CN201475263U - A New Type of Heavy Duty Truck Gearbox - Google Patents

Abstract

The utility model discloses a novel gearbox for heavy-duty trucks, which comprises an input shaft, a main shaft, a main shaft positioning spline sleeve, a main shaft sliding sleeve and a retaining spring, wherein the front end of the main shaft extends into the rear end hole of the input shaft to realize axial positioning; The main shaft positioning spline sleeve is located between the main shaft and the input shaft as a transitional part between the main shaft and the input shaft; the inner hole of the main shaft positioning spline sleeve is a light hole, and there is a certain gap between the spindle journal and the inner hole of the main shaft positioning spline sleeve. To realize the floating of the main shaft; the sliding sleeve of the main shaft is set on the main shaft, and a circlip is installed between the main shaft positioning spline sleeve and the input shaft to realize the axial positioning of the main shaft positioning spline sleeve to the right; the external spline of the main shaft positioning spline sleeve and the input shaft The top value and backlash value of the internal spline are different to realize the axial positioning of the spindle positioning spline sleeve to the left. The utility model realizes the two-way axial positioning of the main shaft, can bear the axial force of gear shifting, and solves the axial positioning problem of the main shaft after the combination of double auxiliary shafts and planetary gear train double support structures in the heavy-duty gearbox.

Description

A New Type of Heavy Duty Truck Gearbox

technical field

The utility model provides a novel gearbox for heavy trucks.

Background technique

In the transmission structure of heavy-duty trucks, the combination of main box double countershaft + auxiliary box planetary gear train is a perfect solution. The main box double counter shaft has a simple structure and strong bearing capacity; the auxiliary box planetary gear train has a compact structure and large transmission torque . The front and rear double supports of the planetary gear system effectively ensure the support rigidity of the output shaft, eliminate the influence of vehicle factors (such as unbalanced drive shaft) on the normal operation of the gearbox, and significantly improve the service life of the auxiliary box.

However, the planetary gear train of the auxiliary box adopts a front and rear double support structure, and its front support is located on the rear wall of the middle casing, which occupies the support position of the rear end of the main shaft in the traditional double countershaft gearbox. Therefore, the axial positioning of the main shaft becomes a key and urgently need to be solved.

Contents of the invention

Aiming at the above-mentioned prior art, the utility model provides a new type of heavy-duty truck gearbox, which solves the axial positioning problem of the main shaft after the combination of double auxiliary shafts and planetary gear train double support structure in the heavy-duty gearbox.

The utility model is achieved through the following technical solutions:

A new type of heavy-duty truck gearbox, including an input shaft, a main shaft, a main shaft positioning spline sleeve, a main shaft sliding sleeve, and a circlip, wherein the front end of the main shaft extends into the rear end hole of the input shaft to achieve axial positioning; the main shaft positioning spline sleeve Located between the main shaft and the input shaft, as a transition part between the main shaft and the input shaft; the inner hole of the main shaft positioning spline sleeve is a light hole, and there is a certain gap between the main shaft journal and the inner hole of the main shaft positioning spline sleeve to realize the floating of the main shaft; The main shaft sliding sleeve is set on the main shaft, and a circlip is installed between the main shaft positioning spline sleeve and the input shaft (in order to facilitate the assembly of the circlip, two teeth are removed from the main shaft sliding sleeve to leave the assembly gap), so as to realize the spindle positioning spline sleeve Rightward axial positioning; the top value and backlash value of the external spline of the main shaft positioning spline sleeve and the input shaft internal spline are different, so as to realize the leftward axial positioning of the main shaft positioning spline sleeve.

The main shaft is connected with the input shaft through a round nut. When installing round nuts, stop washers can be used to prevent the round nuts from loosening during use.

Wear-resistant gaskets are installed at both ends of the inner hole of the main shaft positioning spline sleeve, and there is a certain amount of clearance between the wear-resistant gasket and the end face of the main shaft positioning spline sleeve to prevent excessive wear of the main shaft. In the case of large axial force, the wear-resistant gasket can be replaced by a thrust bearing.

In the new type of heavy-duty truck gearbox, cylindrical roller bearings or Z-shaped wear-resistant sleeves can be used to replace the main shaft positioning spline sleeve; retaining rings can be used to replace the spline shoulder.

When in use, the shifting force on the main shaft is transmitted to the main shaft positioning spline sleeve, and then transmitted to the input shaft through the main shaft positioning spline sleeve, and finally balanced by the housing; and the main shaft floating function of the double countershaft gearbox can be realized .

