the gear box casing rear portion, be power output driving shaft and power output transition gear above, the centre is that power output idler shaft and power output intermediate gear, power are exported driving gear, be pto and power output driven gear below, its medium power output transition gear is installed on the power output driving shaft, power output intermediate gear and power output driving gear are fixedly mounted on the power output idler shaft, and power output driven gear is installed on the pto.

Large conical gear is fixedly mounted on the final transmission gear axle, and is meshed with small coning gear shaft; Final transmission driven gear and differential mechanism join together by bolt, and are meshed with final transmission gear axle.Large conical gear is a helical bevel gear, and final transmission driven gear is a helical gear.

Power output transition gear can slide to the right under the effect of external force with the engagement of power output intermediate gear, and power output driving gear and power output driven gear often mesh.

The present invention can reach following good effect: small coning gear shaft departs from vertical symmetry plane certain distance and arranges, make differential mechanism identical with the horizontal transmission case of belt transmission tractor with small four wheels apart from the distance of left and right side, thereby the semiaxis of former belt transmission tractor with small four wheels and semiaxis housing can be used fully, simultaneously with final transmission lateral arrangement before differential mechanism, the conventional relatively vertical layout of putting, simplify final transmission, saved a pair of final transmission and correlated parts, significantly reduced manufacture cost.Power output intermediate gear and power output driving gear are fixedly mounted on the power output idler shaft, having changed former belt transmission tractor with small four wheels pto can only have a kind of present situation of rotating speed, by changing the gear of the different numbers of teeth, can realize 540 rev/mins, 720 rev/mins and 1000 rev/mins of multiple rotating speeds.The Conncetion cimension of gear box casing front-end face and upper-end surface designs by the horizontal gearbox of belt transmission tractor with small four wheels, thereby the speed reducer assembly of belt transmission tractor with small four wheels and lifter assembly are used.Simultaneously this transmission device gearbox adopts longitudinal to arrange, has reduced transmission link, has improved transmission efficiency, has fundamentally solved the defective of back poor reliability more than the horizontal chassis of the belt transmission tractor with small four wheels power ascension to 20 horsepower.

(4) description of drawings

Fig. 1 is the main sectional view of vertically arranged transmission device of the present invention.

Fig. 2 is the left sectional view of vertically arranged transmission device of the present invention.

Fig. 3 is the fragmentary top sectional view of vertically arranged transmission device of the present invention.

(5) embodiment

As Fig. 1, Fig. 2, vertically arranged transmission device of minitype wheeled tractor shown in Figure 3, comprise III-IV shelves driving gear 1, IV shelves driven gear 2, III shelves driven gear 3, I-II shelves driving gear 4, II shelves driven gear 5, I shelves driven gear 6, one-level deceleration driving gear 8, one-level deceleration driven gear shaft 7, double reduction driving gear 9, double reduction driven gear 10, reverse idler gear 11, reverse gear driven gear 12, small coning gear shaft 13, large conical gear 14, final transmission gear axle 15, differential mechanism 16, final transmission driven gear 17, power output transition gear 18, power output intermediate gear 19, power output driving gear 20, power output driven gear 21, one 22, driven shaft 23, reverse gear shaft 24, power output driving shaft 25, power output idler shaft 26, pto 27, main parts size such as gear box casing 28, wherein large conical gear 14 is combined into an integral body with final transmission gear axle 15, differential mechanism 16 is combined into an integral body with final transmission driven gear 17, and double reduction driving gear 9 is combined into an integral body with one-level deceleration driven gear shaft 7.

The transmission device front half part is major and minor speed-change area, 4 axles have vertically been arranged among Fig. 1,2 from top to bottom, be one 22 above, be arranged in gear box casing 28 vertical symmetry planes, small coning gear shaft 13 is below one 22, but depart from gear box casing 28 vertical symmetry plane certain distances, driven shaft 23 is supported on the small coning gear shaft 13 for hollow shaft and by needle bearing.Reverse gear shaft 24 is arranged between one-level deceleration driven gear shaft 7 and the small coning gear shaft 13.Wherein one 22, driven shaft 23 and III-IV shelves driving gear 1, IV shelves driven gear 2, III shelves driven gear 3, I-II shelves driving gear 4, II shelves driven gear 5, I shelves driven gear 6, one-level deceleration driving gear 8, one-level deceleration driven gear shaft 7 are formed main speed-change area, and small coning gear shaft 13, reverse gear shaft 24 and double reduction driving gear 9, double reduction driven gear 10, reverse idler gear 11, reverse gear driven gear 12 constitute secondary speed-change area.

