Planetary gearbox and traction-type construction machine

Abstract

A planetary gearbox and a traction-type construction machine. The planetary gearbox comprises an input shaft (IN) and an output shaft (OUT). A first planetary gear train (P1), a second planetary gear train (P2), and a third planetary gear train (P3) are sequentially provided side by side on the input shaft. A fourth planetary gear train (P4), a fifth planetary gear train (P5), and a first clutch (C1) are sequentially provided side by side on the output shaft. A reverse gear brake (BR) is provided on the first planetary gear train; a first forward gear brake (BF1) is provided on the second planetary gear train; a second forward gear brake (BF2) is provided on the third planetary gear train; a third gear brake (B3) is provided on the fourth planetary gear train; and a second gear brake (B2) is provided on the fifth planetary gear train. The first forward gear brake, the second forward gear brake and the reverse gear brake are direction control clutches; and the first clutch, the second gear brake and the third gear brake are gear control clutches. Therefore, six forward gears and three reverse gears can be realized, wherein the transmission ratio of the first forward gear is greater than 4, thereby achieving multiple gears, large transmission ratio range, and small and uniform gear step ratio.

Description

Planetary gearbox and traction type engineering machinery TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and relates to a planetary gearbox and a traction type engineering machinery. BACKGROUND

[0002] The planetary gearbox currently applied to the traction type engineering machinery (such as a bulldozer) mainly adopts front three and rear three or front four and rear four gears, and has problems of few gears, small transmission ratio range, large step ratio between transmission ratios, and three-element control of gears.

[0003] With development, the requirement for high efficiency and energy saving of power shift gearboxes is continuously improved, the number of gears and the transmission ratio range of the existing gearbox cannot make the engine operate more in the economic operating condition, which is not conducive to the improvement of the economy of the whole machine, and because the transmission ratio range is small, the load of the parts of the transmission is large, and the reliability is difficult to guarantee.

[0004] Therefore, a gearbox with many gears, a large transmission ratio range and simple gear control logic is urgently needed to help improve the economy of the whole machine.

[0005] SUMMARY

[0006] Objective: In view of at least one of the above technical problems, the present application provides a planetary gearbox and a traction type engineering machinery.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present application is:

[0008] In a first aspect, a planetary gearbox is provided, comprising an input shaft and an output shaft, the input shaft being provided with a first planetary row, a second planetary row and a third planetary row in sequence and side by side, the output shaft being provided with a fourth planetary row, a fifth planetary row and a first clutch in sequence and side by side, the first planetary row being provided with a reverse gear brake, the second planetary row being provided with a first forward gear brake, the third planetary row being provided with a second forward gear brake, the fourth planetary row being provided with a third gear brake, and the fifth planetary row being provided with a second gear brake.

[0009] The first forward gear brake, the second forward gear brake and the reverse gear brake are direction control clutches, and the first clutch, the second gear brake and the third gear brake are gear control clutches.

[0010] The first forward gear brake is engaged with the first clutch at the same time to realize the first forward gear; the second forward gear brake is engaged with the first clutch at the same time to realize the second forward gear; the first forward gear brake is engaged with the second gear brake at the same time to realize the third forward gear; the second forward gear brake is engaged with the second gear brake at the same time to realize the fourth forward gear; the first forward gear brake is engaged with the third gear brake at the same time to realize the fifth forward gear; the second forward gear brake is engaged with the third gear brake at the same time to realize the sixth forward gear; the reverse gear brake is engaged with the first clutch at the same time to realize the first reverse gear; the reverse gear brake is engaged with the second gear brake at the same time to realize the second reverse gear; the reverse gear brake is engaged with the third gear brake at the same time to realize the third reverse gear; and the transmission ratio of the first forward gear is greater than 4.

[0011] In some embodiments, the first planetary row includes a first sun gear, a first planet carrier, first planet gears and a first ring gear, the first planet gears are movably mounted on the first planet carrier, the first ring gear is engaged with the first planet gears, the first planet gears are engaged with the first sun gear, the first planet carrier is braked by the reverse gear brake;

[0012] The second planetary row includes a second sun gear, a second planet carrier, second planet gears and a second ring gear, the second planet gears are movably mounted on the second planet carrier, the second ring gear is engaged with the second planet gears, the second planet gears are engaged with the second sun gear, the second ring gear is braked by the forward gear brake;

[0013] The third planetary row includes a third sun gear, a third planet carrier, third planet gears and a third ring gear, the third planet gears are movably mounted on the third planet carrier, the third ring gear is engaged with the third planet gears, the third planet gears are engaged with the third sun gear, the third ring gear is braked by the second forward gear brake;

[0014] The first sun gear, the second sun gear and the third sun gear are connected with the input shaft; the first ring gear is fixedly connected with the second planet carrier and the third planet carrier.

[0015] In some embodiments, the fourth planetary row includes a fourth sun gear, a fourth planet carrier, fourth planet gears and a fourth ring gear, the fourth planet gears are movably mounted on the fourth planet carrier, the fourth ring gear is engaged with the fourth planet gears, the fourth planet gears are engaged with the fourth sun gear, the fourth ring gear is braked by the third gear brake;

[0016] The fifth planetary gear set comprises a fifth sun gear, a fifth planet carrier, fifth planet gears and a fifth ring gear, the fifth planet gears are movably installed on the fifth planet carrier, the fifth ring gear is engaged with the fifth planet gears, the fifth planet gears are engaged with the fifth sun gear, and the fifth ring gear is braked by the second gear brake;

[0017] The inner hub of the first clutch is fixedly connected with the output shaft, and the outer hub of the first clutch is fixedly connected with the fifth ring gear.

[0018] The fourth sun gear and the fifth sun gear are fixedly connected with the output shaft, the third planet carrier is fixedly connected with the fourth planet carrier, and the fourth ring gear is fixedly connected with the fifth planet carrier.

