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The repair manual of SINOTRUK HOWO HW19710 Transmission 1

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The repair manual of SINOTRUK HOWO HW19710 Transmission 1

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The repair manual of HW19710 Transmission

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Section II HW Series Transmission Features

I. Revelation of HW Series Transmission.

Sino-truck, in order to adapt to the developing trend and matching demand of greater

power of heavy truck, independently develop HW series new transmission assembly for

different working and road conditions technological innovation, depending on the strong

research and developing strength and several years’ technological accumulation, as well

as collecting the great achievements of transmission of the world. At present, there are six

series: HW19712、 HW20716 、HW19710 、HW13710 、 AMT, have been

developed, as shown in Figure 1-1.

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Figure 1-1: Shape of HW Series Transmission

II. Main Structure Features and Advantages of HW Series Transmission.

1. Main gear-box adopts a twin countershaft structure, and supplementary

gear-box adopts planetary gear drive structure. This greatly upgrades the

reliability of assembly.

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Figure 1-2: Drive Structure of HW Series Transmission

Main gearbox is twin countershaft structure, which can distribute the power. Each

countershaft, two end bearings and gears of countershaft only bears 1/2 general

power, and the input shaft and gears of the spindle bears 1/2 general powers too. So,

the spindle bears the same power which is in opposite direction, and only bears the

torque, not bending moment. This design eliminates destroy to the engaged area

caused by the spindle deforming, reduces the noise of gear engagement of

transmission and increases the longevity of the gears. By these means, the

transmission can prolong its use life and make it more stability and reliability.

The twin countershaft, by reducing the center distance, diameter of each shift gear,

width of gear and diameter of each axle, can shorten the dimension of transmission

axles, lighten the weight. Short dimension is convent for arrangement of whole

vehicle, and light transmission weigh can reduce the oil consumption, then the

economic benefits can be increased.

Supplementary gearbox is planet gear drive structure, which effective overcomes

the problem of pre-malfunction of supplementary gearbox (especially used in the

worse conditions, such as mine industry and others, its effect is more distinctness),

and greatly prolongs the use life of transmission assembly based on the sufficient

analysis of malfunction model of supplementary gearbox by using twin countershaft

and overcome this defect.

2. Main gearbox adopts two-stage floats, and supplementary gearbox adopts

center wheel float. This can ensure each gear even load.

Both end of the spindle have float amount and gear float of spindle; this can ensure

the load to be distributed evenly. Sun wheel and gear float of supplementary

gearbox ensures the planet structure to be loaded evenly. The structure, connected

the twin countershaft of main gearbox with the supplementary gearbox, needs

special positioning device of spindle as the following figure shown.

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1. spindle，2. bush，3. ball joint，4. output shaft，5. bearing，6. input shaft

Figure 1-3: Float of Spindle and Planet Structure

3. Input shaft adopts Span Support Structure to increase the support rigidity,

and the reliability of supplementary gearbox.

Rigidity support of big span bearing of output shaft ensures the support rigidity of

output shaft, and it increases the life of gear and synchronizer of supplementary

gearbox, and effectively resolves the disadvantage of short life of other products.

4. The Gear Shifting between main gearbox and supplementary one, has mutual

interlocking gear, this effectively protect the synchronizer of supplementary

gearbox.

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Figure 1-4: Interlocking Gear of main and supplementary gearboxes

The synchronizing ring of synchronizer of supplementary gearbox, which is made by

Molybdenum sprayed on steel base, has features of larger friction force and longer

use life. Additional main and supplementary gearboxes can ensure that before the

supplementary gearbox shifting gear, the main gearbox can do this. This can greatly

prolong the use life of synchronizer of supplementary gearbox.

When range gear fork axle of supplementary gearbox does not get position, the

interlocking plate is exactly inside of the groove of fork axle of main gearbox by the

spring operation, and then the fork axle of main gearbox is locked in the neutral

position. When range gear fork axle of supplementary gearbox gets position, it can

push the interlocking turning to unlock the control of fork axle of main gearbox, and

then the driver can put into gear on demanding.

5. The Housing of Transmission Adopts Vertically-split Structure which is

Convenient to assemble and maintain.

The main housing adopts vertically-split structure. The dimension of the middle part

of the housing can be adjusted in accordance with the volume and shift gears of the

transmission, and another two parts can be in common use. In addition, the

vertically-split structure makes the gear alignment easily and rapidly.

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Figure 1-5: The Housing Structure of HW Series Transmission

6. Design of Small Functional Integrated Cover makes the Assembly Structure

Compaction.

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Figure 1-6: Structure of Small housing Assembly of HW Transmission

Shift gear swing-arm, shift gear head, interlocking fork, sensor drive ring, sector lock

block, high and low shift gear locating ring, all are equipped in the gear axle. The

gear shift choice can be realized by gear axle horizontal movement through

swing-arm operation, and putting into gear and out of gear can be realized by gear

axle front and back movement. Shift gear interlocking function, which can avoid the

random gear, can be realized by interlocking fork. Shift gear locking, which can

avoid gear escaping, can be realized by lock device. All functions of the locking,

interlocking and shift gear choice are centralized in the small housing, it can make

the function more reliability and maintenance more convenience.

7. Initiative Lubricating Adoption.

The key parts of HW series transmission adopt initiative lubricating. Adding

lubrication oil pump and relative oil pipe in the transmission assembly can greatly

prolong the use life of transmission.

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Figure 1-7: Lubricating System of HW Series Transmission

8. Power Take-off (PTO) Output with Direction invariable and Convenient PTO for

Braking and Travelling.

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Figure 1-8: PTO Installment of HW Series Transmission

PTO is driven by right auxiliary axle of main gearbox; its direction and speed are not

affected under this condition. This can be convenient to realize power take-off in

neutral position, and ensure normal direction turning under the reverse shift gear

conditions.

9. Greatly Increasing the Reliability of Dual H Valve by its Cut-off Structure

Design

Dual H valve assembly in the HW transmission adopts end seal, and greatly

increases its reliability.

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Figure 1-9: Dual H Valve Assembly of HW Series Transmission

10. Range Shift Gear Fork Adopts Swing-fork Design, and Fork Axle Adopts Span

Support Structure, all these increase the use life of shift gear structure.

This kind of design can effectively reduce the bending moment of range shift gear

fork and fork axle, improve the interaction of the shift gear axle and hole of housing,

and increase the relevant use life and reliability.

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Figure 1-10: Shift Structure of HW Series Transmission

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