The transmission device intermediate portion is central authorities and terminal drive area, among Fig. 3 final transmission gear axle 15 by bearings on gear box casing 28 bi-side, differential mechanism 16 is arranged in final transmission gear axle 15 lower rights, its axis is parallel with final transmission gear axle 15, large conical gear 14 is fixedly mounted on the final transmission gear axle 15, and final transmission driven gear 17 is connected on the differential mechanism 16 by bolt.

The transmission device latter half part is the power output area, can vertically arrange 3 axles and 4 gears among Fig. 1 from top to bottom, be above power output driving shaft 25 and power output transition gear 18, centre be power output idler shaft 26 and power output intermediate gear 19, power output driving gear 20, below be pto 27 and power output driven gear 21.

Engine power is through clutch, by one 22 input, respectively through the III-IV of main speed-change area shelves driving gear 1, IV shelves driven gear 2, III shelves driven gear 3, I-II shelves driving gear 4, II shelves driven gear 5,6 combinations of I shelves driven gear obtain four main transformer speed gears, again by one-level deceleration driving gear 8, one-level deceleration driven gear shaft 7, double reduction driving gear 9, double reduction driven gear 10, reverse idler gear 11, reverse gear driven gear 12 grades are formed two forward gearss and backward gear of secondary speed change, and are main, the gear of secondary speed change interosculates and can constitute 8 forward gearss and 4 backward gears.Power from the different gears of gearbox after small coning gear shaft 13 enters central authorities, terminal drive area, slow down and 90 degree commutations by the large conical gear 14 that is installed on the final transmission gear axle 15 earlier, upload on the final transmission driven gear 17 by final transmission gear axle 15 again, finally will be exported through left and right sides semiaxis respectively after the power distribution by differential mechanism 16, the driving tractor advances or retreats.

When power output transition gear 18 slides to the right when power is exported intermediate gear 19 and is meshed, the power of motor can be exported driving shaft 25 through power, power output transition gear 18 passes on the power output idler shaft 26, export by pto 27 by power output driving gear 20, power output driven gear 21 again, realize rearmounted power output; By different number of teeth power output driving gears 20 and the power output driven gear 21 of changing the outfit, can obtain multiple rotating speeds such as 540 rev/mins, 720 rev/mins, 1000 rev/mins.

Claims (4)

1. A vertical transmission device for a small wheeled tractor, mainly comprising a gearbox housing (28), a shaft (22), a driven shaft (23), a small bevel gear shaft (13), a large bevel gear (14 ), final drive drive gear shaft (15), differential (16), final drive driven gear (17), PTO drive shaft (25), PTO transition gear (18), PTO intermediate gear (19), Power output driving gear (20), power output driven gear (21), power output idler shaft (26), power output shaft (27), is characterized in that: a shaft (22) and power output driving shaft (25) arrangement In the longitudinal symmetry plane of the gearbox housing (28), they are connected together by spline sleeves; the pinion bevel gear shaft (13) is below the first shaft (22), but deviates from the longitudinal symmetry plane of the gearbox housing (28) for a certain distance , the driven shaft (23) is supported on the pinion bevel gear shaft (13) through needle bearings; the final drive driving gear shaft (15) is supported on both sides of the gearbox housing (28) through bearings, and the differential (16 ) is arranged at the bottom right of the final drive driving gear shaft (15), and its axis is parallel to the final drive driving gear shaft (15); 3 shafts and 4 gears are longitudinally arranged at the rear of the gearbox housing (28), and the upper part is the power output The driving shaft (25) and the power output transition gear (18), the middle is the power output idler shaft (26) and the power output intermediate gear (19), the power output driving gear (20), the following is the power output shaft (27) and the power output Output driven gear (21), wherein power output transition gear (18) is installed on the power output driving shaft (25), power output intermediate gear (19) and power output driving gear (20) are fixedly installed on the power output idler shaft ( 26), the power output driven gear (21) is installed on the power output shaft (27). 2. The longitudinal transmission device of a small wheeled tractor according to claim 1, characterized in that: the large bevel gear (14) is fixedly installed on the final drive driving gear shaft (15), and is connected with the small bevel gear shaft (13) The final drive driven gear (17) and the differential (16) are connected into one body by bolts, and are meshed with the final drive drive gear shaft (15). 3. The longitudinal transmission device of a small wheeled tractor according to claim 1, characterized in that: the power output transition gear (18) can slide to the right under the action of external force and meshes with the power output intermediate gear (19); The driving gear (20) is in constant mesh with the power output driven gear (21). 4. The longitudinal transmission device of a small wheeled tractor according to claim 2, characterized in that: the large bevel gear (14) is a spiral bevel gear, and the final drive driven gear (17) is a helical gear.

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