[0019] In some embodiments, the first forward gear brake and the first clutch are simultaneously engaged, the second ring gear is fixed, the fifth ring gear and the output shaft are connected as a whole, the second sun gear is connected with the input shaft by means of the spline connection, and rotates in the same direction and at the same speed; in the second planetary gear set, the second sun gear inputs power, the second planet carrier and the fourth planet carrier rotate in the same direction as the input shaft due to the fixed second ring gear; in the fourth planetary gear set, the fourth planet carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft to drive the output shaft to rotate, and the fourth ring gear drives the fifth planet carrier to rotate; in the fifth planetary gear set, the fifth planet carrier inputs power, the fifth ring gear and the output shaft are connected as a whole due to the engagement of the first clutch, and the fifth sun gear and the fifth ring gear jointly output power; finally, the power is output to the output shaft through the fourth sun gear, the fifth sun gear and the fifth ring gear, and forward gear one is realized.

[0020] In some embodiments, the second forward gear brake and the first clutch are simultaneously engaged, the third ring gear is fixed, the fifth ring gear and the output shaft are connected as a whole, the third sun gear is connected with the input shaft by means of the spline connection, and rotates in the same direction and at the same speed; in the third planetary gear set, the third sun gear inputs power, the third planet carrier and the fourth planet carrier rotate in the same direction as the input shaft due to the fixed third ring gear; in the fourth planetary gear set, the fourth planet carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft to drive the output shaft to rotate, and the fourth ring gear drives the fifth planet carrier to rotate; in the fifth planetary gear set, the fifth planet carrier inputs power, the fifth ring gear and the output shaft are connected as a whole due to the engagement of the first clutch, and the fifth sun gear and the fifth ring gear jointly output power; finally, the power is output to the output shaft through the fourth sun gear, the fifth sun gear and the fifth ring gear, and forward gear two is realized.

[0021] In some embodiments, the first forward gear brake and the second gear brake are engaged at the same time, respectively fixing the second ring gear and the fifth ring gear, the second sun gear and the input shaft are connected by spline, rotating in the same direction and at the same speed; in the second planetary gear set, the second sun gear inputs power, since the second ring gear is fixed by the first forward gear brake, the second carrier and the fourth carrier rotate in the same direction as the input shaft; in the fourth planetary gear set, the fourth carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft, driving the output shaft to rotate, the fourth ring gear drives the fifth carrier to rotate; in the fifth planetary gear set, the fifth ring gear is fixed, the fifth sun gear outputs power; finally, the fourth sun gear and the fifth sun gear jointly output power to the output shaft, realizing forward three gears.

[0022] In some embodiments, the second forward gear brake and the third gear brake are engaged at the same time, respectively fixing the third ring gear and the fifth ring gear, the third sun gear and the input shaft are connected by spline, rotating in the same direction and at the same speed; in the third planetary gear set, the third sun gear inputs power, since the third ring gear is fixed, the third carrier and the fourth carrier rotate in the same direction as the input shaft; in the fourth planetary gear set, the fourth carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft, driving the output shaft to rotate, the fourth ring gear drives the fifth carrier to rotate; in the fifth planetary gear set, the fifth ring gear is fixed, the fifth sun gear outputs power; finally, the fourth sun gear and the fifth sun gear jointly output power to the output shaft, realizing forward four gears.

[0023] In some embodiments, the first forward gear brake and the third gear brake are engaged at the same time, respectively fixing the second ring gear and the fourth ring gear, the second sun gear and the input shaft are connected by spline, rotating in the same direction and at the same speed; in the second planetary gear set, the second sun gear inputs power, since the second ring gear is fixed, the second carrier, the fourth carrier rotate in the same direction as the input shaft; in the fourth planetary gear set, the fourth carrier inputs power, the fourth ring gear is fixed, the fourth sun gear outputs power to the output shaft, realizing forward five gears.

[0024] In some embodiments, the second forward gear brake and the third gear brake are engaged at the same time, respectively fixing the third ring gear and the fourth ring gear, the third sun gear and the input shaft are connected by spline, rotating in the same direction and at the same speed; in the third planetary gear set, the third sun gear inputs power, since the third ring gear is fixed, the third carrier and the fourth carrier rotate in the same direction as the input shaft; in the fourth planetary gear set, the fourth carrier inputs power, the fourth ring gear is fixed, the fourth sun gear outputs power to the output shaft, realizing forward six gears.

[0025] In some embodiments, the reverse gear brake and the first clutch are engaged at the same time, respectively fixing the first carrier and connecting the fifth ring gear and the output shaft as a whole, the first sun gear is connected with the input shaft through the spline, rotating in the same direction and at the same speed; in the first planetary gear set, the first sun gear inputs power, the first ring gear rotates reversely with the first sun gear and outputs power, and drives the fourth carrier to rotate at the same time, since the first carrier is fixed; in the fourth planetary gear set, the fourth carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth carrier to rotate; in the fifth planetary gear set, the fifth carrier inputs power, since the first clutch is engaged, the fifth ring gear and the output shaft are connected as a whole, and the fifth sun gear and the fifth ring gear output power together; finally, the power is output to the output shaft through the fourth sun gear, the fifth sun gear and the fifth ring gear, realizing the reverse first gear.

[0026] In some embodiments, the reverse gear brake and the second gear brake are engaged at the same time, respectively fixing the first carrier and the fifth ring gear, the first sun gear is connected with the input shaft through the spline, rotating in the same direction and at the same speed; in the first planetary gear set, the first sun gear inputs power, since the first carrier is fixed by the reverse gear brake, the first ring gear rotates reversely with the first sun gear and outputs power, and drives the fourth carrier to rotate at the same time; in the fourth planetary gear set, the fourth carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected with the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth carrier to rotate; in the fifth planetary gear set, the fifth ring gear is fixed, and the fifth sun gear outputs power; finally, the fourth sun gear and the fifth sun gear output power to the output shaft together, realizing the reverse second gear.