The utility model can realize the two-way axial positioning of the main shaft, can bear the axial force of shifting, and can realize the main shaft floating function in the traditional double countershaft gearbox, and better solves the problem of using double countershafts + planets in the heavy-duty gearbox. The axial positioning of the main shaft after the double support structure of the wheel train is combined.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is an A-A view of the main shaft sliding sleeve in Fig. 1 .

Among them, 1. Input shaft; 2. Main shaft positioning spline sleeve; 3. Input shaft gear; 4. Main shaft sliding sleeve; 5. Main shaft gear; 6. Main shaft; 7. Main shaft positioning circlip; 8. Input shaft gear circlip ; 9, wear-resistant gasket; 10, stop washer; 11, round nut; 12, intermediate shaft.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

A new type of heavy-duty truck gearbox, including an input shaft 1, a main shaft 6, a main shaft positioning spline sleeve 2, a main shaft sliding sleeve 4, and a circlip 7, as shown in Figure 1, wherein the front end of the main shaft 6 extends into the rear end of the input shaft 1 In the hole, the axial positioning is realized; the main shaft positioning spline sleeve 2 is located between the main shaft 6 and the input shaft 1, as a transition part between the main shaft 6 and the input shaft 1; the inner hole of the main shaft positioning spline sleeve 2 is a light hole, and the main shaft 6 journal There is a certain gap between the inner hole of the main shaft positioning spline sleeve 2 to realize the floating of the main shaft 6; (Two teeth are removed from the main shaft sliding sleeve 4 to free up the assembly gap, as shown in Figure 2, so as to facilitate the assembly of the main shaft positioning circlip 7), so as to realize the axial positioning of the main shaft positioning spline sleeve 2 to the right; the main shaft The top value and backlash value of the external spline of the positioning spline sleeve 2 and the internal spline of the input shaft 1 are different, so as to realize the leftward axial positioning of the main shaft positioning spline sleeve 2; the input shaft gear 3 passes through the input shaft gear circlip 8 Positioned on input shaft 1.

The main shaft 6 is connected to the input shaft 1 through a round nut 11 . When the round nut 11 is installed, the stop washer 10 can be used to prevent the round nut 11 from returning loose during use.

Wear-resistant pads 9 are installed at both ends of the inner hole of the main shaft positioning spline sleeve 2, and there is a certain amount of clearance between the wear-resistant pad 9 and the end face of the main shaft positioning spline sleeve 2 to prevent excessive wear of the main shaft 6.

When in use, the shifting force on the main shaft 6 is transmitted to the main shaft positioning spline sleeve 2, and then transmitted to the input shaft 1 through the main shaft positioning spline sleeve 2, and finally balanced by the housing; and double countershaft gearbox can be realized The spindle floating function.

After the power is input through the input shaft 1, it is shunted to the intermediate shaft 12 through the input shaft gear 3, and then the intermediate shaft gear transmits the power to the main shaft 6 through the main shaft gear 5 through the main shaft sliding sleeve 4 to realize power output.

Claims (4)

1. a novel heavy duty truck gearbox comprises input shaft, main shaft, it is characterized in that: also comprise main shaft location spline housing, main shaft sliding sleeve, jump ring, wherein, described front-end of spindle stretches into behind the input shaft in the stomidium, realizes axially locating; Main shaft location spline housing is between main shaft and input shaft, as the transition part between main shaft and input shaft; Main shaft location spline housing endoporus is a unthreaded hole, and is gapped between main shaft axle journal and the main shaft location spline housing endoporus, realizes that main shaft floats; The main shaft sliding sleeve is enclosed within on the main shaft, between main shaft location spline housing and the input shaft jump ring is installed, and realizes main shaft location spline housing axially locating to the right; The top value of main shaft location spline housing external splines and input shaft internal spline is different with backlash values, realizes main shaft location spline housing axially locating left.

2. a kind of novel heavy duty truck gearbox according to claim 1, it is characterized in that: described main shaft is connected with input shaft by round nut.

3. a kind of novel heavy duty truck gearbox according to claim 1 is characterized in that: described main shaft location spline housing endoporus two ends dress wear-resistant gasket or thrust-bearing, wear-resistant gasket or thrust-bearing and main shaft location spline housing end face are gapped.

4. according to each described a kind of novel heavy duty truck gearbox of claim 1～3, it is characterized in that: replace main shaft location spline housing with roller bearing or Z-shaped wear-resistant sleeve.

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