CS216351B1 - Multistage planet gearbox - Google Patents

Abstract

The invention solves the kinematic scheme of the planet gearbox, consisting of four simple ones planetary gears, three clutches and four brakes. The subject of the invention is a kinematic bond of single planetary parts gears among themselves, placing three clutches and four brakes. When using four simple planetary gears, three clutches and four brakes are achieved by seven forward and three reverse gears. Each gear is engaged by closing one clutch and one brake, optionally two couplings.

Description

The object of the invention is a multi-stage planetary gearbox for motor vehicles and construction machines, consisting of four simple planetary gears, three clutches and four brakes.

Existing six-speed planetary gearboxes use a kinetic scheme based on the basic (3 + 1) ° gearbox, which is preceded by a bisecting or range group. The disadvantage of such an arrangement is the simultaneous shifting of two clutches or brakes between some stages, which worsens the shifting of the shifting. Also, the possibility of choosing a more suitable gear ratio is more difficult.

The above drawbacks are overcome by the multi-stage planetary gear according to the invention, consisting of four single planetary gears, three clutches and four brakes, in which the output shaft is rigidly connected to the fourth gear carrier and the fourth gear sun gear is fixed to the forward gear shaft. The gearbox housing is connected by a fourth brake to a fourth gear ring gear.

By designing the transmission according to the invention, it is achieved that when shifting between any adjacent gears, only one shift member is engaged at a time, which contributes to the fullness of the shifting.

Fig. 1 is an example of a schematic circuit of the gearbox according to the invention; Fig. 2 is a shifting diagram.

The output shaft 5 is rigidly coupled to the fourth gear carrier D. The second gear carrier B is rigidly coupled to the crown gear of the first gear A and the crown gear of the third gear C. The third gear carrier C is firmly coupled to the crown gear of the second gear B and the fourth gear The forward gear clutch Si connects the input shaft 1 to the forward gear shaft 2, which is rigidly connected to the sun gear of the third gear C and to the sun gear of the fourth gear D. The overdrive clutch connects the input shaft 2 with the overdrive shaft 2 ». The reverse clutch S3 connects the input shaft with the reverse shaft 6, which is rigidly connected to the sun gear of the first gear A and the sun gear of the second gear B. The transmission housing 6 is connected by the first brake> 1 to the reverse shaft £, the second brake B2 with the first gear carrier A, t The third brake B3 with the first crown wheel gearing and a fourth brake B4 of the fourth ring gear gear D.

At 1 [deg.], The forward gear stage S1 and the fourth brake B4 are closed. the fourth gear D works as a simple planetary gear. The first gear A, the second gear B and the third gear C rotate freely without load.

At 11 ° the forward clutch S1 and the third brake B3 are engaged. The third gear C and the fourth gear D operate as a compound differential transmission. The first gear A and the second gear B rotate freely without load.

At 111 ° the forward clutch S1 and the second brake B2 are engaged. The first gear A, the second gear B, the third gear C and the fourth gear D work as a compound differential transmission.

At 1V ° the forward clutch S1 and the first brake B1 are engaged. The second gear B, the third gear C and the fourth gear D work as a compound differential transmission. The first part of the 351 A-track rotates freely without load.

At V ° the forward clutch S1 and the overdrive clutch S2 are engaged. The entire planetary part revolves as a whole.

At VI °, the overdrive clutch S2 and the first brake B1 are engaged. The second gear B, the third gear £ and the fourth gear D operate as a compound differential transmission. The first gearing A rotates freely without load.

At VII ° the overdrive clutch S2 and the second brake B2 are engaged. The first gear A, the second gear B, the third gear sou and the fourth gear D operate as a compound differential transmission.

At reverse RI °, reverse clutch S3 and fourth brake B4 are engaged. The second gear B, the third gear £ and the fourth gear D operate as a compound differential transmission. The first gearing A rotates freely without load.

In reverse gear ~ RII °, reverse clutch S3 and third brake B3 are engaged. The second gear B operates as a simple gear. The third gear 4 and the fourth gear D operate as a compound differential transmission. The first gearing A rotates freely without load.

At RIII ° the reverse clutch S3 and the second brake B2 are engaged. The first gear A, the second gear B, the third gear sou and the fourth gear D operate as a compound differential transmission.

When choosing planetary gear teeth:

gearing:

number of teeth of crown wheel number of teeth of sun gear

AND

(B)

103

C

103

D

103

IN

1.00

VI

0.71

VII

0.40, the following gears are achieved for each gear:

RIII RII R1 II II IV

-1.14 -2.48 -8.94 2.94 1.68 1.42 1.20

The number of operating modes as shown in Fig. 2 is maximum. Some achievable gears may not be used, for example VII °, RII °, RIII °.

Claims (1)

Multistage planetary gearbox for motor vehicles and construction machinery, consisting of four simple planetary gears, three clutches and four brakes, where the second gear carrier is rigidly connected to the first gear crown wheel and the third gear ring gear, the third gear carrier is firmly connected to the crown gear around the second gear, the forward clutch connects the input shaft to the forward shaft which is rigidly coupled to the third gear sun gear, the overdrive clutch connects the input shaft to the overdrive shaft that is rigidly coupled to the second gear carrier, the reverse clutch connects the input shaft to the shaft the gearbox is connected by the first brake to the reverse shaft, the second brake to the carrier of the first gear, the third brake to the gearbox. a gear wheel of the first gear, characterized in that the output shaft (5) is fixedly connected to the fourth gear (D), the carrier of the third gear (C) is firmly connected to the crown wheel of the fourth gear (D) and the sun gear of the fourth gear (D) the transmission housing (6) is connected by the fourth brake (B4) to the ring gear of the fourth gear (D). 1 drawing