[0027] In some embodiments, the reverse gear brake and the third gear brake are engaged at the same time, respectively fixing the first carrier and the fourth ring gear, the first sun gear is connected with the input shaft through the spline, rotating in the same direction and at the same speed; in the first planetary gear set, the first sun gear inputs power, since the first carrier is fixed, the first ring gear rotates reversely with the first sun gear and outputs power, and drives the fourth carrier to rotate at the same time; in the fourth planetary gear set, the fourth carrier inputs power, the fourth ring gear is fixed, and the fourth sun gear outputs power to the output shaft, realizing the reverse third gear.

[0028] In some embodiments, the input shaft, the first sun gear, the second sun gear, the third sun gear, the fourth sun gear, the fifth sun gear and the output shaft are coaxially arranged.

[0029] In some embodiments, the ratio of the first ring gear teeth number to the first sun gear teeth number is 2.529; the ratio of the second ring gear teeth number to the second sun gear teeth number is 3.276; the ratio of the third ring gear teeth number to the third sun gear teeth number is 2.143; the ratio of the fourth ring gear teeth number to the fourth sun gear teeth number is 2.143; the ratio of the fifth ring gear teeth number to the fifth sun gear teeth number is 1.824.

[0030] Further, in some embodiments, the transmission ratio range of the first forward gear is 4.28, the transmission ratio range of the second forward gear is 3.14, the transmission ratio range of the third forward gear is 2.39, the transmission ratio range of the fourth forward gear is 1.76; the transmission ratio range of the fifth forward gear is 1.36, the transmission ratio range of the sixth forward gear is 1.00; the transmission ratio range of the first reverse gear is 2.53, the transmission ratio range of the second reverse gear is 1.42, the transmission ratio range of the third reverse gear is 0.8.

[0031] Further, in some embodiments, the step ratio of the first forward gear to the second forward gear is 1.36, the step ratio of the second forward gear to the third forward gear is 1.31, the step ratio of the third forward gear to the fourth forward gear is 1.36; the step ratio of the fourth forward gear to the fifth forward gear is 1.29; the step ratio of the fifth forward gear to the sixth forward gear is 1.36; the step ratio of the first reverse gear to the second reverse gear is 1.79, the step ratio of the second reverse gear to the third reverse gear is 1.76.

[0032] In some embodiments, the reverse gear brake, the first forward gear brake, the second forward gear brake, the third gear brake, the second gear brake and the first clutch are all multi-plate friction control structures.

[0033] In the second aspect, a traction type engineering machine is provided, comprising the planetary gearbox.

[0034] In some embodiments, the traction type engineering machine is a bulldozer.

[0035] Advantages: The planetary gearbox and the traction type engineering machine provided by the present application have the following advantages: five planetary gears, five brakes and one clutch are included, the planetary gears are all single-planet simple planetary gears, the highest six forward gears and three reverse gears can be realized, the transmission ratio of the first forward gear is greater than 4, the gears are more, the transmission ratio range is large, the step ratio is small and uniform, the engine can run more in the economic working area, and the economy of the whole machine is improved. The reverse gear brake, the first forward gear brake, the second forward gear brake, the third gear brake, the second gear brake and the first clutch are all multi-plate friction control structures, the piston is pushed by hydraulic oil to couple or brake, and the gears are controlled by two elements, so that the friction sliding work and heat loss of the friction plate are reduced, and the reliability of the friction plate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is a schematic representation of a planetary gearbox according to an embodiment of the application;

[0037] Fig. IN - input shaft; OUT - output shaft; P1 - first planetary row; P2 - second planetary row; P3 - third planetary row; P4 - fourth planetary row; P5 - fifth planetary row; BR - reverse brake; BF1 - first forward brake; BF2 - second forward brake; B3 - third brake; B2 - second brake; C1 - first clutch; S1 - first sun gear; S2 - second sun gear; S3 - third sun gear; S4 - fourth sun gear; S5 - fifth sun gear; PC1 - first planet carrier; PC2 - second planet carrier; PC3 - third planet carrier; PC4 - fourth planet carrier; PC5 - fifth planet carrier; R1 - first ring gear; R2 - second ring gear; R3 - third ring gear; R4 - fourth ring gear; R5 - fifth ring gear. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and not intended to limit the present application and its applications or uses in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0039] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in the embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. Meanwhile, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The techniques, methods, and devices known to those of ordinary skill in the related art can not be discussed in detail, but should be considered as part of the authorized description where appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as limiting. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0042] Embodiment 1: A planetary gearbox, comprising an input shaft IN and an output shaft OUT, the input shaft IN is provided with a first planetary row P1, a second planetary row P2 and a third planetary row P3 in sequence and side by side; the output shaft OUT is provided with a fourth planetary row P4, a fifth planetary row P5 and a first clutch C1 in sequence and side by side; the first planetary row P1 is provided with a reverse brake BR, the second planetary row P2 is provided with a first forward brake BF1, the third planetary row P3 is provided with a second forward brake BF2, the fourth planetary row P4 is provided with a third brake B3, and the fifth planetary row P5 is provided with a second brake B2;

[0043] The first forward brake BF1, the second forward brake BF2 and the reverse brake BR are direction control clutches, and the first clutch C1, the second brake B2 and the third brake B3 are gear control clutches;

[0044] Simultaneous control of any one of the direction control clutches and any one of the gear control clutches can realize different gears of the planetary gearbox.

[0045] The first forward brake BF1 and the first clutch C1 are engaged at the same time to realize the first forward gear;

[0046] The second forward gear brake BF2 is engaged simultaneously with the first clutch CI to realize the second forward gear;

[0047] The first forward gear brake BF1 is engaged simultaneously with the second gear brake B2 to realize the third forward gear;

[0048] The second forward gear brake BF2 is engaged simultaneously with the second gear brake B2 to realize the fourth forward gear;

[0049] The first forward gear brake BF1 is engaged simultaneously with the third gear brake B3 to realize the fifth forward gear;

[0050] The second forward gear brake BF2 is engaged simultaneously with the third gear brake B3 to realize the sixth forward gear;

[0051] The reverse gear brake BR is engaged simultaneously with the first clutch CI to realize the first reverse gear;

[0052] The reverse gear brake BR is engaged simultaneously with the second gear brake B2 to realize the second reverse gear;

[0053] The reverse gear brake BR is engaged simultaneously with the third gear brake B3 to realize the third reverse gear;

[0054] And the first forward gear transmission ratio is greater than 4.

