Eight-gear automobile automatic transmission

Abstract

The invention belongs to the technical field of automatic transmissions and particularly relates to an eight-gear automobile automatic transmission. The transmission solves the technical problems that in the prior art, adjacent planetary gears interfere with one other, an obtained transmission ratio depends on a presumed transmission ratio, and the limitation of the transmission ratio of a system is large. The transmission comprises a box, a power input shaft, three clutches, four brakes and a planetary gear system. The planetary gear system comprises a first sun gear, a second sun gear, a third sun gear, a first gear ring, a second gear ring, a first planetary gear with a step, a first planetary gear without a step and a planetary frame. The second sun gear, the third sun gear and the planetary frame are controlled by the first clutch, the second clutch and the third clutch respectively. The second sun gear, the first sun gear, the planetary frame and the second gear ring are controlled by the first brake, the second brake, the third brake and the fourth brake respectively. The transmission is easy to control, transmission efficiency of all gears is high, and the adjacent planetary gears do not interfere with one other.

Description

technical field

[0001] The invention belongs to the technical field of automatic transmissions, in particular to an eight-speed automatic transmission for automobiles. Background technique

[0002] In 1940, Ravigneaux first proposed a planetary gear mechanism suitable for automatic transmissions of automobiles. It has a single planet carrier and there are two planetary gears adjacent to each other. This typical mechanism is called a Ravigneaux type planetary gear mechanism. In 2005, Taiwan Huang Wenmin published a paper for the first time to design a Ravigneaux-type six-speed automatic transmission, but it has not been practically used due to the interference of adjacent planetary gears. In 2009, Xu Zhenghe (Taiwan Patent Application No. 098113737 and Publication No. TW201038420) successfully developed a feasible Ravigneaux six-speed automatic transmission for the first time. Transmission ratios have significant limitations.

[0003] According to the previous technology an...

Examples

Embodiment 1

[0151] Embodiment 1 is the automobile automatic transmission 101 in the eight-speed automobile automatic transmission described in the present invention, which can be used as a transmission for front-mounted engine and front-wheel drive wheels.

[0152] Figure 1A It is a structural schematic diagram of an embodiment of an eight-speed automatic transmission for an automobile according to the present invention, an automatic transmission for an automobile 101; Wherein the planetary gear train 4 consists of the first sun gear 41, the third sun gear 42, the planet carrier 43, the first ring gear 44, the first planetary gear 45 without steps, the first planetary gear 46 with steps, The second ring gear 47, the second sun gear 48 are formed. The clutches 2 include a first group clutch 21 , a second group clutch 22 and a third group clutch 23 . The brakes 3 include a first group of brakes 31 , a second group of brakes 32 , a third group of brakes 33 and a fourth group of brakes 34 ....

Embodiment 2

[0183] The following describes another embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention. Since the parts in the following embodiments are substantially the same as those of the first embodiment and are assigned the same reference numerals, the detailed description thereof will be omitted.

[0184] Figure 2A It is a structural schematic diagram of the second embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention; Figure 2B It is a schematic diagram of the planetary gear train of the second embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention;

[0185] The meshing relationship of each gear in the planetary gear train 4 is respectively:

[0186] The first right-end gear 46B with stepped planetary gear meshes with the first sun gear 41, and the first left-end gear 46A with stepped planetary gear meshes with the second sun gear 48 and the first...

Embodiment 3

[0197] Figure 3A It is a structural schematic diagram of the third embodiment of the eight-speed automatic transmission for automobiles 103 of the present invention; Figure 3B It is a schematic diagram of the planetary gear train of the third embodiment of the eight-speed automatic transmission for automobiles 103 of the present invention;

[0198] and Figure 1A In comparison, only the first ring gear 44 is changed to mesh with the left end gear 46A of the planetary gear 46, and the rest remain unchanged.

[0199] The meshing relationship of each gear in the planetary gear train 4 is respectively:

[0200] The first right-end gear 46B with stepped planetary gear meshes with the first sun gear 41, and the first left-end gear 46A with stepped planetary gear meshes with the second sun gear 48 and the first non-stepped planetary gear 45 at the same time. meshing; the first non-stepped planetary gear 45 meshes with the third sun gear 42 and the first left-end gear 46A with ste...

technical field

[0001] The invention belongs to the technical field of automatic transmissions, in particular to an eight-speed automatic transmission for automobiles. Background technique

[0002] In 1940, Ravigneaux first proposed a planetary gear mechanism suitable for automatic transmissions of automobiles. It has a single planet carrier and there are two planetary gears adjacent to each other. This typical mechanism is called a Ravigneaux type planetary gear mechanism. In 2005, Taiwan Huang Wenmin published a paper for the first time to design a Ravigneaux-type six-speed automatic transmission, but it has not been practically used due to the interference of adjacent planetary gears. In 2009, Xu Zhenghe (Taiwan Patent Application No. 098113737 and Publication No. TW201038420) successfully developed a feasible Ravigneaux six-speed automatic transmission for the first time. Transmission ratios have significant limitations.

[0003] According to the previous technology an...

Examples

Embodiment 1

[0151] Embodiment 1 is the automobile automatic transmission 101 in the eight-speed automobile automatic transmission described in the present invention, which can be used as a transmission for front-mounted engine and front-wheel drive wheels.

[0152] Figure 1A It is a structural schematic diagram of an embodiment of an eight-speed automatic transmission for an automobile according to the present invention, an automatic transmission for an automobile 101; Wherein the planetary gear train 4 consists of the first sun gear 41, the third sun gear 42, the planet carrier 43, the first ring gear 44, the first planetary gear 45 without steps, the first planetary gear 46 with steps, The second ring gear 47, the second sun gear 48 are formed. The clutches 2 include a first group clutch 21 , a second group clutch 22 and a third group clutch 23 . The brakes 3 include a first group of brakes 31 , a second group of brakes 32 , a third group of brakes 33 and a fourth group of brakes 34 ....

Embodiment 2

[0183] The following describes another embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention. Since the parts in the following embodiments are substantially the same as those of the first embodiment and are assigned the same reference numerals, the detailed description thereof will be omitted.

[0184] Figure 2A It is a structural schematic diagram of the second embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention; Figure 2B It is a schematic diagram of the planetary gear train of the second embodiment of the eight-speed automatic transmission for automobiles 102 of the present invention;

[0185] The meshing relationship of each gear in the planetary gear train 4 is respectively:

[0186] The first right-end gear 46B with stepped planetary gear meshes with the first sun gear 41, and the first left-end gear 46A with stepped planetary gear meshes with the second sun gear 48 and the first...

Embodiment 3

[0197] Figure 3A It is a structural schematic diagram of the third embodiment of the eight-speed automatic transmission for automobiles 103 of the present invention; Figure 3B It is a schematic diagram of the planetary gear train of the third embodiment of the eight-speed automatic transmission for automobiles 103 of the present invention;

[0198] and Figure 1A In comparison, only the first ring gear 44 is changed to mesh with the left end gear 46A of the planetary gear 46, and the rest remain unchanged.

[0199] The meshing relationship of each gear in the planetary gear train 4 is respectively:

[0200] The first right-end gear 46B with stepped planetary gear meshes with the first sun gear 41, and the first left-end gear 46A with stepped planetary gear meshes with the second sun gear 48 and the first non-stepped planetary gear 45 at the same time. meshing; the first non-stepped planetary gear 45 meshes with the third sun gear 42 and the first left-end gear 46A with ste...

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