[0055] In some embodiments, a planetary gearbox for traction type engineering machinery, as shown in FIG. 1, includes a first planetary set P1, a second planetary set P2, a third planetary set P3, a fourth planetary set P4 and a fifth planetary set P5 arranged in sequence and side by side;

[0056] The first planetary set P1 includes a first sun gear S1, a first planet carrier PC1, a first planet gear CA1 and a first ring gear R1, the first planet gear CA1 is movably mounted on the first planet carrier PC1, the first ring gear R1 is engaged with the first planet gear CA1, the first planet gear CA1 is engaged with the first sun gear S1, and the first planet carrier PC1 is braked by the reverse gear brake BR;

[0057] The second planetary set P2 includes a second sun gear S2, a second planet carrier PC2, a second planet gear CA2 and a second ring gear R2, the second planet gear CA2 is movably mounted on the second planet carrier PC2, the second ring gear R2 is engaged with the second planet gear CA2, the second planet gear CA2 is engaged with the second sun gear S2, and the second ring gear R2 is braked by the forward gear brake BF1;

[0058] The third planetary gear set P3 includes a third sun gear S3, a third planet carrier PC3, third planet gears CA3 movably mounted on the third planet carrier PC3, and a third ring gear R3 engaged with the third planet gears CA3, the third planet gears CA3 engaged with the third sun gear S3, the third ring gear R3 being braked by a second forward gear brake BF2;

[0059] The first sun gear S1, the second sun gear S2, and the third sun gear S3 are connected with the input shaft; the first ring gear R1 is fixedly connected with the second planet carrier PC2 and the third planet carrier PC3.

[0060] The fourth planetary gear set P4 includes a fourth sun gear S4, a fourth planet carrier PC4, fourth planet gears CA4 movably mounted on the fourth planet carrier PC4, and a fourth ring gear R4 engaged with the fourth planet gears CA4, the fourth planet gears CA4 engaged with the fourth sun gear S4, the fourth ring gear R4 being braked by a third gear brake B3;

[0061] The fifth planetary gear set P5 includes a fifth sun gear S5, a fifth planet carrier PC5, fifth planet gears CA5 movably mounted on the fifth planet carrier PC5, and a fifth ring gear R5 engaged with the fifth planet gears CA5, the fifth planet gears CA5 engaged with the fifth sun gear S5, the fifth ring gear R5 being braked by a second gear brake B2;

[0062] The fourth sun gear S4 and the fifth sun gear S5 are fixedly connected with the output shaft; the third planet carrier PC3 is fixedly connected with the fourth planet carrier PC4, the fourth ring gear R4 is fixedly connected with the fifth planet carrier PC5; the fifth ring gear R5 is connected to the output shaft through the first clutch C1.

[0063] In some embodiments, the inner hub of the first clutch C1 is fixedly connected with the output shaft, and the outer hub of the first clutch C1 is fixedly connected with the fifth ring gear R5.

[0064] In some embodiments, the input shaft IN, the first sun gear S1, the second sun gear S2, the third sun gear S3, the fourth sun gear S4, the fifth sun gear S5, and the output shaft OUT are coaxially arranged.

[0065] In some embodiments, the reverse brake BR, the first forward gear brake BF1, the second forward gear brake BF2, the third gear brake B3, the second gear brake B2, and the first clutch C1 are all multi-plate friction actuation structures; a piston is pushed by hydraulic oil to brake.

[0066] Further, in some embodiments, the control logic and gear ratios of each gear are as shown in Table 1.

[0067] Table 1. Control logic and gear ratios of each gear (O indicates that the operating member is engaged)

[0068] The example of the present application is described in detail below in conjunction with Fig. 1 and Table 1, where the gear ratio refers to the ratio of the rotational speed of the input shaft to the rotational speed of the output shaft.

[0069] The first forward gear brake BF1 is engaged at the same time as the first clutch CI, fixing the second ring gear R2 and connecting the fifth ring gear R5 and the output shaft as a whole, and the third sun gear S3 is connected to the input shaft IN through the spline, rotating in the same direction and at the same speed; in the third planetary gear set, the third sun gear S3 inputs power, and the third carrier PC3 and the fourth carrier PC4 rotate in the same direction as the input shaft due to the fixing of the third ring gear R3; in the fourth planetary gear set, the fourth carrier PC4 inputs power, and the fourth sun gear S4 and the fourth ring gear R4 output power, the fourth sun gear S4 being connected to the output shaft OUT to drive the output shaft to rotate, and the fourth ring gear R4 driving the fifth carrier PC5 to rotate; in the fifth planetary gear set, the fifth carrier PC5 inputs power, and the fifth sun gear S5 and the fifth ring gear R5 output power as a whole due to the engagement of the first clutch CI, connecting the fifth ring gear R5 and the output shaft OUT as a whole; finally, the power is output to the output shaft OUT through the fourth sun gear S4, the fifth sun gear S5 and the fifth ring gear R5, realizing forward gear one.

[0070] The second forward gear brake BF2 is engaged at the same time as the first clutch CI, fixing the third ring gear R3 and connecting the fifth ring gear R5 and the output shaft as a whole, and the third sun gear S3 is connected to the input shaft IN through the spline, rotating in the same direction and at the same speed; in the third planetary gear set, the third sun gear S3 inputs power, and the third carrier PC3 and the fourth carrier PC4 rotate in the same direction as the input shaft due to the fixing of the third ring gear R3; in the fourth planetary gear set, the fourth carrier PC4 inputs power, and the fourth sun gear S4 and the fourth ring gear R4 output power, the fourth sun gear S4 being connected to the output shaft OUT to drive the output shaft to rotate, and the fourth ring gear R4 driving the fifth carrier PC5 to rotate; in the fifth planetary gear set, the fifth carrier PC5 inputs power, and the fifth sun gear S5 and the fifth ring gear R5 output power as a whole due to the engagement of the first clutch CI, connecting the fifth ring gear R5 and the output shaft OUT as a whole; finally, the power is output to the output shaft OUT through the fourth sun gear S4, the fifth sun gear S5 and the fifth ring gear R5, realizing forward gear two.

[0071] The first forward gear brake BF1 and the second gear brake B2 are engaged at the same time, and the second ring gear R2 and the fifth ring gear R5 are fixed respectively, the second sun gear S2 and the input shaft IN are connected through the spline, and rotate in the same direction and at the same speed; in the second planetary gear set, the second sun gear S2 inputs power, and the second carrier PC2 and the fourth carrier PC4 rotate in the same direction with the input shaft because the second ring gear R2 is fixed by the first forward gear brake BF1; in the fourth planetary gear set, the fourth carrier PC4 inputs power, and the fourth sun gear S4 outputs power to the output shaft OUT, and the fourth ring gear R4 drives the fifth carrier PC5 to rotate; in the fifth planetary gear set, the fifth ring gear R5 is fixed, and the fifth sun gear S5 outputs power; finally, the fourth sun gear S4 and the fifth sun gear S5 jointly output power to the output shaft OUT, realizing the forward three gears.

[0072] The second forward gear brake BF2 and the second gear brake B2 are engaged at the same time, and the third ring gear R3 and the fifth ring gear R5 are fixed respectively, and the third sun gear S3 and the input shaft IN are connected through the spline and rotate in the same direction and at the same speed; in the third planetary gear set, the third sun gear S3 inputs power, and the third carrier PC3 and the fourth carrier PC4 rotate in the same direction with the input shaft because the third ring gear R3 is fixed; in the fourth planetary gear set, the fourth carrier PC4 inputs power, and the fourth sun gear S4 outputs power to the output shaft OUT, and the fourth ring gear R4 drives the fifth carrier PC5 to rotate; in the fifth planetary gear set, the fifth ring gear R5 is fixed, and the fifth sun gear S5 outputs power; finally, the fourth sun gear S4 and the fifth sun gear S5 jointly output power to the output shaft OUT, realizing the forward four gears.

[0073] The first forward gear brake BF1 and the third gear brake B3 are engaged at the same time, and the second ring gear R2 and the fourth ring gear R4 are fixed respectively, and the second sun gear S2 and the input shaft IN are connected through the spline and rotate in the same direction and at the same speed; in the second planetary gear set, the second sun gear S2 inputs power, and the second carrier PC2 and the fourth carrier PC4 rotate in the same direction with the input shaft because the second ring gear R2 is fixed; in the fourth planetary gear set, the fourth carrier PC4 inputs power, and the fourth ring gear R4 is fixed, and the fourth sun gear S4 outputs power to the output shaft OUT, realizing the forward five gears.

[0074] The second forward brake B F2 is engaged with the third brake B3 at the same time, and the third ring gear R3 and the fourth ring gear R4 are fixed respectively, the third sun gear S3 is connected with the input shaft IN through the spline, and rotates in the same direction and at the same speed; in the third planetary gear set, the third sun gear S3 inputs power, the third ring gear R3 is fixed, and the third planet carrier PC3 and the fourth planet carrier PC4 rotate in the same direction as the input shaft; in the fourth planetary gear set, the fourth planet carrier PC4 inputs power, the fourth ring gear R4 is fixed, the fourth sun gear S4 outputs power to the output shaft OUT, and the sixth forward gear is realized.

[0075] The reverse brake BR is engaged with the first clutch C1 at the same time, and the first planet carrier PC1 is fixed, and the fifth ring gear R5 and the output shaft OUT are connected as a whole, the first sun gear S1 is connected with the input shaft IN through the spline, and rotates in the same direction and at the same speed; in the first planetary gear set, the first sun gear S1 inputs power, the first planet carrier PC1 is fixed, and the first ring gear R1 rotates in the opposite direction of the first sun gear S1 and outputs power, and drives the fourth planet carrier PC4 to rotate; in the fourth planetary gear set, the fourth planet carrier PC4 inputs power, the fourth sun gear S4 and the fourth ring gear R4 output power, the fourth sun gear S4 is connected with the output shaft OUT, drives the output shaft to rotate, and the fourth ring gear R4 drives the fifth planet carrier PC5 to rotate; in the fifth planetary gear set, the fifth planet carrier PC5 inputs power, the first clutch C1 is engaged, the fifth ring gear R5 and the output shaft OUT are connected as a whole, and the fifth sun gear S5 and the fifth ring gear S5 jointly output power; finally, the power is output to the output shaft OUT through the fourth sun gear S4, the fifth sun gear S5 and the fifth ring gear R5, and the first reverse gear is realized.

[0076] The reverse brake BR is engaged with the second brake B2 at the same time, and the first planet carrier PC1 and the fifth ring gear R5 are fixed respectively, the first sun gear S1 is connected with the input shaft IN through the spline, and rotates in the same direction and at the same speed; in the first planetary gear set, the first sun gear S1 inputs power, the first planet carrier PC1 is fixed by the reverse brake BR, the first ring gear R1 rotates in the opposite direction of the first sun gear S1 and outputs power, and drives the fourth planet carrier PC4 to rotate; in the fourth planetary gear set, the fourth planet carrier PC4 inputs power, the fourth sun gear S4 and the fourth ring gear R4 output power, the fourth sun gear S4 is connected with the output shaft OUT, drives the output shaft to rotate, and the fourth ring gear R4 drives the fifth planet carrier PC5 to rotate; in the fifth planetary gear set, the fifth ring gear R5 is fixed, and the fifth sun gear S5 outputs power; finally, the fourth sun gear S4 and the fifth sun gear S5 jointly output power to the output shaft OUT, and the second reverse gear is realized.

[0077] The reverse brake BR is engaged at the same time as the third brake B3, and the first planet carrier PC1 and the fourth ring gear R4 are fixed respectively, the first sun gear S1 rotates with the input shaft IN through the spline connection in the same direction and at the same speed; in the first planetary gear set, the first sun gear S1 inputs power, and since the first planet carrier PC1 is fixed, the first ring gear R1 rotates in the opposite direction of the first sun gear S1 and outputs power, simultaneously driving the fourth planet carrier PC4 to rotate; in the fourth planetary gear set, the fourth planet carrier PC4 inputs power, the fourth ring gear R4 is fixed, and the fourth sun gear S4 outputs power to the output shaft OUT, realizing the reverse three-gear.

[0078] The transmission ratio of each gear is determined by the K value of the five planetary gear sets. The K value of the planetary gear set refers to the ratio of the number of teeth of the ring gear to the number of teeth of the sun gear. For example, when K1 = 2.529, K2 = 3.276, K3 = K4 = 2.143, and K5 = 1.824, the transmission ratios of each gear shown in Table 1 are obtained, realizing a six-gear forward and three-gear reverse transmission mechanism. The first-gear speed ratio is greater than 4, which can reduce the load of the hydraulic torque converter under low-speed heavy-load working conditions of the bulldozer, improve the reliability of the hydraulic torque converter, and enable the engine to operate more in the economic operating zone, thereby improving the economy of the entire machine. As can be seen from the gear shifting logic of each gear in Table 1, each gear is controlled by operating two elements, which can reduce the frictional work and heat loss of the friction plate and improve the reliability of the friction plate.

[0079] In some embodiments, the ratio of the number of teeth of the first ring gear R1 to the number of teeth of the first sun gear S1 is 2.529.

[0080] In some embodiments, the ratio of the number of teeth of the second ring gear R2 to the number of teeth of the second sun gear S2 is 3.276.

[0081] In some embodiments, the ratio of the number of teeth of the third ring gear R3 to the number of teeth of the third sun gear S3 is 2.143.

[0082] In some embodiments, the ratio of the number of teeth of the fourth ring gear R4 to the number of teeth of the fourth sun gear S4 is 2.143.

[0083] In some embodiments, the ratio of the number of teeth of the fifth ring gear R5 to the number of teeth of the fifth sun gear S5 is 1.824.

[0084] Further, the transmission ratio of the first-gear forward is 4.28, the transmission ratio of the second-gear forward is in the range of 3.14, the transmission ratio of the third-gear forward is 2.39, the transmission ratio of the fourth-gear forward is 1.76; the transmission ratio of the fifth-gear forward is 1.36, and the transmission ratio of the sixth-gear forward is 1.00; the transmission ratio of the first-gear reverse is 2.53, the transmission ratio of the second-gear reverse is 1.42, and the transmission ratio of the third-gear reverse is 0.8.

[0085] Further, the step ratio of the first forward gear to the second forward gear is 1.36, the step ratio of the second forward gear to the third forward gear is 1.31, the step ratio of the third forward gear to the fourth forward gear is 1.36; the step ratio of the fourth forward gear to the fifth forward gear is 1.29; the step ratio of the fifth forward gear to the sixth forward gear is 1.36; the step ratio of the first reverse gear to the second reverse gear is 1.79, and the step ratio of the second reverse gear to the third reverse gear is 1.76.

[0086] The embodiment discloses a planetary gearbox for a traction type engineering machine, as shown in Fig. 1, which comprises an input shaft IN, an output shaft OUT, five planetary rows (P1-P5), five brakes (BR, BF, B2-B4) and a clutch (C1).

[0087] Each planetary row comprises a sun gear (S1-S5), a planet carrier (PC1-PC5), a planet gear (CA1-CA5) and a ring gear (R1-R5); the ring gears are coaxially distributed with the sun gears, the planet gears are respectively installed on the planet carriers through planet shafts and bearings, and each planet gear is internally engaged with the ring gear of the same planetary row and externally engaged with the sun gear of the same planetary row.

[0088] The five planetary rows are distributed in parallel from left to right, and the five sun gears, the input shaft IN and the output shaft OUT are coaxially arranged.

[0089] The planetary gearbox for the traction type engineering machine in the application comprises five planetary rows, five brakes and a clutch, the planetary rows are all single-planet simple planetary rows, the highest six forward gears and three reverse gears can be realized, the first forward gear has a transmission ratio greater than 4, the gear positions are many, the transmission ratio range is large, the step ratio is small and uniform, the engine can run more in the economic working area, and the economy of the whole machine is improved. The five brakes and the clutch are all multi-plate friction control structures, the piston is pushed by hydraulic oil to be coupled or braked, and the gear positions are controlled through two elements, the frictional work and heat loss of the friction plates can be reduced, and the reliability of the friction plates is improved.

[0090] Embodiment 2: A traction type engineering machine comprising the planetary gearbox for the traction type engineering machine in embodiment 1.

[0091] In some embodiments, the traction type engineering machine can be a bulldozer.

[0092] The above only describes the preferred embodiments of the application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A planetary gearbox, comprising an input shaft and an output shaft, characterized in that, The input shaft is provided with a first planetary gear set, a second planetary gear set, and a third planetary gear set arranged in parallel. The output shaft is provided with a fourth planetary gear set, a fifth planetary gear set, and a first clutch arranged in parallel. The first planetary gear set is provided with a reverse gear brake, the second planetary gear set is provided with a first forward gear brake, the third planetary gear set is provided with a second forward gear brake, the fourth planetary gear set is provided with a third gear brake, and the fifth planetary gear set is provided with a second gear brake. The first forward gear brake, the second forward gear brake, and the reverse gear brake are directional control clutches, and the first clutch, the second gear brake, and the third gear brake are gear control clutches. The first forward gear brake and the first clutch engage simultaneously to achieve forward gear 1; the second forward gear brake and the first clutch engage simultaneously to achieve forward gear 2; the first forward gear brake and the second gear position brake engage simultaneously to achieve forward gear 3; the second forward gear brake and the second gear position brake engage simultaneously to achieve forward gear 4; the first forward gear brake and the third gear position brake engage simultaneously to achieve forward gear 5; the second forward gear brake and the third gear position brake engage simultaneously to achieve forward gear 6; the reverse gear brake and the first clutch engage simultaneously to achieve reverse gear 1; the reverse gear brake and the second gear position brake engage simultaneously to achieve reverse gear 2; the reverse gear brake and the third gear position brake engage simultaneously to achieve reverse gear 3; and the gear ratio of the forward gear 1 is greater than 4.

2. The planetary gearbox according to claim 1, characterized in that, The first planetary gear set includes a first sun gear, a first planet carrier, first planet gears, and a first ring gear. The first planet gears are movably mounted on the first planet carrier. The first ring gear meshes with the first planet gears. The first planet gears mesh with the first sun gear. The first planet carrier is braked by the reverse gear brake. The second planetary gear set includes a second sun gear, a second planet carrier, second planet gears, and a second ring gear. The second planet gears are movably mounted on the second planet carrier. The second ring gear meshes with the second planet gears, and the second planet gears mesh with the second sun gear. The second ring gear is braked by the forward gear brake. The third planetary gear set includes a third sun gear, a third planet carrier, a third planet gear, and a third ring gear. The third planet gear is movably mounted on the third planet carrier. The third ring gear meshes with the third planet gear, and the third planet gear meshes with the third sun gear. The third ring gear is braked by a second forward gear brake. The first sun gear, the second sun gear, and the third sun gear are connected to the input shaft; the first ring gear is fixedly connected to the second planet carrier and the third planet carrier.

3. The planetary gearbox according to claim 2, characterized in that, The fourth planetary gear set includes a fourth sun gear, a fourth planet carrier, a fourth planet gear, and a fourth ring gear. The fourth planet gear is movably mounted on the fourth planet carrier. The fourth ring gear meshes with the fourth planet gear, and the fourth planet gear meshes with the fourth sun gear. The fourth ring gear is braked by a third gear brake. The fifth planetary gear set includes a fifth sun gear, a fifth planet carrier, fifth planet gears, and a fifth ring gear. The fifth planet gears are movably mounted on the fifth planet carrier. The fifth ring gear meshes with the fifth planet gears, and the fifth planet gears mesh with the fifth sun gear. The fifth ring gear is braked by a second gear brake. The inner hub of the first clutch is fixedly connected to the output shaft, and the outer hub of the first clutch is fixedly connected to the fifth gear ring. The fourth and fifth sun gears are fixedly connected to the output shaft; the third planet carrier is fixedly connected to the fourth planet carrier, and the fourth ring gear is fixedly connected to the fifth planet carrier.

4. The planetary gearbox according to claim 3, characterized in that, The first forward gear brake and the first clutch engage simultaneously, fixing the second ring gear and connecting the fifth ring gear and the output shaft as a whole. The second sun gear is connected to the input shaft via a spline, rotating in the same direction and at the same speed. In the second planetary gear set, the second sun gear inputs power. Because the second ring gear is fixed, the second planetary carrier and the fourth planetary carrier rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, and the fourth sun gear and the fourth ring gear output power. The fourth sun gear is connected to the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth planetary carrier inputs power. Because the first clutch is engaged, the fifth ring gear is connected to the output shaft as a whole, and the fifth sun gear and the fifth ring gear jointly output power. Finally, the power is output to the output shaft through the fourth sun gear, the fifth sun gear, and the fifth ring gear, achieving forward gear one.

5. The planetary gearbox according to claim 3, characterized in that, The second forward gear brake engages simultaneously with the first clutch, fixing the third ring gear and connecting the fifth ring gear and the output shaft as a whole. The third sun gear is connected to the input shaft via a spline, rotating in the same direction and at the same speed. In the third planetary gear set, the third sun gear inputs power. Because the third ring gear is fixed, the third and fourth planetary carriers rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, and the fourth sun gear and the fourth ring gear output power. The fourth sun gear is connected to the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth planetary carrier inputs power. Because the first clutch is engaged, the fifth ring gear is connected to the output shaft as a whole, and the fifth sun gear and the fifth ring gear jointly output power. Finally, the power is output to the output shaft through the fourth sun gear, the fifth sun gear, and the fifth ring gear, achieving the forward second gear.

6. The planetary gearbox according to claim 3, characterized in that, The first forward gear brake and the second gear brake engage simultaneously, fixing the second and fifth gear rings respectively. The second sun gear is connected to the input shaft via a spline and rotates in the same direction and at the same speed. In the second planetary gear set, the second sun gear inputs power. Since the second gear ring is fixed by the first forward gear brake, the second and fourth planetary carriers rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, and the fourth sun gear and the fourth gear ring output power. The fourth sun gear is connected to the output shaft, driving the output shaft to rotate. The fourth gear ring drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth ring gear is fixed, and the fifth sun gear outputs power; finally, the fourth and fifth sun gears work together to output power to the output shaft, achieving three forward gears.

7. The planetary gearbox according to claim 3, characterized in that, The second forward gear brake and the second gear position brake engage simultaneously, fixing the third and fifth gear rings respectively. The third sun gear is connected to the input shaft via a spline and rotates in the same direction and at the same speed. In the third planetary gear set, the third sun gear inputs power, and since the third gear ring is fixed, the third and fourth planetary carriers rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, and the fourth sun gear and the fourth gear ring output power. The fourth sun gear is connected to the output shaft, driving the output shaft to rotate, and the fourth gear ring drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth ring gear is fixed, and the fifth sun gear outputs power; finally, the fourth and fifth sun gears work together to output power to the output shaft, achieving four forward gears.

8. The planetary gearbox according to claim 3, characterized in that, The first forward gear brake and the third gear brake engage simultaneously, fixing the second and fourth gear rings respectively. The second sun gear is connected to the input shaft via a spline and rotates in the same direction and at the same speed. In the second planetary gear set, the second sun gear inputs power. Since the second gear ring is fixed, the second and fourth planetary carriers rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, the fourth gear ring is fixed, and the fourth sun gear outputs power to the output shaft, thus achieving five forward gears.

9. The planetary gearbox according to claim 3, characterized in that, The second forward gear brake and the third gear brake engage simultaneously, fixing the third and fourth gear rings respectively. The third sun gear is connected to the input shaft via a spline and rotates in the same direction and at the same speed. In the third planetary gear set, the third sun gear inputs power. Since the third gear ring is fixed, the third and fourth planetary carriers rotate in the same direction as the input shaft. In the fourth planetary gear set, the fourth planetary carrier inputs power, the fourth gear ring is fixed, and the fourth sun gear outputs power to the output shaft, achieving six forward gears.

10. The planetary gearbox according to claim 3, characterized in that, The reverse gear brake engages simultaneously with the first clutch, fixing the first planetary carrier and connecting the fifth ring gear and the output shaft as a whole. The first sun gear is connected to the input shaft via a spline, rotating in the same direction and at the same speed. In the first planetary gear set, the first sun gear inputs power. Due to the fixed first planetary carrier, the first ring gear rotates in the opposite direction to the first sun gear and outputs power, simultaneously driving the fourth planetary carrier to rotate. In the fourth planetary gear set, the fourth planetary carrier inputs power, the fourth sun gear and the fourth ring gear output power, the fourth sun gear is connected to the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth planetary carrier inputs power. Due to the engagement of the first clutch, the fifth ring gear is connected to the output shaft as a whole, and the fifth sun gear and the fifth ring gear jointly output power. Finally, the power is output to the output shaft via the fourth sun gear, the fifth sun gear, and the fifth ring gear, achieving a reverse gear shift.

11. The planetary gearbox according to claim 3, characterized in that, The reverse gear brake and the second gear brake engage simultaneously, fixing the first planetary carrier and the fifth ring gear respectively. The first sun gear is connected to the input shaft via a spline, rotating in the same direction and at the same speed. In the first planetary gear set, the first sun gear inputs power. Since the first planetary carrier is fixed by the reverse gear brake, the first ring gear rotates in the opposite direction to the first sun gear and outputs power, simultaneously driving the fourth planetary carrier to rotate. In the fourth planetary gear set, the fourth planetary carrier inputs power, and the fourth sun gear and the fourth ring gear output power. The fourth sun gear is connected to the output shaft, driving the output shaft to rotate, and the fourth ring gear drives the fifth planetary carrier to rotate. In the fifth planetary gear set, the fifth ring gear is fixed, and the fifth sun gear outputs power. Finally, the fourth and fifth sun gears jointly output power to the output shaft, achieving a two-gear reversal.

12. The planetary gearbox according to claim 3, characterized in that, The reverse gear brake and the third gear brake engage simultaneously, fixing the first planetary carrier and the fourth ring gear respectively. The first sun gear is connected to the input shaft via a spline and rotates in the same direction and at the same speed. In the first planetary gear set, the first sun gear inputs power. Since the first planetary carrier is fixed, the first ring gear rotates in the opposite direction to the first sun gear and outputs power, simultaneously driving the fourth planetary carrier to rotate. In the fourth planetary gear set, the fourth planetary carrier inputs power, the fourth ring gear is fixed, and the fourth sun gear outputs power to the output shaft, achieving a reverse gear of three.

13. The planetary gearbox according to claim 3, characterized in that, The input shaft, first sun gear, second sun gear, third sun gear, fourth sun gear, fifth sun gear and output shaft are arranged coaxially.

14. The planetary gearbox according to claim 3, characterized in that, The ratio of the number of teeth on the first gear ring to the number of teeth on the first sun gear is 2.529; The ratio of the number of teeth on the second ring gear to the number of teeth on the second sun gear is 3.276; The ratio of the number of teeth on the third ring gear to the number of teeth on the third sun gear is 2.143; The ratio of the number of teeth on the fourth ring gear to the number of teeth on the fourth sun gear is 2.143; The ratio of the number of teeth on the fifth ring gear to the number of teeth on the fifth sun gear is 1.

824.

15. The planetary gearbox according to claim 14, characterized in that, The gear ratio range for the first forward gear is 4.28, the gear ratio range for the second forward gear is 3.14, the gear ratio range for the third forward gear is 2.39, the gear ratio range for the fourth forward gear is 1.76, the gear ratio range for the fifth forward gear is 1.36, the gear ratio range for the sixth forward gear is 1.00, the gear ratio range for the first reverse gear is 2.53, the gear ratio range for the second reverse gear is 1.42, and the gear ratio range for the third reverse gear is 0.

8.

16. The planetary gearbox according to claim 15, characterized in that, The gear ratio between the first and second forward gears is 1.36; the gear ratio between the second and third forward gears is 1.31; the gear ratio between the third and fourth forward gears is 1.36; the gear ratio between the fourth and fifth forward gears is 1.29; the gear ratio between the fifth and sixth forward gears is 1.36; the gear ratio between the first and second reverse gears is 1.79; and the gear ratio between the second and third reverse gears is 1.

76.

17. The planetary gearbox according to any one of claims 1 to 16, characterized in that, The reverse gear brake, the first forward gear brake, the second forward gear brake, the third gear brake, the second gear brake, and the first clutch are all multi-plate friction-operated structures.

18. A traction-type engineering machinery, characterized in that, Includes the planetary gearbox as described in any one of claims 1 to 17.

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